{"id":79297,"date":"2026-03-01T17:41:20","date_gmt":"2026-03-01T09:41:20","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/79297.html"},"modified":"2026-03-01T17:41:20","modified_gmt":"2026-03-01T09:41:20","slug":"%e5%af%b9%e4%ba%8ec%ef%bc%9a%e5%a4%9a%e6%80%81%e7%9a%84%e8%a7%a3%e6%9e%90-%e4%b8%8a","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/79297.html","title":{"rendered":"\u5bf9\u4e8eC++\uff1a\u591a\u6001\u7684\u89e3\u6790\u2014\u4e0a"},"content":{"rendered":"<h2>\u5f00\u7bc7\u4ecb\u7ecd&#xff1a;<\/h2>\n<p>hello \u5927\u5bb6&#xff0c;\u6211\u4eec\u53c8\u89c1\u9762\u5566&#xff0c;very happy&#xff0c;\u54c8\u54c8&#xff0c;\u90a3\u4e48\u5927\u5bb6&#xff0c;\u6211\u4eec\u5728\u524d\u9762\u4e24\u7bc7\u535a\u5ba2\u4e2d&#xff0c;\u5b66\u4e60\u4e86C&#043;&#043;\u4e09\u5927\u7279\u6027\u4e4b\u4e00\u7684\u7ee7\u627f&#xff0c;\u90a3\u4e48\u65e2\u7136\u5b66\u4e60\u5b8c\u4e86\u7ee7\u627f&#xff0c;\u6211\u4eec\u63a5\u4e0b\u6765\u80af\u5b9a\u5c31\u5f97\u5b66\u4e60C&#043;&#043;\u4e09\u5927\u7279\u6027\u4e4b\u4e00\u7684\u591a\u6001&#xff0c;\u56e0\u4e3a\u591a\u6001\u6b63\u662f\u5efa\u7acb\u5728\u7ee7\u627f\u7684\u57fa\u7840\u4e4b\u4e0a\u7684&#xff0c;\u800c\u4e14\u5b83\u7684\u91cd\u8981\u6027\u4ee5\u53ca\u5b9e\u7528\u6027&#xff0c;\u90a3\u90fd\u662f\u6bcb\u5eb8\u7f6e\u7591\u7684\u9ad8&#xff0c;\u662f\u9762\u8bd5\u548c\u7b14\u8bd5\u4e2d\u7684\u9ad8\u9891\u8003\u70b9&#xff0c;\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u5c31\u8981\u7528\u4e24\u7bc7\u535a\u5ba2\u6765\u5c06\u591a\u6001\u7ed9\u201c\u5403\u5e72\u62b9\u51c0\u201d&#xff0c;\u54c8\u54c8\u3002<\/p>\n<p>\u5176\u5b9e\u5927\u5bb6\u4ed4\u7ec6\u3001\u8ba4\u771f\u7406\u89e3\u7684\u8bdd&#xff0c;\u591a\u6001\u5e76\u4e0d\u7b97\u7684\u4e0a\u662f\u591a\u96be&#xff0c;\u524d\u63d0\u662f\u5927\u5bb6\u5bf9\u7ee7\u627f\u8db3\u591f\u7684\u4e86\u89e3\u4ee5\u53ca\u6e05\u6670&#xff0c;OK&#xff0c;\u90a3\u4e48\u6211\u4eec\u8bdd\u4e0d\u591a\u8bf4&#xff0c;\u63a5\u4e0b\u6765\u5c31\u8fdb\u884c\u5bf9\u591a\u6001\u7684\u89e3\u6790\u4e4b\u540e\u3002<\/p>\n<h2>\u591a\u6001\u7684\u6982\u5ff5&#xff1a;<\/h2>\n<p>\u591a\u6001&#xff08;polymorphism&#xff09;\u7684\u901a\u4fd7\u6982\u5ff5\u662f 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\u201c\u51ed\u501f\u53c2\u6570\u5dee\u5f02\u5b9e\u73b0\u591a\u79cd\u5f62\u6001\u201d\u3002\u5177\u4f53\u6765\u8bf4&#xff0c;\u5f53\u6211\u4eec\u5b9a\u4e49\u591a\u4e2a\u540c\u540d\u51fd\u6570&#xff08;\u51fd\u6570\u91cd\u8f7d&#xff09;&#xff0c;\u6216\u4f7f\u7528\u6a21\u677f\u5b9a\u4e49\u901a\u7528\u51fd\u6570&#xff08;\u51fd\u6570\u6a21\u677f&#xff09;\u65f6&#xff0c;\u53ea\u9700\u4f20\u5165\u4e0d\u540c\u7c7b\u578b\u3001\u4e0d\u540c\u6570\u91cf\u6216\u4e0d\u540c\u987a\u5e8f\u7684\u53c2\u6570&#xff0c;\u7f16\u8bd1\u5668\u5c31\u80fd\u81ea\u52a8\u5339\u914d\u5230\u5bf9\u5e94\u7684\u51fd\u6570\u5b9e\u73b0\u3002\u4f8b\u5982\u51fd\u6570\u91cd\u8f7d\u4e2d&#xff0c;add(int a, int b) \u548c add(double a, double b) \u662f\u540c\u540d\u51fd\u6570&#xff0c;\u4f20\u5165\u6574\u578b\u53c2\u6570\u65f6\u8c03\u7528\u524d\u8005&#xff0c;\u4f20\u5165\u6d6e\u70b9\u578b\u53c2\u6570\u65f6\u8c03\u7528\u540e\u8005&#xff1b;\u51fd\u6570\u6a21\u677f template &lt;typename T&gt; T add(T a, T b) \u5219\u80fd\u901a\u8fc7\u4f20\u5165\u7684\u53c2\u6570\u7c7b\u578b&#xff0c;\u81ea\u52a8\u751f\u6210\u5bf9\u5e94\u7c7b\u578b\u7684\u51fd\u6570\u5b9e\u4f8b\u3002\u200b<\/p>\n<p>\u4e4b\u6240\u4ee5\u79f0\u4e3a \u201c\u7f16\u8bd1\u65f6\u591a\u6001\u201d \u6216 \u201c\u9759\u6001\u591a\u6001\u201d&#xff0c;\u662f\u56e0\u4e3a\u5b9e\u53c2\u4e0e\u5f62\u53c2\u7684\u5339\u914d\u8fc7\u7a0b\u3001\u51fd\u6570\u5730\u5740\u7684\u7ed1\u5b9a\u8fc7\u7a0b\u90fd\u5728\u7f16\u8bd1\u9636\u6bb5\u5b8c\u6210\u2014\u2014 \u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u5c31\u5df2\u786e\u5b9a\u8981\u8c03\u7528\u7684\u5177\u4f53\u51fd\u6570&#xff0c;\u540e\u7eed\u8fd0\u884c\u65f6\u65e0\u9700\u518d\u505a\u989d\u5916\u5224\u65ad&#xff0c;\u76f4\u63a5\u6267\u884c\u7f16\u8bd1\u597d\u7684\u6307\u4ee4\u5373\u53ef\u3002\u7531\u4e8e\u7f16\u8bd1\u662f\u7a0b\u5e8f\u8fd0\u884c\u524d\u7684\u9759\u6001\u64cd\u4f5c&#xff0c;\u8fd9\u7c7b\u591a\u6001\u56e0\u6b64\u5f97\u540d\u3002\u200b<\/p>\n<h3>\u4e8c\u3001\u8fd0\u884c\u65f6\u591a\u6001&#xff08;\u52a8\u6001\u591a\u6001&#xff09;\u200b<\/h3>\n<p>\u8fd0\u884c\u65f6\u591a\u6001\u7684\u6838\u5fc3\u8868\u73b0\u662f 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\u5f15\u7528\u5b9e\u9645\u6307\u5411\u7684\u662f\u57fa\u7c7b\u5bf9\u8c61\u8fd8\u662f\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff09;&#xff0c;\u53ea\u80fd\u5728\u8fd0\u884c\u65f6\u6839\u636e\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b&#xff0c;\u901a\u8fc7\u865a\u51fd\u6570\u8868\u6307\u9488\u627e\u5230\u5bf9\u5e94\u7684\u51fd\u6570\u5730\u5740&#xff0c;\u518d\u6267\u884c\u76f8\u5e94\u903b\u8f91&#xff0c;\u8fd9\u4e00\u52a8\u6001\u7ed1\u5b9a\u8fc7\u7a0b\u662f\u8fd0\u884c\u65f6\u591a\u6001\u7684\u6280\u672f\u6838\u5fc3&#xff0c;\u8fd9\u4e00\u6bb5\u8bdd\u5927\u5bb6\u5148\u770b\u770b&#xff0c;\u5230\u4e86\u6700\u540e\u7684\u65f6\u5019&#xff0c;\u6211\u4eec\u4f1a\u8fdb\u884c\u8be6\u7ec6\u7684\u89e3\u91ca\u3002<\/p>\n<p>OK\u5927\u5bb6&#xff0c;\u4ece\u4e0a\u9762\u7684\u4ecb\u7ecd\u5927\u5bb6\u5c31\u4e0d\u96be\u770b\u51fa&#xff0c;\u591a\u6001\u7edd\u5bf9\u662f\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u7279\u6027&#xff0c;\u6240\u4ee5\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591f\u8ba4\u771f\u5bf9\u5f85\u3002<\/p>\n<h2>\u591a\u6001\u7684\u5b9a\u4e49\u53ca\u5b9e\u73b0&#xff1a;<\/h2>\n<h3>\u591a\u6001\u7684\u6784\u6210\u6761\u4ef6&#xff1a;<\/h3>\n<p>\u5b9e\u73b0 C&#043;&#043; \u591a\u6001\u5fc5\u987b\u6ee1\u8db3\u4e24\u4e2a\u4e0d\u53ef\u7f3a\u5c11\u7684\u91cd\u8981\u6761\u4ef6&#xff0c;\u8fd9\u4e24\u4e2a\u6761\u4ef6\u5171\u540c\u652f\u6491 \u201c\u540c\u4e00\u884c\u4e3a\u5448\u73b0\u4e0d\u540c\u5f62\u6001\u201d \u7684\u6838\u5fc3\u6548\u679c&#xff0c;\u5177\u4f53\u7ec6\u8282\u5982\u4e0b&#xff1a;\u200b<\/p>\n<h4>\u4e00\u3001\u5fc5\u987b\u901a\u8fc7\u57fa\u7c7b\u7684\u6307\u9488\u6216\u5f15\u7528\u8c03\u7528\u865a\u51fd\u6570\u200b<\/h4>\n<p>\u8fd9\u4e00\u6761\u4ef6\u7684\u6838\u5fc3\u662f\u5229\u7528\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u7684 \u201c\u7c7b\u578b\u517c\u5bb9\u6027\u201d \u7279\u6027&#xff0c;\u4e3a\u591a\u6001\u7684 \u201c\u52a8\u6001\u7ed1\u5b9a\u201d \u63d0\u4f9b\u57fa\u7840&#xff0c;\u5177\u4f53\u53ef\u4ece\u4e09\u4e2a\u5c42\u9762\u7406\u89e3&#xff1a;\u200b<\/p>\n<p>1. \u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u7684\u7279\u6b8a\u80fd\u529b\u200b<\/p>\n<p>\u5728 C&#043;&#043; \u7ee7\u627f\u4f53\u7cfb\u4e2d&#xff0c;\u53ea\u6709\u57fa\u7c7b\u7684\u6307\u9488\u6216\u5f15\u7528\u5177\u5907 \u201c\u53cc\u91cd\u6307\u5411\u80fd\u529b\u201d\u2014\u2014 \u65e2\u80fd\u6307\u5411\u57fa\u7c7b\u81ea\u8eab\u7684\u5bf9\u8c61&#xff0c;\u4e5f\u80fd\u6307\u5411\u5176\u6d3e\u751f\u7c7b\u7684\u5bf9\u8c61&#xff08;\u8fd9\u662f\u5b50\u7c7b\u5bf9\u8c61\u53ef\u4ee5\u9690\u5f0f\u8f6c\u6362\u4e3a\u57fa\u7c7b\u7c7b\u578b\u7684\u4f53\u73b0&#xff09;\u3002\u4f8b\u5982\u5b9a\u4e49\u57fa\u7c7bPerson\u3001\u6d3e\u751f\u7c7bStudent\u540e&#xff0c;Person* p1 &#061; new Person();&#xff08;\u6307\u5411\u57fa\u7c7b\u5bf9\u8c61&#xff09;\u548cPerson* p2 &#061; new Student();&#xff08;\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff09;\u90fd\u662f\u5408\u6cd5\u7684&#xff1b;\u5f15\u7528\u540c\u7406&#xff0c;Person&amp; ref &#061; Student();\u4e5f\u80fd\u6b63\u5e38\u7f16\u8bd1\u3002\u200b<\/p>\n<p>\u800c\u5982\u679c\u7528\u6d3e\u751f\u7c7b\u7684\u6307\u9488 \/ \u5f15\u7528&#xff08;\u5982Student* p &#061; new Person();&#xff09;&#xff0c;\u5219\u4f1a\u76f4\u63a5\u7f16\u8bd1\u62a5\u9519 \u2014\u2014 \u56e0\u4e3a\u6d3e\u751f\u7c7b\u662f\u57fa\u7c7b\u7684 \u201c\u6269\u5c55\u201d&#xff0c;\u57fa\u7c7b\u5bf9\u8c61\u65e0\u6cd5\u6ee1\u8db3\u6d3e\u751f\u7c7b\u7684\u6240\u6709\u6210\u5458\u9700\u6c42&#xff0c;\u6240\u4ee5\u6d3e\u751f\u7c7b\u6307\u9488 \/ \u5f15\u7528\u4e0d\u80fd\u6307\u5411\u57fa\u7c7b\u5bf9\u8c61&#xff0c;\u81ea\u7136\u65e0\u6cd5\u5b9e\u73b0 \u201c\u540c\u4e00\u8c03\u7528\u65b9\u5f0f\u9002\u914d\u4e0d\u540c\u5bf9\u8c61\u201d \u7684\u591a\u6001\u573a\u666f\u3002\u200b<\/p>\n<p>2. \u4e0e \u201c\u5207\u7247\u201d \u673a\u5236\u7684\u5173\u8054\u200b<\/p>\n<p>\u8fd9\u4e00\u6761\u4ef6\u672c\u8d28\u662f\u5bf9\u7ee7\u627f\u4e2d \u201c\u5207\u7247\u201d \u673a\u5236\u7684\u5408\u7406\u5229\u7528&#xff1a;\u5f53\u6d3e\u751f\u7c7b\u5bf9\u8c61\u8d4b\u503c\u7ed9\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u65f6&#xff0c;\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u4f1a \u201c\u5207\u7247\u201d \u83b7\u53d6\u6d3e\u751f\u7c7b\u5bf9\u8c61\u4e2d\u7684\u57fa\u7c7b\u90e8\u5206&#xff0c;\u4f46\u4e0d\u4f1a\u4e22\u5931\u6d3e\u751f\u7c7b\u7684\u6838\u5fc3\u6807\u8bc6&#xff08;\u5373\u865a\u51fd\u6570\u8868\u6307\u9488\u6307\u5411\u7684\u4ecd\u662f\u6d3e\u751f\u7c7b\u7684\u865a\u8868&#xff09;\u3002\u6b63\u662f\u8fd9\u79cd \u201c\u5207\u7247\u4e0d\u4e22\u6807\u8bc6\u201d \u7684\u7279\u6027&#xff0c;\u624d\u80fd\u8ba9\u540e\u7eed\u8c03\u7528\u865a\u51fd\u6570\u65f6&#xff0c;\u51c6\u786e\u627e\u5230\u6d3e\u751f\u7c7b\u7684\u91cd\u5199\u5b9e\u73b0&#xff0c;\u800c\u975e\u4ec5\u6267\u884c\u57fa\u7c7b\u7684\u9ed8\u8ba4\u903b\u8f91\u3002\u200b<\/p>\n<p>3. \u5bf9\u5b9e\u9645\u7f16\u7a0b\u7684\u6697\u793a\u200b<\/p>\n<p><span style=\"color:#fe2c24\">\u8fd9\u4e00\u70b9\u76f4\u63a5\u6307\u5bfc\u4e86\u591a\u6001\u573a\u666f\u7684\u4ee3\u7801\u8bbe\u8ba1&#xff1a;<\/span><span style=\"color:#be191c\">\u5728\u5b9a\u4e49\u8c03\u7528\u865a\u51fd\u6570\u7684\u51fd\u6570\u65f6&#xff0c;\u5f62\u53c2\u7c7b\u578b\u5fc5\u987b\u8bbe\u4e3a\u57fa\u7c7b\u7684\u6307\u9488\u6216\u5f15\u7528&#xff0c;\u800c\u975e\u5b50\u7c7b\u7c7b\u578b\u3002<\/span><\/p>\n<p><span style=\"color:#fe2c24\">\u4f8b\u5982\u8981\u5b9e\u73b0 \u201c\u7edf\u4e00\u5904\u7406\u4e70\u7968\u884c\u4e3a\u201d \u7684\u51fd\u6570&#xff0c;\u5e94\u5b9a\u4e49\u4e3avoid handleBuyTicket(Person* person) { person-&gt;buyTicket(); }&#xff0c;\u800c\u975evoid handleBuyTicket(Student student) { &#8230; }\u2014\u2014 \u524d\u8005\u80fd\u63a5\u6536Person\u3001Student\u3001Soldier&#xff08;\u5176\u4ed6\u6d3e\u751f\u7c7b&#xff09;\u7b49\u591a\u79cd\u5bf9\u8c61&#xff0c;\u901a\u8fc7\u540c\u4e00\u51fd\u6570\u8c03\u7528\u89e6\u53d1\u4e0d\u540c\u7684\u4e70\u7968\u903b\u8f91&#xff1b;\u540e\u8005\u53ea\u80fd\u63a5\u6536Student\u5bf9\u8c61&#xff0c;\u65e0\u6cd5\u9002\u914d\u5176\u4ed6\u6d3e\u751f\u7c7b&#xff0c;\u5b8c\u5168\u5931\u53bb\u591a\u6001\u7684\u7075\u6d3b\u6027&#xff0c;\u8fd9\u4e5f\u662f\u540e\u7eed\u793a\u4f8b\u4f1a\u91cd\u70b9\u4f53\u73b0\u7684\u6838\u5fc3\u5dee\u5f02\u3002\u200b<\/span><\/p>\n<h4>\u4e8c\u3001\u88ab\u8c03\u7528\u7684\u51fd\u6570\u5fc5\u987b\u662f\u865a\u51fd\u6570&#xff0c;\u4e14\u6d3e\u751f\u7c7b\u9700\u5b8c\u6210\u91cd\u5199&#xff08;\u8986\u76d6&#xff09;\u200b<\/h4>\n<p>\u8fd9\u4e00\u6761\u4ef6\u662f\u5b9e\u73b0 \u201c\u4e0d\u540c\u5f62\u6001\u201d \u7684\u6838\u5fc3 \u2014\u2014 \u53ea\u6709\u8ba9\u57fa\u7c7b\u4e0e\u6d3e\u751f\u7c7b\u9488\u5bf9\u540c\u4e00\u51fd\u6570\u62e5\u6709\u4e0d\u540c\u5b9e\u73b0&#xff0c;\u624d\u80fd\u5728\u8c03\u7528\u65f6\u5448\u73b0\u5dee\u5f02&#xff0c;\u5177\u4f53\u7ec6\u8282\u5982\u4e0b&#xff1a;\u200b<\/p>\n<p>1. \u201c\u865a\u51fd\u6570\u201d \u7684\u5173\u952e\u4f5c\u7528\u200b<\/p>\n<p>\u51fd\u6570\u5fc5\u987b\u88abvirtual\u5173\u952e\u5b57\u4fee\u9970&#xff08;\u5373\u865a\u51fd\u6570&#xff09;&#xff0c;\u662f\u56e0\u4e3a\u865a\u51fd\u6570\u4f1a\u89e6\u53d1 C&#043;&#043; \u7684 \u201c\u865a\u51fd\u6570\u8868\u673a\u5236\u201d&#xff1a;\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u4f1a\u88ab\u8bb0\u5f55\u5728\u57fa\u7c7b\u7684\u865a\u8868\u4e2d&#xff0c;\u6d3e\u751f\u7c7b\u7ee7\u627f\u540e\u4f1a\u751f\u6210\u81ea\u5df1\u7684\u865a\u8868&#xff0c;\u82e5\u6d3e\u751f\u7c7b\u91cd\u5199\u865a\u51fd\u6570&#xff0c;\u4f1a\u5c06\u865a\u8868\u4e2d\u5bf9\u5e94\u4f4d\u7f6e\u7684\u57fa\u7c7b\u51fd\u6570\u5730\u5740 \u201c\u8986\u76d6\u201d \u4e3a\u81ea\u5df1\u7684\u51fd\u6570\u5730\u5740\u3002\u82e5\u51fd\u6570\u4e0d\u662f\u865a\u51fd\u6570&#xff0c;\u5219\u4e0d\u4f1a\u8fdb\u5165\u865a\u8868&#xff0c;\u8c03\u7528\u65f6\u4f1a\u76f4\u63a5\u6839\u636e\u6307\u9488 \/ \u5f15\u7528\u7684 \u201c\u9759\u6001\u7c7b\u578b\u201d&#xff08;\u5373\u7f16\u8bd1\u65f6\u7684\u7c7b\u578b&#xff09;\u7ed1\u5b9a\u51fd\u6570\u5730\u5740&#xff0c;\u65e0\u8bba\u6307\u5411\u54ea\u4e2a\u5bf9\u8c61&#xff0c;\u90fd\u53ea\u4f1a\u6267\u884c\u57fa\u7c7b\u7684\u51fd\u6570\u5b9e\u73b0&#xff0c;\u5b8c\u5168\u65e0\u6cd5\u89e6\u53d1\u591a\u6001\u3002\u200b<\/p>\n<p>2. \u201c\u91cd\u5199\u201d \u7684\u4e25\u683c\u5b9a\u4e49&#xff08;\u4e0e\u91cd\u8f7d\u533a\u5206&#xff09;\u200b<\/p>\n<p>\u8fd9\u91cc\u5fc5\u987b\u660e\u786e&#xff1a;\u201c\u91cd\u5199\u201d&#xff08;\u8986\u76d6&#xff09;\u2260\u201c\u91cd\u8f7d\u201d&#xff0c;\u4e8c\u8005\u662f\u5b8c\u5168\u4e0d\u540c\u7684\u6982\u5ff5&#xff0c;\u9519\u8bef\u6df7\u6dc6\u4f1a\u76f4\u63a5\u5bfc\u81f4\u591a\u6001\u5931\u6548\u3002\u200b<\/p>\n<ul>\n<li>\u91cd\u5199&#xff1a;\u8981\u6c42\u57fa\u7c7b\u4e0e\u6d3e\u751f\u7c7b\u7684\u51fd\u6570\u6ee1\u8db3 \u201c\u4e09\u540c\u201d&#xff08;\u51fd\u6570\u540d\u3001\u53c2\u6570\u5217\u8868\u3001\u8fd4\u56de\u503c\u7c7b\u578b\u5b8c\u5168\u4e00\u81f4&#xff0c;\u534f\u53d8\u573a\u666f\u9664\u5916&#xff09;&#xff0c;\u4e14\u57fa\u7c7b\u51fd\u6570\u4e3a\u865a\u51fd\u6570&#xff0c;\u6d3e\u751f\u7c7b\u51fd\u6570\u53ef\u52a0virtual&#xff08;\u4e5f\u53ef\u7701\u7565&#xff0c;\u56e0\u7ee7\u627f\u4f1a\u4fdd\u7559\u865a\u5c5e\u6027&#xff09;&#xff1b;\u91cd\u5199\u7684\u76ee\u7684\u662f \u201c\u66ff\u6362\u201d \u57fa\u7c7b\u51fd\u6570\u7684\u5b9e\u73b0&#xff0c;\u8ba9\u6d3e\u751f\u7c7b\u62e5\u6709\u4e13\u5c5e\u903b\u8f91&#xff0c;\u4f8b\u5982Person\u7684buyTicket()&#xff08;\u5168\u4ef7&#xff09;\u548cStudent\u7684buyTicket()&#xff08;\u4f18\u60e0&#xff09;\u5c31\u662f\u5178\u578b\u91cd\u5199\u3002\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u91cd\u8f7d&#xff1a;\u662f\u540c\u4e00\u4f5c\u7528\u57df\u5185&#xff08;\u5982\u540c\u4e00\u7c7b\u4e2d&#xff09;\u7684\u540c\u540d\u51fd\u6570&#xff0c;\u901a\u8fc7\u53c2\u6570\u7684 \u201c\u7c7b\u578b\u3001\u6570\u91cf\u3001\u987a\u5e8f\u201d \u4e0d\u540c\u533a\u5206&#xff0c;\u4e0evirtual\u65e0\u5173&#xff0c;\u4f8b\u5982Person\u7c7b\u4e2dshowInfo()\u548cshowInfo(int age)\u5c31\u662f\u91cd\u8f7d&#xff1b;\u91cd\u8f7d\u4ec5\u4f5c\u7528\u4e8e\u540c\u4e00\u7c7b\u5185\u90e8&#xff0c;\u65e0\u6cd5\u8de8\u7ee7\u627f\u4f53\u7cfb\u5b9e\u73b0\u591a\u6001\u7684 \u201c\u4e0d\u540c\u5bf9\u8c61\u4e0d\u540c\u884c\u4e3a\u201d\u3002\u200b<\/li>\n<\/ul>\n<p>\u53ea\u6709\u5f53\u6d3e\u751f\u7c7b\u4e25\u683c\u6309\u7167\u91cd\u5199\u89c4\u5219&#xff0c;\u5bf9\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u63d0\u4f9b\u65b0\u7684\u5b9e\u73b0&#xff08;\u5373\u5b8c\u6210\u91cd\u5199&#xff09;&#xff0c;\u57fa\u7c7b\u4e0e\u6d3e\u751f\u7c7b\u4e4b\u95f4\u624d\u4f1a\u5f62\u6210 \u201c\u540c\u4e00\u51fd\u6570\u540d\u3001\u4e0d\u540c\u5b9e\u73b0\u201d \u7684\u5bf9\u5e94\u5173\u7cfb\u3002\u6b64\u65f6\u8c03\u7528\u865a\u51fd\u6570\u65f6&#xff0c;\u624d\u80fd\u6839\u636e\u5bf9\u8c61\u7684 \u201c\u52a8\u6001\u7c7b\u578b\u201d&#xff08;\u5373\u8fd0\u884c\u65f6\u5b9e\u9645\u6307\u5411\u7684\u5bf9\u8c61\u7c7b\u578b&#xff09;&#xff0c;\u4ece\u865a\u8868\u4e2d\u627e\u5230\u5bf9\u5e94\u7684\u51fd\u6570\u5730\u5740&#xff0c;\u6267\u884c\u6d3e\u751f\u7c7b\u7684\u91cd\u5199\u903b\u8f91 \u2014\u2014 \u82e5\u6d3e\u751f\u7c7b\u672a\u91cd\u5199&#xff0c;\u5219\u4f1a\u7ee7\u627f\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u5b9e\u73b0&#xff0c;\u6b64\u65f6\u8c03\u7528\u4ecd\u6267\u884c\u57fa\u7c7b\u903b\u8f91&#xff0c;\u65e0\u6cd5\u5448\u73b0\u591a\u6001\u7684 \u201c\u4e0d\u540c\u5f62\u6001\u201d&#xff0c;\u751a\u81f3\u82e5\u57fa\u7c7b\u865a\u51fd\u6570\u4e3a\u7eaf\u865a\u51fd\u6570&#xff0c;\u6d3e\u751f\u7c7b\u672a\u91cd\u5199\u4f1a\u5bfc\u81f4\u81ea\u8eab\u6210\u4e3a\u62bd\u8c61\u7c7b&#xff0c;\u65e0\u6cd5\u5b9e\u4f8b\u5316\u3002<\/p>\n<p>OK\u5927\u5bb6&#xff0c;\u5149\u770b\u4e0a\u9762\u5927\u5bb6\u53ef\u80fd\u8fd8\u662f\u6709\u70b9\u8499&#xff0c;\u4e0b\u9762\u6211\u4eec\u5bf9\u865a\u51fd\u6570\u4ee5\u53ca\u91cd\u5199\u8fdb\u884c\u8be6\u7ec6\u7684\u89e3\u6790\u3002<\/p>\n<h3>\u865a\u51fd\u6570&#xff1a;<\/h3>\n<p>\u5728 