{"id":97689,"date":"2026-08-30T01:00:36","date_gmt":"2026-08-29T17:00:36","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97689.html"},"modified":"2026-08-30T01:00:36","modified_gmt":"2026-08-29T17:00:36","slug":"%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%ba%e7%90%86%e8%a7%a3%e8%ae%a1%e7%ae%97%e6%9c%ba%e6%a0%b8%e5%bf%83%e7%9f%a5%e8%af%86%e7%b3%bb%e5%88%97%e3%80%90c%e8%af%ad%e8%a8%80%e7%89%b9%e6%80%a7%e5%90%88","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97689.html","title":{"rendered":"\u6df1\u5165\u6d45\u51fa\u7406\u89e3\u8ba1\u7b97\u673a\u6838\u5fc3\u77e5\u8bc6\u7cfb\u5217\u3010C++\u8bed\u8a00\u7279\u6027\u5408\u96c6-\u8bed\u6cd5\u57fa\u7840\u4e0e\u62d3\u5c55\u7bc7\u3011"},"content":{"rendered":"<p>\u672c\u4eba\u5fd7\u5728\u6301\u7eed\u66f4\u65b0\u8ba1\u7b97\u673a\u7cfb\u7edf\u3001\u8ba1\u7b97\u673a\u7f51\u7edc\u3001C&#043;&#043;\u8bed\u8a00\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\u7684\u7cfb\u5217\u5408\u96c6&#xff0c;\u4ee5\u6613\u61c2\u3001\u5168\u9762\u7684\u65b9\u5f0f\u8bb2\u89e3\u5e95\u5c42\u77e5\u8bc6\u3002\u5bf9\u4e8e\u6b63\u5728\u51c6\u5907\u9762\u8bd5\u516b\u80a1\u7684\u670b\u53cb\u6765\u8bf4&#xff0c;\u672c\u7cfb\u5217\u6db5\u76d6\u4e86\u672c\u4eba\u9762\u8bd5\u4e2d\u9047\u5230\u7684\u6240\u6709\u8003\u70b9\u4ee5\u53ca\u8bb8\u591a\u76f8\u5173\u62d3\u5c55\u77e5\u8bc6&#xff0c;\u8bfb\u5b8c\u540e\u80fd\u5e2e\u52a9\u4f60\u4ece\u5bb9\u9762\u5bf9\u5927\u90e8\u5206\u9762\u8bd5\u62f7\u6253&#xff1b;\u5bf9\u4e8e\u60f3\u8981\u6df1\u5165\u5b66\u4e60\u8ba1\u7b97\u673a\u77e5\u8bc6\u7684\u670b\u53cb\u6765\u8bf4&#xff0c;\u672c\u7cfb\u5217\u6bd4\u8f83\u7cfb\u7edf\u5730\u4ecb\u7ecd\u4e86\u64cd\u4f5c\u7cfb\u7edf\u548c\u7f51\u7edc\u7b49\u91cd\u70b9\u5185\u5bb9&#xff0c;\u4e5f\u4e3e\u4e86\u4e0d\u5c11\u4f8b\u5b50&#xff0c;\u5927\u5927\u6709\u52a9\u4e8e\u4f60\u4ece\u5e95\u5c42\u7684\u89c6\u89d2\u53bb\u7406\u89e3\u8ba1\u7b97\u673a\u7cfb\u7edf\u3002<br \/>\n\u5148\u8bf4\u660e&#xff0c;\u672c\u7cfb\u5217\u6050\u6015\u4e0d\u662f\u8ba1\u7b97\u673a\u5c0f\u767d\u6216\u662f\u60f3\u901f\u901a\u671f\u672b\u7684\u670b\u53cb\u4eec\u7684\u76ee\u6807&#xff0c;\u5b83\u9700\u8981\u4e00\u5b9a\u7cfb\u7edf\u548c\u8bed\u8a00\u57fa\u7840&#xff0c;\u4e5f\u5e76\u4e0d\u662f\u9762\u5411\u6559\u6750\u548c\u8003\u8bd5\u8981\u6c42\u53bb\u8bb2\u89e3&#xff0c;\u6240\u4ee5\u66f4\u9002\u5408\u90a3\u4e9b\u5b9e\u64cd\u8fc7\u4ee3\u7801\u3001\u4e86\u89e3\u4e00\u4e9b\u8ba1\u7b97\u673a\u7cfb\u7edf\u77e5\u8bc6\u3001\u5e76\u4e14\u60f3\u8981\u6df1\u5165\u5e95\u5c42\u548c\u624e\u5b9e\u57fa\u7840\u7684\u670b\u53cb\u4eec\u53bb\u8010\u5fc3\u5b66\u4e60\u3002\u5982\u679c\u4f60\u662f\u8fd9\u6837\u7684\u4eba&#xff0c;\u6b22\u8fce\u9605\u8bfb\u8be5\u7cfb\u5217\u6587\u7ae0&#xff0c;\u5e76\u5206\u4eab\u81ea\u5df1\u7684\u7406\u89e3\u6216\u63d0\u51fa\u6587\u7ae0\u4e2d\u7684\u6a21\u7cca\u3001\u9519\u8bef\u7684\u5730\u65b9&#xff08;\u4e0d\u6392\u9664\u6709&#xff09;\u3002<br \/>\n\u60f3\u8981\u9605\u8bfb\u7cfb\u5217\u4e2d\u5176\u4ed6\u5185\u5bb9\u6216\u60f3\u8981\u6301\u7eed\u5173\u6ce8\u672c\u7cfb\u5217\u66f4\u65b0\u53ef\u79fb\u6b65&#xff1a;https:\/\/github.com\/feiyangyang11\/Cpp-Core-CS-Interview-Guide.git\u3002<\/p>\n<hr \/>\n<h2>C&#043;&#043; \u8bed\u6cd5\u57fa\u7840\u4e0e\u62d3\u5c55<\/h2>\n<p>\u672c\u7bc7\u65e2\u8bb2\u8ff0\u4e86\u4e00\u4e9b\u57fa\u672c\u7684 C&#043;&#043; \u8bed\u6cd5&#xff0c;\u53c8\u4ece\u5185\u5b58\u5e03\u5c40\u7684\u89c6\u89d2\u62d3\u5c55\u4e86\u4e00\u4e9b\u8bed\u6cd5\u7684\u5e95\u5c42\u673a\u5236<\/p>\n<h3>\u7c7b\u578b\u4e0e\u8868\u8fbe\u5f0f<\/h3>\n<p>C&#043;&#043; \u7c7b\u578b\u51b3\u5b9a\u4e00\u4e2a\u5b9e\u4f53\/\u8868\u8fbe\u5f0f\u5728 C&#043;&#043; \u8bed\u8a00\u4e2d\u7684\u8bed\u4e49&#xff0c;\u8868\u8fbe\u5f0f\u662f\u4e00\u6bb5\u53ef\u4ee5\u88ab\u6c42\u503c\u7684\u4ee3\u7801<\/p>\n<p>\u5b83\u4eec\u662f C&#043;&#043; \u5927\u53a6\u7684\u57fa\u77f3&#xff0c;\u540c\u65f6\u6709\u7740\u4e30\u5bcc\u7684\u542b\u4e49&#xff0c;\u975e\u5e38\u503c\u5f97\u4f5c\u4e3a\u6211\u4eec\u6df1\u5165\u8ba4\u8bc6 C&#043;&#043; \u7684\u7b2c\u4e00\u6b65<\/p>\n<h4>C&#043;&#043; \u57fa\u7840\u7c7b\u578b<\/h4>\n<p>\u4e3b\u8981\u6709 void\u3001\u7a7a\u7c7b\u578b\u3001\u6574\u578b\u3001\u6d6e\u70b9\u578b\u4e09\u7c7b&#xff0c;\u4e0d\u540c\u7c7b\u578b\u5360\u7528\u4e0d\u540c\u5927\u5c0f\u7684\u5185\u5b58\u3001\u6709\u7740\u4e0d\u540c\u7684\u8ba1\u7b97\u65b9\u5f0f<\/p>\n<p>\u9664\u4e86\u57fa\u7840\u7c7b\u578b\u5916&#xff0c;\u7a0b\u5e8f\u5458\u8fd8\u53ef\u4ee5\u81ea\u5df1\u5b9a\u4e49\u7c7b\u578b&#xff0c;\u8fd9\u91cc\u4e0d\u5c55\u5f00&#xff0c;\u540e\u9762\u4f1a\u8bb2<\/p>\n<p>fundamental types<span class=\"token comment\">\/\/\u5927\u5c0f\u4e3b\u8981\u4ee564\u4f4d\u7cfb\u7edf\u4e3a\u57fa\u51c6<\/span><br \/>\n\u251c\u2500\u2500 <span class=\"token keyword\">void<\/span><span class=\"token comment\">\/\/\u8868\u793a\u65e0\u5177\u4f53\u7c7b\u578b<\/span><br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 nullptr_t<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 