C&#043;&#043; \u4e2d&#xff0c;\u865a\u51fd\u6570\u662f\u5b9e\u73b0\u8fd0\u884c\u65f6\u591a\u6001\u7684\u6838\u5fc3\u8f7d\u4f53&#xff0c;\u5176\u5b9a\u4e49\u3001\u7279\u6027\u53ca\u7ea6\u675f\u9700\u8981\u7cbe\u51c6\u7406\u89e3&#xff0c;\u5177\u4f53\u7ec6\u8282\u5982\u4e0b&#xff1a;\u200b<\/p>\n<h4>\u4e00\u3001\u865a\u51fd\u6570\u7684\u57fa\u672c\u5b9a\u4e49\u4e0e\u8bed\u6cd5\u200b<\/h4>\n<p><span style=\"color:#fe2c24\">\u865a\u51fd\u6570\u7684\u6838\u5fc3\u6807\u8bc6\u662fvirtual\u5173\u952e\u5b57&#xff0c;\u5176\u8bed\u6cd5\u89c4\u5219\u660e\u786e&#xff1a;\u4ec5\u5f53\u7c7b\u7684\u6210\u5458\u51fd\u6570\u524d&#xff08;\u5373\u51fd\u6570\u8fd4\u56de\u7c7b\u578b\u524d\u9762&#xff09;\u6dfb\u52a0virtual\u5173\u952e\u5b57\u4fee\u9970\u65f6&#xff0c;\u8be5\u6210\u5458\u51fd\u6570\u624d\u88ab\u79f0\u4e3a\u865a\u51fd\u6570\u3002\u200b<\/span><\/p>\n<p>1. \u8bed\u6cd5\u793a\u4f8b\u200b<\/p>\n<p>\u4ee5\u4e4b\u524d \u201c\u4e70\u7968\u201d \u573a\u666f\u4e2d\u7684buyTicket\u51fd\u6570\u4e3a\u4f8b&#xff0c;\u57fa\u7c7bPerson\u4e2d\u5b9a\u4e49\u865a\u51fd\u6570\u7684\u6b63\u786e\u5199\u6cd5\u4e3a&#xff1a;\u200b<\/p>\n<p>class Person {<br \/>\npublic:<br \/>\n    \/\/ \u6210\u5458\u51fd\u6570\u524d\u52a0virtual&#xff0c;\u6210\u4e3a\u865a\u51fd\u6570<br \/>\n    virtual void buyTicket() {<br \/>\n        cout &lt;&lt; &#034;\u666e\u901a\u4eba\u4e70\u7968&#xff1a;\u5168\u4ef7&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>\u6d3e\u751f\u7c7bStudent\u7ee7\u627f\u540e\u91cd\u5199\u8be5\u865a\u51fd\u6570\u65f6&#xff0c;virtual\u5173\u952e\u5b57\u53ef\u52a0\u53ef\u4e0d\u52a0&#xff08;\u56e0\u7ee7\u627f\u4f1a\u4fdd\u7559\u51fd\u6570\u7684\u865a\u5c5e\u6027&#xff09;&#xff0c;\u4f46\u4e3a\u4e86\u4ee3\u7801\u53ef\u8bfb\u6027&#xff0c;\u901a\u5e38\u5efa\u8bae\u663e\u5f0f\u6dfb\u52a0&#xff1a;\u200b<\/p>\n<p>class Student : public Person {<br \/>\npublic:<br \/>\n    \/\/ \u6d3e\u751f\u7c7b\u91cd\u5199\u865a\u51fd\u6570&#xff0c;virtual\u53ef\u7701\u7565\u4f46\u5efa\u8bae\u4fdd\u7559<br \/>\n    virtual void buyTicket() override {<br \/>\n        cout &lt;&lt; &#034;\u5b66\u751f\u4e70\u7968&#xff1a;75\u6298\u4f18\u60e0&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>2. \u8bed\u6cd5\u4f4d\u7f6e\u7684\u4e25\u683c\u6027\u200b<\/p>\n<p>\u9700\u7279\u522b\u6ce8\u610fvirtual\u7684\u4fee\u9970\u4f4d\u7f6e&#xff1a;\u5fc5\u987b\u653e\u5728 \u201c\u51fd\u6570\u8fd4\u56de\u7c7b\u578b\u524d\u9762\u201d&#xff0c;\u4e14\u4ec5\u80fd\u4fee\u9970\u7c7b\u7684\u6210\u5458\u51fd\u6570\u3002\u4f8b\u5982\u4ee5\u4e0b\u4e24\u79cd\u5199\u6cd5\u5747\u4e0d\u5408\u6cd5&#xff1a;\u200b<\/p>\n<ul>\n<li>\u9519\u8bef 1&#xff1a;void virtual buyTicket()\u2014\u2014virtual\u4f4d\u7f6e\u9519\u8bef&#xff0c;\u867d\u90e8\u5206\u7f16\u8bd1\u5668\u53ef\u80fd\u517c\u5bb9&#xff0c;\u4f46\u4e0d\u7b26\u5408\u6807\u51c6\u8bed\u6cd5\u89c4\u8303&#xff0c;\u6613\u5bfc\u81f4\u4ee3\u7801\u53ef\u8bfb\u6027\u6df7\u4e71&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u9519\u8bef 2&#xff1a;\u5728\u5168\u5c40\u51fd\u6570\u6216\u9759\u6001\u6210\u5458\u51fd\u6570\u524d\u52a0virtual&#xff0c;\u5982virtual void globalFunc()&#xff08;\u5168\u5c40\u51fd\u6570&#xff09;\u3001static virtual void staticFunc()&#xff08;\u9759\u6001\u6210\u5458\u51fd\u6570&#xff09;\u2014\u2014 \u524d\u8005\u56e0 \u201c\u975e\u6210\u5458\u51fd\u6570\u201d \u65e0\u6cd5\u88abvirtual\u4fee\u9970&#xff0c;\u540e\u8005\u56e0\u9759\u6001\u6210\u5458\u51fd\u6570\u5c5e\u4e8e\u7c7b\u800c\u975e\u5bf9\u8c61&#xff0c;\u65e0\u865a\u51fd\u6570\u8868\u6307\u9488\u5173\u8054&#xff0c;\u5747\u4f1a\u76f4\u63a5\u7f16\u8bd1\u62a5\u9519\u3002\u200b<\/li>\n<\/ul>\n<h4>\u4e8c\u3001\u865a\u51fd\u6570\u7684\u5173\u952e\u7ea6\u675f&#xff1a;\u975e\u6210\u5458\u51fd\u6570\u4e0d\u53ef\u4fee\u9970\u200b<\/h4>\n<p>\u201c\u975e\u6210\u5458\u51fd\u6570\u4e0d\u80fd\u4f7f\u7528virtual\u5173\u952e\u5b57\u4fee\u9970\u201d \u662f C&#043;&#043; \u7684\u786c\u6027\u8bed\u6cd5\u89c4\u5219&#xff0c;\u80cc\u540e\u6709\u660e\u786e\u7684\u8bbe\u8ba1\u903b\u8f91&#xff1a;\u200b<\/p>\n<p>1. \u975e\u6210\u5458\u51fd\u6570\u7684\u672c\u8d28\u9650\u5236\u200b<\/p>\n<p>\u975e\u6210\u5458\u51fd\u6570&#xff08;\u5982\u5168\u5c40\u51fd\u6570\u3001\u53cb\u5143\u51fd\u6570&#xff09;\u4e0d\u96b6\u5c5e\u4e8e\u4efb\u4f55\u7c7b&#xff0c;\u4e5f\u4e0d\u4e0e\u5177\u4f53\u5bf9\u8c61\u7ed1\u5b9a \u2014\u2014 \u5168\u5c40\u51fd\u6570\u72ec\u7acb\u4e8e\u6240\u6709\u7c7b&#xff0c;\u53cb\u5143\u51fd\u6570\u867d\u80fd\u8bbf\u95ee\u7c7b\u7684\u79c1\u6709\u6210\u5458&#xff0c;\u4f46\u672c\u8d28\u4ecd\u662f\u5916\u90e8\u51fd\u6570&#xff0c;\u4e0d\u5177\u5907 \u201c\u7c7b\u6210\u5458\u51fd\u6570\u201d \u7684\u5c5e\u6027\u3002\u800c\u865a\u51fd\u6570\u7684\u6838\u5fc3\u4f5c\u7528\u662f \u201c\u901a\u8fc7\u5bf9\u8c61\u7684\u865a\u51fd\u6570\u8868\u6307\u9488&#xff0c;\u5728\u8fd0\u884c\u65f6\u627e\u5230\u5bf9\u5e94\u7c7b\u7684\u51fd\u6570\u5b9e\u73b0\u201d&#xff0c;\u8fd9\u9700\u8981\u51fd\u6570\u4e0e\u7c7b\u3001\u5bf9\u8c61\u5f3a\u5173\u8054&#xff08;\u4f9d\u8d56\u7c7b\u7684\u865a\u8868\u673a\u5236&#xff09;&#xff0c;\u975e\u6210\u5458\u51fd\u6570\u65e0\u6b64\u5173\u8054\u57fa\u7840&#xff0c;\u81ea\u7136\u65e0\u6cd5\u88abvirtual\u4fee\u9970\u3002\u200b<\/p>\n<p>2. \u5e38\u89c1\u975e\u6210\u5458\u51fd\u6570\u7684\u6392\u9664\u573a\u666f\u200b<\/p>\n<ul>\n<li>\u5168\u5c40\u51fd\u6570&#xff1a;\u5982void printInfo()&#xff0c;\u5b8c\u5168\u72ec\u7acb\u4e8e\u7c7b&#xff0c;\u52a0virtual\u4f1a\u7f16\u8bd1\u62a5\u9519&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u53cb\u5143\u51fd\u6570&#xff1a;\u5373\u4fbf\u5728\u7c7b\u5185\u58f0\u660efriend virtual void show(Person&amp; p)&#xff0c;\u4e5f\u4f1a\u56e0 \u201c\u53cb\u5143\u4e0d\u662f\u6210\u5458\u51fd\u6570\u201d \u88ab\u7f16\u8bd1\u5668\u62d2\u7edd&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u9759\u6001\u6210\u5458\u51fd\u6570&#xff1a;\u867d\u5c5e\u4e8e\u7c7b&#xff0c;\u4f46\u4e0d\u4f9d\u8d56\u5bf9\u8c61\u5b9e\u4f8b&#xff08;\u65e0this\u6307\u9488&#xff09;&#xff0c;\u800c\u865a\u51fd\u6570\u8c03\u7528\u9700\u901a\u8fc7this\u6307\u9488\u8bbf\u95ee\u5bf9\u8c61\u7684\u865a\u51fd\u6570\u8868\u6307\u9488&#xff0c;\u56e0\u6b64\u9759\u6001\u6210\u5458\u51fd\u6570\u4e5f\u4e0d\u80fd\u52a0virtual&#xff08;\u7f16\u8bd1\u65f6\u4f1a\u63d0\u793a \u201c\u9759\u6001\u6210\u5458\u51fd\u6570\u4e0d\u80fd\u662f\u865a\u51fd\u6570\u201d&#xff09;\u3002<\/li>\n<\/ul>\n<h4>\u4e09\u3001\u865a\u51fd\u6570\u7684\u5e38\u89c1\u8ba4\u77e5\u8bef\u533a\u200b<\/h4>\n<p>1. \u6d3e\u751f\u7c7b\u91cd\u5199\u65f6\u5fc5\u987b\u52a0virtual&#xff1f;\u200b<\/p>\n<p>\u4e0d\u5fc5\u3002\u6d3e\u751f\u7c7b\u91cd\u5199\u57fa\u7c7b\u865a\u51fd\u6570\u65f6&#xff0c;virtual\u5173\u952e\u5b57\u53ef\u7701\u7565&#xff0c;\u56e0\u57fa\u7c7b\u5df2\u6807\u8bb0\u8be5\u51fd\u6570\u4e3a\u865a\u51fd\u6570&#xff0c;\u6d3e\u751f\u7c7b\u7ee7\u627f\u540e\u4f1a\u81ea\u52a8\u4fdd\u7559\u5176\u865a\u5c5e\u6027\u3002\u4f46\u4e3a\u4e86\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u4e25\u8c28\u6027&#xff08;\u907f\u514d\u540e\u7eed\u7ef4\u62a4\u65f6\u8bef\u5224\u51fd\u6570\u662f\u5426\u4e3a\u865a\u51fd\u6570&#xff09;&#xff0c;\u5efa\u8bae\u663e\u5f0f\u6dfb\u52a0virtual&#xff0c;\u6216\u7ed3\u5408 C&#043;&#043;11 \u7684override\u5173\u952e\u5b57&#xff08;\u5982void buyTicket() override&#xff09;&#xff0c;\u65e2\u80fd\u660e\u786e\u91cd\u5199\u610f\u56fe&#xff0c;\u53c8\u80fd\u8ba9\u7f16\u8bd1\u5668\u68c0\u67e5\u91cd\u5199\u662f\u5426\u6b63\u786e\u3002\u200b<\/p>\n<p>2. virtual\u4fee\u9970\u540e\u51fd\u6570\u5c31\u4e00\u5b9a\u80fd\u89e6\u53d1\u591a\u6001&#xff1f;\u200b<\/p>\n<p>\u4e0d\u4e00\u5b9a\u3002\u865a\u51fd\u6570\u53ea\u662f\u591a\u6001\u7684 \u201c\u524d\u63d0\u4e4b\u4e00\u201d&#xff0c;\u8fd8\u9700\u6ee1\u8db3 \u201c\u901a\u8fc7\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u8c03\u7528\u201d \u8fd9\u4e00\u6761\u4ef6\u3002\u82e5\u76f4\u63a5\u7528\u5bf9\u8c61\u8c03\u7528\u865a\u51fd\u6570&#xff08;\u5982Person p; p.buyTicket(); Student s; s.buyTicket();&#xff09;&#xff0c;\u867d\u51fd\u6570\u662f\u865a\u51fd\u6570&#xff0c;\u4f46\u8c03\u7528\u65f6\u4f1a\u6839\u636e\u5bf9\u8c61\u7684 \u201c\u9759\u6001\u7c7b\u578b\u201d \u76f4\u63a5\u7ed1\u5b9a&#xff08;\u7f16\u8bd1\u65f6\u786e\u5b9a\u5730\u5740&#xff09;&#xff0c;\u65e0\u6cd5\u89e6\u53d1\u591a\u6001&#xff1b;\u53ea\u6709\u7528Person* p &#061; new Student(); p-&gt;buyTicket();\u8fd9\u7c7b\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u8c03\u7528&#xff0c;\u624d\u80fd\u89e6\u53d1\u52a8\u6001\u7ed1\u5b9a&#xff0c;\u5b9e\u73b0\u591a\u6001\u3002<\/p>\n<h3>\u865a\u51fd\u6570\u7684\u91cd\u5199\/\u8986\u76d6&#xff1a;<\/h3>\n<p>\u5728 C&#043;&#043; \u8fd0\u884c\u65f6\u591a\u6001\u4e2d&#xff0c;\u865a\u51fd\u6570\u7684\u91cd\u5199&#xff08;\u53c8\u79f0\u8986\u76d6&#xff09;\u662f\u5b9e\u73b0 \u201c\u4e0d\u540c\u5bf9\u8c61\u8c03\u7528\u540c\u4e00\u51fd\u6570\u5448\u73b0\u4e0d\u540c\u884c\u4e3a\u201d \u7684\u6838\u5fc3\u64cd\u4f5c&#xff0c;\u5176\u89c4\u5219\u9700\u4e25\u683c\u9075\u5faa \u201c\u4e09\u540c\u201d \u8981\u6c42&#xff0c;\u5177\u4f53\u7ec6\u8282\u53ca\u6613\u9519\u70b9\u5982\u4e0b&#xff1a;\u200b<\/p>\n<h4>\u4e00\u3001\u865a\u51fd\u6570\u91cd\u5199\u7684\u6838\u5fc3\u5b9a\u4e49&#xff1a;\u4ec0\u4e48\u662f \u201c\u91cd\u5199 \/ \u8986\u76d6\u201d\u200b<\/h4>\n<p>\u865a\u51fd\u6570\u7684\u91cd\u5199&#xff08;\u6216\u8986\u76d6&#xff09;&#xff0c;\u672c\u8d28\u662f\u6d3e\u751f\u7c7b\u9488\u5bf9\u57fa\u7c7b\u5df2\u58f0\u660e\u7684\u865a\u51fd\u6570&#xff0c;\u63d0\u4f9b\u4e00\u4e2a \u201c\u5b8c\u5168\u5339\u914d\u201d \u7684\u51fd\u6570\u5b9e\u73b0\u2014\u2014 \u5373\u6d3e\u751f\u7c7b\u4e2d\u5b58\u5728\u4e00\u4e2a\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u6ee1\u8db3 \u201c\u4e09\u540c\u201d \u6761\u4ef6\u7684\u51fd\u6570&#xff0c;\u6b64\u65f6\u6d3e\u751f\u7c7b\u7684\u8be5\u51fd\u6570\u4f1a \u201c\u8986\u76d6\u201d \u57fa\u7c7b\u865a\u51fd\u6570\u5728\u865a\u8868\u4e2d\u7684\u5730\u5740&#xff0c;\u540e\u7eed\u901a\u8fc7\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u8c03\u7528\u65f6&#xff0c;\u4f1a\u4f18\u5148\u6267\u884c\u6d3e\u751f\u7c7b\u7684\u91cd\u5199\u5b9e\u73b0\u3002\u200b<\/p>\n<p>\u9700\u660e\u786e&#xff1a;\u91cd\u5199\u7684\u6838\u5fc3\u662f \u201c\u51fd\u6570\u63a5\u53e3\u5339\u914d &#043; \u865a\u51fd\u6570\u5c5e\u6027\u201d&#xff0c;\u4e0e\u51fd\u6570\u4f53\u5185\u90e8\u903b\u8f91\u65e0\u5173 \u2014\u2014 \u57fa\u7c7b\u548c\u6d3e\u751f\u7c7b\u7684\u51fd\u6570\u4f53\u53ef\u5b8c\u5168\u4e0d\u540c&#xff08;\u8fd9\u6b63\u662f\u591a\u6001 \u201c\u4e0d\u540c\u884c\u4e3a\u201d \u7684\u6765\u6e90&#xff09;&#xff0c;\u4f46\u5fc5\u987b\u6ee1\u8db3 \u201c\u4e09\u540c\u201d \u7684\u63a5\u53e3\u7ea6\u675f\u3002\u200b<\/p>\n<h4>\u4e8c\u3001\u91cd\u5199\u7684\u6838\u5fc3\u89c4\u5219&#xff1a;\u4e25\u683c\u7684 \u201c\u4e09\u540c\u201d \u8981\u6c42\u200b<\/h4>\n<p>\u201c\u4e09\u540c\u201d \u6307\u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u7684 \u201c\u8fd4\u56de\u503c\u7c7b\u578b\u3001\u51fd\u6570\u540d\u5b57\u3001\u53c2\u6570\u5217\u8868\u201d \u5b8c\u5168\u76f8\u540c&#xff0c;\u4e09\u8005\u7f3a\u4e00\u4e0d\u53ef&#xff0c;\u4efb\u4f55\u4e00\u9879\u4e0d\u5339\u914d\u90fd\u4f1a\u5bfc\u81f4\u91cd\u5199\u5931\u8d25&#xff0c;\u6ca6\u4e3a\u666e\u901a\u7684\u6d3e\u751f\u7c7b\u65b0\u589e\u51fd\u6570&#xff08;\u65e0\u6cd5\u89e6\u53d1\u591a\u6001&#xff09;&#xff0c;\u5177\u4f53\u62c6\u89e3\u5982\u4e0b&#xff1a;\u200b<\/p>\n<p>1. <span style=\"color:#fe2c24\">\u7b2c\u4e00\u540c&#xff1a;\u51fd\u6570\u540d\u5b57\u5b8c\u5168\u76f8\u540c\u200b<\/span><\/p>\n<ul>\n<li>\u8981\u6c42&#xff1a;\u57fa\u7c7b\u4e0e\u6d3e\u751f\u7c7b\u7684\u51fd\u6570\u540d\u5fc5\u987b\u4e00\u5b57\u4e0d\u5dee&#xff0c;\u5927\u5c0f\u5199\u3001\u62fc\u5199\u5747\u9700\u4e00\u81f4&#xff0c;\u4e0d\u5b58\u5728 \u201c\u8fd1\u4f3c\u5339\u914d\u201d \u6216 \u201c\u6a21\u7cca\u5339\u914d\u201d\u3002\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u793a\u4f8b&#xff1a;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u57fa\u7c7b\u865a\u51fd\u6570&#xff1a;virtual void buyTicket()\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u6d3e\u751f\u7c7b\u6b63\u786e\u91cd\u5199&#xff1a;virtual void buyTicket()&#xff08;\u51fd\u6570\u540d\u5b8c\u5168\u4e00\u81f4&#xff09;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u6d3e\u751f\u7c7b\u9519\u8bef\u5199\u6cd5&#xff1a;virtual void buy_ticket()&#xff08;\u4e0b\u5212\u7ebf\u5dee\u5f02&#xff09;\u3001virtual void BuyTicket()&#xff08;\u5927\u5c0f\u5199\u5dee\u5f02&#xff09;\u2014\u2014 \u5747\u4e0d\u6784\u6210\u91cd\u5199&#xff0c;\u4f1a\u88ab\u89c6\u4e3a\u6d3e\u751f\u7c7b\u65b0\u589e\u7684\u666e\u901a\u51fd\u6570\u3002\u200b<\/li>\n<\/ul>\n<p>2.<span style=\"color:#fe2c24\"> \u7b2c\u4e8c\u540c&#xff1a;\u53c2\u6570\u5217\u8868\u5b8c\u5168\u76f8\u540c&#xff08;\u91cd\u70b9&#xff1a;\u7c7b\u578b\u4e00\u81f4&#xff0c;\u975e\u540d\u5b57 \/ \u7f3a\u7701\u503c\u4e00\u81f4&#xff09;\u200b<\/span><\/p>\n<p>\u8fd9\u662f\u6700\u6613\u6df7\u6dc6\u7684\u89c4\u5219&#xff0c;\u9700\u660e\u786e&#xff1a;\u201c\u53c2\u6570\u5217\u8868\u76f8\u540c\u201d \u7684\u6838\u5fc3\u662f\u5f62\u53c2\u7684 \u201c\u7c7b\u578b\u53ca\u987a\u5e8f\u201d \u5b8c\u5168\u4e00\u81f4&#xff0c;\u4e0e\u5f62\u53c2\u7684 \u201c\u540d\u5b57\u201d \u548c \u201c\u7f3a\u7701\u503c\u201d \u65e0\u5173&#xff0c;\u5177\u4f53\u7ec6\u8282\u5982\u4e0b&#xff1a;\u200b<\/p>\n<ul>\n<li>\u5141\u8bb8\u4e0d\u540c\u7684\u60c5\u51b5&#xff1a;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u5f62\u53c2\u540d\u5b57\u4e0d\u540c&#xff1a;\u57fa\u7c7bvirtual void showInfo(int age)&#xff0c;\u6d3e\u751f\u7c7bvirtual void showInfo(int userAge)\u2014\u2014 \u5f62\u53c2\u540d\u5b57age\u4e0euserAge\u4e0d\u540c&#xff0c;\u4f46\u7c7b\u578b\u5747\u4e3aint&#xff0c;\u4e0d\u5f71\u54cd\u91cd\u5199&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7f3a\u7701\u503c\u4e0d\u540c&#xff1a;\u57fa\u7c7bvirtual void calcPrice(double discount &#061; 0.9)&#xff0c;\u6d3e\u751f\u7c7bvirtual void calcPrice(double discount &#061; 0.75)\u2014\u2014 \u7f3a\u7701\u503c\u4e0d\u540c&#xff0c;\u4f46\u7c7b\u578b\u5747\u4e3adouble&#xff0c;\u4ecd\u6784\u6210\u91cd\u5199&#xff08;\u4f46\u5b9e\u9645\u8c03\u7528\u65f6\u7f3a\u7701\u503c\u6309 \u201c\u9759\u6001\u7c7b\u578b\u201d \u53d6&#xff0c;\u9700\u8c28\u614e\u4f7f\u7528&#xff09;\u3002\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u4e0d\u5141\u8bb8\u4e0d\u540c\u7684\u60c5\u51b5&#xff08;\u7c7b\u578b\u6216\u987a\u5e8f\u5dee\u5f02&#xff09;&#xff1a;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u5f62\u53c2\u7c7b\u578b\u4e0d\u540c&#xff1a;\u57fa\u7c7bvirtual void setScore(double score)&#xff0c;\u6d3e\u751f\u7c7bvirtual void setScore(int score)\u2014\u2014 \u524d\u8005double\u3001\u540e\u8005int&#xff0c;\u7c7b\u578b\u4e0d\u5339\u914d&#xff0c;\u4e0d\u6784\u6210\u91cd\u5199&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u5f62\u53c2\u6570\u91cf\u4e0d\u540c&#xff1a;\u57fa\u7c7bvirtual void print(int a)&#xff0c;\u6d3e\u751f\u7c7bvirtual void print(int a, int b)\u2014\u2014 \u53c2\u6570\u6570\u91cf\u5dee\u5f02&#xff0c;\u4e0d\u6784\u6210\u91cd\u5199&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u5f62\u53c2\u987a\u5e8f\u4e0d\u540c&#xff1a;\u57fa\u7c7bvirtual void func(int a, double b)&#xff0c;\u6d3e\u751f\u7c7bvirtual void func(double a, int b)\u2014\u2014 \u7c7b\u578b\u987a\u5e8f\u5dee\u5f02&#xff0c;\u4e0d\u6784\u6210\u91cd\u5199\u3002\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u9519\u8bef\u793a\u4f8b\u8b66\u793a&#xff1a;\u200b<\/li>\n<\/ul>\n<p>class Base {<br \/>\npublic:<br \/>\n    virtual void add(int x, double y) {} \/\/ \u57fa\u7c7b\u865a\u51fd\u6570&#xff1a;int &#043; double<br \/>\n};<br \/>\nclass Derived : public Base {<br \/>\npublic:<br \/>\n    \/\/ \u9519\u8bef1&#xff1a;\u5f62\u53c2\u7c7b\u578b\u987a\u5e8f\u98a0\u5012&#xff0c;\u4e0d\u6784\u6210\u91cd\u5199<br \/>\n    virtual void add(double x, int