integral types<br \/>\n\u2502   \u251c\u2500\u2500 <span class=\"token keyword\">bool<\/span><span class=\"token comment\">\/\/\u4e00\u5b57\u8282<\/span><br \/>\n\u2502   \u251c\u2500\u2500 <span class=\"token keyword\">char<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">signed<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span><span class=\"token comment\">\/\/\u4e00\u5b57\u8282<\/span><br \/>\n\u2502   \u251c\u2500\u2500 <span class=\"token keyword\">wchar_t<\/span><span class=\"token comment\">\/\/\u4e00\u5b57\u8282<\/span><br \/>\n\u2502   \u251c\u2500\u2500 <span class=\"token keyword\">char8_t<\/span><span class=\"token comment\">\/\/\u4e00\u5b57\u8282<\/span><br \/>\n\u2502   \u251c\u2500\u2500 <span class=\"token keyword\">char16_t<\/span><span class=\"token comment\">\/\/\u4e8c\u5b57\u8282<\/span><br \/>\n\u2502   \u251c\u2500\u2500 <span class=\"token keyword\">char32_t<\/span><span class=\"token comment\">\/\/\u56db\u5b57\u8282<\/span><br \/>\n\u2502   \u2514\u2500\u2500 <span class=\"token keyword\">short<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token comment\">\/\/\u4e8c\u5b57\u8282~\u516b\u5b57\u8282<\/span><br \/>\n\u2502<br \/>\n\u2514\u2500\u2500 floating<span class=\"token operator\">&#8211;<\/span>point types<br \/>\n    \u251c\u2500\u2500 <span class=\"token keyword\">float<\/span><span class=\"token comment\">\/\/\u56db\u5b57\u8282<\/span><br \/>\n    \u251c\u2500\u2500 <span class=\"token keyword\">double<\/span><span class=\"token comment\">\/\/\u516b\u5b57\u8282<\/span><br \/>\n    \u2514\u2500\u2500 <span class=\"token keyword\">long<\/span> <span class=\"token keyword\">double<\/span><\/p>\n<h4>\u8868\u8fbe\u5f0f<\/h4>\n<p>\u8868\u8fbe\u5f0f\u662f\u4e00\u6bb5\u53ef\u4ee5\u88ab\u6c42\u503c\u7684\u4ee3\u7801<\/p>\n<p>\u6bd4\u5982&#xff1a;<\/p>\n<p><span class=\"token number\">10<\/span><br \/>\na<br \/>\na <span class=\"token operator\">&#043;<\/span> b<span class=\"token comment\">\/\/\u8ba1\u7b97\u8868\u8fbe\u5f0f    <\/span><br \/>\n<span class=\"token function\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/\u51fd\u6570\u8c03\u7528\u8868\u8fbe\u5f0f<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token comment\">\/\/\u8d4b\u503c\u8868\u8fbe\u5f0f&#xff0c;\u8868\u8fbe\u5f0f\u7684\u503c\u5c31\u662f a \u88ab\u8d4b\u503c\u540e\u7684\u503c<\/span><\/p>\n<h4>\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b<\/h4>\n<p>\u8868\u8fbe\u5f0f\u540c\u6837\u5177\u6709\u7c7b\u578b&#xff0c;\u5b83\u7684\u7c7b\u578b\u53d6\u51b3\u4e8e\u8868\u8fbe\u5f0f\u7ec4\u6210\u6210\u5458\u7684\u7c7b\u578b<\/p>\n<p>\u6bd4\u5982 a&#043;b&#xff0c;\u5982\u679c a \u548c b \u7c7b\u578b\u4e0d\u540c&#xff0c;C&#043;&#043; \u4f1a\u4f18\u5148\u8003\u8651\u8f6c\u6362\u7c7b\u578b&#xff0c;\u5c06\u8868\u8fbe\u5f0f\u4e2d\u6240\u6709\u5b50\u8868\u8fbe\u5f0f\u5148\u8f6c\u6362\u6210\u540c\u4e00\u7c7b\u578b&#xff0c;\u8f6c\u6362\u89c4\u5219\u662f\u5c0f\u7c7b\u578b\u9002\u914d\u5927\u7c7b\u578b\u3002\u82e5 a \u662f int&#xff08;4\u5b57\u8282&#xff09;&#xff0c;b \u662f double&#xff08;8\u5b57\u8282&#xff09;&#xff0c;\u5c31\u4f1a\u628a a \u8f6c\u6362\u6210 double&#xff0c;\u7136\u540e\u6574\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u7c7b\u578b\u5c31\u662f double<\/p>\n<h4>\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/h4>\n<p>\u8868\u8fbe\u5f0f\u5b58\u5728\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362&#xff0c;\u6709\u4e00\u4e9b\u5e38\u89c1\u7684\u7279\u6b8a\u8868\u73b0\u5982\u4e0b&#xff1a;<\/p>\n<p>\u6574\u6570\u63d0\u5347&#xff1a;char &#043; char \u6216 short &#043; short&#xff0c;\u4f1a\u5148\u5c06\u4e24\u4e2a\u6570\u90fd\u53d8\u6210 int \u540e\u518d\u76f8\u52a0&#xff0c;\u7ed3\u679c\u4e5f\u662f int<\/p>\n<p>signed \/ unsigned \u6df7\u5408&#xff1a;\u5bf9 signed \u548c unsigned \u8fdb\u884c\u6bd4\u8f83\u8fd0\u7b97\u65f6&#xff0c;signed \u4f1a\u88ab\u8f6c\u6362\u6210 unsigned int&#xff0c;\u53ef\u80fd\u5bfc\u81f4\u503c\u53d8\u5927&#xff0c;\u7ed3\u679c\u9519\u8bef<\/p>\n<p>size()&#xff1a;vector\u3001string \u7b49\u7684 size()\u51fd\u6570\u8fd4\u56de\u7684\u90fd\u662f\u65e0\u7b26\u53f7\u6574\u578b&#xff0c;\u8fd9\u70b9\u8981\u6ce8\u610f<\/p>\n<h4>\u8868\u8fbe\u5f0f\u7684\u6027\u8d28<\/h4>\n<p>\u8868\u8fbe\u5f0f\u9664\u4e86\u6709\u7c7b\u578b&#xff0c;\u8fd8\u6709\u6027\u8d28\u3002\u4e3b\u8981\u5206\u4e3a\u5de6\u503c\u3001\u53f3\u503c<\/p>\n<p>\u7c7b\u578b\u76f8\u540c&#xff0c;\u4e0d\u4ee3\u8868\u8868\u8fbe\u5f0f\u6027\u8d28\u76f8\u540c<\/p>\n<ul>\n<li>\u5de6\u503c\u6307\u7684\u662f\u80fd\u88ab\u7a33\u5b9a\u53d6\u5730\u5740\u3001\u751f\u547d\u5468\u671f\u786e\u5b9a\u3001\u6709\u540d\u5b57\u7684\u8868\u8fbe\u5f0f&#xff0c;\u6bd4\u5982 int x<\/li>\n<li>\u53f3\u503c\u6307\u7684\u662f\u4e0d\u80fd\u88ab\u7a33\u5b9a\u53d6\u5730\u5740\u3001\u751f\u547d\u5468\u671f\u4e0d\u786e\u5b9a\u3001\u533f\u540d\u7684\u8868\u8fbe\u5f0f&#xff0c;\u6bd4\u5982 x &#043; 1\u300110\u3001new object()<\/li>\n<\/ul>\n<p>\u5de6\u503c\u3001\u53f3\u503c\u53c8\u53ef\u4ee5\u88ab\u7ec6\u5206\u4e3a\u4e00\u4e0b\u51e0\u79cd<\/p>\n<p>expression<br \/>\n\u251c\u2500\u2500 glvalue<span class=\"token comment\">\/\/\u5de6\u503c<\/span><br \/>\n\u2502   \u251c\u2500\u2500 lvalue<span class=\"token comment\">\/\/\u7eaf\u6b63\u7684\u5de6\u503c\u3002\u80fd\u88ab\u7a33\u5b9a\u53d6\u5730\u5740\u3001\u751f\u547d\u5468\u671f\u786e\u5b9a\u3001\u6709\u540d\u5b57&#xff0c;\u6211\u4eec\u4ee3\u7801\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf int x; \u5c31\u5c5e\u4e8e\u8fd9\u79cd<\/span><br \/>\n\u2502   \u2514\u2500\u2500 xvalue<span class=\"token comment\">\/\/\u5c06\u4ea1\u503c\u3002\u4e5f\u80fd\u88ab\u7a33\u5b9a\u53d6\u5730\u5740\u3001\u751f\u547d\u5468\u671f\u786e\u5b9a\u3001\u6709\u540d\u5b57&#xff0c;\u4f46\u662f\u5141\u8bb8\u8d44\u6e90\u88ab\u8f6c\u79fb\u51fa\u53bb&#xff0c;\u5178\u578b\u5c06\u4ea1\u503c\u5982 std::move(x)<\/span><br \/>\n\u2502<br \/>\n\u2514\u2500\u2500 rvalue<span class=\"token comment\">\/\/\u53f3\u503c<\/span><br \/>\n    \u251c\u2500\u2500 xvalue<span class=\"token comment\">\/\/\u5c06\u4ea1\u503c\u3002<\/span><br \/>\n    \u2514\u2500\u2500 prvalue<span class=\"token comment\">\/\/\u7528\u6765\u4ea7\u751f\u503c\/\u521d\u59cb\u5316\u5bf9\u8c61&#xff0c;\u5982 42\u3001a &#043; b<\/span><\/p>\n<p>\u5de6\u503c\u3001\u53f3\u503c\u5e38\u89c1\u7684\u4f5c\u7528\u5c31\u662f\u642d\u914d\u5f15\u7528\u7b49\u8fdb\u884c\u8d44\u6e90\u7684\u8f6c\u79fb\u548c\u590d\u7528&#xff0c;\u540e\u9762\u518d\u8be6\u7ec6\u5c55\u5f00<\/p>\n<h3>\u6307\u9488<\/h3>\n<p>\u6307\u9488\u662f\u4e00\u4e2a\u6808\u4e0a\u7684\u53d8\u91cf&#xff0c;\u5b83\u4fdd\u5b58\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740<\/p>\n<p>\u5982int* p&#061;&amp;a;\u8868\u793a\u53d8\u91cf p \u4fdd\u5b58\u4e86\u53d8\u91cf a \u7684\u5185\u5b58\u5730\u5740&#xff08;\u6808\u4e0a\u6216\u5806\u4e0a&#xff09;<\/p>\n<p>\u56e0\u6b64\u901a\u8fc7\u6307\u9488\u53d8\u91cf\u53ef\u4ee5\u8bbf\u95ee\u5b83\u6307\u5411\u7684\u53d8\u91cf<\/p>\n<p>64 \u4f4d\u73af\u5883\u4e2d&#xff0c;\u6307\u9488\u53d8\u91cf\u672c\u8eab\u4e00\u822c\u662f\u5360 8 \u5b57\u8282\u5927\u5c0f<\/p>\n<h4>\u89e3\u5f15\u7528<\/h4>\n<p>*\u662f\u89e3\u5f15\u7528\u7b26\u53f7&#xff0c;*p\u8868\u793a\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61\u672c\u8eab<\/p>\n<p>\u6216\u8005\u7406\u89e3\u6210\u6307\u5411\u7684\u90a3\u7247\u5185\u5b58\u5730\u5740&#xff0c;\u4fee\u6539*p\u5c31\u8868\u793a\u76f4\u63a5\u4fee\u6539\u90a3\u7247\u5185\u5b58\u4e2d\u7684\u6570\u636e&#xff0c;\u81ea\u7136\u5c31\u4fee\u6539\u4e86\u8be5\u53d8\u91cf<\/p>\n<p>\u6307\u9488\u53d8\u91cf\u7684\u7c7b\u578b\u63cf\u8ff0\u4e86\u201c\u8fd9\u4e2a\u5730\u5740\u6240\u6307\u5411\u5bf9\u8c61\u7684\u7c7b\u578b\u201d&#xff0c;\u7528\u4e8e\u9650\u5236\u8bbf\u95ee\u8fd9\u7247\u5185\u5b58\u65f6\u600e\u4e48\u89e3\u91ca\u8fd9\u7247\u5185\u5b58<\/p>\n<p>int*p&#061;&amp;a;\u8868\u793a\u7528*p\u8bbf\u95eea\u6240\u5728\u5185\u5b58\u65f6&#xff0c;\u5c06\u5b83\u89e3\u91ca\u4e3a int \u7c7b\u578b&#xff0c;\u8bfb 4 \u4e2a\u5b57\u8282<\/p>\n<h4>\u60ac\u7a7a\u6307\u9488\u4e0e\u7a7a\u6307\u9488<\/h4>\n<p>\u60ac\u7a7a\u6307\u9488&#xff0c;\u610f\u601d\u662f\u6307\u9488\u53d8\u91cf\u6ca1\u6709\u7ed1\u5b9a\u6709\u6548\u7684\u5730\u5740&#xff0c;\u6216\u7ed1\u5b9a\u4e86\u5bf9\u8c61\u5730\u5740\u540e\u5bf9\u8c61\u88ab\u9500\u6bc1&#xff0c;\u6b64\u65f6\u6307\u9488\u53d8\u91cf\u4fdd\u5b58\u7684\u5c31\u662f\u5783\u573e\u503c<\/p>\n<p>\u7a7a\u6307\u9488&#xff0c;nullptr&#xff0c;\u503c\u4e3a 0&#xff0c;\u662f\u8fdb\u7a0b\u865a\u62df\u5730\u5740\u7684\u8d77\u5740&#xff0c;\u7981\u6b62\u8bbf\u95ee&#xff0c;\u89e3\u5f15\u7528\u4f1a\u62a5\u9519<\/p>\n<h3>\u5f15\u7528<\/h3>\n<p>\u5f15\u7528\u662f\u5df2\u6709\u5bf9\u8c61\u7684\u522b\u540d\u3002\u5b83\u4e0d\u5728\u5185\u5b58\u4e0a\u521b\u5efa\u65b0\u7684\u503c\u5bf9\u8c61&#xff0c;\u800c\u662f\u8ba9\u53e6\u4e00\u4e2a\u540d\u5b57\u7ed1\u5b9a\u5230\u539f\u5bf9\u8c61&#xff0c;\u5982\u4e0b&#xff1a;<\/p>\n<p>a   \u2500\u2510<br \/>\n     \u251c\u2500\u2500 \u540c\u4e00\u4e2a int \u5bf9\u8c61<br \/>\nref \u2500\u2518<\/p>\n<p>\u548c\u6307\u9488\u7684\u5b9e\u9645\u610f\u4e49\u5dee\u4e0d\u591a&#xff0c;\u672c\u8d28\u90fd\u662f\u8bbf\u95ee\u540c\u4e00\u7247\u5185\u5b58\u533a\u57df&#xff0c;\u4e0d\u8fc7\u8bbf\u95ee\u65f6\u4e0d\u9700\u8981\u89e3\u5f15\u7528<\/p>\n<h4>\u5de6\u503c\u5f15\u7528T&amp;<\/h4>\n<p>\u521b\u5efa\u4e00\u4e2a\u5f15\u7528\u53d8\u91cf&#xff0c;\u7ed1\u5b9a\u5230\u4e00\u4e2a\u5de6\u503c\u8868\u8fbe\u5f0f<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token operator\">&amp;<\/span> ref <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;<\/p>\n<p>\u5de6\u503c\u5f15\u7528\u4e0d\u80fd\u7ed1\u5b9a\u5230\u53f3\u503c&#xff0c;\u5982int&amp; ref &#061; 10;&#xff0c;\u4f46 const T&amp; \u53ef\u4ee5\u7ed1\u5b9a\u53f3\u503c&#xff08;\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4f1a\u53d1\u751f\u751f\u547d\u5468\u671f\u5ef6\u957f&#xff09;<\/p>\n<p>\u53ef\u4ee5\u7528\u5e38\u91cf\u5de6\u503c\u5f15\u7528\u7ed1\u5b9a\u5230\u5de6\u503c&#xff0c;\u5982const