y) {}<br \/>\n    \/\/ \u9519\u8bef2&#xff1a;\u5f62\u53c2\u7c7b\u578b\u6539\u4e3aint&#043;int&#xff0c;\u4e0d\u6784\u6210\u91cd\u5199<br \/>\n    virtual void add(int x, int y) {}<br \/>\n    \/\/ \u6b63\u786e&#xff1a;\u5f62\u53c2\u7c7b\u578b\u53ca\u987a\u5e8f\u4e0e\u57fa\u7c7b\u4e00\u81f4&#xff0c;\u4ec5\u540d\u5b57\u4e0d\u540c&#xff0c;\u6784\u6210\u91cd\u5199<br \/>\n    virtual void add(int a, double b) {}<br \/>\n};<\/p>\n<p>3. <span style=\"color:#fe2c24\">\u7b2c\u4e09\u540c&#xff1a;\u8fd4\u56de\u503c\u7c7b\u578b\u5b8c\u5168\u76f8\u540c&#xff08;\u7279\u6b8a&#xff1a;\u534f\u53d8\u573a\u666f\u9664\u5916&#xff09;\u200b<\/span><\/p>\n<ul>\n<li>\u57fa\u672c\u89c4\u5219&#xff1a;\u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u5fc5\u987b\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u5b8c\u5168\u4e00\u81f4&#xff0c;\u5982\u57fa\u7c7b\u8fd4\u56devoid&#xff0c;\u6d3e\u751f\u7c7b\u4e5f\u9700\u8fd4\u56devoid&#xff1b;\u57fa\u7c7b\u8fd4\u56deint&#xff0c;\u6d3e\u751f\u7c7b\u4e5f\u9700\u8fd4\u56deint\u3002\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7279\u6b8a\u573a\u666f&#xff1a;\u534f\u53d8&#xff08;\u7236\u5b50\u7c7b\u6307\u9488 \/ \u5f15\u7528\u8fd4\u56de&#xff09;\u200b<\/li>\n<\/ul>\n<p>\u82e5\u57fa\u7c7b\u865a\u51fd\u6570\u8fd4\u56de \u201c\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u201d&#xff0c;\u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u8fd4\u56de \u201c\u6d3e\u751f\u7c7b\u6307\u9488 \/ \u5f15\u7528\u201d&#xff0c;\u4e14\u4e8c\u8005\u4e3a\u7ee7\u627f\u5173\u7cfb&#xff08;\u5982\u57fa\u7c7bPerson*&#xff0c;\u6d3e\u751f\u7c7bStudent*&#xff09;&#xff0c;\u5219\u89c6\u4e3a\u8fd4\u56de\u503c\u7c7b\u578b\u517c\u5bb9&#xff0c;\u4ecd\u6784\u6210\u91cd\u5199&#xff08;\u8fd9\u662f \u201c\u4e09\u540c\u201d \u7684\u552f\u4e00\u4f8b\u5916&#xff0c;\u79f0\u4e3a\u534f\u53d8&#xff09;\u3002\u200b<\/p>\n<ul>\n<li>\u793a\u4f8b&#xff1a;\u200b<\/li>\n<\/ul>\n<p>class Person {};<br \/>\nclass Student : public Person {};<br \/>\nclass Base {<br \/>\npublic:<br \/>\n    \/\/ \u57fa\u7c7b\u865a\u51fd\u6570\u8fd4\u56de\u57fa\u7c7b\u6307\u9488<br \/>\n    virtual Person* createPerson() { return new Person(); }<br \/>\n};<br \/>\nclass Derived : public Base {<br \/>\npublic:<br \/>\n    \/\/ \u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u8fd4\u56de\u6d3e\u751f\u7c7b\u6307\u9488&#xff0c;\u6784\u6210\u534f\u53d8&#xff0c;\u5c5e\u4e8e\u5408\u6cd5\u91cd\u5199<br \/>\n    virtual Student* createPerson() override { return new Student(); }<br \/>\n};<\/p>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u534f\u53d8\u4ec5\u652f\u6301 \u201c\u6307\u9488\u6216\u5f15\u7528\u201d&#xff0c;\u4e0d\u652f\u6301\u503c\u7c7b\u578b \u2014\u2014 \u82e5\u57fa\u7c7b\u8fd4\u56dePerson&#xff08;\u503c\u7c7b\u578b&#xff09;&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deStudent&#xff08;\u503c\u7c7b\u578b&#xff09;&#xff0c;\u5219\u4e0d\u6784\u6210\u91cd\u5199&#xff08;\u4f1a\u89e6\u53d1\u5207\u7247&#xff0c;\u4e14\u7f16\u8bd1\u62a5\u9519&#xff09;\u3002\u200b<\/li>\n<\/ul>\n<h4>\u4e09\u3001\u91cd\u5199\u7684\u524d\u63d0&#xff1a;\u57fa\u7c7b\u51fd\u6570\u5fc5\u987b\u662f\u865a\u51fd\u6570\u200b<\/h4>\n<p>\u9664 \u201c\u4e09\u540c\u201d \u5916&#xff0c;\u8fd8\u6709\u4e00\u4e2a\u9690\u6027\u524d\u63d0&#xff1a;\u57fa\u7c7b\u7684\u51fd\u6570\u5fc5\u987b\u88abvirtual\u5173\u952e\u5b57\u4fee\u9970&#xff08;\u5373\u865a\u51fd\u6570&#xff09;\u3002\u82e5\u57fa\u7c7b\u51fd\u6570\u4e0d\u662f\u865a\u51fd\u6570&#xff0c;\u5373\u4fbf\u6d3e\u751f\u7c7b\u51fd\u6570\u4e0e\u57fa\u7c7b\u6ee1\u8db3 \u201c\u4e09\u540c\u201d&#xff0c;\u4e5f\u53ea\u662f \u201c\u9690\u85cf\u201d&#xff08;hide&#xff09;\u57fa\u7c7b\u51fd\u6570&#xff0c;\u800c\u975e \u201c\u91cd\u5199\u201d\u2014\u2014 \u8c03\u7528\u65f6\u4f1a\u6839\u636e\u6307\u9488 \/ \u5f15\u7528\u7684 \u201c\u9759\u6001\u7c7b\u578b\u201d \u7ed1\u5b9a&#xff0c;\u65e0\u6cd5\u89e6\u53d1\u591a\u6001\u3002\u200b<\/p>\n<ul>\n<li>\u53cd\u4f8b&#xff08;\u65e0\u91cd\u5199&#xff0c;\u4ec5\u9690\u85cf&#xff09;&#xff1a;\u200b<\/li>\n<\/ul>\n<p>class Base {<br \/>\npublic:<br \/>\n    \/\/ \u57fa\u7c7b\u51fd\u6570\u65e0virtual&#xff0c;\u4e0d\u662f\u865a\u51fd\u6570<br \/>\n    void show() { cout &lt;&lt; &#034;Base show&#034; &lt;&lt; endl; }<br \/>\n};<br \/>\nclass Derived : public Base {<br \/>\npublic:<br \/>\n    \/\/ \u867d\u6ee1\u8db3\u201c\u4e09\u540c\u201d&#xff0c;\u4f46\u57fa\u7c7b\u51fd\u6570\u975e\u865a\u51fd\u6570&#xff0c;\u4ec5\u9690\u85cf\u57fa\u7c7bshow<br \/>\n    void show() { cout &lt;&lt; &#034;Derived show&#034; &lt;&lt; endl; }<br \/>\n};<br \/>\n\/\/ \u8c03\u7528\u65f6&#xff1a;Base* p &#061; new Derived(); p-&gt;show();<br \/>\n\/\/ \u7ed3\u679c&#xff1a;\u8f93\u51fa\u201cBase show\u201d&#xff08;\u9759\u6001\u7ed1\u5b9a&#xff0c;\u65e0\u591a\u6001&#xff09;<\/p>\n<h4>\u56db\u3001\u91cd\u5199\u7684\u9a8c\u8bc1&#xff1a;\u501f\u52a9 C&#043;&#043;11 \u7684override\u5173\u952e\u5b57\u200b<\/h4>\n<p>\u4e3a\u907f\u514d\u56e0 \u201c\u4e09\u540c\u201d \u89c4\u5219\u4e0d\u6ee1\u8db3\u5bfc\u81f4\u7684\u9690\u6027\u91cd\u5199\u5931\u8d25&#xff0c;\u5efa\u8bae\u5728\u6d3e\u751f\u7c7b\u91cd\u5199\u51fd\u6570\u540e\u52a0override\u5173\u952e\u5b57 \u2014\u2014 \u5b83\u4f1a\u8ba9\u7f16\u8bd1\u5668\u5f3a\u5236\u68c0\u67e5 \u201c\u662f\u5426\u6ee1\u8db3\u91cd\u5199\u6761\u4ef6\u201d&#xff1a;\u82e5\u4e0d\u6ee1\u8db3&#xff08;\u5982\u53c2\u6570\u7c7b\u578b\u4e0d\u5339\u914d\u3001\u57fa\u7c7b\u51fd\u6570\u975e\u865a\u51fd\u6570&#xff09;&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u76f4\u63a5\u62a5\u9519&#xff0c;\u5e2e\u52a9\u5f00\u53d1\u8005\u63d0\u524d\u53d1\u73b0\u95ee\u9898\u3002\u200b<\/p>\n<ul>\n<li>\u793a\u4f8b&#xff08;\u6b63\u786e\u4f7f\u7528override&#xff09;&#xff1a;\u200b<\/li>\n<\/ul>\n<p>class Person {<br \/>\npublic:<br \/>\n    virtual void buyTicket(double price) { cout &lt;&lt; &#034;\u5168\u4ef7&#xff1a;&#034; &lt;&lt; price &lt;&lt; endl; }<br \/>\n};<br \/>\nclass Student : public Person {<br \/>\npublic:<br \/>\n    \/\/ \u52a0override&#xff0c;\u7f16\u8bd1\u5668\u68c0\u67e5\u91cd\u5199\u6761\u4ef6<br \/>\n    virtual void buyTicket(double price) override {<br \/>\n        cout &lt;&lt; &#034;75\u6298&#xff1a;&#034; &lt;&lt; price * 0.75 &lt;&lt; endl;<br \/>\n    }<br \/>\n    \/\/ \u9519\u8bef\u793a\u4f8b&#xff1a;\u53c2\u6570\u7c7b\u578b\u6539\u4e3aint&#xff0c;\u7f16\u8bd1\u5668\u62a5\u9519&#xff08;\u4e0d\u6ee1\u8db3\u4e09\u540c&#xff09;<br \/>\n    \/\/ virtual void buyTicket(int price) override { &#8230; }<br \/>\n};<\/p>\n<h4>\u4e94\u3001\u5e38\u89c1\u6613\u9519\u70b9\u603b\u7ed3\u200b<\/h4>\n<li>\u6df7\u6dc6 \u201c\u5f62\u53c2\u540d\u5b57\u201d \u4e0e \u201c\u5f62\u53c2\u7c7b\u578b\u201d&#xff1a;\u8bef\u4ee5\u4e3a\u5f62\u53c2\u540d\u5b57\u4e0d\u540c\u5c31\u4e0d\u6784\u6210\u91cd\u5199 \u2014\u2014 \u5b9e\u9645\u53ea\u9700\u7c7b\u578b\u4e00\u81f4&#xff1b;\u200b<\/li>\n<li>\u5ffd\u7565 \u201c\u5f62\u53c2\u987a\u5e8f\u201d&#xff1a;\u8bef\u4ee5\u4e3a\u53c2\u6570\u7c7b\u578b\u76f8\u540c\u5373\u53ef&#xff0c;\u987a\u5e8f\u4e0d\u540c\u4e5f\u6ca1\u5173\u7cfb \u2014\u2014 \u987a\u5e8f\u5c5e\u4e8e\u53c2\u6570\u5217\u8868\u7684\u4e00\u90e8\u5206&#xff0c;\u5fc5\u987b\u4e00\u81f4&#xff1b;\u200b<\/li>\n<li>\u57fa\u7c7b\u51fd\u6570\u5fd8\u52a0virtual&#xff1a;\u8bef\u4ee5\u4e3a \u201c\u4e09\u540c\u201d \u5c31\u591f&#xff0c;\u5ffd\u7565\u57fa\u7c7b\u51fd\u6570\u9700\u662f\u865a\u51fd\u6570 \u2014\u2014 \u65e0virtual\u5219\u65e0\u91cd\u5199&#xff1b;\u200b<\/li>\n<li>\u534f\u53d8\u8bef\u7528&#xff1a;\u8bef\u4ee5\u4e3a\u503c\u7c7b\u578b\u4e5f\u652f\u6301\u534f\u53d8 \u2014\u2014 \u4ec5\u6307\u9488 \/ \u5f15\u7528\u652f\u6301&#xff0c;\u503c\u7c7b\u578b\u4e0d\u652f\u6301\u3002\u200b<\/li>\n<h3>\u793a\u4f8b\u4ee3\u7801&#xff1a;<\/h3>\n<p>OK\u5927\u5bb6&#xff0c;\u4e86\u89e3\u5b8c\u4e86\u4e0a\u9762&#xff0c;\u6211\u4eec\u5c31\u53ef\u4ee5\u770b\u770b\u793a\u4f8b\u4ee3\u7801\u8fdb\u884c\u8fdb\u4e00\u6b65\u4e86\u89e3\u4e86&#xff1a;<\/p>\n<p>class person<br \/>\n{<br \/>\npublic:<br \/>\nvirtual void buyticket(int ticketprice &#061; 80)<br \/>\n{<br \/>\ncout &lt;&lt; &#034;\u662f\u666e\u901a\u4eba&#xff0c;\u539f\u4ef7\u4e70\u7968&#034; &lt;&lt; endl;<br \/>\ncout &lt;&lt; &#034;\u7968\u4ef7&#061;&#034; &lt;&lt; ticketprice &lt;&lt; endl;<br \/>\n}<br \/>\nprotected:<br \/>\nint mnum &#061; 0;<\/p>\n<p>};<br \/>\nclass student :public person\/\/\u518d\u6b21\u5f3a\u8c03&#xff0c;\u591a\u6001\u4f7f\u7528\u7684\u524d\u63d0\u662f\u7ee7\u627f<br \/>\n{<br \/>\npublic:<br \/>\n\/\/\u8981\u548c\u7236\u7c7b\u6240\u5199\u7684\u865a\u51fd\u6570\u6784\u6210\u91cd\u5199\u51fd\u6570<br \/>\n\/\/\u4e09\u540c&#xff1a;\u8fd4\u56de\u7c7b\u578b\u76f8\u540c&#xff0c;\u51fd\u6570\u540d\u5b57&#xff0c;\u5f62\u53c2\u7c7b\u578b\u76f8\u540c<br \/>\nvirtual void buyticket(int ticketprice &#061; 80)<br \/>\n{<br \/>\ncout &lt;&lt; &#034;\u662f\u5b66\u751f&#xff0c;85\u6298\u4e70\u7968&#034; &lt;&lt; endl;<br \/>\ncout &lt;&lt; &#034;\u7968\u4ef7&#061;&#034; &lt;&lt; ticketprice*0.85 &lt;&lt; endl;<br \/>\n}<br \/>\nprotected:<br \/>\nint mid &#061; 0;<br \/>\n};<br \/>\n\/\/\u8c03\u7528\u865a\u51fd\u6570\u7684\u51fd\u6570<br \/>\n\/\/\u6ce8\u610f\u51fd\u6570\u5f62\u53c2\u7c7b\u578b\u8981\u662f\u7236\u7c7b\u7c7b\u578b\u7684\u6307\u9488\u6216\u8005\u5f15\u7528<br \/>\nvoid printzhizhen(person* ptr)<br \/>\n{<br \/>\nptr-&gt;buyticket();<br \/>\n\/\/\u5982\u679c\u4e0d\u6784\u6210\u591a\u6001\u7684\u8bdd&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u76f8\u5f53\u4e8e\u662f\u8fd0\u884cprint\u51fd\u6570\u5f62\u53c2\u7c7b\u578b\u91cc\u9762\u7684\u51fd\u6570<br \/>\n\/\/\u800c\u8981\u662f\u6784\u6210\u591a\u6001\u7684\u8bdd&#xff0c;\u90a3\u4e48\u7f16\u8bd1\u5668\u4f1a\u5ffd\u7565print\u51fd\u6570\u5f62\u53c2\u7c7b\u578b\u91cc\u9762\u7684\u51fd\u6570<br \/>\n\/\/\u800c\u662f\u53bb\u770b\u6211\u4eec\u6240\u4f20\u5165\u7684\u5bf9\u8c61\u662f\u54ea\u4e2a\u7c7b\u7684<br \/>\n\/\/\u7136\u540e\u53bb\u8fd0\u884c\u5bf9\u5e94\u7684\u5bf9\u8c61\u7684\u7c7b\u7684\u51fd\u6570<br \/>\n}<\/p>\n<p>void printyinyong(person&amp; ptr)<br \/>\n{<br \/>\n\/\/\u8fd9\u91cc\u53ef\u4ee5\u770b\u5230\u867d\u7136\u90fd\u662fPerson\u6307\u9488Ptr\u5728\u8c03\u7528BuyTicket<br \/>\n\/\/\u4f46\u662f\u8ddfptr\u6ca1\u5173\u7cfb&#xff0c;\u800c\u662f\u7531ptr\u6307\u5411\u7684\u5bf9\u8c61\u51b3\u5b9a\u7684\u3002<br \/>\nptr.buyticket();<br \/>\n\/\/\u5982\u679c\u4e0d\u6784\u6210\u591a\u6001\u7684\u8bdd&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u76f8\u5f53\u4e8e\u662f\u8fd0\u884cprint\u51fd\u6570\u5f62\u53c2\u7c7b\u578b\u91cc\u9762\u7684\u51fd\u6570<br \/>\n\/\/\u800c\u8981\u662f\u6784\u6210\u591a\u6001\u7684\u8bdd&#xff0c;\u90a3\u4e48\u7f16\u8bd1\u5668\u4f1a\u5ffd\u7565print\u51fd\u6570\u5f62\u53c2\u7c7b\u578b\u91cc\u9762\u7684\u51fd\u6570<br \/>\n\/\/\u800c\u662f\u53bb\u770b\u6211\u4eec\u6240\u4f20\u5165\u7684\u5bf9\u8c61\u662f\u54ea\u4e2a\u7c7b\u7684<br \/>\n\/\/\u7136\u540e\u53bb\u8fd0\u884c\u5bf9\u5e94\u7684\u5bf9\u8c61\u7684\u7c7b\u7684\u51fd\u6570<br \/>\n}<\/p>\n<p>int main()<br \/>\n{<br \/>\nperson p;<br \/>\nstudent s;<br \/>\nprintzhizhen(&amp;p);\/\/\u4f20\u5730\u5740<br \/>\nprintzhizhen(&amp;s);\/\/\u4f20\u5730\u5740<\/p>\n<p>cout&lt;&lt;endl;<\/p>\n<p>printyinyong(p);\/\/\u76f4\u63a5\u4f20\u5bf9\u8c61\u5c31\u884c<br \/>\nprintyinyong(s);\/\/\u76f4\u63a5\u4f20\u5bf9\u8c61\u5c31\u884c<br \/>\nreturn 0;<br \/>\n}<\/p>\n<h3>\u4e00\u4e2a\u5c0f\u70b9&#xff1a;<\/h3>\n<p>\u5728\u91cd\u5199\u57fa\u7c7b\u865a\u51fd\u6570\u65f6\u9700\u6ce8\u610f&#xff0c;\u5373\u4fbf\u6d3e\u751f\u7c7b\u7684\u865a\u51fd\u6570\u4e0d\u52a0virtual\u5173\u952e\u5b57&#xff0c;\u4e5f\u53ef\u6784\u6210\u91cd\u5199 \u2014\u2014 \u8fd9\u662f\u56e0\u4e3a\u6d3e\u751f\u7c7b\u4f1a\u7ee7\u627f\u57fa\u7c7b\u865a\u51fd\u6570\u7684\u5c5e\u6027&#xff0c;\u5373\u4fbf\u4e0d\u663e\u5f0f\u6dfb\u52a0virtual&#xff0c;\u8be5\u51fd\u6570\u5728\u6d3e\u751f\u7c7b\u4e2d\u4f9d\u65e7\u4fdd\u6301\u865a\u51fd\u6570\u7279\u6027&#xff0c;\u53ea\u8981\u6ee1\u8db3 \u201c\u4e09\u540c\u201d \u6761\u4ef6&#xff08;\u8fd4\u56de\u503c\u7c7b\u578b\u3001\u51fd\u6570\u540d\u5b57\u3001\u53c2\u6570\u5217\u8868\u5b8c\u5168\u76f8\u540c&#xff09;&#xff0c;\u5c31\u80fd\u5b8c\u6210\u5bf9\u57fa\u7c7b\u865a\u51fd\u6570\u7684\u91cd\u5199\u3002<\/p>\n<p>\u4f46\u8fd9\u79cd\u7701\u7565virtual\u7684\u5199\u6cd5\u5e76\u4e0d\u89c4\u8303&#xff0c;\u4f1a\u964d\u4f4e\u4ee3\u7801\u53ef\u8bfb\u6027&#xff08;\u540e\u7eed\u7ef4\u62a4\u8005\u53ef\u80fd\u8bef\u5224\u51fd\u6570\u662f\u5426\u4e3a\u865a\u51fd\u6570&#xff09;&#xff0c;\u56e0\u6b64\u4e0d\u5efa\u8bae\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u4f7f\u7528&#xff1b;\u4e0d\u8fc7\u5728\u8003\u8bd5\u9009\u62e9\u9898\u4e2d&#xff0c;\u8fd9\u7c7b\u573a\u666f\u7ecf\u5e38\u88ab\u4f5c\u4e3a\u8003\u70b9&#xff0c;\u7528\u4e8e\u8003\u67e5\u5bf9\u91cd\u5199\u89c4\u5219\u7684\u7406\u89e3&#xff0c;\u5224\u65ad\u7701\u7565virtual\u540e\u662f\u5426\u4ecd\u80fd\u6784\u6210\u91cd\u5199\u3001\u662f\u5426\u652f\u6301\u591a\u6001\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u793a\u4f8b\u4ee3\u7801&#xff1a;<\/p>\n<p>class Animal<br \/>\n{<br \/>\npublic:<br \/>\nvirtual void talk() const<br \/>\n{}<br \/>\n};<\/p>\n<p>class Dog : public Animal<br \/>\n{<br \/>\npublic:<br \/>\nvirtual void talk() const<br \/>\n{<br \/>\nstd::cout &lt;&lt; &#034;\u6c6a\u6c6a&#034; &lt;&lt; std::endl;<br \/>\n}<br \/>\n};<\/p>\n<p>class Cat : public Animal<br \/>\n{<br \/>\npublic:<br \/>\nvoid talk() const<br \/>\n{<br \/>\n\/\/\u6bd4\u5982\u6211\u5728Cat\u8fd9\u4e2a\u5b50\u7c7b\u4e0d\u52a0virtual&#xff0c;\u4f46\u662f\u7531\u4e8e\u8fd9\u4e2a\u51fd\u6570\u4e5f\u662f\u8fbe\u5230\u4e09\u540c&#xff0c;<br \/>\n\/\/\u6240\u4ee5\u4e5f\u6784\u6210\u91cd\u5199\u4ee5\u53ca\u865a\u51fd\u6570<br \/>\n\/\/&#xff08;\u56e0\u4e3a\u7ee7\u627f\u540e\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u88ab\u7ee7\u627f\u4e0b\u6765&#xff0c;\u5728\u6d3e\u751f\u7c7b\u4e2d\u4f9d\u65e7\u4fdd\u6301\u865a\u51fd\u6570\u5c5e\u6027&#xff09;<br \/>\nstd::cout &lt;&lt; &#034;(&gt;^\u03c9^&lt;)\u55b5&#034; &lt;&lt; std::endl;<br \/>\n}<br \/>\n};<\/p>\n<p>void letsHear(const Animal&amp; animal)<br \/>\n{<br \/>\nanimal.talk();<br \/>\n}<\/p>\n<p>int main()<br \/>\n{<br \/>\nCat cat;<br \/>\nDog dog;<br \/>\nletsHear(cat);<br \/>\nletsHear(dog);<br \/>\nreturn 0;<br \/>\n}<\/p>\n<p>\u5927\u5bb6\u4ed4\u7ec6\u770b\u4ee3\u7801\u91cc\u7684\u6ce8\u91ca\u54e6&#xff0c;\u4f1a\u5f88\u6709\u5e2e\u52a9\u3002<\/p>\n<h3>\u591a\u6001\u573a\u666f\u7684\u4e00\u4e2a\u9009\u62e9\u9898&#xff1a;<\/h3>\n<p>OK\u5927\u5bb6&#xff0c;\u4e86\u89e3\u5b8c\u4e86\u4e4b\u540e&#xff0c;\u6211\u4eec\u6765\u770b\u770b\u4e00\u9053\u9009\u62e9\u9898&#xff0c;\u8fd9\u9053\u9009\u62e9\u9898\u53ef\u662f\u975e\u5e38\u6709\u610f\u601d&#xff0c;\u975e\u5e38\u6076\u5fc3\u4eba&#xff0c;\u6211\u4eec\u5148\u770b\u4ee3\u7801&#xff1a;<\/p>\n<h4>\u9898\u76ee&#xff1a;<\/h4>\n<p>class A<br \/>\n{<br \/>\npublic:<br \/>\nvirtual void func(int val &#061; 1)<br \/>\n{<br \/>\nstd::cout &lt;&lt; &#034;A-&gt;&#034; &lt;&lt; val &lt;&lt; std::endl;<br \/>\n}<br \/>\nvirtual void test() \/\/\u91cc\u9762\u53c2\u6570\u662f\u6709\u7740this\u6307\u9488\u7684&#xff0c;\u4e0d\u8981\u5fd8\u8bb0\u4e86<br \/>\n{<br \/>\nfunc();<br \/>\n}<br \/>\n};<br \/>\nclass B : public A<br \/>\n{<br \/>\npublic:<br \/>\nvoid func(int val &#061; 0)<br \/>\n{<br \/>\nstd::cout &lt;&lt; &#034;B-&gt;&#034; &lt;&lt; val &lt;&lt; std::endl;<br \/>\n}<br \/>\n};<\/p>\n<p>int main(int argc, char* argv[])<br \/>\n{<br \/>\nB* p &#061; new B;<br \/>\np-&gt;test();<br \/>\nreturn 0;<br \/>\n}<\/p>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u8f93\u51fa\u7ed3\u679c\u662f\u4ec0\u4e48&#xff08;&#xff09;<br \/>\nA: A-&gt;0 B: B-&gt;1 C: A-&gt;1 D: B-&gt;0 E: \u7f16\u8bd1\u51fa\u9519 F: \u4ee5\u4e0a\u90fd\u4e0d\u6b63\u786e<\/p>\n<h4>\u7b54\u6848\u53ca\u89e3\u6790&#xff1a;<\/h4>\n<p>\u54c8\u54c8\u5927\u5bb6&#xff0c;\u6211\u76f8\u4fe1\u5f88\u591a\u4eba\u90fd\u4f1a\u9009\u62e9D&#xff0c;\u53ef\u60dc\u7b54\u6848\u662fB&#xff0c;\u90a3\u4e48\u662f\u4e3a\u4ec0\u4e48\u5462&#xff0c;\u6211\u4eec\u6765\u770b\u89e3\u6790&#xff1a;<\/p>\n<p>\u8fd9\u4e00\u73b0\u8c61\u7684\u672c\u8d28\u662f \u201c\u865a\u51fd\u6570\u7684\u591a\u6001\u6027\u4ec5\u4f5c\u7528\u4e8e\u51fd\u6570\u4f53&#xff0c;\u7f3a\u7701\u503c\u5c5e\u4e8e\u51fd\u6570\u58f0\u660e\u7684\u9759\u6001\u5c5e\u6027&#xff0c;\u4e0d\u53c2\u4e0e\u52a8\u6001\u7ed1\u5b9a\u201d&#xff0c;\u5177\u4f53\u53ef\u4ece\u4e09\u4e2a\u5173\u952e\u77e5\u8bc6\u70b9\u5c55\u5f00&#xff1a;\u200b<\/p>\n<p>1. \u7b2c\u4e00\u6b65&#xff1a;\u591a\u6001\u7684\u5b9e\u73b0\u4f9d\u8d56 \u201c\u51fd\u6570\u4f53\u7684\u52a8\u6001\u7ed1\u5b9a\u201d\u200b<\/p>\n<p>\u5f53\u8c03\u7528\u865a\u51fd\u6570func\u65f6&#xff0c;\u591a\u6001\u7684\u6838\u5fc3\u662f \u201c\u6839\u636e\u6307\u9488 \/ \u5bf9\u8c61\u7684\u52a8\u6001\u7c7b\u578b&#xff08;\u5373\u5b9e\u9645\u6307\u5411\u7684\u5bf9\u8c61\u7c7b\u578b&#xff09;&#xff0c;\u627e\u5230\u5bf9\u5e94\u7684\u51fd\u6570\u4f53\u6267\u884c\u201d&#xff1a;\u200b<\/p>\n<ul>\n<li>\u5728\u4ee3\u7801\u4e2d&#xff0c;\u6307\u9488p\u7684\u9759\u6001\u7c7b\u578b\u662fB*&#xff08;\u7f16\u8bd1\u65f6\u5df2\u77e5&#xff09;&#xff0c;\u52a8\u6001\u7c7b\u578b\u4e5f\u662fB*&#xff08;\u6307\u5411B\u7c7b\u5bf9\u8c61&#xff09;&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7531\u4e8efunc\u662f\u865a\u51fd\u6570\u4e14\u5df2\u91cd\u5199&#xff0c;\u7a0b\u5e8f\u4f1a\u5728\u8fd0\u884c\u65f6\u901a\u8fc7p\u7684\u865a\u8868\u6307\u9488&#xff08;__vfptr&#xff09;&#xff0c;\u627e\u5230B\u7c7b\u865a\u8868\u4e2dfunc\u5bf9\u5e94\u7684\u5730\u5740 \u2014\u2014 \u5373B::func\u7684\u51fd\u6570\u4f53&#xff0c;\u56e0\u6b64\u6700\u7ec8\u6267\u884c\u7684\u662fcout &lt;&lt; &#034;B-&gt;&#034; &lt;&lt; val &lt;&lt; endl;&#xff08;\u4f53\u73b0 \u201c\u5b50\u7c7b\u51fd\u6570\u4f53\u201d&#xff09;\u3002\u200b<\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u9700\u8981\u660e\u786e&#xff1a;\u865a\u51fd\u6570\u7684\u52a8\u6001\u7ed1\u5b9a\u53ea\u8d1f\u8d23\u5339\u914d \u201c\u51fd\u6570\u4f53\u201d&#xff0c;\u4e0d\u6d89\u53ca \u201c\u51fd\u6570\u58f0\u660e\u4e2d\u7684\u7f3a\u7701\u503c\u201d\u2014\u2014 \u7f3a\u7701\u503c\u7684\u786e\u5b9a\u4e0d\u4f9d\u8d56\u865a\u8868&#xff0c;\u800c\u662f\u7531\u7f16\u8bd1\u65f6\u7684\u9759\u6001\u7c7b\u578b\u51b3\u5b9a\u3002\u200b<\/p>\n<p>2. \u7b2c\u4e8c\u6b65&#xff1a;\u7f3a\u7701\u503c\u7684\u786e\u5b9a\u4f9d\u8d56 \u201c\u51fd\u6570\u58f0\u660e\u7684\u9759\u6001\u7ed1\u5b9a\u201d\u200b<\/p>\n<p>C&#043;&#043; \u6807\u51c6\u89c4\u5b9a&#xff1a;\u51fd\u6570\u7684\u7f3a\u7701\u53c2\u6570\u5c5e\u4e8e \u201c\u51fd\u6570\u58f0\u660e\u7684\u4e00\u90e8\u5206\u201d&#xff0c;\u5176\u503c\u7531\u8c03\u7528\u8005\u7684 \u201c\u9759\u6001\u7c7b\u578b\u201d&#xff08;\u7f16\u8bd1\u65f6\u5df2\u77e5\u7684\u7c7b\u578b&#xff09;\u51b3\u5b9a&#xff0c;\u800c\u975e\u52a8\u6001\u7c7b\u578b\u3002\u5177\u4f53\u903b\u8f91\u5982\u4e0b&#xff1a;\u200b<\/p>\n<ul>\n<li>\u5f53\u8c03\u7528p-&gt;func();\u65f6&#xff0c;\u672a\u663e\u5f0f\u4f20\u53c2&#xff0c;\u7f16\u8bd1\u5668\u9700\u8981\u786e\u5b9a \u201c\u4f7f\u7528\u54ea\u4e2a\u7f3a\u7701\u503c\u201d&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u9636\u6bb5&#xff0c;\u53ea\u80fd\u83b7\u53d6\u6307\u9488p\u7684\u9759\u6001\u7c7b\u578b&#xff08;B*&#xff0c;\u6216\u82e5\u4e3a\u57fa\u7c7b\u6307\u9488\u5219\u662fA*&#xff09;&#xff0c;\u65e0\u6cd5\u9884\u77e5\u5176\u52a8\u6001\u7c7b\u578b&#xff08;\u8fd0\u884c\u65f6\u624d\u786e\u5b9a&#xff09;&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li><span style=\"color:#fe2c24\">\u5bf9\u4e8e\u865a\u51fd\u6570\u7684\u7f3a\u7701\u503c&#xff0c;\u7f16\u8bd1\u5668\u4f1a \u201c\u56de\u6eaf\u5230\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u58f0\u660e\u201d\u2014\u2014 \u56e0\u4e3a\u6d3e\u751f\u7c7b\u7684func\u662f\u91cd\u5199\u57fa\u7c7b\u7684\u865a\u51fd\u6570&#xff0c;\u5176\u51fd\u6570\u58f0\u660e&#xff08;\u5305\u62ec\u53c2\u6570\u5217\u8868\u3001\u7f3a\u7701\u503c&#xff09;\u672c\u8d28\u662f \u201c\u7ee7\u627f\u5e76\u517c\u5bb9\u57fa\u7c7b\u201d&#xff0c;\u7f3a\u7701\u503c\u4f5c\u4e3a\u51fd\u6570\u58f0\u660e\u7684\u9759\u6001\u5c5e\u6027&#xff0c;\u4f1a\u88ab\u7f16\u8bd1\u5668\u7ed1\u5b9a\u5230\u57fa\u7c7b\u7684\u58f0\u660e\u4e0a&#xff08;\u5373A::func\u7684val&#061;1&#xff09;&#xff1b;\u200b<\/span><\/li>\n<\/ul>\n<ul>\n<li>\u56e0\u6b64&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u5c06p-&gt;func();\u89e3\u6790\u4e3ap-&gt;func(1);&#xff08;\u4f20\u5165\u57fa\u7c7b\u7684\u7f3a\u7701\u503c1&#xff09;&#xff0c;\u518d\u901a\u8fc7\u52a8\u6001\u7ed1\u5b9a\u627e\u5230B::func\u7684\u51fd\u6570\u4f53&#xff0c;\u6700\u7ec8\u8f93\u51faB-&gt;1\u3002\u200b<\/li>\n<\/ul>\n<p>3. \u7b2c\u4e09\u6b65&#xff1a;this \u6307\u9488\u7684\u4f5c\u7528 \u2014\u2014 \u786e\u4fdd\u51fd\u6570\u4f53\u4e0e\u5bf9\u8c61\u5339\u914d\u200b<\/p>\n<p>\u00a0\u201ctest\u51fd\u6570\u91cc\u9762\u5176\u5b9e\u6709\u4e2athis\u6307\u9488\u7684\u5f62\u53c2\u201d&#xff0c;\u8fd9\u4e00\u70b9\u662f\u7406\u89e3 \u201c\u51fd\u6570\u4f53\u5f52\u5c5e\u201d \u7684\u5173\u952e&#xff1a;\u200b<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u975e\u9759\u6001\u6210\u5458\u51fd\u6570&#xff08;\u5305\u62ec\u865a\u51fd\u6570&#xff09;\u90fd\u9690\u542b\u4e00\u4e2athis\u6307\u9488\u5f62\u53c2&#xff0c;\u5176\u7c7b\u578b\u4e3a \u201c\u5f53\u524d\u7c7b\u7684\u6307\u9488\u201d&#xff08;\u5982A::func\u7684this\u662fA*&#xff0c;B::func\u7684this\u662fB*&#xff09;&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li><span style=\"color:#fe2c24\">\u5f53\u8c03\u7528p-&gt;func();\u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5c06p\u7684\u5730\u5740\u4f5c\u4e3athis\u6307\u9488\u4f20\u5165\u51fd\u6570\u4f53 \u2014\u2014 \u7531\u4e8ep\u6307\u5411B\u7c7b\u5bf9\u8c61&#xff0c;this\u6307\u9488\u7684\u52a8\u6001\u7c7b\u578b\u662fB*&#xff0c;\u56e0\u6b64\u51fd\u6570\u4f53\u4e2d\u8bbf\u95ee\u7684\u662fB\u7c7b\u7684\u6210\u5458&#xff08;\u6b64\u5904\u65e0\u989d\u5916\u6210\u5458&#xff0c;\u4f46\u51fd\u6570\u4f53\u672c\u8eab\u662fB\u7c7b\u7684\u5b9e\u73b0&#xff09;&#xff1b;\u200b<\/span><\/li>\n<\/ul>\n<ul>\n<li>\u8fd9\u4e00\u6b65\u786e\u4fdd\u4e86 \u201c\u5373\u4fbf\u4f7f\u7528\u57fa\u7c7b\u7684\u7f3a\u7701\u503c&#xff0c;\u6267\u884c\u7684\u4ecd\u662f\u6d3e\u751f\u7c7b\u5bf9\u8c61\u5bf9\u5e94\u7684\u51fd\u6570\u4f53\u201d&#xff0c;\u5373 \u201c\u591a\u6001\u7684\u6761\u4ef6\u5b8c\u7f8e\u6ee1\u8db3\u201d\u2014\u2014this\u6307\u9488\u662f\u8fde\u63a5 \u201c\u9759\u6001\u7f3a\u7701\u503c\u201d \u4e0e \u201c\u52a8\u6001\u51fd\u6570\u4f53\u201d \u7684\u6865\u6881\u3002\u200b<\/li>\n<\/ul>\n<p>C&#043;&#043; \u6807\u51c6\u7684\u660e\u786e\u89c4\u5b9a&#xff1a;\u4e3a\u4ec0\u4e48\u8981\u8fd9\u6837\u8bbe\u8ba1&#xff1f;\u200b<\/p>\n<p>\u8fd9\u4e00\u73b0\u8c61\u5e76\u975e\u7f16\u8bd1\u5668\u6f0f\u6d1e&#xff0c;\u800c\u662f C&#043;&#043; \u6807\u51c6\u7684\u523b\u610f\u8bbe\u8ba1&#xff0c;\u6838\u5fc3\u539f\u56e0\u662f \u201c\u4fdd\u8bc1\u7f3a\u7701\u503c\u7684\u9759\u6001\u786e\u5b9a\u6027&#xff0c;\u907f\u514d\u8fd0\u884c\u65f6\u6b67\u4e49\u201d&#xff1a;\u200b<\/p>\n<ul>\n<li>\u82e5\u5141\u8bb8\u7f3a\u7701\u503c\u968f\u52a8\u6001\u7c7b\u578b\u53d8\u5316&#xff0c;\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u9636\u6bb5\u65e0\u6cd5\u786e\u5b9a\u7f3a\u7701\u503c&#xff08;\u9700\u7b49\u5230\u8fd0\u884c\u65f6\u624d\u77e5\u9053\u5bf9\u8c61\u7c7b\u578b&#xff09;&#xff0c;\u4f1a\u5bfc\u81f4 \u201c\u51fd\u6570\u8c03\u7528\u7684\u53c2\u6570\u4e2a\u6570 \/ \u503c\u201d \u65e0\u6cd5\u5728\u7f16\u8bd1\u65f6\u6821\u9a8c&#xff0c;\u589e\u52a0\u7a0b\u5e8f\u9519\u8bef\u98ce\u9669&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u4f8b\u5982&#xff1a;\u82e5\u57fa\u7c7bfunc\u7f3a\u7701\u503c\u4e3aint\u7c7b\u578b&#xff0c;\u6d3e\u751f\u7c7bfunc\u7f3a\u7701\u503c\u4e3adouble\u7c7b\u578b&#xff0c;\u7f16\u8bd1\u65f6\u65e0\u6cd5\u786e\u5b9a\u53c2\u6570\u7c7b\u578b&#xff0c;\u4f1a\u5bfc\u81f4\u51fd\u6570\u7b7e\u540d\u4e0d\u5339\u914d&#xff0c;\u5f15\u53d1\u8c03\u7528\u9519\u8bef&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u56e0\u6b64&#xff0c;\u6807\u51c6\u89c4\u5b9a \u201c\u865a\u51fd\u6570\u7684\u7f3a\u7701\u503c\u7ed1\u5b9a\u5230\u57fa\u7c7b\u58f0\u660e\u201d&#xff0c;\u65e2\u4fdd\u8bc1\u4e86\u7f16\u8bd1\u65f6\u7684\u53c2\u6570\u786e\u5b9a\u6027&#xff0c;\u53c8\u901a\u8fc7\u52a8\u6001\u7ed1\u5b9a\u4fdd\u7559\u4e86\u51fd\u6570\u4f53\u7684\u591a\u6001\u6027 \u2014\u2014 \u4ee3\u4ef7\u662f \u201c\u5b50\u7c7b\u7f3a\u7701\u503c\u88ab\u5ffd\u7565\u201d&#xff0c;\u8fd9\u4e5f\u662f\u5f00\u53d1\u8005\u9700\u8981\u89c4\u907f\u7684\u5751\u3002\u200b<\/li>\n<\/ul>\n<p>\u5173\u952e\u7ed3\u8bba\u4e0e\u907f\u5751\u5efa\u8bae\u200b<\/p>\n<li>\u6838\u5fc3\u7ed3\u8bba&#xff1a;\u591a\u6001\u8c03\u7528\u865a\u51fd\u6570\u65f6&#xff0c;\u9075\u5faa \u201c\u51fd\u6570\u4f53\u52a8\u6001\u7ed1\u5b9a&#xff08;\u6309\u5bf9\u8c61\u5b9e\u9645\u7c7b\u578b&#xff09;&#xff0c;\u7f3a\u7701\u503c\u9759\u6001\u7ed1\u5b9a&#xff08;\u6309\u57fa\u7c7b\u58f0\u660e&#xff09;\u201d \u7684\u89c4\u5219&#xff0c;\u5373 \u201c\u5b50\u7c7b\u51fd\u6570\u4f53 &#043; \u7236\u7c7b\u7f3a\u7701\u503c\u201d \u662f\u6807\u51c6\u884c\u4e3a&#xff1b;\u200b<\/li>\n<li>\u907f\u5751\u5efa\u8bae&#xff1a;\u200b<\/li>\n<ul>\n<li>\u91cd\u5199\u865a\u51fd\u6570\u65f6&#xff0c;\u52a1\u5fc5\u8ba9\u6d3e\u751f\u7c7b\u4e0e\u57fa\u7c7b\u7684\u7f3a\u7701\u503c\u4fdd\u6301\u4e00\u81f4&#xff08;\u5982\u5747\u8bbe\u4e3aval&#061;1&#xff09;&#xff0c;\u907f\u514d\u56e0\u7f3a\u7701\u503c\u5dee\u5f02\u5bfc\u81f4\u903b\u8f91\u9519\u8bef&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u82e5\u9700\u4e0d\u540c\u7684\u53c2\u6570\u9ed8\u8ba4\u503c&#xff0c;\u5efa\u8bae\u901a\u8fc7 \u201c\u663e\u5f0f\u4f20\u53c2\u201d \u5b9e\u73b0&#xff08;\u5982p-&gt;func(0);&#xff09;&#xff0c;\u800c\u975e\u4f9d\u8d56\u7f3a\u7701\u503c \u2014\u2014 \u663e\u5f0f\u4f20\u53c2\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e\u7f3a\u7701\u503c&#xff0c;\u53ef\u8986\u76d6\u9759\u6001\u7ed1\u5b9a\u7684\u57fa\u7c7b\u7f3a\u7701\u503c&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u5c3d\u91cf\u907f\u514d\u5728\u865a\u51fd\u6570\u4e2d\u4f7f\u7528\u7f3a\u7701\u503c&#xff0c;\u82e5\u5fc5\u987b\u4f7f\u7528&#xff0c;\u901a\u8fc7\u6ce8\u91ca\u660e\u786e \u201c\u7f3a\u7701\u503c\u4ee5\u57fa\u7c7b\u4e3a\u51c6\u201d&#xff0c;\u63d0\u9192\u540e\u7eed\u7ef4\u62a4\u8005\u3002\u200b<\/li>\n<\/ul>\n<p>\u6269\u5c55\u9a8c\u8bc1&#xff1a;\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff0c;\u7ed3\u679c\u662f\u5426\u4e00\u81f4&#xff1f;\u200b<\/p>\n<p>\u5c06main\u51fd\u6570\u4e2d\u7684\u6307\u9488\u6539\u4e3a \u201c\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61\u201d&#xff08;\u66f4\u5178\u578b\u7684\u591a\u6001\u573a\u666f&#xff09;&#xff0c;\u4ee3\u7801\u5982\u4e0b&#xff1a;\u200b<\/p>\n<p>int main() {<br \/>\n    A* p &#061; new B(); \/\/ \u57fa\u7c7b\u6307\u9488p&#xff0c;\u52a8\u6001\u7c7b\u578b\u662fB*<br \/>\n    p-&gt;func(); \/\/ \u8c03\u7528\u865a\u51fd\u6570<br \/>\n    delete p;<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\u4ecd\u4e3aB-&gt;1\u2014\u2014 \u56e0\u4e3a&#xff1a;\u200b<\/p>\n<ul>\n<li>\u51fd\u6570\u4f53\u52a8\u6001\u7ed1\u5b9a&#xff1a;p\u7684\u52a8\u6001\u7c7b\u578b\u662fB*&#xff0c;\u6267\u884cB::func\u7684\u51fd\u6570\u4f53&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7f3a\u7701\u503c\u9759\u6001\u7ed1\u5b9a&#xff1a;p\u7684\u9759\u6001\u7c7b\u578b\u662fA*&#xff0c;\u7f16\u8bd1\u5668\u4ecd\u4f7f\u7528A::func\u7684\u7f3a\u7701\u503cval&#061;1&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u8fd9\u8fdb\u4e00\u6b65\u9a8c\u8bc1\u4e86 \u201c\u7f3a\u7701\u503c\u4e0e\u9759\u6001\u7c7b\u578b\u7ed1\u5b9a\u201d \u7684\u89c4\u5219&#xff0c;\u4e0e\u6307\u9488\u672c\u8eab\u662f\u57fa\u7c7b\u8fd8\u662f\u6d3e\u751f\u7c7b\u7c7b\u578b\u65e0\u5173\u3002\u200b<\/li>\n<\/ul>\n<p>\u6211\u7ed9\u5927\u5bb6\u4e00\u4e2a\u5927\u767d\u8bdd\u7248\u672c\u7684&#xff1a;<\/p>\n<p><span style=\"color:#fe2c24\">\u6211\u4eec\u521b\u5efa\u7684\u662fB\u7c7b\u7c7b\u578b\u7684\u6307\u9488\u53d8\u91cf&#xff0c;\u7136\u540efunc\u8fd9\u4e2a\u51fd\u6570\u662f\u6784\u6210\u91cd\u5199\u7684&#xff0c;\u4e5f\u5c31\u662f\u591a\u6001&#xff0c;\u6240\u4ee5\u8c03\u7528p\u7684test\u51fd\u6570&#xff0c;\u4e5f\u5c31\u662f\u76f8\u5f53\u4e8e\u8c03\u7528\u5b50\u7c7bB\u4e2d\u7684test\u51fd\u6570&#xff0c;\u800ctset\u51fd\u6570\u91cc\u9762\u5176\u5b9e\u662f\u6709\u4e2athis\u6307\u9488\u7684\u5f62\u53c2\u7684&#xff0c;\u867d\u7136\u660e\u9762\u4e0a\u770b\u8d77\u6765\u4ec0\u4e48\u90fd\u6ca1\u6709&#xff0c;\u6240\u4ee5\u5c31\u5b8c\u7f8e\u7684\u8fbe\u5230\u4e86\u591a\u6001\u7684\u6761\u4ef6&#xff0c;\u53c8\u56e0\u4e3ap\u662fB\u7c7b\u578b\u7684\u5bf9\u8c61&#xff0c;\u6240\u4ee5\u5c31\u4f1a\u8c03\u7528B\u7c7b\u91cc\u9762\u7684func\u51fd\u6570&#xff0c;\u6240\u4ee5\u5c31\u6709B-&gt;\u8fd9\u4e2a\u8868\u8fbe\u51fa\u6765&#xff0c;<\/span><span style=\"color:#be191c\">\u4f46\u662f\u5462&#xff0c;\u5374\u4e0d\u662f\u7528\u5b50\u7c7bB\u4e2dfunc\u51fd\u6570\u7684\u7f3a\u7701\u503cval &#061; 0&#xff0c;\u800c\u662f\u7528\u7236\u7c7bA\u4e2d\u7684func\u51fd\u6570\u7684\u7f3a\u7701\u503cval &#061; 1&#xff0c;\u5176\u5b9e\u8fd9\u662fC&#043;&#043;\u7684\u4e00\u4e2a\u89c4\u5b9a&#xff0c;\u5c31\u662f\u591a\u6001\u65f6&#xff0c;\u662f\u7528\u7236\u7c7b\u865a\u51fd\u6570\u7684\u58f0\u660e&#xff0c;\u5373\u5f62\u53c2&#xff0c;\u52a0\u4e0a\u5b50\u7c7b\u7684\u76f8\u540c\u865a\u51fd\u6570\u7684\u51fd\u6570\u4f53&#xff0c;\u6240\u4ee5\u4e0a\u9762\u5c31\u662f\u7528\u5b50\u7c7bB\u7684func\u51fd\u6570\u7684\u51fd\u6570\u4f53&#xff0c;\u7136\u540e\u52a0\u4e0a\u7236\u7c7bA\u7684func\u51fd\u6570\u7684\u5f62\u53c2&#xff0c;\u6240\u4ee5\u6700\u540e\u7ed3\u679c\u662fB-&gt;1<\/span><\/p>\n<p>\u5927\u5bb6\u53ef\u5f97\u7406\u89e3\u597d\u4e86&#xff0c;\u8fd9\u9898\u4e4b\u524d\u817e\u8baf\u7b14\u8bd5&#xff0c;\u9762\u8bd5\u4e2d\u4e5f\u90fd\u6709\u6240\u63d0\u53ca\u3002<\/p>\n<h3>\u865a\u51fd\u6570\u91cd\u5199\u7684\u4e00\u4e9b\u5176\u4ed6\u95ee\u9898&#xff1a;<\/h3>\n<h4>\u534f\u53d8&#xff1a;<\/h4>\n<p>\u534f\u53d8\u662f C&#043;&#043; \u865a\u51fd\u6570\u91cd\u5199\u89c4\u5219\u4e2d\u7684\u4e00\u79cd\u7279\u6b8a\u4f8b\u5916\u60c5\u51b5&#xff0c;\u5b83\u6253\u7834\u4e86 \u201c\u8fd4\u56de\u503c\u7c7b\u578b\u5fc5\u987b\u5b8c\u5168\u4e00\u81f4\u201d \u7684\u5e38\u89c4\u8981\u6c42&#xff0c;\u4f46\u6709\u4e25\u683c\u7684\u9002\u7528\u8303\u56f4\u548c\u7ea6\u675f\u6761\u4ef6&#xff0c;\u7531\u4e8e\u5b9e\u9645\u7f16\u7a0b\u4e2d\u5e94\u7528\u573a\u666f\u8f83\u5c11&#xff0c;\u901a\u5e38\u4f5c\u4e3a\u4e86\u89e3\u5185\u5bb9\u5373\u53ef\u3002\u4ee5\u4e0b\u4ece \u201c\u534f\u53d8\u7684\u6838\u5fc3\u5b9a\u4e49\u2192\u9002\u7528\u6761\u4ef6\u62c6\u89e3\u2192\u5e95\u5c42\u903b\u8f91\u2192\u793a\u4f8b\u9a8c\u8bc1\u2192\u5b9e\u9645\u610f\u4e49\u201d \u4e94\u4e2a\u5c42\u9762\u5c55\u5f00\u8be6\u7ec6\u5206\u6790&#xff1a;\u200b<\/p>\n<p>\u4e00\u3001\u534f\u53d8\u7684\u6838\u5fc3\u5b9a\u4e49&#xff1a;\u91cd\u5199\u89c4\u5219\u7684 \u201c\u7279\u6b8a\u4f8b\u5916\u201d\u200b<\/p>\n<p>\u5728\u865a\u51fd\u6570\u91cd\u5199\u7684\u5e38\u89c4\u89c4\u5219\u4e2d&#xff0c;\u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u5fc5\u987b\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u6ee1\u8db3 \u201c\u4e09\u540c\u201d&#xff08;\u51fd\u6570\u540d\u3001\u53c2\u6570\u5217\u8868\u3001\u8fd4\u56de\u503c\u7c7b\u578b\u5b8c\u5168\u4e00\u81f4&#xff09;&#xff0c;\u800c\u534f\u53d8\u662f\u552f\u4e00\u5141\u8bb8\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c\u7684\u7279\u6b8a\u60c5\u51b5&#xff0c;\u5176\u6838\u5fc3\u5b9a\u4e49\u4e3a&#xff1a;\u200b<\/p>\n<p><span style=\"color:#fe2c24\">\u82e5\u57fa\u7c7b\u865a\u51fd\u6570\u8fd4\u56de\u7684\u662f \u201c\u57fa\u7c7b\u5bf9\u8c61\u7684\u6307\u9488\u6216\u5f15\u7528\u201d&#xff0c;\u5219\u6d3e\u751f\u7c7b\u5728\u91cd\u5199\u8be5\u865a\u51fd\u6570\u65f6&#xff0c;\u53ef\u8fd4\u56de \u201c\u6d3e\u751f\u7c7b\u5bf9\u8c61\u7684\u6307\u9488\u6216\u5f15\u7528\u201d&#xff08;\u4e14\u6d3e\u751f\u7c7b\u9700\u662f\u57fa\u7c7b\u7684\u76f4\u63a5 \/ \u95f4\u63a5\u5b50\u7c7b&#xff0c;\u7b26\u5408\u7ee7\u627f\u5173\u7cfb&#xff09;&#xff0c;\u8fd9\u79cd\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u91cd\u5199\u573a\u666f&#xff0c;\u79f0\u4e3a\u534f\u53d8\u3002\u200b<\/span><\/p>\n<p><span