int&amp; ref &#061; a;&#xff0c;\u8868\u793a\u4ee5\u53ea\u8bfb\u65b9\u5f0f\u5f15\u7528\u5bf9\u8c61<\/p>\n<h4>\u53f3\u503c\u5f15\u7528T&amp;&amp;<\/h4>\n<p>\u521b\u5efa\u4e00\u4e2a\u5f15\u7528\u53d8\u91cf&#xff0c;\u7ed1\u5b9a\u5230\u4e00\u4e2a\u53f3\u503c\u8868\u8fbe\u5f0f<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token operator\">&amp;&amp;<\/span> ref <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53f3\u503c\u5f15\u7528\u4e3b\u8981\u670d\u52a1\u4e8e\u79fb\u52a8\u8bed\u4e49\u3001\u5b8c\u7f8e\u8f6c\u53d1&#xff0c;\u540e\u9762\u7ec6\u8bb2<\/p>\n<h4>\u5f15\u7528\u6298\u53e0\u4e0e\u5b8c\u7f8e\u8f6c\u53d1<\/h4>\n<p>C&#043;&#043; \u89c4\u5b9a\u4e86\u4e00\u5957\u89c4\u5219&#xff0c;\u7528\u6765\u5904\u7406\u201c\u5f15\u7528\u548c\u5f15\u7528\u53e0\u5728\u4e00\u8d77\u201d\u7684\u60c5\u51b5&#xff0c;\u56e0\u4e3a**\u6a21\u677f\u7c7b\u578b\u63a8\u5bfc\u3001typedef\u3001using \u7b49\u573a\u666f\u4e0b&#xff0c;\u7f16\u8bd1\u5668\u5185\u90e8\u53ef\u80fd\u7ec4\u5408\u51fa\u8fd9\u79cd\u201c\u5f15\u7528\u7684\u5f15\u7528\u201d**\u8fd9\u79cd\u60c5\u51b5\u3002\u89c4\u5b9a\u4e24\u5c42\u5f15\u7528\u78b0\u5230\u4e00\u8d77&#xff0c;\u6700\u540e\u5e94\u8be5\u53d8\u6210\u4ec0\u4e48&#xff0c;\u8fd9\u5c31\u662f\u5f15\u7528\u6298\u53e0<\/p>\n<p>\u6a21\u677f\u63a8\u5bfc\/\u522b\u540d\u5c55\u5f00\u540e\u51fa\u73b0\u5f15\u7528\u7684\u5f15\u7528\u65f6&#xff0c;\u89c4\u5219\u662f&#xff1a;<\/p>\n<p>T<span class=\"token operator\">&amp;<\/span>  <span class=\"token operator\">&amp;<\/span>   \u2192 T<span class=\"token operator\">&amp;<\/span><br \/>\nT<span class=\"token operator\">&amp;<\/span>  <span class=\"token operator\">&amp;&amp;<\/span>  \u2192 T<span class=\"token operator\">&amp;<\/span><br \/>\nT<span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">&amp;<\/span>   \u2192 T<span class=\"token operator\">&amp;<\/span><br \/>\nT<span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">&amp;&amp;<\/span>  \u2192 T<span class=\"token operator\">&amp;&amp;<\/span><br \/>\n<span class=\"token comment\">\/\/\u53ea\u8981\u6709\u4e00\u4e2a\u662f\u5de6\u503c\u5f15\u7528&#xff0c;\u6298\u53e0\u540e\u5c31\u662f\u5de6\u503c\u5f15\u7528<\/span><br \/>\n<span class=\"token comment\">\/\/\u53ea\u6709\u4e24\u4e2a\u90fd\u662f\u53f3\u503c\u5f15\u7528&#xff0c;\u6298\u53e0\u540e\u624d\u662f\u53f3\u503c\u5f15\u7528<\/span><\/p>\n<p>\u4ee5 std::move \u4e3a\u4f8b\u8bb2\u89e3<\/p>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">T<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">constexpr<\/span> std<span class=\"token double-colon punctuation\">::<\/span>remove_reference_t<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>T<span class=\"token operator\">&amp;&amp;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">noexcept<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token generic-function\"><span class=\"token function\">static_cast<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>remove_reference_t<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;&amp;<\/span><span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/\u5047\u8bbe\u5916\u90e8\u4f20\u5165\u7684\u662f int x&#xff1b;\u5b83\u7684\u7c7b\u578b\u662f int&#xff0c;\u7c7b\u522b\u662f\u5de6\u503c<\/span><br \/>\n<span class=\"token comment\">\/\/\u53c2\u6570\u8fdb\u5165 move&#xff0c;\u56e0\u4e3a\u628a\u5de6\u503c\u4f20\u7ed9\u8f6c\u53d1\u5f15\u7528 T&amp;&amp;&#xff0c;\u6240\u4ee5\u6a21\u677f\u63a8\u5bfc\u5f97\u5230 T &#061; int&amp;<\/span><br \/>\n<span class=\"token comment\">\/\/\u6839\u636e\u5f15\u7528\u6298\u53e0\u89c4\u5219\u628a T&amp;&amp; &amp; \u6298\u53e0\u6210 T&amp;&#xff0c;\u6240\u4ee5\u53ef\u77e5\u6b64\u65f6 t \u7c7b\u578b\u662f\u5de6\u503c\u5f15\u7528 int&amp;&#xff0c;\u7c7b\u522b\u662f\u5de6\u503c<\/span><br \/>\n<span class=\"token comment\">\/\/remove_reference_t \u5c06\u5f15\u7528\u53bb\u6389&#xff0c;\u5f97\u5230 int \u7c7b\u578b&#xff0c;\u7136\u540e\u6b64\u5904\u5c31\u53d8\u6210\u4e86 return static_cast&lt;int&amp;&amp;&gt;(t);<\/span><br \/>\n<span class=\"token comment\">\/\/\u4e5f\u5c31\u662f\u5c06 t \u5f3a\u8f6c\u6210\u4e86\u53f3\u503c\u5f15\u7528 int&amp;&amp; \u7c7b\u578b&#xff0c;\u6240\u4ee5 move \u8fd4\u56de\u7684\u5c31\u662f\u4e00\u4e2a\u53f3\u503c\u5f15\u7528<\/span><\/p>\n<p>\u4ec0\u4e48\u662f\u5b8c\u7f8e\u8f6c\u53d1&#xff1f;\u5c31\u662f\u628a\u4e00\u4e2a\u53c2\u6570\u201c\u539f\u5c01\u4e0d\u52a8\u5730\u201d\u7ee7\u7eed\u4f20\u7ed9\u4e0b\u4e00\u4e2a\u51fd\u6570&#xff0c;\u65e2\u4fdd\u7559\u5b83\u7684\u7c7b\u578b&#xff0c;\u4e5f\u4fdd\u7559\u5b83\u662f\u5de6\u503c\u5f15\u7528\u8fd8\u662f\u53f3\u503c\u5f15\u7528&#xff0c;\u4f9d\u9760\u7684\u662f\u6a21\u677f\u7c7b\u578b\u63a8\u5bfc &#043; \u5f15\u7528\u6298\u53e0 &#043; std::forward&#xff0c;\u6bd4\u5982&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/\u5199\u4e00\u4e2a\u5305\u88c5\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">T<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">Wrapper<\/span><span