style=\"color:#fe2c24\">\u7b80\u5355\u6765\u8bf4&#xff0c;\u534f\u53d8\u7684\u672c\u8d28\u662f \u201c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u7236\u5b50\u517c\u5bb9\u66ff\u4ee3\u201d\u2014\u2014 \u7528\u6d3e\u751f\u7c7b\u7684\u6307\u9488 \/ \u5f15\u7528&#xff0c;\u66ff\u4ee3\u57fa\u7c7b\u7684\u6307\u9488 \/ \u5f15\u7528\u4f5c\u4e3a\u8fd4\u56de\u503c&#xff0c;\u4e14\u4e0d\u7834\u574f\u865a\u51fd\u6570\u91cd\u5199\u7684\u591a\u6001\u7279\u6027\u3002\u200b<\/span><\/p>\n<p>\u4e8c\u3001\u534f\u53d8\u7684\u4e25\u683c\u9002\u7528\u6761\u4ef6&#xff1a;\u7f3a\u4e00\u4e0d\u53ef\u200b<\/p>\n<p>\u534f\u53d8\u5e76\u975e \u201c\u4efb\u610f\u8fd4\u56de\u503c\u4e0d\u540c\u90fd\u5141\u8bb8\u201d&#xff0c;\u800c\u662f\u6709\u4e09\u4e2a\u5fc5\u987b\u540c\u65f6\u6ee1\u8db3\u7684\u786c\u6027\u6761\u4ef6&#xff0c;\u4e00\u65e6\u8fdd\u80cc\u5219\u4e0d\u6784\u6210\u91cd\u5199&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u76f4\u63a5\u62a5\u9519&#xff1a;\u200b<\/p>\n<p>1. \u6761\u4ef6\u4e00&#xff1a;\u57fa\u7c7b\u4e0e\u6d3e\u751f\u7c7b\u7684\u8fd4\u56de\u503c\u7c7b\u578b&#xff0c;\u5fc5\u987b\u662f \u201c\u6307\u9488\u6216\u5f15\u7528\u201d\u200b<\/p>\n<p>\u8fd9\u662f\u534f\u53d8\u7684\u6838\u5fc3\u524d\u63d0 \u2014\u2014\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u80fd\u662f\u503c\u7c7b\u578b&#xff0c;\u53ea\u80fd\u662f\u6307\u9488\u6216\u5f15\u7528\u3002\u200b<\/p>\n<ul>\n<li>\u5141\u8bb8\u7684\u60c5\u51b5&#xff1a;\u57fa\u7c7b\u8fd4\u56deBase*&#xff08;\u57fa\u7c7b\u6307\u9488&#xff09;&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deDerived*&#xff08;\u6d3e\u751f\u7c7b\u6307\u9488&#xff09;&#xff1b;\u57fa\u7c7b\u8fd4\u56deBase&amp;&#xff08;\u57fa\u7c7b\u5f15\u7528&#xff09;&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deDerived&amp;&#xff08;\u6d3e\u751f\u7c7b\u5f15\u7528&#xff09;&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7981\u6b62\u7684\u60c5\u51b5&#xff1a;\u57fa\u7c7b\u8fd4\u56deBase&#xff08;\u57fa\u7c7b\u503c\u7c7b\u578b&#xff09;&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deDerived&#xff08;\u6d3e\u751f\u7c7b\u503c\u7c7b\u578b&#xff09;\u2014\u2014 \u503c\u7c7b\u578b\u8fd4\u56de\u65f6\u4f1a\u89e6\u53d1 \u201c\u5207\u7247\u201d&#xff08;\u6d3e\u751f\u7c7b\u5bf9\u8c61\u8d4b\u503c\u7ed9\u57fa\u7c7b\u65f6\u4e22\u5931\u5b50\u7c7b\u6210\u5458&#xff09;&#xff0c;\u4e14\u503c\u7c7b\u578b\u7684\u5185\u5b58\u5927\u5c0f\u3001\u5e03\u5c40\u53ef\u80fd\u4e0d\u540c&#xff0c;\u65e0\u6cd5\u5b89\u5168\u517c\u5bb9&#xff0c;\u56e0\u6b64\u7f16\u8bd1\u5668\u7981\u6b62\u3002\u200b<\/li>\n<\/ul>\n<p>2. \u6761\u4ef6\u4e8c&#xff1a;\u8fd4\u56de\u503c\u7684\u6307\u9488 \/ \u5f15\u7528\u7c7b\u578b&#xff0c;\u5fc5\u987b\u7b26\u5408 \u201c\u7ee7\u627f\u5173\u7cfb\u201d\u200b<\/p>\n<p>\u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u8fd4\u56de\u7684 \u201c\u6d3e\u751f\u7c7b\u6307\u9488 \/ \u5f15\u7528\u201d&#xff0c;\u5176\u6307\u5411\u7684\u7c7b&#xff08;\u5373Derived&#xff09;\u5fc5\u987b\u662f\u57fa\u7c7b\u865a\u51fd\u6570\u8fd4\u56de\u7684 \u201c\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u201d \u6307\u5411\u7684\u7c7b&#xff08;\u5373Base&#xff09;\u7684\u76f4\u63a5\u6216\u95f4\u63a5\u5b50\u7c7b&#xff0c;\u5f62\u6210\u4e25\u683c\u7684\u7236\u5b50\u7ee7\u627f\u5173\u7cfb\u3002\u200b<\/p>\n<ul>\n<li>\u5141\u8bb8\u7684\u60c5\u51b5&#xff1a;\u57fa\u7c7b\u8fd4\u56dePerson*&#xff08;\u57fa\u7c7bPerson&#xff09;&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deStudent*&#xff08;\u6d3e\u751f\u7c7bStudent&#xff0c;\u7ee7\u627fPerson&#xff09;&#xff1b;\u200b<\/li>\n<\/ul>\n<ul>\n<li>\u7981\u6b62\u7684\u60c5\u51b5&#xff1a;\u57fa\u7c7b\u8fd4\u56dePerson*&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deCar*&#xff08;Car\u4e0ePerson\u65e0\u7ee7\u627f\u5173\u7cfb&#xff09;\u2014\u2014 \u65e0\u7ee7\u627f\u5173\u7cfb\u7684\u6307\u9488 \/ \u5f15\u7528\u65e0\u6cd5\u517c\u5bb9&#xff0c;\u4e0d\u6ee1\u8db3\u534f\u53d8\u8981\u6c42&#xff0c;\u7f16\u8bd1\u5668\u62a5\u9519\u3002\u200b<\/li>\n<\/ul>\n<p>3. \u6761\u4ef6\u4e09&#xff1a;\u8fd4\u56de\u7684\u6307\u9488 \/ \u5f15\u7528\u7c7b\u578b&#xff0c;\u5fc5\u987b\u662f \u201c\u5b8c\u6574\u7c7b\u578b\u201d\u200b<\/p>\n<p>\u534f\u53d8\u8981\u6c42\u8fd4\u56de\u7684\u6307\u9488 \/ \u5f15\u7528\u6240\u6307\u5411\u7684\u7c7b&#xff08;Base\u548cDerived&#xff09;\u5fc5\u987b\u662f \u201c\u5b8c\u6574\u7c7b\u578b\u201d\u2014\u2014 \u5373\u7c7b\u5df2\u63d0\u524d\u58f0\u660e\u5e76\u5b9a\u4e49&#xff08;\u81f3\u5c11\u5305\u542b\u7c7b\u4f53&#xff09;&#xff0c;\u4e0d\u80fd\u662f \u201c\u4e0d\u5b8c\u5168\u7c7b\u578b\u201d&#xff08;\u4ec5\u58f0\u660e\u672a\u5b9a\u4e49&#xff09;\u3002\u200b<\/p>\n<ul>\n<li>\u7981\u6b62\u7684\u60c5\u51b5&#xff1a;\u200b<\/li>\n<\/ul>\n<p>class Person; \/\/ \u4ec5\u58f0\u660e&#xff0c;\u672a\u5b9a\u4e49&#xff0c;\u5c5e\u4e8e\u201c\u4e0d\u5b8c\u5168\u7c7b\u578b\u201d<br \/>\nclass Student : public Person {}; \/\/ \u867d\u7ee7\u627f&#xff0c;\u4f46Person\u672a\u5b9a\u4e49<\/p>\n<p>class Base {<br \/>\npublic:<br \/>\n    \/\/ \u9519\u8bef&#xff1a;\u8fd4\u56de\u4e0d\u5b8c\u5168\u7c7b\u578bPerson\u7684\u6307\u9488&#xff0c;\u65e0\u6cd5\u6784\u6210\u534f\u53d8<br \/>\n    virtual Person* create() {}<br \/>\n};<\/p>\n<p>\u539f\u56e0&#xff1a;\u7f16\u8bd1\u5668\u9700\u8981\u77e5\u9053\u7c7b\u7684\u5185\u5b58\u5e03\u5c40&#xff08;\u5982\u6210\u5458\u5927\u5c0f\u3001\u865a\u8868\u4f4d\u7f6e&#xff09;&#xff0c;\u624d\u80fd\u751f\u6210\u6b63\u786e\u7684\u865a\u51fd\u6570\u8c03\u7528\u903b\u8f91&#xff0c;\u4e0d\u5b8c\u5168\u7c7b\u578b\u65e0\u6cd5\u63d0\u4f9b\u8fd9\u4e9b\u4fe1\u606f&#xff0c;\u56e0\u6b64\u7981\u6b62\u4f5c\u4e3a\u534f\u53d8\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u3002\u200b<\/p>\n<p>\u4e09\u3001\u534f\u53d8\u7684\u5e95\u5c42\u5408\u7406\u6027&#xff1a;\u4e3a\u4ec0\u4e48\u5141\u8bb8 \u201c\u6307\u9488 \/ \u5f15\u7528\u66ff\u4ee3\u201d&#xff1f;\u200b<\/p>\n<p>\u534f\u53d8\u4e4b\u6240\u4ee5\u88ab C&#043;&#043; \u6807\u51c6\u5141\u8bb8&#xff0c;\u6838\u5fc3\u539f\u56e0\u662f \u201c\u7236\u5b50\u7c7b\u6307\u9488 \/ \u5f15\u7528\u7684\u5185\u5b58\u517c\u5bb9\u6027\u201d\u2014\u2014 \u65e0\u8bba\u57fa\u7c7b\u8fd8\u662f\u6d3e\u751f\u7c7b\u7684\u6307\u9488&#xff0c;\u5728\u540c\u4e00\u5e73\u53f0\u4e0b\u7684\u5185\u5b58\u5927\u5c0f\u5b8c\u5168\u4e00\u81f4&#xff08;\u5982 32 \u4f4d\u7cfb\u7edf 4 \u5b57\u8282&#xff0c;64 \u4f4d\u7cfb\u7edf 8 \u5b57\u8282&#xff09;&#xff1b;\u5f15\u7528\u7684\u5e95\u5c42\u5b9e\u73b0\u672c\u8d28\u662f\u6307\u9488&#xff0c;\u56e0\u6b64\u4e5f\u5177\u5907\u76f8\u540c\u7684\u5185\u5b58\u517c\u5bb9\u6027&#xff0c;\u5177\u4f53\u903b\u8f91\u5982\u4e0b&#xff1a;\u200b<\/p>\n<p>1. \u6307\u9488\u7684\u5185\u5b58\u517c\u5bb9\u6027\u200b<\/p>\n<p>\u4ee5 64 \u4f4d\u7cfb\u7edf\u4e3a\u4f8b&#xff0c;Base*&#xff08;\u57fa\u7c7b\u6307\u9488&#xff09;\u548cDerived*&#xff08;\u6d3e\u751f\u7c7b\u6307\u9488&#xff09;\u7684\u5927\u5c0f\u5747\u4e3a 8 \u5b57\u8282&#xff0c;\u5b58\u50a8\u7684\u90fd\u662f\u5185\u5b58\u5730\u5740\u3002\u5f53\u6d3e\u751f\u7c7b\u865a\u51fd\u6570\u8fd4\u56deDerived*\u65f6&#xff0c;\u8be5\u5730\u5740\u53ef\u76f4\u63a5\u9690\u5f0f\u8f6c\u6362\u4e3aBase*&#xff08;\u7b26\u5408\u7ee7\u627f\u7684\u7c7b\u578b\u517c\u5bb9\u6027\u89c4\u5219&#xff09;&#xff0c;\u8c03\u7528\u8005\u63a5\u6536\u65f6\u65e0\u9700\u989d\u5916\u5904\u7406\u5185\u5b58\u683c\u5f0f&#xff0c;\u4e0d\u4f1a\u51fa\u73b0\u6570\u636e\u9519\u8bef\u3002\u200b<\/p>\n<p>\u4f8b\u5982&#xff1a;\u200b<\/p>\n<p>class Base {};<br \/>\nclass Derived : public Base {};<br \/>\nBase* func() {<br \/>\n    Derived* d &#061; new Derived();<br \/>\n    return d; \/\/ Derived*\u9690\u5f0f\u8f6c\u6362\u4e3aBase*&#xff0c;\u5730\u5740\u503c\u4e0d\u53d8&#xff0c;\u5185\u5b58\u5b89\u5168<br \/>\n}<\/p>\n<p>2. \u5f15\u7528\u7684\u5185\u5b58\u517c\u5bb9\u6027\u200b<\/p>\n<p>\u5f15\u7528\u662f \u201c\u53d8\u91cf\u7684\u522b\u540d\u201d&#xff0c;\u5e95\u5c42\u901a\u8fc7\u6307\u9488\u5b9e\u73b0&#xff08;\u5360\u7528\u4e0e\u6307\u9488\u76f8\u540c\u7684\u5185\u5b58\u7a7a\u95f4&#xff09;\u3002\u5f53\u57fa\u7c7b\u865a\u51fd\u6570\u8fd4\u56deBase&amp;&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56deDerived&amp;\u65f6&#xff0c;\u672c\u8d28\u662f\u8fd4\u56de \u201c\u6d3e\u751f\u7c7b\u5bf9\u8c61\u7684\u5730\u5740\u522b\u540d\u201d&#xff0c;\u8be5\u5730\u5740\u53ef\u5b89\u5168\u8f6c\u6362\u4e3a\u57fa\u7c7b\u5f15\u7528\u7684\u5e95\u5c42\u6307\u9488&#xff0c;\u8c03\u7528\u8005\u8bbf\u95ee\u65f6\u80fd\u901a\u8fc7\u5f15\u7528\u7684\u52a8\u6001\u7c7b\u578b&#xff08;\u5b9e\u9645\u5bf9\u8c61\u7c7b\u578b&#xff09;\u6b63\u786e\u64cd\u4f5c\u6210\u5458&#xff0c;\u4e0d\u7834\u574f\u591a\u6001\u3002\u200b<\/p>\n<p>\u56db\u3001\u534f\u53d8\u7684\u793a\u4f8b\u9a8c\u8bc1&#xff1a;\u6b63\u786e\u4e0e\u9519\u8bef\u573a\u666f\u5bf9\u6bd4\u200b<\/p>\n<p>\u901a\u8fc7\u5177\u4f53\u4ee3\u7801\u793a\u4f8b&#xff0c;\u76f4\u89c2\u7406\u89e3\u534f\u53d8\u7684\u6b63\u786e\u7528\u6cd5\u548c\u9519\u8bef\u573a\u666f&#xff1a;\u200b<\/p>\n<p>1. \u6b63\u786e\u793a\u4f8b 1&#xff1a;\u6307\u9488\u7c7b\u578b\u7684\u534f\u53d8&#xff08;\u6700\u5e38\u89c1\u573a\u666f&#xff09;\u200b<\/p>\n<p>#include &lt;iostream&gt;<br \/>\nusing namespace std;<\/p>\n<p>\/\/ \u57fa\u7c7b&#xff1a;Animal<br \/>\nclass Animal {<br \/>\npublic:<br \/>\n    virtual void eat() { cout &lt;&lt; &#034;Animal eat&#034; &lt;&lt; endl; }<br \/>\n    \/\/ \u57fa\u7c7b\u865a\u51fd\u6570&#xff1a;\u8fd4\u56deAnimal*&#xff08;\u57fa\u7c7b\u6307\u9488&#xff09;<br \/>\n    virtual Animal* createAnimal() {<br \/>\n        cout &lt;&lt; &#034;Create Animal&#034; &lt;&lt; endl;<br \/>\n        return new Animal();<br \/>\n    }<br \/>\n    virtual ~Animal() {} \/\/ \u6790\u6784\u51fd\u6570\u8bbe\u4e3a\u865a\u51fd\u6570&#xff0c;\u786e\u4fdd\u591a\u6001\u91ca\u653e<br \/>\n};<\/p>\n<p>\/\/ \u6d3e\u751f\u7c7b&#xff1a;Cat&#xff08;\u7ee7\u627fAnimal&#xff09;<br \/>\nclass Cat : public Animal {<br \/>\npublic:<br \/>\n    void eat() override { cout &lt;&lt; &#034;Cat eat fish&#034; &lt;&lt; endl; }<br \/>\n    \/\/ \u6d3e\u751f\u7c7b\u865a\u51fd\u6570&#xff1a;\u8fd4\u56deCat*&#xff08;\u6d3e\u751f\u7c7b\u6307\u9488&#xff09;&#xff0c;\u7b26\u5408\u534f\u53d8\u6761\u4ef6<br \/>\n    Cat* createAnimal() override {<br \/>\n        cout &lt;&lt; &#034;Create Cat&#034; &lt;&lt; endl;<br \/>\n        return new Cat();<br \/>\n    }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    Animal* animalPtr &#061; new Cat(); \/\/ \u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61<br \/>\n    \/\/ \u591a\u6001\u8c03\u7528createAnimal&#xff1a;\u6267\u884cCat::createAnimal&#xff0c;\u8fd4\u56deCat*&#xff08;\u9690\u5f0f\u8f6c\u4e3aAnimal*&#xff09;<br \/>\n    Animal* newAnimal &#061; animalPtr-&gt;createAnimal();<br \/>\n    newAnimal-&gt;eat(); \/\/ \u591a\u6001\u8c03\u7528&#xff1a;\u8f93\u51fa\u201cCat eat fish\u201d<\/p>\n<p>    delete newAnimal;<br \/>\n    delete animalPtr;<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;\u200b<\/p>\n<p>Create Cat\u200b<\/p>\n<p>Cat eat fish\u200b<\/p>\n<ul>\n<li>\u5206\u6790&#xff1a;animalPtr\u7684\u52a8\u6001\u7c7b\u578b\u662fCat*&#xff0c;\u8c03\u7528createAnimal\u65f6\u6267\u884cCat\u7684\u91cd\u5199\u5b9e\u73b0&#xff08;\u4f53\u73b0\u591a\u6001&#xff09;&#xff0c;\u8fd4\u56deCat*\u5e76\u9690\u5f0f\u8f6c\u4e3aAnimal*&#xff0c;\u6ee1\u8db3\u534f\u53d8\u89c4\u5219&#xff0c;\u903b\u8f91\u6b63\u786e\u3002\u200b<\/li>\n<\/ul>\n<p>2. \u6b63\u786e\u793a\u4f8b 2&#xff1a;\u5f15\u7528\u7c7b\u578b\u7684\u534f\u53d8\u200b<\/p>\n<p>class Base {<br \/>\npublic:<br \/>\n    virtual Base&amp; getSelf() {<br \/>\n        cout &lt;&lt; &#034;Base self&#034; &lt;&lt; endl;<br \/>\n        return *this;<br \/>\n    }<br \/>\n};<\/p>\n<p>class Derived : public Base {<br \/>\npublic:<br \/>\n    Derived&amp; getSelf() override {<br \/>\n        cout &lt;&lt; &#034;Derived self&#034; &lt;&lt; endl;<br \/>\n        return *this;<br \/>\n    }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    Derived d;<br \/>\n    Base&amp; baseRef &#061; d; \/\/ \u57fa\u7c7b\u5f15\u7528\u7ed1\u5b9a\u6d3e\u751f\u7c7b\u5bf9\u8c61<br \/>\n    baseRef.getSelf(); \/\/ \u591a\u6001\u8c03\u7528&#xff1a;\u8f93\u51fa\u201cDerived self\u201d<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;Derived self\u200b<\/p>\n<ul>\n<li>\u5206\u6790&#xff1a;baseRef\u7684\u52a8\u6001\u7c7b\u578b\u662fDerived&amp;&#xff0c;\u8c03\u7528getSelf\u65f6\u6267\u884cDerived\u7684\u91cd\u5199\u5b9e\u73b0&#xff0c;\u8fd4\u56deDerived&amp;\u5e76\u9690\u5f0f\u8f6c\u4e3aBase&amp;&#xff0c;\u7b26\u5408\u534f\u53d8\u89c4\u5219\u3002\u200b<\/li>\n<\/ul>\n<p>3. \u9519\u8bef\u793a\u4f8b&#xff1a;\u8fd4\u56de\u503c\u4e3a\u503c\u7c7b\u578b&#xff0c;\u4e0d\u6ee1\u8db3\u534f\u53d8\u200b<\/p>\n<p>class Base {};<br \/>\nclass Derived : public Base {};<\/p>\n<p>class A {<br \/>\npublic:<br \/>\n    \/\/ \u57fa\u7c7b\u865a\u51fd\u6570&#xff1a;\u8fd4\u56deBase&#xff08;\u503c\u7c7b\u578b&#xff09;<br \/>\n    virtual Base func() { return Base(); }<br \/>\n};<\/p>\n<p>class B : public A {<br \/>\npublic:<br \/>\n    \/\/ \u9519\u8bef&#xff1a;\u8fd4\u56de\u503c\u4e3aDerived&#xff08;\u503c\u7c7b\u578b&#xff09;&#xff0c;\u4e0d\u6ee1\u8db3\u534f\u53d8\u6761\u4ef6&#xff0c;\u7f16\u8bd1\u5668\u62a5\u9519<br \/>\n    virtual Derived func() override { return Derived(); }<br \/>\n};<\/p>\n<ul>\n<li>\u7f16\u8bd1\u5668\u62a5\u9519\u539f\u56e0&#xff1a;\u8fd4\u56de\u503c\u4e3a\u503c\u7c7b\u578b&#xff0c;\u65e0\u6cd5\u6784\u6210\u534f\u53d8&#xff0c;\u8fdd\u80cc\u91cd\u5199\u7684 \u201c\u4e09\u540c\u201d \u89c4\u5219&#xff08;\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c\u4e14\u975e\u534f\u53d8\u5141\u8bb8\u7684\u6307\u9488 \/ \u5f15\u7528&#xff09;\u3002\u200b<\/li>\n<\/ul>\n<p>\u4e94\u3001\u534f\u53d8\u7684\u5b9e\u9645\u610f\u4e49&#xff1a;\u5e94\u7528\u573a\u666f\u5c11&#xff0c;\u4ec5\u4f5c\u4e86\u89e3\u200b<\/p>\n<p>\u867d\u7136\u534f\u53d8\u662f C&#043;&#043; \u6807\u51c6\u652f\u6301\u7684\u91cd\u5199\u7279\u6b8a\u60c5\u51b5&#xff0c;\u4f46\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\u5e94\u7528\u573a\u666f\u6781\u5c11&#xff0c;\u6838\u5fc3\u539f\u56e0\u6709\u4e24\u70b9&#xff1a;\u200b<\/p>\n<li>\u9700\u6c42\u573a\u666f\u6709\u9650&#xff1a;\u5927\u90e8\u5206\u591a\u6001\u573a\u666f\u4e2d&#xff0c;\u865a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u65e0\u9700 \u201c\u7236\u5b50\u6307\u9488 \/ \u5f15\u7528\u66ff\u4ee3\u201d\u2014\u2014 \u4f8b\u5982 \u201c\u4e70\u7968\u201d\u201c\u53d1\u58f0\u201d \u7b49\u884c\u4e3a&#xff0c;\u8fd4\u56de\u503c\u591a\u4e3avoid\u6216\u57fa\u7840\u7c7b\u578b&#xff08;\u5982int&#xff09;&#xff0c;\u65e0\u9700\u8fd4\u56de\u7c7b\u5bf9\u8c61\u7684\u6307\u9488 \/ \u5f15\u7528&#xff1b;\u200b<\/li>\n<li>\u53ef\u88ab\u5176\u4ed6\u65b9\u5f0f\u66ff\u4ee3&#xff1a;\u5373\u4fbf\u9700\u8981\u8fd4\u56de\u7c7b\u5bf9\u8c61\u7684\u6307\u9488 \/ \u5f15\u7528&#xff0c;\u4e5f\u53ef\u901a\u8fc7 \u201c\u57fa\u7c7b\u6307\u9488\u8fd4\u56de\u6d3e\u751f\u7c7b\u5bf9\u8c61\u201d&#xff08;\u5e38\u89c4\u91cd\u5199&#xff0c;\u4e0d\u4f9d\u8d56\u534f\u53d8&#xff09;\u5b9e\u73b0&#xff0c;\u4f8b\u5982\u57fa\u7c7b\u865a\u51fd\u6570\u8fd4\u56deBase*&#xff0c;\u6d3e\u751f\u7c7b\u91cd\u5199\u65f6\u76f4\u63a5\u8fd4\u56denew Derived()&#xff08;Derived*\u9690\u5f0f\u8f6c\u4e3aBase*&#xff09;&#xff0c;\u65e0\u9700\u4e13\u95e8\u4f7f\u7528\u534f\u53d8&#xff1b;\u200b<\/li>\n<p>\u56e0\u6b64&#xff0c;\u534f\u53d8\u66f4\u591a\u662f C&#043;&#043; \u8bed\u6cd5\u7684 \u201c\u5b8c\u6574\u6027\u8865\u5145\u201d&#xff0c;\u800c\u975e\u9ad8\u9891\u5b9e\u7528\u7279\u6027&#xff0c;\u638c\u63e1\u5176\u5b9a\u4e49\u548c\u89c4\u5219\u5373\u53ef&#xff0c;\u65e0\u9700\u6df1\u5165\u5e94\u7528\u3002\u200b<\/p>\n<p>\u516d\u3001\u5173\u952e\u7ed3\u8bba&#xff1a;\u534f\u53d8\u7684\u6838\u5fc3\u8981\u70b9\u603b\u7ed3\u200b<\/p>\n<li>\u534f\u53d8\u662f\u865a\u51fd\u6570\u91cd\u5199\u7684\u7279\u6b8a\u4f8b\u5916&#xff0c;\u4ec5\u5141\u8bb8\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c&#xff0c;\u4e14\u5fc5\u987b\u662f \u201c\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u2192\u6d3e\u751f\u7c7b\u6307\u9488 \/ \u5f15\u7528\u201d&#xff1b;\u200b<\/li>\n<li>\u534f\u53d8\u7684\u4e09\u4e2a\u786c\u6027\u6761\u4ef6&#xff1a;\u8fd4\u56de\u503c\u4e3a\u6307\u9488 \/ \u5f15\u7528\u3001\u7b26\u5408\u7ee7\u627f\u5173\u7cfb\u3001\u7c7b\u578b\u4e3a\u5b8c\u6574\u7c7b\u578b&#xff1b;\u200b<\/li>\n<li>\u5e95\u5c42\u4f9d\u8d56\u7236\u5b50\u7c7b\u6307\u9488 \/ \u5f15\u7528\u7684\u5185\u5b58\u517c\u5bb9\u6027&#xff0c;\u786e\u4fdd\u8c03\u7528\u5b89\u5168&#xff1b;\u200b<\/li>\n<li>\u5b9e\u9645\u5e94\u7528\u573a\u666f\u5c11&#xff0c;\u4ec5\u4f5c\u4e86\u89e3&#xff0c;\u65e0\u9700\u4f18\u5148\u4f7f\u7528\u3002<\/li>\n<p>\u5927\u5bb6\u4ec5\u4f5c\u4e86\u89e3&#xff0c;\u4e0d\u5fc5\u592a\u5728\u4e4e\u3002<\/p>\n<h4>\u6790\u6784\u51fd\u6570\u7684\u91cd\u5199&#xff1a;<\/h4>\n<p>\u5728 C&#043;&#043; \u7ee7\u627f\u4f53\u7cfb\u4e2d&#xff0c;\u6790\u6784\u51fd\u6570\u7684\u865a\u51fd\u6570\u5904\u7406\u662f\u4e00\u4e2a\u7279\u6b8a\u4e14\u5173\u952e\u7684\u77e5\u8bc6\u70b9&#xff0c;\u76f4\u63a5\u5173\u7cfb\u5230\u5185\u5b58\u5b89\u5168&#xff0c;\u4e5f\u662f\u9762\u8bd5\u9ad8\u9891\u8003\u70b9\u3002\u4ee5\u4e0b\u4ece \u201c\u6790\u6784\u51fd\u6570\u91cd\u5199\u7684\u7279\u6b8a\u6027\u2192\u5185\u5b58\u6cc4\u6f0f\u98ce\u9669\u2192\u5e95\u5c42\u539f\u7406\u2192\u9762\u8bd5\u8003\u70b9\u201d \u56db\u4e2a\u5c42\u9762\u5c55\u5f00\u8be6\u7ec6\u5206\u6790&#xff1a;<\/p>\n<p>\u4e00\u3001\u865a\u6790\u6784\u51fd\u6570\u7684\u6838\u5fc3\u89c4\u5219&#xff1a;\u6790\u6784\u51fd\u6570\u91cd\u5199\u7684 \u201c\u7279\u6b8a\u60c5\u51b5\u201d<\/p>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b&#xff0c;\u865a\u51fd\u6570\u91cd\u5199\u8981\u6c42 \u201c\u51fd\u6570\u540d\u3001\u53c2\u6570\u5217\u8868\u3001\u8fd4\u56de\u503c\u7c7b\u578b\u5b8c\u5168\u4e00\u81f4\u201d&#xff08;\u534f\u53d8\u9664\u5916&#xff09;&#xff0c;\u4f46\u6790\u6784\u51fd\u6570\u7684\u91cd\u5199\u662f\u552f\u4e00\u4f8b\u5916 \u2014\u2014<span style=\"color:#fe2c24\">\u5f53\u57fa\u7c7b\u7684\u6790\u6784\u51fd\u6570\u88abvirtual\u5173\u952e\u5b57\u4fee\u9970\u65f6&#xff0c;\u6d3e\u751f\u7c7b\u7684\u6790\u6784\u51fd\u6570\u53ea\u8981\u5b9a\u4e49&#xff08;\u65e0\u8bba\u662f\u5426\u52a0virtual&#xff09;&#xff0c;\u90fd\u4f1a\u4e0e\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u6784\u6210\u91cd\u5199<\/span>&#xff0c;\u5177\u4f53\u89c4\u5219\u5982\u4e0b&#xff1a;<\/p>\n<p>1. \u6790\u6784\u51fd\u6570\u540d\u79f0\u7684 \u201c\u7f16\u8bd1\u5668\u7279\u6b8a\u5904\u7406\u201d<\/p>\n<p>\u8868\u9762\u4e0a\u770b&#xff0c;\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u540d\u4e3a~A()&#xff0c;\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u540d\u4e3a~B()&#xff0c;\u4e8c\u8005\u540d\u5b57\u4e0d\u540c&#xff0c;\u4f3c\u4e4e\u4e0d\u7b26\u5408\u91cd\u5199\u7684 \u201c\u51fd\u6570\u540d\u4e00\u81f4\u201d \u8981\u6c42\u3002\u4f46\u5b9e\u9645\u4e0a&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u5bf9\u6790\u6784\u51fd\u6570\u7684\u540d\u79f0\u505a\u7edf\u4e00\u7684\u5e95\u5c42\u5904\u7406&#xff1a;\u7f16\u8bd1\u540e\u6240\u6709\u7c7b\u7684\u6790\u6784\u51fd\u6570\u540d\u79f0\u90fd\u4f1a\u88ab\u66ff\u6362\u4e3adestructor&#xff08;\u4e0d\u540c\u7f16\u8bd1\u5668\u5e95\u5c42\u547d\u540d\u53ef\u80fd\u7565\u6709\u5dee\u5f02&#xff0c;\u5982_Zdtor1A&#xff0c;\u4f46\u6838\u5fc3\u662f \u201c\u7edf\u4e00\u6807\u8bc6\u201d&#xff09;\u3002<\/p>\n<p>\u8fd9\u610f\u5473\u7740&#xff1a;\u57fa\u7c7bA\u7684\u865a\u6790\u6784\u51fd\u6570&#xff08;virtual ~A()&#xff09;\u7f16\u8bd1\u540e\u4e3a \u201c\u865a\u51fd\u6570destructor\u201d&#xff0c;\u6d3e\u751f\u7c7bB\u7684\u6790\u6784\u51fd\u6570&#xff08;~B()&#xff09;\u7f16\u8bd1\u540e\u4e5f\u4e3a \u201c\u51fd\u6570destructor\u201d&#xff0c;\u4e8c\u8005\u6ee1\u8db3 \u201c\u51fd\u6570\u540d\u4e00\u81f4 &#043; \u57fa\u7c7b\u51fd\u6570\u4e3a\u865a\u51fd\u6570\u201d \u7684\u91cd\u5199\u524d\u63d0&#xff0c;\u56e0\u6b64\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u4f1a\u81ea\u52a8\u91cd\u5199\u57fa\u7c7b\u7684\u865a\u6790\u6784\u51fd\u6570 \u2014\u2014 \u5373\u4fbf\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u4e0d\u52a0virtual&#xff0c;\u4e5f\u4f1a\u56e0 \u201c\u7ee7\u627f\u57fa\u7c7b\u865a\u51fd\u6570\u5c5e\u6027\u201d \u548c \u201c\u540d\u79f0\u7edf\u4e00\u5904\u7406\u201d&#xff0c;\u6784\u6210\u5408\u6cd5\u91cd\u5199\u3002<\/p>\n<p>\u6240\u4ee5\u8fd9\u4e5f\u4e5f\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u4e0a\u7bc7\u535a\u5ba2\u8bb2\u7ee7\u627f\u7684\u65f6\u5019\u8bf4&#xff0c;\u60f3\u8981\u5728\u5b50\u7c7b\u7684\u6790\u6784\u51fd\u6570\u8c03\u7528\u7236\u7c7b\u7684\u6790\u6784\u51fd\u6570\u65f6&#xff0c;\u5fc5\u987b\u8981\u6307\u5b9a\u4e3a\u7236\u7c7b\u7684\u7c7b\u57df&#xff0c;\u8fd9\u6837\u5b50\u624d\u884c&#xff0c;\u867d\u7136\u8bf4\u5e76\u4e0d\u9700\u8981\u6211\u4eec\u5728\u5b50\u7c7b\u7684\u6790\u6784\u51fd\u6570\u4e2d\u8c03\u7528\u7236\u7c7b\u7684\u6790\u6784\u51fd\u6570\u3002<\/p>\n<p>2. \u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u7684virtual\u53ef\u7701\u7565&#xff08;\u4f46\u5efa\u8bae\u663e\u5f0f\u6dfb\u52a0&#xff09;<\/p>\n<p>\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u662f\u5426\u52a0virtual\u4e0d\u5f71\u54cd\u91cd\u5199\u6548\u679c&#xff1a;<\/p>\n<ul>\n<li>\u52a0virtual&#xff1a;\u660e\u786e\u6807\u6ce8\u4e3a\u865a\u51fd\u6570&#xff0c;\u4ee3\u7801\u53ef\u8bfb\u6027\u66f4\u9ad8&#xff0c;\u540e\u7eed\u82e5\u6709\u591a\u5c42\u7ee7\u627f&#xff08;\u5982C\u7ee7\u627fB&#xff09;&#xff0c;C\u7684\u6790\u6784\u51fd\u6570\u53ef\u7ee7\u7eed\u91cd\u5199&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u4e0d\u52a0virtual&#xff1a;\u56e0\u7ee7\u627f\u57fa\u7c7b\u865a\u6790\u6784\u51fd\u6570\u7684\u5c5e\u6027&#xff0c;\u4ecd\u4f1a\u88ab\u89c6\u4e3a\u865a\u51fd\u6570&#xff0c;\u4e0e\u57fa\u7c7b\u6784\u6210\u91cd\u5199\u3002<\/li>\n<\/ul>\n<p>\u4f46\u4ece\u4ee3\u7801\u89c4\u8303\u89d2\u5ea6&#xff0c;\u5efa\u8bae\u5728\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u524d\u663e\u5f0f\u6dfb\u52a0virtual&#xff0c;\u907f\u514d\u540e\u7eed\u7ef4\u62a4\u8005\u8bef\u5224\u5176\u662f\u5426\u4e3a\u865a\u51fd\u6570\u3002<\/p>\n<p>\u4e8c\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u865a\u6790\u6784\u51fd\u6570&#xff1f;\u2014\u2014 \u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u7684\u6838\u5fc3\u573a\u666f<\/p>\n<p>\u865a\u6790\u6784\u51fd\u6570\u7684\u6838\u5fc3\u4f5c\u7528 \u2014\u2014\u5f53\u7528\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff0c;\u5e76\u901a\u8fc7delete\u91ca\u653e\u65f6&#xff0c;\u786e\u4fdd\u6d3e\u751f\u7c7b\u7684\u6790\u6784\u51fd\u6570\u88ab\u8c03\u7528&#xff0c;\u907f\u514d\u6d3e\u751f\u7c7b\u4e2d\u7533\u8bf7\u7684\u8d44\u6e90\u672a\u91ca\u653e\u3002<\/p>\n<p>1. \u975e\u865a\u6790\u6784\u51fd\u6570\u7684\u5185\u5b58\u6cc4\u6f0f\u98ce\u9669&#xff08;\u53cd\u4f8b\u5206\u6790&#xff09;<\/p>\n<p>\u82e5\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570\u4e0d\u52a0virtual&#xff08;\u5373\u975e\u865a\u6790\u6784\u51fd\u6570&#xff09;&#xff0c;\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/p>\n<p>class A {<br \/>\npublic:<br \/>\n    ~A() { cout &lt;&lt; &#034;~A()&#034; &lt;&lt; endl; } \/\/ \u975e\u865a\u6790\u6784\u51fd\u6570<br \/>\n};<br \/>\nclass B : public A {<br \/>\npublic:<br \/>\n    ~B() {<br \/>\n        cout &lt;&lt; &#034;~B()-&gt;delete:&#034; &lt;&lt; _p &lt;&lt; endl;<br \/>\n        delete _p; \/\/ \u91ca\u653e\u6d3e\u751f\u7c7b\u7533\u8bf7\u7684int\u6570\u7ec4\u8d44\u6e90<br \/>\n    }<br \/>\nprotected:<br \/>\n    int* _p &#061; new int[10]; \/\/ \u6d3e\u751f\u7c7b\u5728\u5806\u4e0a\u7533\u8bf7\u7684\u8d44\u6e90<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    A* p2 &#061; new B(); \/\/ \u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61<br \/>\n    delete p2; \/\/ \u91ca\u653e\u5bf9\u8c61<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;\u4ec5\u8f93\u51fa~A()&#xff0c;\u672a\u8f93\u51fa~B()-&gt;delete:&#8230;<\/p>\n<ul>\n<li>\u95ee\u9898\u5206\u6790&#xff1a;<\/li>\n<\/ul>\n<li><span style=\"color:#fe2c24\">\u7531\u4e8e\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u975e\u865a\u51fd\u6570&#xff0c;delete p2\u65f6\u4f1a\u89e6\u53d1 \u201c\u9759\u6001\u7ed1\u5b9a\u201d\u2014\u2014 \u7f16\u8bd1\u5668\u6839\u636e\u6307\u9488p2\u7684\u9759\u6001\u7c7b\u578b&#xff08;A*&#xff09;&#xff0c;\u76f4\u63a5\u8c03\u7528\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570&#xff1b;\u5bf9\u4e8e\u8fd9\u4e00\u70b9&#xff0c;\u5927\u5bb6\u53ef\u80fd\u4e0d\u592a\u7406\u89e3&#xff0c;\u4f46\u662f\u7531\u4e8e\u5bf9\u8fd9\u4e00\u90e8\u5206\u7684\u89e3\u91ca\u8fd8\u9700\u8981\u540e\u9762\u7684\u77e5\u8bc6&#xff0c;\u6240\u4ee5\u6211\u4f1a\u653e\u5728\u4e0b\u4e00\u7bc7\u535a\u5ba2\u4e2d\u8fdb\u884c\u89e3\u91ca&#xff0c;\u5927\u5bb6\u770b\u5230\u8fd9\u91cc\u6709\u4e0d\u61c2\u7684\u53ef\u4ee5\u76f4\u63a5\u8df3\u5230\u4e0b\u4e00\u7bc7\u535a\u5ba2\u4e2d\u8fdb\u884c\u67e5\u770b\u3002<\/span><\/li>\n<li>\u6d3e\u751f\u7c7bB\u7684\u6790\u6784\u51fd\u6570\u672a\u88ab\u8c03\u7528&#xff0c;\u5bfc\u81f4B\u4e2dnew int[10]\u7533\u8bf7\u7684\u5806\u5185\u5b58&#xff08;_p\u6307\u5411\u7684\u7a7a\u95f4&#xff09;\u672a\u88ab\u91ca\u653e&#xff0c;\u9020\u6210\u5185\u5b58\u6cc4\u6f0f&#xff1b;<\/li>\n<li>\u82e5_p\u6307\u5411\u7684\u8d44\u6e90\u662f\u6587\u4ef6\u53e5\u67c4\u3001\u7f51\u7edc\u8fde\u63a5\u7b49&#xff0c;\u8fd8\u4f1a\u5bfc\u81f4\u8d44\u6e90\u6cc4\u6f0f&#xff0c;\u5f15\u53d1\u7a0b\u5e8f\u5f02\u5e38\u3002<\/li>\n<p>2. \u865a\u6790\u6784\u51fd\u6570\u7684\u6b63\u786e\u91ca\u653e&#xff08;\u4ee3\u7801\u793a\u4f8b\u5206\u6790&#xff09;<\/p>\n<p>\u5f53\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570\u52a0virtual\u540e&#xff08;\u5373virtual ~A()&#xff09;&#xff0c;\u4ee3\u7801\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b&#xff1a;<\/p>\n<p>\/\/ \u8fd0\u884c\u7ed3\u679c&#xff1a;<br \/>\n~B()-&gt;delete:0x00000123456789ab \/\/ \u5148\u8c03\u7528\u6d3e\u751f\u7c7bB\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u91ca\u653e_p\u8d44\u6e90<br \/>\n~A() \/\/ \u518d\u8c03\u7528\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u91ca\u653e\u57fa\u7c7b\u8d44\u6e90<\/p>\n<ul>\n<li>\u6b63\u786e\u91ca\u653e\u6d41\u7a0b&#xff1a;<\/li>\n<\/ul>\n<li>delete p2\u65f6&#xff0c;\u56e0\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u662f\u865a\u51fd\u6570&#xff0c;\u89e6\u53d1 \u201c\u52a8\u6001\u7ed1\u5b9a\u201d\u2014\u2014 \u7a0b\u5e8f\u6839\u636ep2\u7684\u52a8\u6001\u7c7b\u578b&#xff08;B*&#xff0c;\u5373\u5b9e\u9645\u6307\u5411\u7684B\u7c7b\u5bf9\u8c61&#xff09;&#xff0c;\u5148\u8c03\u7528\u6d3e\u751f\u7c7bB\u7684\u6790\u6784\u51fd\u6570&#xff1b;<\/li>\n<li>\u6d3e\u751f\u7c7bB\u7684\u6790\u6784\u51fd\u6570\u6267\u884c&#xff1a;\u91ca\u653e_p\u6307\u5411\u7684\u5806\u5185\u5b58&#xff08;delete _p&#xff09;&#xff0c;\u5b8c\u6210\u6d3e\u751f\u7c7b\u8d44\u6e90\u6e05\u7406&#xff1b;<\/li>\n<li>\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\u540e&#xff0c;\u81ea\u52a8\u8c03\u7528\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570&#xff08;\u7ee7\u627f\u4f53\u7cfb\u7684\u6790\u6784\u51fd\u6570\u8c03\u7528\u89c4\u5219&#xff1a;\u5148\u6d3e\u751f\u540e\u57fa\u7c7b&#xff09;&#xff0c;\u5b8c\u6210\u57fa\u7c7b\u8d44\u6e90\u6e05\u7406&#xff1b;<\/li>\n<li>\u6574\u4e2a\u8fc7\u7a0b\u65e0\u5185\u5b58\u6cc4\u6f0f&#xff0c;\u8d44\u6e90\u91ca\u653e\u5b8c\u6574\u3002<\/li>\n<p>3. \u5173\u952e\u7ed3\u8bba&#xff1a;\u865a\u6790\u6784\u51fd\u6570\u7684\u9002\u7528\u573a\u666f<\/p>\n<p>\u53ea\u6709\u5f53 \u201c\u7528\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff0c;\u5e76\u901a\u8fc7\u8be5\u6307\u9488 \/ \u5f15\u7528\u91ca\u653e\u5bf9\u8c61\u201d \u65f6&#xff0c;\u624d\u9700\u8981\u5c06\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u8bbe\u4e3a\u865a\u51fd\u6570\u3002\u82e5\u4e0d\u5b58\u5728 \u201c\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61\u201d \u7684\u573a\u666f&#xff08;\u5982\u4ec5\u7528\u6d3e\u751f\u7c7b\u6307\u9488B* p &#061; new B();&#xff09;&#xff0c;\u5219\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u53ef\u8bbe\u4e3a\u975e\u865a\u51fd\u6570 \u2014\u2014 \u4f46\u4ece\u4ee3\u7801\u6269\u5c55\u6027\u89d2\u5ea6&#xff0c;\u53ea\u8981\u7c7b\u53ef\u80fd\u88ab\u7ee7\u627f&#xff0c;\u5efa\u8bae\u9ed8\u8ba4\u5c06\u6790\u6784\u51fd\u6570\u8bbe\u4e3a\u865a\u51fd\u6570&#xff0c;\u907f\u514d\u540e\u7eed\u4f7f\u7528\u65f6\u51fa\u73b0\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<p>\u4e09\u3001\u5e95\u5c42\u539f\u7406&#xff1a;\u865a\u6790\u6784\u51fd\u6570\u5982\u4f55\u5b9e\u73b0 \u201c\u52a8\u6001\u91ca\u653e\u201d&#xff1f;<\/p>\n<p>\u865a\u6790\u6784\u51fd\u6570\u7684\u52a8\u6001\u7ed1\u5b9a\u673a\u5236\u4e0e\u666e\u901a\u865a\u51fd\u6570\u4e00\u81f4&#xff0c;\u4f9d\u8d56 \u201c\u865a\u8868\u6307\u9488 &#043; \u865a\u8868\u201d \u7684\u5e95\u5c42\u7ed3\u6784&#xff1a;<\/p>\n<p>1. \u57fa\u7c7b\u4e0e\u6d3e\u751f\u7c7b\u7684\u865a\u8868\u53d8\u5316<\/p>\n<ul>\n<li>\u57fa\u7c7bA&#xff08;\u542b\u865a\u6790\u6784\u51fd\u6570&#xff09;&#xff1a;<\/li>\n<li>\u7f16\u8bd1\u5668\u4e3aA\u751f\u6210\u865a\u8868&#xff0c;\u8868\u4e2d\u5b58\u50a8A::destructor&#xff08;\u5373~A()&#xff09;\u7684\u5730\u5740&#xff1b;<\/li>\n<li>A\u7c7b\u5bf9\u8c61\u5305\u542b\u865a\u8868\u6307\u9488__vfptr&#xff0c;\u6307\u5411A\u7684\u865a\u8868\u3002<\/li>\n<li>\u6d3e\u751f\u7c7bB&#xff08;\u7ee7\u627fA&#xff0c;\u542b\u6790\u6784\u51fd\u6570&#xff09;&#xff1a;<\/li>\n<li>\u7f16\u8bd1\u5668\u4e3aB\u751f\u6210\u72ec\u7acb\u865a\u8868&#xff0c;\u8868\u4e2d\u539f\u672c\u7ee7\u627fA\u7684A::destructor\u5730\u5740&#xff0c;\u4f1a\u88abB::destructor&#xff08;\u5373~B()&#xff09;\u7684\u5730\u5740\u8986\u76d6&#xff08;\u91cd\u5199\u6548\u679c&#xff09;&#xff1b;<\/li>\n<li>B\u7c7b\u5bf9\u8c61\u7684\u865a\u8868\u6307\u9488__vfptr\u6307\u5411B\u7684\u865a\u8868&#xff0c;\u4e14\u5bf9\u8c61\u5185\u5b58\u5e03\u5c40\u4e2d\u5305\u542b\u57fa\u7c7bA\u7684\u6210\u5458&#xff08;\u82e5\u6709&#xff09;\u548c\u81ea\u8eab\u6210\u5458_p\u3002<\/li>\n<\/ul>\n<p>2. delete\u64cd\u4f5c\u7684\u5e95\u5c42\u6267\u884c\u6d41\u7a0b<\/p>\n<p>\u5f53\u6267\u884cdelete p2&#xff08;p2\u4e3aA*&#xff0c;\u6307\u5411B\u5bf9\u8c61&#xff09;\u65f6&#xff0c;\u5e95\u5c42\u6d41\u7a0b\u5982\u4e0b&#xff1a;<\/p>\n<li>\u8bfb\u53d6p2\u6307\u5411\u5bf9\u8c61\u7684\u865a\u8868\u6307\u9488__vfptr&#xff0c;\u627e\u5230B\u7684\u865a\u8868&#xff1b;<\/li>\n<li>\u4eceB\u7684\u865a\u8868\u4e2d\u53d6\u51faB::destructor\u7684\u5730\u5740&#xff0c;\u8c03\u7528B\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u91ca\u653e_p\u8d44\u6e90&#xff1b;<\/li>\n<li>\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\u540e&#xff0c;\u81ea\u52a8\u8c03\u7528\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570&#xff08;\u7f16\u8bd1\u5668\u5728B::destructor\u4e2d\u63d2\u5165\u8c03\u7528A::destructor\u7684\u4ee3\u7801&#xff09;&#xff1b;<\/li>\n<li>\u91ca\u653ep2\u6307\u5411\u7684\u5806\u5185\u5b58&#xff08;\u5bf9\u8c61\u672c\u8eab\u7684\u5185\u5b58&#xff09;\u3002<\/li>\n<p>\u82e5\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u975e\u865a\u51fd\u6570&#xff0c;\u5219\u6b65\u9aa4 1-2 \u4f1a\u8df3\u8fc7\u865a\u8868\u67e5\u627e&#xff0c;\u76f4\u63a5\u8c03\u7528A::destructor&#xff0c;\u5bfc\u81f4\u6d3e\u751f\u7c7b\u8d44\u6e90\u672a\u91ca\u653e\u3002<\/p>\n<p>\u56db\u3001\u9762\u8bd5\u8003\u70b9\u62c6\u89e3&#xff1a;\u5982\u4f55\u6e05\u6670\u8bb2\u89e3\u865a\u6790\u6784\u51fd\u6570&#xff1f;<\/p>\n<p>\u865a\u6790\u6784\u51fd\u6570\u662f C&#043;&#043; \u9762\u8bd5\u7684\u9ad8\u9891\u8003\u70b9&#xff0c;\u9762\u8bd5\u5b98\u901a\u5e38\u4f1a\u8981\u6c42 \u201c\u7ed3\u5408\u4ee3\u7801\u793a\u4f8b\u8bb2\u89e3\u4e3a\u4ec0\u4e48\u9700\u8981\u865a\u6790\u6784\u51fd\u6570\u201d&#xff0c;\u53ef\u6309\u4ee5\u4e0b\u903b\u8f91\u68b3\u7406\u56de\u7b54&#xff1a;<\/p>\n<p>1. \u6838\u5fc3\u95ee\u9898&#xff1a;\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u4e0d\u52a0virtual\u7684\u98ce\u9669<\/p>\n<ul>\n<li>\u7528\u63d0\u4f9b\u7684\u4ee3\u7801\u793a\u4f8b\u8bf4\u660e&#xff1a;\u5f53\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u975e\u865a\u51fd\u6570\u65f6&#xff0c;A* p2 &#061; new B(); delete p2;\u4ec5\u8c03\u7528~A()&#xff0c;B\u4e2dnew