class=\"token punctuation\">(<\/span>T<span class=\"token operator\">&amp;&amp;<\/span> value<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">\/\/\u7531\u4e8e\u5f15\u7528\u6298\u53e0\u7684\u5b58\u5728&#xff0c;\u4fdd\u8bc1\u4e86\u4f20\u5165\u7684 value \u5982\u679c\u539f\u6765\u662f\u5de6\u503c\u90a3\u5728\u8fd9\u91cc\u662f\u5de6\u503c\u5f15\u7528&#xff0c;\u5982\u679c\u539f\u6765\u662f\u53f3\u503c\u5728\u8fd9\u91cc\u662f\u53f3\u503c\u5f15\u7528<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">forward<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/\u4f46\u662f value \u672c\u8eab\u662f\u4e2a\u5de6\u503c&#xff0c;\u6240\u4ee5\u518d\u5f80\u4e0b\u76f4\u63a5 Func(value)&#xff0c;\u90a3\u4e48\u5728\u4e0b\u4e00\u5c42\u53c2\u6570\u5c31\u4e00\u5b9a\u4f1a\u88ab\u63a8\u5bfc\u4e3a\u5de6\u503c\u5f15\u7528&#xff0c;\u8fd9\u4e0d\u7b26\u5408\u5b8c\u7f8e\u8f6c\u53d1<\/span><br \/>\n<span class=\"token comment\">\/\/\u6240\u4ee5\u5f15\u5165 std::forward&lt;T&gt;(value)\u3002\u5b83\u5185\u90e8\u505a\u7684\u662f&#xff0c;\u6839\u636e T \u53bb\u8fd8\u539f\u5f15\u7528\u72b6\u6001<\/span><br \/>\n<span class=\"token comment\">\/\/\u8fd9\u91cc\u4ee5\u5916\u90e8\u8c03\u7528 \u2460 std::string s;Wrapper(s); \u548c \u2461 Wrapper(std::string(&#034;hello&#034;)); \u4e3a\u4f8b&#xff0c;forward \u7684\u6e90\u7801\u5982\u4e0b&#xff1a;<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">T<\/span><span class=\"token operator\">&gt;<\/span><br \/>\nT<span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token function\">forward<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>remove_reference_t<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> value<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token generic-function\"><span class=\"token function\">static_cast<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&amp;&amp;<\/span><span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/1. \u5982\u679c value \u662f\u5de6\u503c&#xff0c;\u90a3\u4e48\u63a8\u5bfc\u4e3a T &#061; std::string&amp;<\/span><br \/>\n<span class=\"token comment\">\/\/\u5728 forward \u5185 value \u88ab\u5f3a\u8f6c\u4e3a std::string&amp; &amp;&amp;&#xff0c;\u6298\u53e0\u4e3a std::string&amp;&#xff0c;\u5373\u8fd4\u56de\u4e00\u4e2a\u5de6\u503c\u5f15\u7528<\/span><br \/>\n<span class=\"token comment\">\/\/2. \u5982\u679c value \u662f\u53f3\u503c&#xff0c;\u90a3\u4e48\u63a8\u5bfc\u4e3a T &#061; std::string<\/span><br \/>\n<span class=\"token comment\">\/\/\u5728 forward \u5185 value \u88ab\u5f3a\u8f6c\u4e3a std::string&amp;&amp;&#xff0c;\u5373\u8fd4\u56de\u4e00\u4e2a\u53f3\u503c\u5f15\u7528<\/span><br \/>\n<span class=\"token comment\">\/\/\u90a3\u4e48\u8fd9\u6837\u4f20\u7ed9 func \u7684\u53c2\u6570\u7684\u5f15\u7528\u6027\u8d28\u5c31\u6ca1\u53d8&#xff0c;\u8fbe\u6210\u4e86\u5b8c\u7f8e\u8f6c\u53d1<\/span><\/p>\n<h4>\u548c\u6307\u9488\u7684\u533a\u522b<\/h4>\n<p>\u5f15\u7528\u5fc5\u987b\u521d\u59cb\u5316\u3002\u56e0\u4e3a\u5f15\u7528\u7684\u610f\u4e49\u5c31\u662f\u67d0\u4e2a\u5bf9\u8c61\u7684\u522b\u540d&#xff0c;\u6240\u4ee5\u5b9a\u4e49\u65f6\u4e00\u5b9a\u8981\u7ed1\u5b9a\u67d0\u4e2a\u5bf9\u8c61&#xff0c;\u4e0d\u80fd\u60ac\u7a7a<\/p>\n<p>\u5f15\u7528\u7ed1\u5b9a\u4ee5\u540e\u4e0d\u80fd\u6539\u7ed1&#xff0c;\u8fd9\u662f\u5f15\u7528\u548c\u6307\u9488\u975e\u5e38\u91cd\u8981\u7684\u533a\u522b<\/p>\n<p>\u5f15\u7528\u4e0d\u80fd\u4e3a\u7a7a<\/p>\n<p>\u5f15\u7528\u53d8\u91cf\u672c\u8eab\u4e0d\u62e5\u6709\u72ec\u7acb\u5185\u5b58&#xff0c;\u4f46\u6307\u9488\u53d8\u91cf\u901a\u5e38\u81ea\u5df1\u62e5\u6709 8 \u5b57\u8282\u5927\u5c0f\u5185\u5b58\u3002\u7f16\u8bd1\u5668\u4f18\u5316\u65f6\u53ef\u80fd\u5c06\u5f15\u7528\u53d8\u91cf\u76f4\u63a5\u66ff\u6362\u6210\u88ab\u5f15\u7528\u5bf9\u8c61\u672c\u8eab<\/p>\n<h3>\u7c7b\u4e0e\u5bf9\u8c61<\/h3>\n<p>\u7c7b&#xff1a;\u7a0b\u5e8f\u5458\u81ea\u5b9a\u4e49\u7684\u4e00\u79cd\u7c7b\u578b&#xff0c;\u7528\u6765\u63cf\u8ff0\u4e00\u7c7b\u5bf9\u8c61\u6709\u54ea\u4e9b\u6570\u636e&#xff0c;\u4ee5\u53ca\u80fd\u8fdb\u884c\u54ea\u4e9b\u64cd\u4f5c\u3002<\/p>\n<p>\u5bf9\u8c61&#xff1a;\u67d0\u4e2a\u7c7b\u5b9e\u9645\u521b\u5efa\u51fa\u6765\u7684\u4e00\u4e2a\u5177\u4f53\u5b9e\u4f8b&#xff0c;\u5b83\u771f\u6b63\u5360\u7528\u5185\u5b58&#xff0c;\u5e76\u62e5\u6709\u81ea\u5df1\u7684\u6210\u5458\u6570\u636e<\/p>\n<h4>this \u6307\u9488<\/h4>\n<p>\u6bcf\u4e2a\u5bf9\u8c61\u88ab\u521b\u5efa\u65f6\u4f1a\u5e26\u4e0a\u4e00\u4e2a this \u6307\u9488&#xff0c;\u8868\u793a\u5bf9\u8c61\u5185\u5b58\u8d77\u5740\u3002\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u81ea\u5df1\u7684 this \u6307\u9488<\/p>\n<p>\u8c03\u7528\u6210\u5458\u51fd\u6570\u6216\u8bbf\u95ee\u6210\u5458\u53d8\u91cf\u65f6&#xff0c;\u90fd\u662f\u901a\u8fc7 this \u6307\u9488\u8bbf\u95ee\u7684<\/p>\n<p><span class=\"token comment\">\/\/\u6210\u5458\u51fd\u6570\u4e2d&#xff1a;<\/span><br \/>\nhp <span class=\"token operator\">&#061;<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u53ef\u4ee5\u7406\u89e3\u4e3a&#xff1a;<\/span><br \/>\n<span class=\"token keyword\">this<\/span><span class=\"token operator\">-&gt;<\/span>hp <span class=\"token operator\">&#061;<\/span> value<span class=\"token punctuation\">;<\/span><\/p>\n<p>Player a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u5916\u90e8\u8c03\u7528&#xff1a;<\/span><br \/>\na<span class=\"token punctuation\">.