int[10]\u7684\u8d44\u6e90\u672a\u91ca\u653e&#xff0c;\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u5f3a\u8c03&#xff1a;\u82e5\u6d3e\u751f\u7c7b\u6709\u5806\u8d44\u6e90&#xff08;\u5982\u6307\u9488\u3001\u5bb9\u5668\u7b49&#xff09;&#xff0c;\u975e\u865a\u6790\u6784\u51fd\u6570\u4f1a\u5bfc\u81f4\u8d44\u6e90\u6cc4\u6f0f&#xff0c;\u8fd9\u662f\u7a0b\u5e8f\u7a33\u5b9a\u6027\u7684\u91cd\u5927\u9690\u60a3\u3002<\/li>\n<\/ul>\n<p>2. \u89e3\u51b3\u65b9\u6848&#xff1a;\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u52a0virtual<\/p>\n<ul>\n<li>\u89e3\u91ca\u6790\u6784\u51fd\u6570\u91cd\u5199\u7684\u7279\u6b8a\u6027&#xff1a;\u7f16\u8bd1\u5668\u7edf\u4e00\u5904\u7406\u6790\u6784\u51fd\u6570\u540d\u79f0\u4e3adestructor&#xff0c;\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u81ea\u52a8\u91cd\u5199\u57fa\u7c7b\u865a\u6790\u6784\u51fd\u6570&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u5c55\u793a\u4ee3\u7801\u8fd0\u884c\u7ed3\u679c&#xff1a;\u52a0virtual\u540e&#xff0c;delete p2\u5148\u8c03\u7528~B()\u91ca\u653e\u8d44\u6e90&#xff0c;\u518d\u8c03\u7528~A()&#xff0c;\u65e0\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n<\/ul>\n<p>3. \u6269\u5c55\u6ce8\u610f\u4e8b\u9879<\/p>\n<ul>\n<li>\u82e5\u7c7b\u4e0d\u88ab\u7ee7\u627f&#xff0c;\u6790\u6784\u51fd\u6570\u53ef\u8bbe\u4e3a\u975e\u865a\u51fd\u6570&#xff08;\u51cf\u5c11\u865a\u8868\u5f00\u9500&#xff09;&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u82e5\u7c7b\u662f\u62bd\u8c61\u57fa\u7c7b&#xff08;\u542b\u7eaf\u865a\u51fd\u6570&#xff09;&#xff0c;\u6790\u6784\u51fd\u6570\u5fc5\u987b\u8bbe\u4e3a\u865a\u51fd\u6570&#xff08;\u5426\u5219\u65e0\u6cd5\u5b9e\u4f8b\u5316&#xff0c;\u4e14\u6d3e\u751f\u7c7b\u91ca\u653e\u4f1a\u6709\u98ce\u9669&#xff09;&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u591a\u5c42\u7ee7\u627f\u573a\u666f&#xff08;\u5982C\u7ee7\u627fB&#xff0c;B\u7ee7\u627fA&#xff09;&#xff0c;\u53ea\u9700\u57fa\u7c7bA\u7684\u6790\u6784\u51fd\u6570\u52a0virtual&#xff0c;B\u548cC\u7684\u6790\u6784\u51fd\u6570\u4f1a\u81ea\u52a8\u7ee7\u627f\u865a\u5c5e\u6027\u5e76\u5b8c\u6210\u91cd\u5199\u3002<\/li>\n<\/ul>\n<p>\u4e94\u3001\u4ee3\u7801\u9a8c\u8bc1&#xff1a;\u5b8c\u6574\u53ef\u8fd0\u884c\u793a\u4f8b<\/p>\n<p>\u5c06\u4ee3\u7801\u8865\u5145\u5b8c\u6574&#xff0c;\u53ef\u76f4\u63a5\u7f16\u8bd1\u8fd0\u884c&#xff0c;\u9a8c\u8bc1\u865a\u6790\u6784\u51fd\u6570\u7684\u6548\u679c&#xff1a;<\/p>\n<p>#include &lt;iostream&gt;<br \/>\nusing namespace std;<\/p>\n<p>class A {<br \/>\npublic:<br \/>\n    virtual ~A() { \/\/ \u57fa\u7c7b\u865a\u6790\u6784\u51fd\u6570<br \/>\n        cout &lt;&lt; &#034;~A()&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>class B : public A {<br \/>\npublic:<br \/>\n    ~B() { \/\/ \u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570&#xff0c;\u81ea\u52a8\u91cd\u5199\u57fa\u7c7b\u865a\u6790\u6784\u51fd\u6570<br \/>\n        cout &lt;&lt; &#034;~B()-&gt;delete:&#034; &lt;&lt; _p &lt;&lt; endl;<br \/>\n        delete _p; \/\/ \u91ca\u653e\u6d3e\u751f\u7c7b\u7533\u8bf7\u7684\u5806\u8d44\u6e90<br \/>\n    }<br \/>\nprotected:<br \/>\n    int* _p &#061; new int[10]; \/\/ \u6d3e\u751f\u7c7b\u5728\u5806\u4e0a\u7533\u8bf710\u4e2aint\u7684\u7a7a\u95f4<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    A* p1 &#061; new A;   \/\/ \u57fa\u7c7b\u6307\u9488\u6307\u5411\u57fa\u7c7b\u5bf9\u8c61<br \/>\n    A* p2 &#061; new B;   \/\/ \u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61<\/p>\n<p>    delete p1; \/\/ \u8c03\u7528A\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u8f93\u51fa\u201c~A()\u201d<br \/>\n    delete p2; \/\/ \u5148\u8c03\u7528B\u7684\u6790\u6784\u51fd\u6570&#xff08;\u91ca\u653e_p&#xff09;&#xff0c;\u518d\u8c03\u7528A\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u8f93\u51fa\u201c~B()-&gt;delete:&#8230; \u201d\u548c\u201c~A()\u201d<\/p>\n<p>    return 0;<br \/>\n}<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff08;\u793a\u4f8b&#xff0c;_p\u5730\u5740\u4e3a\u968f\u673a\u503c&#xff09;&#xff1a;<\/p>\n<p>~A()<br \/>\n~B()-&gt;delete:0x55f8d7a7c2c0<br \/>\n~A()<\/p>\n<p>\u516d\u3001\u5173\u952e\u7ed3\u8bba&#xff1a;\u865a\u6790\u6784\u51fd\u6570\u7684\u6838\u5fc3\u8981\u70b9<\/p>\n<li>\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u52a0virtual\u540e&#xff0c;\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u81ea\u52a8\u91cd\u5199&#xff08;\u7f16\u8bd1\u5668\u7edf\u4e00\u5904\u7406\u6790\u6784\u51fd\u6570\u540d\u79f0&#xff09;&#xff1b;<\/li>\n<li>\u6838\u5fc3\u4f5c\u7528&#xff1a;\u7528\u57fa\u7c7b\u6307\u9488\u91ca\u653e\u6d3e\u751f\u7c7b\u5bf9\u8c61\u65f6&#xff0c;\u786e\u4fdd\u6d3e\u751f\u7c7b\u6790\u6784\u51fd\u6570\u88ab\u8c03\u7528&#xff0c;\u907f\u514d\u5185\u5b58 \/ \u8d44\u6e90\u6cc4\u6f0f&#xff1b;<\/li>\n<li>\u9002\u7528\u573a\u666f&#xff1a;\u7c7b\u6709\u7ee7\u627f\u5173\u7cfb&#xff0c;\u4e14\u53ef\u80fd\u7528\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u9762\u8bd5\u5fc5\u80cc&#xff1a;\u7ed3\u5408 \u201c\u975e\u865a\u6790\u6784\u51fd\u6570\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u201d \u7684\u4ee3\u7801\u793a\u4f8b&#xff0c;\u8bb2\u89e3\u865a\u6790\u6784\u51fd\u6570\u7684\u5fc5\u8981\u6027\u548c\u5e95\u5c42\u673a\u5236\u3002<\/li>\n<p>\u8fd9\u4e2a\u4e5f\u662f\u4e00\u4e2a\u6bd4\u8f83\u9ad8\u9891\u7684\u8003\u70b9&#xff0c;\u5e0c\u671b\u5927\u5bb6\u6ce8\u610f\u3002<\/p>\n<h2>override\u548cfinal\u5173\u952e\u5b57&#xff1a;<\/h2>\n<p>\u5728 C&#043;&#043; \u865a\u51fd\u6570\u91cd\u5199\u573a\u666f\u4e2d&#xff0c;\u7531\u4e8e\u91cd\u5199\u89c4\u5219&#xff08;\u5982\u51fd\u6570\u540d\u3001\u53c2\u6570\u5217\u8868\u3001\u8fd4\u56de\u503c\u7c7b\u578b\u9700\u4e25\u683c\u5339\u914d&#xff09;\u8f83\u4e3a\u4e25\u683c&#xff0c;\u5b9e\u9645\u5f00\u53d1\u4e2d\u5bb9\u6613\u56e0\u758f\u5ffd&#xff08;\u5982\u51fd\u6570\u540d\u62fc\u5199\u9519\u8bef\u3001\u53c2\u6570\u7c7b\u578b\u5199\u9519\u3001\u6f0f\u5199virtual&#xff09;\u5bfc\u81f4 \u201c\u770b\u4f3c\u91cd\u5199&#xff0c;\u5b9e\u5219\u672a\u91cd\u5199\u201d \u7684\u9690\u6027\u9519\u8bef \u2014\u2014 \u8fd9\u7c7b\u9519\u8bef\u7f16\u8bd1\u671f\u4e0d\u4f1a\u62a5\u9519&#xff0c;\u4f46\u8fd0\u884c\u65f6\u4f1a\u56e0\u591a\u6001\u5931\u6548\u51fa\u73b0\u975e\u9884\u671f\u7ed3\u679c&#xff0c;\u8c03\u8bd5\u6210\u672c\u6781\u9ad8\u3002\u4e3a\u6b64&#xff0c;C&#043;&#043;11 \u5f15\u5165override\u548cfinal\u4e24\u4e2a\u5173\u952e\u5b57&#xff0c;\u5206\u522b\u89e3\u51b3 \u201c\u91cd\u5199\u6709\u6548\u6027\u68c0\u6d4b\u201d \u548c \u201c\u7981\u6b62\u91cd\u5199\u201d \u7684\u9700\u6c42&#xff0c;\u5177\u4f53\u7ec6\u8282\u5982\u4e0b&#xff1a;<\/p>\n<h4>\u4e00\u3001\u5148\u660e\u786e\u6838\u5fc3\u75db\u70b9&#xff1a;\u865a\u51fd\u6570\u91cd\u5199\u7684\u9690\u6027\u9519\u8bef\u9690\u60a3<\/h4>\n<p>\u7ed3\u5408\u4e4b\u524d\u865a\u51fd\u6570\u91cd\u5199\u7684\u4e25\u683c\u89c4\u5219&#xff08;\u4e09\u540c &#043; \u534f\u53d8\u4f8b\u5916&#xff09;&#xff0c;\u5b9e\u9645\u5f00\u53d1\u4e2d\u5e38\u89c1\u7684\u91cd\u5199\u758f\u5ffd\u573a\u666f\u5305\u62ec&#xff1a;<\/p>\n<li>\u51fd\u6570\u540d\u62fc\u5199\u9519\u8bef&#xff1a;\u57fa\u7c7b\u865a\u51fd\u6570\u4e3avirtual void buyTicket()&#xff0c;\u6d3e\u751f\u7c7b\u8bef\u5199\u4e3avirtual void buyTcket()&#xff08;\u5c11\u5199\u5b57\u6bcdi&#xff09;&#xff1b;<\/li>\n<li>\u53c2\u6570\u5217\u8868\u4e0d\u5339\u914d&#xff1a;\u57fa\u7c7b\u865a\u51fd\u6570\u4e3avirtual void calc(double price)&#xff0c;\u6d3e\u751f\u7c7b\u8bef\u5199\u4e3avirtual void calc(int price)&#xff08;\u53c2\u6570\u7c7b\u578b\u4ecedouble\u6539\u4e3aint&#xff09;&#xff1b;<\/li>\n<li>\u8fd4\u56de\u503c\u7c7b\u578b\u9519\u8bef&#xff1a;\u57fa\u7c7b\u865a\u51fd\u6570\u4e3avirtual int getValue()&#xff0c;\u6d3e\u751f\u7c7b\u8bef\u5199\u4e3avirtual double getValue()&#xff08;\u8fd4\u56de\u503c\u4eceint\u6539\u4e3adouble&#xff0c;\u4e14\u975e\u534f\u53d8\u573a\u666f&#xff09;&#xff1b;<\/li>\n<li>\u57fa\u7c7b\u51fd\u6570\u975e\u865a\u51fd\u6570&#xff1a;\u6d3e\u751f\u7c7b\u60f3\u91cd\u5199\u57fa\u7c7b\u51fd\u6570&#xff0c;\u4f46\u57fa\u7c7b\u51fd\u6570\u672a\u52a0virtual&#xff0c;\u6d3e\u751f\u7c7b\u5373\u4fbf\u6ee1\u8db3 \u201c\u4e09\u540c\u201d&#xff0c;\u4e5f\u53ea\u662f\u51fd\u6570\u9690\u85cf\u800c\u975e\u91cd\u5199\u3002<\/li>\n<p>\u8fd9\u4e9b\u9519\u8bef\u7684\u5171\u6027\u662f&#xff1a;\u7f16\u8bd1\u671f\u7f16\u8bd1\u5668\u4f1a\u5c06\u5176\u5224\u5b9a\u4e3a \u201c\u6d3e\u751f\u7c7b\u65b0\u589e\u51fd\u6570\u201d&#xff0c;\u65e0\u62a5\u9519\u63d0\u793a&#xff0c;\u4f46\u8fd0\u884c\u65f6\u8c03\u7528\u8be5\u51fd\u6570\u65f6&#xff0c;\u591a\u6001\u5931\u6548&#xff08;\u4ecd\u6267\u884c\u57fa\u7c7b\u903b\u8f91&#xff09;&#xff0c;\u4f8b\u5982\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61\u8c03\u7528 \u201c\u672a\u6210\u529f\u91cd\u5199\u7684\u51fd\u6570\u201d&#xff0c;\u4f1a\u6267\u884c\u57fa\u7c7b\u5b9e\u73b0&#xff0c;\u4e0e\u9884\u671f\u4e0d\u7b26\u3002<\/p>\n<h4>\u4e8c\u3001override \u5173\u952e\u5b57&#xff1a;\u89e3\u51b3 \u201c\u91cd\u5199\u6709\u6548\u6027\u68c0\u6d4b\u201d \u95ee\u9898<\/h4>\n<p>override\u5173\u952e\u5b57\u7684\u6838\u5fc3\u4f5c\u7528\u662f \u201c\u663e\u5f0f\u58f0\u660e\u6d3e\u751f\u7c7b\u51fd\u6570\u610f\u56fe\u91cd\u5199\u57fa\u7c7b\u865a\u51fd\u6570&#xff0c;\u5e76\u8ba9\u7f16\u8bd1\u5668\u5f3a\u5236\u6821\u9a8c\u91cd\u5199\u6761\u4ef6\u201d\u2014\u2014 \u82e5\u4e0d\u6ee1\u8db3\u91cd\u5199\u6761\u4ef6&#xff0c;\u7f16\u8bd1\u5668\u76f4\u63a5\u62a5\u9519&#xff0c;\u5c06\u9690\u6027\u9519\u8bef\u63d0\u524d\u5230\u7f16\u8bd1\u671f\u66b4\u9732&#xff0c;\u907f\u514d\u8fd0\u884c\u65f6\u8c03\u8bd5\u3002<\/p>\n<p>1. override \u7684\u6838\u5fc3\u529f\u80fd&#xff1a;\u7f16\u8bd1\u671f\u5f3a\u5236\u6821\u9a8c\u91cd\u5199\u6761\u4ef6<\/p>\n<p>\u5f53\u6d3e\u751f\u7c7b\u6210\u5458\u51fd\u6570\u540e\u52a0override\u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u68c0\u67e5\u4ee5\u4e0b 4 \u4e2a\u91cd\u5199\u6761\u4ef6&#xff0c;\u53ea\u8981\u6709\u4e00\u4e2a\u4e0d\u6ee1\u8db3&#xff0c;\u5c31\u4f1a\u7f16\u8bd1\u62a5\u9519&#xff1a;<\/p>\n<ul>\n<li>\u6761\u4ef6 1&#xff1a;\u57fa\u7c7b\u4e2d\u5b58\u5728\u4e0e\u6d3e\u751f\u7c7b\u51fd\u6570 \u201c\u51fd\u6570\u540d\u3001\u53c2\u6570\u5217\u8868\u3001\u8fd4\u56de\u503c\u7c7b\u578b\u5b8c\u5168\u5339\u914d\u201d \u7684\u865a\u51fd\u6570&#xff08;\u534f\u53d8\u573a\u666f\u9664\u5916&#xff09;&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u6761\u4ef6 2&#xff1a;\u57fa\u7c7b\u4e2d\u7684\u8be5\u51fd\u6570\u5fc5\u987b\u88abvirtual\u4fee\u9970&#xff08;\u5373\u865a\u51fd\u6570&#xff09;&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u6761\u4ef6 3&#xff1a;\u6d3e\u751f\u7c7b\u51fd\u6570\u7684\u53c2\u6570\u5217\u8868\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u5b8c\u5168\u4e00\u81f4&#xff08;\u53c2\u6570\u7c7b\u578b\u3001\u6570\u91cf\u3001\u987a\u5e8f\u5747\u9700\u5339\u914d&#xff0c;\u4e0e\u53c2\u6570\u540d\u65e0\u5173&#xff09;&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u6761\u4ef6 4&#xff1a;\u6d3e\u751f\u7c7b\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u4e00\u81f4&#xff08;\u6216\u6ee1\u8db3\u534f\u53d8\u6761\u4ef6&#xff1a;\u57fa\u7c7b\u8fd4\u56de\u57fa\u7c7b\u6307\u9488 \/ \u5f15\u7528&#xff0c;\u6d3e\u751f\u7c7b\u8fd4\u56de\u6d3e\u751f\u7c7b\u6307\u9488 \/ \u5f15\u7528&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u8fd9\u56db\u91cd\u6821\u9a8c&#xff0c;override\u80fd 100% \u786e\u4fdd\u6d3e\u751f\u7c7b\u51fd\u6570\u662f \u201c\u6709\u6548\u91cd\u5199\u201d&#xff0c;\u800c\u975e \u201c\u65b0\u589e\u51fd\u6570\u201d \u6216 \u201c\u9519\u8bef\u9690\u85cf\u201d\u3002<\/p>\n<p>2. override \u7684\u8bed\u6cd5\u7ec6\u8282&#xff1a;\u4f4d\u7f6e\u4e0e\u4f7f\u7528\u89c4\u8303<\/p>\n<ul>\n<li>\u8bed\u6cd5\u4f4d\u7f6e&#xff1a;\u5fc5\u987b\u52a0\u5728\u6d3e\u751f\u7c7b\u6210\u5458\u51fd\u6570\u7684 \u201c\u53c2\u6570\u5217\u8868\u540e\u9762\u201d&#xff0c;const&#xff08;\u82e5\u51fd\u6570\u4e3a const \u6210\u5458\u51fd\u6570&#xff09;\u4e4b\u540e&#xff0c;\u51fd\u6570\u4f53\u4e4b\u524d&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u6b63\u786e\u5199\u6cd5&#xff1a;virtual void buyTicket() override { &#8230; }\u3001virtual int getValue() const override { &#8230; }&#xff1b;<\/li>\n<li>\u9519\u8bef\u5199\u6cd5&#xff1a;override virtual void buyTicket() { &#8230; }&#xff08;\u4f4d\u7f6e\u9519\u8bef&#xff0c;override\u4e0d\u80fd\u5728virtual\u524d&#xff09;\u3001virtual void buyTicket(override) { &#8230; }&#xff08;\u52a0\u5728\u53c2\u6570\u5217\u8868\u5185&#xff0c;\u8bed\u6cd5\u9519\u8bef&#xff09;\u3002<\/li>\n<li>virtual\u7684\u53ef\u7701\u7565\u6027&#xff1a;\u6d3e\u751f\u7c7b\u51fd\u6570\u52a0override\u540e&#xff0c;virtual\u5173\u952e\u5b57\u53ef\u7701\u7565&#xff08;\u56e0override\u5df2\u6697\u793a\u8be5\u51fd\u6570\u662f\u91cd\u5199\u7684\u865a\u51fd\u6570&#xff0c;\u7ee7\u627f\u57fa\u7c7b\u7684\u865a\u5c5e\u6027&#xff09;&#xff0c;\u4f46\u4e3a\u53ef\u8bfb\u6027\u5efa\u8bae\u4fdd\u7559&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u793a\u4f8b&#xff1a;void buyTicket() override { &#8230; }&#xff08;\u5408\u6cd5&#xff0c;virtual\u7701\u7565&#xff09;\u3001virtual void buyTicket() override { &#8230; }&#xff08;\u66f4\u89c4\u8303&#xff0c;\u660e\u786e\u865a\u51fd\u6570\u5c5e\u6027&#xff09;\u3002<\/li>\n<\/ul>\n<p>3. override \u7684\u5b9e\u9645\u4ee3\u7801\u793a\u4f8b&#xff1a;\u6b63\u786e\u4e0e\u9519\u8bef\u573a\u666f\u5bf9\u6bd4<\/p>\n<p>&#xff08;1&#xff09;\u6b63\u786e\u573a\u666f&#xff1a;\u6709\u6548\u91cd\u5199&#xff0c;\u7f16\u8bd1\u901a\u8fc7<\/p>\n<p>class Person { \/\/ \u57fa\u7c7b<br \/>\npublic:<br \/>\n    virtual void buyTicket(double price) { \/\/ \u57fa\u7c7b\u865a\u51fd\u6570<br \/>\n        cout &lt;&lt; &#034;\u666e\u901a\u4eba\u4e70\u7968&#xff1a;&#034; &lt;&lt; price &lt;&lt; &#034;\u5143&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>class Student : public Person { \/\/ \u6d3e\u751f\u7c7b<br \/>\npublic:<br \/>\n    \/\/ \u52a0override&#xff0c;\u7f16\u8bd1\u5668\u6821\u9a8c\u91cd\u5199\u6761\u4ef6&#xff08;\u51fd\u6570\u540d\u3001\u53c2\u6570\u3001\u8fd4\u56de\u503c\u5747\u5339\u914d\u57fa\u7c7b\u865a\u51fd\u6570&#xff09;<br \/>\n    virtual void buyTicket(double price) override {<br \/>\n        cout &lt;&lt; &#034;\u5b66\u751f\u4e70\u7968&#xff1a;&#034; &lt;&lt; price * 0.75 &lt;&lt; &#034;\u5143&#xff08;75\u6298&#xff09;&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    Person* p &#061; new Student();<br \/>\n    p-&gt;buyTicket(100); \/\/ \u591a\u6001\u751f\u6548&#xff0c;\u8f93\u51fa\u201c\u5b66\u751f\u4e70\u7968&#xff1a;75\u5143&#xff08;75\u6298&#xff09;\u201d<br \/>\n    delete p;<br \/>\n    return 0;<br \/>\n}<\/p>\n<ul>\n<li>\u7f16\u8bd1\u7ed3\u679c&#xff1a;\u65e0\u62a5\u9519&#xff0c;\u8fd0\u884c\u65f6\u591a\u6001\u6b63\u5e38\u751f\u6548\u3002<\/li>\n<\/ul>\n<p>&#xff08;2&#xff09;\u9519\u8bef\u573a\u666f 1&#xff1a;\u51fd\u6570\u540d\u62fc\u5199\u9519\u8bef&#xff0c;\u7f16\u8bd1\u62a5\u9519<\/p>\n<p>class Person {<br \/>\npublic:<br \/>\n    virtual void buyTicket(double price) { &#8230; }<br \/>\n};<\/p>\n<p>class Student : public Person {<br \/>\npublic:<br \/>\n    \/\/ \u9519\u8bef&#xff1a;\u51fd\u6570\u540d\u8bef\u5199\u4e3abuyTcket&#xff08;\u5c11\u5199i&#xff09;&#xff0c;\u52a0override\u540e\u7f16\u8bd1\u5668\u68c0\u6d4b\u5230\u65e0\u5339\u914d\u57fa\u7c7b\u865a\u51fd\u6570&#xff0c;\u62a5\u9519<br \/>\n    virtual void buyTcket(double price) override { &#8230; }<br \/>\n};<\/p>\n<ul>\n<li>\u7f16\u8bd1\u5668\u62a5\u9519\u4fe1\u606f&#xff08;\u4ee5 GCC \u4e3a\u4f8b&#xff09;&#xff1a;error: \u2018virtual void Student::buyTcket(double)\u2019 marked \u2018override\u2019, but does not override any member function&#xff08;\u51fd\u6570\u52a0\u4e86override&#xff0c;\u4f46\u672a\u91cd\u5199\u4efb\u4f55\u57fa\u7c7b\u6210\u5458\u51fd\u6570&#xff09;\u3002<\/li>\n<\/ul>\n<p>&#xff08;3&#xff09;\u9519\u8bef\u573a\u666f 2&#xff1a;\u53c2\u6570\u7c7b\u578b\u4e0d\u5339\u914d&#xff0c;\u7f16\u8bd1\u62a5\u9519<\/p>\n<p>class Person {<br \/>\npublic:<br \/>\n    virtual void calc(double price) { &#8230; } \/\/ \u57fa\u7c7b\u53c2\u6570\u4e3adouble<br \/>\n};<\/p>\n<p>class Student : public Person {<br \/>\npublic:<br \/>\n    \/\/ \u9519\u8bef&#xff1a;\u53c2\u6570\u7c7b\u578b\u6539\u4e3aint&#xff0c;\u4e0e\u57fa\u7c7b\u865a\u51fd\u6570\u4e0d\u5339\u914d&#xff0c;\u52a0override\u540e\u7f16\u8bd1\u5668\u62a5\u9519<br \/>\n    virtual void calc(int price) override { &#8230; }<br \/>\n};<\/p>\n<ul>\n<li>\u7f16\u8bd1\u5668\u62a5\u9519\u4fe1\u606f&#xff1a;error: \u2018virtual void Student::calc(int)\u2019 marked \u2018override\u2019, but does not override any member function&#xff08;\u65e0\u5339\u914d\u7684\u57fa\u7c7b\u865a\u51fd\u6570&#xff09;\u3002<\/li>\n<\/ul>\n<h4>\u4e09\u3001final \u5173\u952e\u5b57&#xff1a;\u89e3\u51b3 \u201c\u7981\u6b62\u865a\u51fd\u6570\u91cd\u5199\u201d \u95ee\u9898<\/h4>\n<p>final\u5173\u952e\u5b57\u7684\u6838\u5fc3\u4f5c\u7528\u662f \u201c\u663e\u5f0f\u7981\u6b62\u57fa\u7c7b\u865a\u51fd\u6570\u88ab\u540e\u7eed\u6d3e\u751f\u7c7b\u91cd\u5199\u201d\u2014\u2014 \u5f53\u57fa\u7c7b\u865a\u51fd\u6570\u52a0final\u540e&#xff0c;\u4efb\u4f55\u6d3e\u751f\u7c7b\u82e5\u8bd5\u56fe\u91cd\u5199\u8be5\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u76f4\u63a5\u62a5\u9519&#xff0c;\u9002\u7528\u4e8e \u201c\u57fa\u7c7b\u865a\u51fd\u6570\u903b\u8f91\u56fa\u5b9a&#xff0c;\u4e0d\u5141\u8bb8\u5b50\u7c7b\u4fee\u6539\u201d \u7684\u573a\u666f&#xff08;\u5982\u57fa\u7840\u5de5\u5177\u7c7b\u7684\u6838\u5fc3\u51fd\u6570&#xff09;\u3002<\/p>\n<p>1. final \u7684\u6838\u5fc3\u529f\u80fd&#xff1a;\u5f3a\u5236\u7981\u6b62\u91cd\u5199<\/p>\n<p>final\u7684\u7ea6\u675f\u903b\u8f91\u5206\u4e3a\u4e24\u79cd\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u573a\u666f 1&#xff1a;\u4fee\u9970\u57fa\u7c7b\u865a\u51fd\u6570&#xff1a;\u7981\u6b62\u8be5\u865a\u51fd\u6570\u88ab\u4efb\u4f55\u6d3e\u751f\u7c7b\u91cd\u5199&#xff08;\u5305\u62ec\u76f4\u63a5\u6d3e\u751f\u7c7b\u3001\u95f4\u63a5\u6d3e\u751f\u7c7b&#xff09;&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u573a\u666f 2&#xff1a;\u4fee\u9970\u7c7b&#xff1a;\u7981\u6b62\u8be5\u7c7b\u88ab\u7ee7\u627f&#xff08;\u4e0e\u865a\u51fd\u6570\u91cd\u5199\u65e0\u5173&#xff0c;\u5c5e\u4e8e\u989d\u5916\u529f\u80fd&#xff0c;\u6b64\u5904\u91cd\u70b9\u5173\u6ce8\u865a\u51fd\u6570\u4fee\u9970\u573a\u666f&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u6b64\u5904\u91cd\u70b9\u5173\u6ce8 \u201c\u4fee\u9970\u865a\u51fd\u6570\u201d \u7684\u573a\u666f&#xff1a;\u57fa\u7c7b\u865a\u51fd\u6570\u52a0final\u540e&#xff0c;\u6d3e\u751f\u7c7b\u5373\u4fbf\u6ee1\u8db3 \u201c\u4e09\u540c\u201d \u89c4\u5219&#xff0c;\u4e5f\u4e0d\u80fd\u91cd\u5199\u8be5\u51fd\u6570&#xff0c;\u5426\u5219\u7f16\u8bd1\u62a5\u9519\u3002<\/p>\n<p>2. final \u7684\u8bed\u6cd5\u7ec6\u8282&#xff1a;\u4f4d\u7f6e\u4e0e\u4f7f\u7528\u89c4\u8303<\/p>\n<ul>\n<li>\u8bed\u6cd5\u4f4d\u7f6e&#xff1a;\u4e0eoverride\u4e00\u81f4&#xff0c;\u5fc5\u987b\u52a0\u5728\u57fa\u7c7b\u865a\u51fd\u6570\u7684 \u201c\u53c2\u6570\u5217\u8868\u540e\u9762\u201d&#xff0c;const\u4e4b\u540e&#xff0c;\u51fd\u6570\u4f53\u4e4b\u524d&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u6b63\u786e\u5199\u6cd5&#xff1a;virtual void showInfo() final { &#8230; }\u3001virtual double getDiscount() const final { &#8230; }&#xff1b;<\/li>\n<li>\u9519\u8bef\u5199\u6cd5&#xff1a;final virtual void showInfo() { &#8230; }&#xff08;\u4f4d\u7f6e\u9519\u8bef&#xff0c;final\u4e0d\u80fd\u5728virtual\u524d&#xff09;\u3001virtual void showInfo(final) { &#8230; }&#xff08;\u52a0\u5728\u53c2\u6570\u5217\u8868\u5185&#xff0c;\u8bed\u6cd5\u9519\u8bef&#xff09;\u3002<\/li>\n<li>virtual\u7684\u5fc5\u8981\u6027&#xff1a;final\u53ea\u80fd\u4fee\u9970\u865a\u51fd\u6570&#xff08;\u56e0\u53ea\u6709\u865a\u51fd\u6570\u624d\u6709 \u201c\u91cd\u5199\u201d \u7684\u6982\u5ff5&#xff09;&#xff0c;\u56e0\u6b64\u57fa\u7c7b\u51fd\u6570\u5fc5\u987b\u52a0virtual&#xff0c;\u5426\u5219\u7f16\u8bd1\u5668\u62a5\u9519&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u9519\u8bef\u793a\u4f8b&#xff1a;void showInfo() final { &#8230; }&#xff08;\u65e0virtual&#xff0c;\u975e\u865a\u51fd\u6570&#xff0c;\u52a0final\u65e0\u610f\u4e49&#xff0c;\u7f16\u8bd1\u5668\u62a5\u9519&#xff1a;error: \u2018void Person::showInfo()\u2019 marked \u2018final\u2019 but is not virtual&#xff09;\u3002<\/li>\n<\/ul>\n<p>3. final \u7684\u5b9e\u9645\u4ee3\u7801\u793a\u4f8b&#xff1a;\u6b63\u786e\u4e0e\u9519\u8bef\u573a\u666f\u5bf9\u6bd4<\/p>\n<p>&#xff08;1&#xff09;\u6b63\u786e\u573a\u666f&#xff1a;\u57fa\u7c7b\u865a\u51fd\u6570\u52a0 final&#xff0c;\u6d3e\u751f\u7c7b\u4e0d\u91cd\u5199&#xff0c;\u7f16\u8bd1\u901a\u8fc7<\/p>\n<p>class Base { \/\/ \u57fa\u7c7b<br \/>\npublic:<br \/>\n    \/\/ \u52a0final&#xff0c;\u7981\u6b62\u8be5\u865a\u51fd\u6570\u88ab\u6d3e\u751f\u7c7b\u91cd\u5199<br \/>\n    virtual void coreFunc() final {<br \/>\n        cout &lt;&lt; &#034;\u57fa\u7c7b\u6838\u5fc3\u903b\u8f91&#xff1a;\u4e0d\u53ef\u4fee\u6539&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n    \/\/ \u672a\u52a0final&#xff0c;\u5141\u8bb8\u6d3e\u751f\u7c7b\u91cd\u5199<br \/>\n    virtual void normalFunc() {<br \/>\n        cout &lt;&lt; &#034;\u57fa\u7c7b\u666e\u901a\u903b\u8f91&#xff1a;\u53ef\u4fee\u6539&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>class Derived : public Base { \/\/ \u6d3e\u751f\u7c7b<br \/>\npublic:<br \/>\n    \/\/ \u6b63\u786e&#xff1a;\u4e0d\u91cd\u5199coreFunc&#xff08;\u56e0\u52a0\u4e86final&#xff09;&#xff0c;\u4ec5\u91cd\u5199normalFunc<br \/>\n    virtual void normalFunc() override {<br \/>\n        cout &lt;&lt; &#034;\u6d3e\u751f\u7c7b\u4fee\u6539\u540e\u7684\u666e\u901a\u903b\u8f91&#034; &lt;&lt; endl;<br \/>\n    }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    Base* p &#061; new Derived();<br \/>\n    p-&gt;coreFunc(); \/\/ \u6267\u884c\u57fa\u7c7b\u903b\u8f91&#xff1a;\u8f93\u51fa\u201c\u57fa\u7c7b\u6838\u5fc3\u903b\u8f91&#xff1a;\u4e0d\u53ef\u4fee\u6539\u201d<br \/>\n    p-&gt;normalFunc(); \/\/ \u6267\u884c\u6d3e\u751f\u7c7b\u903b\u8f91&#xff1a;\u8f93\u51fa\u201c\u6d3e\u751f\u7c7b\u4fee\u6539\u540e\u7684\u666e\u901a\u903b\u8f91\u201d<br \/>\n    delete p;<br \/>\n    return 0;<br \/>\n}<\/p>\n<ul>\n<li>\u7f16\u8bd1\u7ed3\u679c&#xff1a;\u65e0\u62a5\u9519&#xff0c;coreFunc\u56e0\u52a0final\u65e0\u6cd5\u88ab\u91cd\u5199&#xff0c;\u59cb\u7ec8\u6267\u884c\u57fa\u7c7b\u903b\u8f91&#xff1b;normalFunc\u53ef\u6b63\u5e38\u91cd\u5199\u3002<\/li>\n<\/ul>\n<p>&#xff08;2&#xff09;\u9519\u8bef\u573a\u666f&#xff1a;\u6d3e\u751f\u7c7b\u91cd\u5199\u52a0 final \u7684\u865a\u51fd\u6570&#xff0c;\u7f16\u8bd1\u62a5\u9519<\/p>\n<p>class Base {<br \/>\npublic:<br \/>\n    virtual void coreFunc() final { &#8230; } \/\/ \u57fa\u7c7b\u865a\u51fd\u6570\u52a0final<br \/>\n};<\/p>\n<p>class Derived : public Base {<br \/>\npublic:<br \/>\n    \/\/ \u9519\u8bef&#xff1a;\u8bd5\u56fe\u91cd\u5199\u52a0final\u7684coreFunc&#xff0c;\u7f16\u8bd1\u5668\u76f4\u63a5\u62a5\u9519<br \/>\n    virtual void coreFunc() override { &#8230; }<br \/>\n};<\/p>\n<ul>\n<li>\u7f16\u8bd1\u5668\u62a5\u9519\u4fe1\u606f&#xff08;\u4ee5 GCC \u4e3a\u4f8b&#xff09;&#xff1a;error: virtual function \u2018virtual void Derived::coreFunc()\u2019 overriding final function \u2018virtual void Base::coreFunc()\u2019&#xff08;\u6d3e\u751f\u7c7b\u51fd\u6570\u8bd5\u56fe\u91cd\u5199\u88abfinal\u4fee\u9970\u7684\u57fa\u7c7b\u865a\u51fd\u6570&#xff09;\u3002<\/li>\n<\/ul>\n<h4>\u56db\u3001override \u4e0e final \u7684\u5173\u952e\u533a\u522b\u4e0e\u5171\u6027<\/h4>\n<p>1. \u6838\u5fc3\u533a\u522b&#xff1a;\u4f5c\u7528\u76ee\u6807\u4e0e\u6548\u679c<\/p>\n<table border=\"1\">\n<tbody>\n<tr>\n<td>\n<p>\u5173\u952e\u5b57<\/p>\n<\/td>\n<td>\n<p>\u4f5c\u7528\u76ee\u6807<\/p>\n<\/td>\n<td>\n<p>\u6838\u5fc3\u6548\u679c<\/p>\n<\/td>\n<td>\n<p>\u9002\u7528\u573a\u666f<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>override<\/p>\n<\/td>\n<td>\n<p>\u6d3e\u751f\u7c7b\u6210\u5458\u51fd\u6570<\/p>\n<\/td>\n<td>\n<p>\u5f3a\u5236\u6821\u9a8c\u91cd\u5199\u6761\u4ef6&#xff0c;\u4e0d\u6ee1\u8db3\u5219\u7f16\u8bd1\u62a5\u9519<\/p>\n<\/td>\n<td>\n<p>\u786e\u4fdd\u6d3e\u751f\u7c7b\u51fd\u6570\u662f\u6709\u6548\u91cd\u5199&#xff0c;\u907f\u514d\u758f\u5ffd<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>final<\/p>\n<\/td>\n<td>\n<p>\u57fa\u7c7b\u865a\u51fd\u6570&#xff08;\u6216\u7c7b&#xff09;<\/p>\n<\/td>\n<td>\n<p>\u7981\u6b62\u57fa\u7c7b\u865a\u51fd\u6570\u88ab\u6d3e\u751f\u7c7b\u91cd\u5199&#xff08;\u6216\u7981\u6b62\u7c7b\u7ee7\u627f&#xff09;<\/p>\n<\/td>\n<td>\n<p>\u56fa\u5b9a\u57fa\u7c7b\u6838\u5fc3\u865a\u51fd\u6570\u903b\u8f91&#xff0c;\u4e0d\u5141\u8bb8\u4fee\u6539<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>2. \u5171\u6027&#xff1a;\u8bed\u6cd5\u4f4d\u7f6e\u4e0e\u7f16\u8bd1\u671f\u751f\u6548<\/p>\n<ul>\n<li>\u8bed\u6cd5\u4f4d\u7f6e\u4e00\u81f4&#xff1a;\u5747\u9700\u52a0\u5728 \u201c\u51fd\u6570\u53c2\u6570\u5217\u8868\u540e\u9762\u201d&#xff0c;const\u4e4b\u540e&#xff0c;\u51fd\u6570\u4f53\u4e4b\u524d&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u7f16\u8bd1\u671f\u751f\u6548&#xff1a;\u4e8c\u8005\u5747\u5728\u7f16\u8bd1\u671f\u53d1\u6325\u4f5c\u7528&#xff08;override\u6821\u9a8c\u91cd\u5199\u6709\u6548\u6027&#xff0c;final\u68c0\u67e5\u662f\u5426\u8fdd\u89c4\u91cd\u5199&#xff09;&#xff0c;\u907f\u514d\u8fd0\u884c\u65f6\u9519\u8bef&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u5747\u4e0d\u5f71\u54cd\u6027\u80fd&#xff1a;\u4ec5\u5728\u7f16\u8bd1\u671f\u63d0\u4f9b\u8bed\u6cd5\u6821\u9a8c&#xff0c;\u751f\u6210\u7684\u53ef\u6267\u884c\u6587\u4ef6\u4e2d\u4e0d\u4f1a\u4fdd\u7559\u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\u7684\u4fe1\u606f&#xff0c;\u65e0\u989d\u5916\u6027\u80fd\u5f00\u9500\u3002<\/li>\n<\/ul>\n<h4>\u4e94\u3001\u5b9e\u9645\u5f00\u53d1\u5efa\u8bae&#xff1a;\u5982\u4f55\u5408\u7406\u4f7f\u7528\u4e24\u4e2a\u5173\u952e\u5b57<\/h4>\n<li>\u4f18\u5148\u4f7f\u7528 override&#xff1a;\u53ea\u8981\u6d3e\u751f\u7c7b\u610f\u56fe\u91cd\u5199\u57fa\u7c7b\u865a\u51fd\u6570&#xff0c;\u5c31\u5fc5\u987b\u52a0override\u2014\u2014 \u5373\u4fbf\u91cd\u5199\u6761\u4ef6\u5b8c\u5168\u6ee1\u8db3&#xff0c;override\u4e5f\u80fd\u8ba9\u4ee3\u7801\u53ef\u8bfb\u6027\u66f4\u9ad8&#xff08;\u660e\u786e\u544a\u77e5\u7ef4\u62a4\u8005 \u201c\u8be5\u51fd\u6570\u662f\u91cd\u5199\u7684\u865a\u51fd\u6570\u201d&#xff09;&#xff0c;\u540c\u65f6\u907f\u514d\u540e\u7eed\u57fa\u7c7b\u865a\u51fd\u6570\u4fee\u6539&#xff08;\u5982\u53c2\u6570\u7c7b\u578b\u53d8\u66f4&#xff09;\u5bfc\u81f4\u7684\u6d3e\u751f\u7c7b\u91cd\u5199\u5931\u6548&#xff1b;<\/li>\n<li>\u8c28\u614e\u4f7f\u7528 final&#xff1a;\u4ec5\u5728 \u201c\u57fa\u7c7b\u865a\u51fd\u6570\u903b\u8f91\u7edd\u5bf9\u56fa\u5b9a&#xff0c;\u540e\u7eed\u4efb\u4f55\u6d3e\u751f\u7c7b\u90fd\u4e0d\u5141\u8bb8\u4fee\u6539\u201d \u7684\u573a\u666f\u4e0b\u4f7f\u7528final&#xff08;\u5982\u6846\u67b6\u6838\u5fc3\u7c7b\u7684\u57fa\u7840\u63a5\u53e3&#xff09;&#xff0c;\u907f\u514d\u8fc7\u5ea6\u4f7f\u7528final\u9650\u5236\u7c7b\u7684\u6269\u5c55\u6027&#xff1b;<\/li>\n<li>\u907f\u514d\u6df7\u7528\u8bef\u533a&#xff1a;override\u548cfinal\u4e0d\u80fd\u540c\u65f6\u4fee\u9970\u540c\u4e00\u4e2a\u51fd\u6570&#xff08;\u56e0override\u7528\u4e8e \u201c\u786e\u8ba4\u91cd\u5199\u201d&#xff0c;final\u7528\u4e8e \u201c\u7981\u6b62\u91cd\u5199\u201d&#xff0c;\u903b\u8f91\u77db\u76fe&#xff09;&#xff0c;\u4f8b\u5982virtual void func() override final { &#8230; }\u662f\u9519\u8bef\u5199\u6cd5&#xff08;\u7f16\u8bd1\u5668\u62a5\u9519&#xff09;\u3002<\/li>\n<h4>\u516d\u3001\u603b\u7ed3&#xff1a;override \u4e0e final \u7684\u6838\u5fc3\u4ef7\u503c<\/h4>\n<ul>\n<li>override&#xff1a;\u5c06\u865a\u51fd\u6570\u91cd\u5199\u7684 \u201c\u9690\u6027\u9519\u8bef\u201d \u63d0\u524d\u5230\u7f16\u8bd1\u671f\u66b4\u9732&#xff0c;\u964d\u4f4e\u8c03\u8bd5\u6210\u672c&#xff0c;\u540c\u65f6\u63d0\u5347\u4ee3\u7801\u53ef\u8bfb\u6027&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>final&#xff1a;\u660e\u786e\u7981\u6b62\u57fa\u7c7b\u865a\u51fd\u6570\u88ab\u91cd\u5199&#xff0c;\u56fa\u5316\u6838\u5fc3\u903b\u8f91&#xff0c;\u907f\u514d\u540e\u7eed\u6d3e\u751f\u7c7b\u4e0d\u5f53\u4fee\u6539\u5bfc\u81f4\u7684\u98ce\u9669&#xff1b;<\/li>\n<\/ul>\n<ul>\n<li>\u4e8c\u8005\u5171\u540c\u89e3\u51b3\u4e86 C&#043;&#043; \u865a\u51fd\u6570\u91cd\u5199\u573a\u666f\u4e2d\u7684 \u201c\u6709\u6548\u6027\u68c0\u6d4b\u201d \u548c \u201c\u6743\u9650\u63a7\u5236\u201d \u95ee\u9898&#xff0c;\u662f C&#043;&#043;11 \u5bf9\u865a\u51fd\u6570\u673a\u5236\u7684\u91cd\u8981\u8865\u5145&#xff0c;\u4e5f\u662f\u5b9e\u9645\u5f00\u53d1\u4e2d\u89c4\u8303\u591a\u6001\u4ee3\u7801\u7684\u5fc5\u5907\u5de5\u5177\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e2a\u662f\u6bd4\u8f83\u7b80\u5355\u7684&#xff0c;\u5927\u5bb6\u8bb0\u4f4f\u4f7f\u7528\u65b9\u6cd5\u5c31\u884c&#xff0c;\u6bd5\u7adffinal\u5728\u6211\u4eec\u524d\u9762\u8bf4\u7ee7\u627f\u7684\u65f6\u5019&#xff0c;\u4e5f\u6709\u63d0\u5230\u3002<\/p>\n<p>OK\u5230\u4e86\u8fd9\u91cc&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5148\u4f11\u606f\u4f11\u606f&#xff0c;\u5269\u4e0b\u7684\u5185\u5bb9\u653e\u5728\u4e0b\u4e00\u7bc7\u535a\u5ba2\u8fdb\u884c\u8bb2\u89e3\u3002<\/p>\n<h2>\u7ed3\u8bed&#xff1a;\u6df1\u8015\u591a\u6001&#xff0c;\u6b65\u5c65\u4e0d\u505c<\/h2>\n<p>\u5f53\u6211\u4eec\u7ec8\u4e8e\u628a \u201c\u591a\u6001\u201d \u8fd9\u5ea7 C&#043;&#043; \u9762\u5411\u5bf9\u8c61\u7684 \u201c\u5c0f\u5c71\u4e18\u201d \u62c6\u89e3\u5230\u6700\u540e\u4e00\u4e2a\u77e5\u8bc6\u70b9&#xff0c;\u4ece\u7f16\u8bd1\u65f6\u591a\u6001\u7684\u51fd\u6570\u91cd\u8f7d\u4e0e\u6a21\u677f&#xff0c;\u5230\u8fd0\u884c\u65f6\u591a\u6001\u7684\u865a\u51fd\u6570\u4e0e\u91cd\u5199&#xff1b;\u4ece \u201c\u4e09\u540c\u201d \u89c4\u5219\u7684\u4e25\u82db\u7ec6\u8282&#xff0c;\u5230\u534f\u53d8\u7684\u7279\u6b8a\u4f8b\u5916&#xff1b;\u4ece\u865a\u6790\u6784\u51fd\u6570\u7684\u5185\u5b58\u5b89\u5168\u5b88\u62a4&#xff0c;\u5230 override \u4e0e final \u7684\u8bed\u6cd5\u89c4\u8303 \u2014\u2014 \u6b64\u523b\u518d\u56de\u5934\u770b&#xff0c;\u90a3\u4e9b\u66fe\u8ba9\u6211\u4eec\u53cd\u590d\u7422\u78e8\u7684\u4ee3\u7801\u793a\u4f8b\u3001\u7ea0\u7ed3\u8bb8\u4e45\u7684\u9009\u62e9\u9898\u7b54\u6848\u3001\u604d\u7136\u5927\u609f\u7684\u5e95\u5c42\u903b\u8f91&#xff0c;\u65e9\u5df2\u5728\u8111\u6d77\u4e2d\u7ec7\u6210\u4e00\u5f20\u6e05\u6670\u7684\u77e5\u8bc6\u7f51\u3002\u6216\u8bb8\u4f60\u8fd8\u8bb0\u5f97\u7b2c\u4e00\u6b21\u770b\u5230 \u201cB-&gt;1\u201d \u8fd9\u4e2a\u7b54\u6848\u65f6\u7684\u8be7\u5f02&#xff0c;\u8bb0\u5f97\u4e3a \u201c\u865a\u51fd\u6570\u7f3a\u7701\u503c\u9759\u6001\u7ed1\u5b9a\u201d \u6320\u5934\u7684\u65f6\u523b&#xff0c;\u8bb0\u5f97\u641e\u61c2 \u201c\u6790\u6784\u51fd\u6570\u91cd\u5199\u7279\u6b8a\u6027\u201d \u65f6\u7684\u8c41\u7136\u5f00\u6717&#xff0c;\u800c\u8fd9\u4e9b\u7ec6\u788e\u7684\u77ac\u95f4&#xff0c;\u6b63\u662f\u6211\u4eec\u5728\u7f16\u7a0b\u8def\u4e0a\u4e00\u6b65\u6b65\u6210\u957f\u7684\u5370\u8bb0\u3002<\/p>\n<p>\u5176\u5b9e\u5b66\u4e60\u591a\u6001\u7684\u8fc7\u7a0b&#xff0c;\u5c31\u50cf\u5728\u89e3\u9501\u4e00\u6b3e\u590d\u6742\u7684\u62fc\u56fe\u6e38\u620f\u3002\u6700\u5f00\u59cb&#xff0c;\u6211\u4eec\u53ea\u770b\u5230 \u201c\u591a\u79cd\u5f62\u6001\u201d \u8fd9\u4e2a\u6a21\u7cca\u7684\u62fc\u56fe\u5c01\u9762&#xff0c;\u4e0d\u77e5\u9053\u8be5\u4ece\u4f55\u4e0b\u624b&#xff1b;\u63a5\u7740\u6211\u4eec\u627e\u5230 \u201c\u7ee7\u627f\u201d \u8fd9\u5757\u6838\u5fc3\u5e95\u5ea7&#xff0c;\u660e\u767d\u6ca1\u6709\u7ee7\u627f\u5c31\u6ca1\u6709\u591a\u6001\u7684\u7acb\u8db3\u4e4b\u5730&#xff1b;\u7136\u540e\u6211\u4eec\u4e00\u7247\u7247\u62fc\u63a5 \u201c\u865a\u51fd\u6570\u201d\u201c\u91cd\u5199\u89c4\u5219\u201d\u201c\u52a8\u6001\u7ed1\u5b9a\u201d \u8fd9\u4e9b\u5173\u952e\u788e\u7247&#xff0c;\u6bcf\u62fc\u5bf9\u4e00\u5757&#xff0c;\u5c31\u79bb\u5b8c\u6574\u7684\u56fe\u666f\u66f4\u8fd1\u4e00\u6b65&#xff1b;\u76f4\u5230\u6700\u540e&#xff0c;\u6211\u4eec\u628a \u201c\u534f\u53d8\u201d\u201c\u865a\u6790\u6784\u51fd\u6570\u201d\u201coverride \u4e0e final\u201d \u8fd9\u4e9b\u8865\u5145\u788e\u7247\u4e00\u4e00\u5f52\u4f4d&#xff0c;\u624d\u771f\u6b63\u770b\u6e05\u591a\u6001\u7684\u5168\u8c8c \u2014\u2014 \u5b83\u4e0d\u53ea\u662f\u4e00\u4e2a\u8bed\u6cd5\u7279\u6027&#xff0c;\u66f4\u662f C&#043;&#043; \u5bf9 \u201c\u73b0\u5b9e\u4e16\u754c\u591a\u6837\u6027\u201d \u7684\u7cbe\u5999\u6a21\u62df&#xff0c;\u662f\u8ba9\u4ee3\u7801\u4ece 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