<\/span><span class=\"token function\">SetHP<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u53ef\u4ee5\u7406\u89e3\u4e3a&#xff1a;<\/span><br \/>\n<span class=\"token class-name\">Player<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">SetHP<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>class \u548c struct<\/h4>\n<p>\u552f\u4e00\u533a\u522b\u662f&#xff0c;class \u6210\u5458\u9ed8\u8ba4\u662f protected \u6743\u9650&#xff0c;struct \u6210\u5458\u9ed8\u8ba4\u662f public \u6743\u9650<\/p>\n<h4>const \u6210\u5458\u51fd\u6570<\/h4>\n<p>\u6210\u5458\u51fd\u6570\u52a0 const \u4fee\u9970&#xff0c;\u4f1a\u9650\u5236\u4fee\u6539\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf&#xff0c;\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Player<\/span><span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token function\">GetHP<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/\/\u8be5\u51fd\u6570\u5185\u7981\u6b62\u4fee\u6539\u6210\u5458\u53d8\u91cf hp<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> hp<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> hp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u666e\u901a\u6210\u5458\u51fd\u6570\u4e2d\u7684 this \u53ef\u4ee5\u7406\u89e3\u4e3a Player* const this&#xff0c;\u8868\u793a\u4e0d\u53ef\u6539\u53d8 this \u7684\u6307\u5411<\/p>\n<p>\u800c const \u6210\u5458\u51fd\u6570\u4e2d\u7684 this \u662f const Player* const this&#xff0c;\u8868\u793a\u65e2\u4e0d\u53ef\u6539\u53d8 this \u7684\u6307\u5411&#xff0c;\u4e5f\u4e0d\u53ef\u6539\u53d8 this \u6307\u5411\u7684\u53d8\u91cf\u7684\u503c<\/p>\n<h4>\u5bf9\u8c61\u7684\u5185\u5b58\u5bf9\u9f50<\/h4>\n<p>\u7c7b\u6210\u5458\u7684\u4e0d\u540c\u6392\u5e03\u987a\u5e8f&#xff0c;\u4f1a\u5f71\u54cd\u5bf9\u8c61\u7684\u5185\u5b58\u5927\u5c0f&#xff0c;\u56e0\u4e3a\u8981\u9075\u5faa\u5185\u5b58\u5bf9\u9f50\u539f\u5219&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/\u987a\u5e8f1&#xff1a;sizeof(A) &#061;&#061; 12<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> d<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u987a\u5e8f2&#xff1a;sizeof(A) &#061;&#061; 8<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> d<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u4f1a\u4ea7\u751f\u8fd9\u6837\u7684\u5dee\u5f02&#xff1f;\u57fa\u4e8e\u4e0a\u8ff0\u4e24\u4f8b\u5b50\u5206\u6790&#xff1a;<\/p>\n<p>\u7c7b\u9700\u8981\u5185\u5b58\u5bf9\u9f50&#xff0c;\u5176\u5bf9\u9f50\u8981\u6c42\u901a\u5e38\u7b49\u4e8e\u5176\u6210\u5458\u4e2d\u6700\u5927\u7684\u5bf9\u9f50\u8981\u6c42<\/p>\n<ul>\n<li>int \u8981\u6c42 4 \u5b57\u8282\u5bf9\u9f50&#xff0c;\u8868\u793a\u8981\u6c42\u4efb\u4f55\u4e00\u4e2a int \u53d8\u91cf\u7684\u8d77\u5740 % 4 &#061; 0<\/li>\n<li>char \u8981\u6c42 1 \u5b57\u8282\u5bf9\u9f50&#xff0c;\u8868\u793a\u8981\u6c42\u4efb\u4f55\u4e00\u4e2a char\u53d8\u91cf\u7684\u8d77\u5740 % 4 &#061; 0<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u5bf9\u4e8e\u987a\u5e8f 1&#xff0c;\u5728\u5b9a\u4e49A a;\u65f6\u4f1a\u586b\u5145\u5b57\u8282\u4ee5\u5bf9\u9f50&#xff1a;<\/p>\n<p>offset 0<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502 char c      \u2502 1<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 padding     \u2502 3<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 int x       \u2502 4<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n\u2502 char d      \u2502 1<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 padding     \u2502 3<br \/>\noffset 12<\/p>\n<p>\u586b\u5145\u4e86\u4e24\u5904&#xff1a;<\/p>\n<li>\u7b2c\u4e00\u5904\u662f\u4e3a\u4e86 int \u7684\u8d77\u5740\u5bf9\u9f50&#xff0c;\u586b\u5145\u4e86 3 \u5b57\u8282<\/li>\n<li>\u7b2c\u4e8c\u5904\u662f\u4e3a\u4e86\u7c7b\u5bf9\u8c61\u5bf9\u9f50&#xff0c;\u586b\u5145\u4e86 3 \u5b57\u8282\u3002\u4e3b\u8981\u662f\u4e3a\u4e86\u517c\u5bb9A a[5];\u8fd9\u79cd\u60c5\u51b5\u3002\u5982\u679c\u53ea\u5bf9\u9f50\u4e86\u7b2c\u4e00\u5904&#xff0c;\u53ef\u80fd\u7b26\u5408a[0].x % 4 &#061;&#061; 0&#xff0c;\u4f46\u7531\u4e8e\u672b\u5c3e\u6709 char \u4e14\u6ca1\u6709\u586b\u5145&#xff0c;\u6240\u4ee5a[0].d % 4 &#061;&#061; 1&#xff0c;\u5bfc\u81f4a[1] % 4 &#061;&#061; 1&#xff0c;\u6700\u7ec8\u5bfc\u81f4a[1].x % 4 &#061;&#061; (a[1] &#043; 4) % 4 &#061;&#061; 1&#xff0c;\u8fd9\u4e2a int \u5c31\u6ca1\u6709\u7b26\u5408\u5bf9\u9f50\u89c4\u5219\u3002\u6240\u4ee5&#xff0c;\u8981\u6c42\u7c7b\u5bf9\u8c61\u4e5f\u8981\u4ee5 4 \u5b57\u8282\u6807\u51c6\u5bf9\u9f50&#xff0c;\u56e0\u6b64\u7b2c\u4e8c\u5904\u586b\u5145\u4e5f\u662f\u5fc5\u8981\u7684<\/li>\n<h4>\u7a7a\u7c7b\u5bf9\u8c61\u7684\u5185\u5b58\u5927\u5c0f<\/h4>\n<p>\u7a7a\u7c7b\u5bf9\u8c61\u7684\u5185\u5b58\u5360\u7528\u4e0d\u4e3a 0&#xff0c;\u800c\u662f 1&#xff0c;\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Empty<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>Empty<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>\u539f\u56e0\u662fEmpty a \u548c Empty b \u662f\u4e24\u4e2a\u72ec\u7acb\u5bf9\u8c61&#xff0c;\u9700\u8981\u62e5\u6709\u5404\u81ea\u7684\u5bf9\u8c61\u8eab\u4efd&#xff0c;\u56e0\u6b64\u5b9e\u73b0\u4e00\u822c\u9700\u8981\u8ba9\u7a7a\u5bf9\u8c61\u4e5f\u5360\u636e\u81f3\u5c11\u4e00\u5b9a\u5b58\u50a8<\/p>\n<h4>\u6784\u9020 \/ \u8d4b\u503c \/ \u6790\u6784<\/h4>\n<p>\u5b83\u4eec\u5bf9\u5e94\u5bf9\u8c61\u7684\u4e09\u79cd\u72b6\u6001&#xff1a;<\/p>\n<ul>\n<li>\u6784\u9020&#xff1a;\u5bf9\u8c61\u600e\u4e48\u51fa\u751f<\/li>\n<li>\u8d4b\u503c&#xff1a;\u5df2\u7ecf\u5b58\u5728\u7684\u5bf9\u8c61\u600e\u4e48\u66f4\u65b0<\/li>\n<li>\u6790\u6784&#xff1a;\u5bf9\u8c61\u600e\u4e48\u6b7b\u4ea1<\/li>\n<\/ul>\n<p>\u5982\u679c\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7c7b&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u3001\u62f7\u8d1d \/ \u79fb\u52a8\u6784\u9020\u51fd\u6570\u3001\u62f7\u8d1d \/ \u79fb\u52a8\u8d4b\u503c\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570<\/p>\n<p>\u5982\u679c\u7c7b\u663e\u5f0f\u5b9a\u4e49\u4e86\u6784\u9020\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u62f7\u8d1d \/ \u79fb\u52a8\u6784\u9020\u51fd\u6570\u3001\u62f7\u8d1d \/ \u79fb\u52a8\u8d4b\u503c\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570&#xff08;\u6291\u5236\u9ed8\u8ba4\u6784\u9020&#xff09;<\/p>\n<p>\u5982\u679c\u7c7b\u663e\u5f0f\u5b9a\u4e49\u4e86\u6790\u6784\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u3001\u62f7\u8d1d\u6784\u9020\u51fd\u6570\u3001\u62f7\u8d1d\u8d4b\u503c\u51fd\u6570&#xff08;\u6291\u5236\u79fb\u52a8&#xff09;<\/p>\n<p>\u5982\u679c\u7c7b\u663e\u5f0f\u5b9a\u4e49\u4e86\u62f7\u8d1d\u6784\u9020\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u62f7\u8d1d\u8d4b\u503c\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570&#xff08;\u6291\u5236\u79fb\u52a8&#xff09;<\/p>\n<p>\u5982\u679c\u7c7b\u663e\u5f0f\u5b9a\u4e49\u4e86\u79fb\u52a8\u6784\u9020\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u6790\u6784\u51fd\u6570&#xff08;\u6291\u5236\u9ed8\u8ba4\u6784\u9020\u548c\u62f7\u8d1d&#xff09;<\/p>\n<p>\u5982\u679c\u7c7b\u663e\u5f0f\u5b9a\u4e49\u4e86\u62f7\u8d1d\u8d4b\u503c\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u3001\u62f7\u8d1d\u6784\u9020\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570<\/p>\n<p>\u5982\u679c\u7c7b\u663e\u5f0f\u5b9a\u4e49\u4e86\u79fb\u52a8\u8d4b\u503c\u51fd\u6570&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570<\/p>\n<p>\u6ce8\u610f&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u58f0\u660e\u7684\u62f7\u8d1d\u662f\u6d45\u62f7\u8d1d&#xff0c;\u4e5f\u5c31\u662f\u76f4\u63a5\u62f7\u8d1d\u503c\u3002\u5982\u679c\u6210\u5458\u662f\u6307\u9488&#xff0c;\u4e14\u6790\u6784\u6709free \/ delete\u903b\u8f91&#xff0c;\u90a3\u4e48\u6d45\u62f7\u8d1d\u53ef\u80fd\u5bfc\u81f4\u4e24\u4e2a\u5bf9\u8c61\u7684\u6307\u9488\u503c\u76f8\u540c&#xff0c;\u5728\u6790\u6784\u65f6\u4ea7\u751f\u91cd\u590d\u91ca\u653e\u2014\u2014\u62a5\u9519<\/p>\n<p>\u6240\u4ee5\u5728\u6210\u5458\u4e3a\u6307\u9488\u8fd9\u6837\u8d44\u6e90\u7684\u60c5\u51b5\u4e0b&#xff0c;\u5e94\u8be5\u624b\u52a8\u5b9a\u4e49\u62f7\u8d1d\u8d4b\u503c \/ \u6784\u9020&#xff0c;\u5b9e\u73b0\u6df1\u62f7\u8d1d\u903b\u8f91\u2014\u2014\u5373\u62f7\u8d1d\u65f6\u7533\u8bf7\u65b0\u7684\u4e00\u7247\u5185\u5b58\u533a\u57df\u548c\u4e00\u4e2a\u65b0\u7684\u6307\u9488&#xff0c;\u628a\u88ab\u62f7\u8d1d\u5bf9\u8c61\u6307\u5411\u7684\u5185\u5b58\u533a\u57df\u4e2d\u7684\u503c\u62f7\u8d1d\u5230\u65b0\u5185\u5b58\u533a\u57df&#xff0c;\u76f8\u5f53\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u526f\u672c<\/p>\n<h5>\u6784\u9020<\/h5>\n<p>\u521b\u5efa\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528&#xff0c;\u65e0\u8bba\u662f\u6808\u4e0a\u521b\u5efaMyClass c;\u8fd8\u662f\u5806\u4e0a\u521b\u5efaMyClass* c &#061; new MyClass()<\/p>\n<p>\u5206\u4e3a&#xff1a;\u9ed8\u8ba4\u6784\u9020\u3001&#xff08;\u6709\u53c2\u6784\u9020&#xff09;\u3001\u62f7\u8d1d\u6784\u9020\u3001\u79fb\u52a8\u6784\u9020<\/p>\n<ul>\n<li>\u9ed8\u8ba4\u6784\u9020&#xff1a;\u6ca1\u6709\u4efb\u4f55\u53c2\u6570&#xff0c;\u9ed8\u8ba4\u521d\u59cb\u5316\u5bf9\u8c61\u4ee5\u53ca\u6210\u5458&#xff0c;\u5982MyClass c;<\/li>\n<li>\u6709\u53c2\u6784\u9020&#xff1a;\u5e26\u6709\u53c2\u6570&#xff0c;\u6839\u636e\u4f20\u5165\u53c2\u6570\u521d\u59cb\u5316\u5bf9\u8c61\u4ee5\u53ca\u6210\u5458&#xff0c;\u5982MyClass c(a,b);<\/li>\n<li>\u62f7\u8d1d\u6784\u9020&#xff1a;\u4f20\u5165\u540c\u7c7b\u578b\u7684\u5de6\u503c\u5bf9\u8c61&#xff0c;\u5c06\u5b83\u7684\u6210\u5458\u62f7\u8d1d\u5230\u81ea\u8eab\u6210\u5458&#xff0c;\u5982MyClass c(c2);<\/li>\n<li>\u79fb\u52a8\u6784\u9020&#xff1a;\u4f20\u5165\u540c\u7c7b\u578b\u7684\u53f3\u503c\u5bf9\u8c61&#xff0c;\u5c06\u5b83\u7684\u6210\u5458\u8f6c\u79fb \/ \u62f7\u8d1d\u5230\u81ea\u8eab\u6210\u5458&#xff0c;\u5982MyClass c(std::move(c2));<\/li>\n<\/ul>\n<h5>\u8d4b\u503c<\/h5>\n<p>\u5c06\u5bf9\u8c61\u8d4b\u503c\u7ed9\u5df2\u5b58\u5728\u5bf9\u8c61\u65f6\u8c03\u7528&#xff0c;\u5206\u4e3a&#xff1a;\u62f7\u8d1d\u8d4b\u503c\u3001\u79fb\u52a8\u8d4b\u503c<\/p>\n<ul>\n<li>\u62f7\u8d1d\u8d4b\u503c&#xff1a;\u5c06\u4f20\u5165\u7684\u540c\u7c7b\u578b\u5de6\u503c\u5bf9\u8c61\u7684\u6210\u5458\u62f7\u8d1d\u5230\u81ea\u8eab\u6210\u5458&#xff0c;\u5982c &#061; c2;<\/li>\n<li>\u79fb\u52a8\u8d4b\u503c&#xff1a;\u5c06\u4f20\u5165\u7684\u540c\u7c7b\u578b\u53f3\u503c\u5bf9\u8c61\u7684\u6210\u5458\u62f7\u8d1d\u5230\u81ea\u8eab\u6210\u5458&#xff0c;\u5982c &#061; std::move(c2);<\/li>\n<\/ul>\n<h5>\u6790\u6784<\/h5>\n<p>\u5bf9\u8c61\u751f\u547d\u5468\u671f\u7ed3\u675f\u65f6\u81ea\u52a8\u8c03\u7528&#xff0c;\u4e5f\u53ef\u4e3b\u52a8\u8c03\u7528\u4ee5\u9500\u6bc1\u5bf9\u8c61&#xff0c;\u5982c.~MyClass();<\/p>\n<p>\u5728\u51fd\u6570\u5185\u90e8\u8fdb\u884c\u8d44\u6e90\u91ca\u653e&#xff0c;\u6bd4\u5982\u5f53\u6210\u5458\u53d8\u91cf\u4e3a\u6709\u6548\u7684\u6307\u9488\u65f6&#xff0c;\u6790\u6784\u4e2d\u5e94free \/ delete<\/p>\n<h4>\u79fb\u52a8\u8bed\u4e49<\/h4>\n<p>\u79fb\u52a8\u8bed\u4e49\u7684\u610f\u601d\u662f\u8ba9\u65b0\u5bf9\u8c61\u5c3d\u91cf\u63a5\u7ba1\u65e7\u5bf9\u8c61\u5185\u90e8\u53ef\u8f6c\u79fb\u7684\u8d44\u6e90&#xff0c;\u907f\u514d\u6602\u8d35\u62f7\u8d1d<\/p>\n<p>\u4ec0\u4e48\u662f\u53ef\u8f6c\u79fb\u8d44\u6e90&#xff1f;<\/p>\n<p>\u6bd4\u5982\u5bf9\u8c61 A \u6709\u6307\u9488\u6210\u5458&#xff0c;\u6307\u5411\u4e00\u5927\u7247\u5185\u5b58\u533a\u57df\u3002\u4e0d\u5e0c\u671b\u62f7\u8d1d\u8fd9\u7247\u5185\u5b58\u4e2d\u7684\u6570\u636e&#xff0c;\u800c\u662f\u901a\u8fc7\u62f7\u8d1d\u6307\u9488\u503c\u7684\u65b9\u5f0f\u6765\u8f6c\u79fb\u8d44\u6e90<\/p>\n<p>\u8fd9\u6837\u5c31\u4e0e\u62f7\u8d1d\u4e2d\u7684\u6df1\u62f7\u8d1d\u539f\u5219\u76f8\u53cd\u4e86\u3002\u53ef\u4ee5\u7406\u89e3\u4e3a\u62f7\u8d1d\u4f9d\u8d56\u6df1\u62f7\u8d1d&#xff0c;\u800c\u79fb\u52a8\u4f9d\u8d56\u6d45\u62f7\u8d1d<\/p>\n<p>\u539f\u56e0\u662f&#xff0c;\u79fb\u52a8\u53d1\u751f\u65f6&#xff0c;\u88ab\u79fb\u52a8\u7684\u5bf9\u8c61\u88ab\u8ba4\u4e3a\u662f\u5373\u5c06\u5f03\u7528\u7684&#xff0c;\u6240\u4ee5\u4e0d\u5e94\u518d\u590d\u5236\u4e00\u4efd\u5b83\u7684\u526f\u672c\u51fa\u6765&#xff0c;\u800c\u662f\u76f4\u63a5\u62ff\u8d70\u5b83\u7684\u8d44\u6e90<\/p>\n<h5>\u79fb\u52a8\u8bed\u4e49\u7684\u57fa\u7840&#xff1a;\u53f3\u503c<\/h5>\n<p>\u5f53\u5bf9\u4e00\u4e2a\u5bf9\u8c61\u8fdb\u884c\u6784\u9020\u6216\u8d4b\u503c\u65f6&#xff0c;\u5982\u679c\u4f20\u5165\u7684\u53c2\u6570\u662f\u53f3\u503c\u5f15\u7528&#xff0c;\u90a3\u4e48\u5c31\u4f1a\u89e6\u53d1\u79fb\u52a8\u6784\u9020 \/ \u8d4b\u503c<\/p>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p>Class A<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token operator\">~<\/span><span class=\"token function\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">A<\/span><span class=\"token punctuation\">(<\/span>A<span class=\"token operator\">&amp;&amp;<\/span> other<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> other<span class=\"token punctuation\">.<\/span>p<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u6307\u9488\u503c\u6d45\u62f7\u8d1d<\/span><br \/>\nother<span class=\"token punctuation\">.<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5c06\u65e7\u5bf9\u8c61\u7684\u6307\u9488\u8d44\u6e90\u6807\u8bb0\u4e3a\u65e0\u6548<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> p<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>A a2<span class=\"token punctuation\">;<\/span><br \/>\nA a1 <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>a2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u58f0\u660e\u4e3a\u53f3\u503c&#xff0c;\u89e6\u53d1\u79fb\u52a8\u6784\u9020 <\/span><\/p>\n<p>std::move\u6ca1\u6709\u79fb\u52a8\u8d44\u6e90&#xff0c;\u5b83\u505a\u7684\u662f\u8fd4\u56de\u4e00\u4e2a\u5bf9\u4f20\u5165\u5bf9\u8c61\u7684\u53f3\u503c\u5f15\u7528&#xff0c;\u53ef\u4ee5\u7406\u89e3\u4e3astatic_cast&lt;A&amp;&amp;&gt;(a);&#xff0c;\u524d\u9762\u6709\u7ec6\u8bb2<\/p>\n<p>\u7136\u540e a1 \u77e5\u9053\u4e86\u4f20\u5165\u7684 a2 \u662f\u53f3\u503c&#xff0c;\u89e6\u53d1\u4e86\u79fb\u52a8\u6784\u9020\u51fd\u6570&#xff0c;\u5c06\u8d44\u6e90\u6240\u6709\u6743\u4ece a2 \u8f6c\u79fb\u5230\u81ea\u8eab<\/p>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u548c\u6d45\u62f7\u8d1d\u7684\u533a\u522b\u662f&#xff1a;\u6d45\u62f7\u8d1d\u53ea\u505a\u4e86\u503c\u62f7\u8d1d&#xff0c;\u4f46\u79fb\u52a8\u8bed\u4e49\u8fd8\u7f6e\u7a7a\u4e86\u65e7\u5bf9\u8c61\u7684\u8d44\u6e90&#xff0c;\u4fdd\u8bc1\u8d44\u6e90\u53ea\u6709\u4e00\u4efd<\/p>\n<h5>\u79fb\u52a8\u8bed\u4e49\u9000\u5316<\/h5>\n<p>\u5f53\u4f20\u5165\u79fb\u52a8\u6784\u9020 \/ \u8d4b\u503c\u51fd\u6570\u7684\u53c2\u6570\u662fint\u3001char\u3001long\u8fd9\u79cd\u57fa\u672c\u7c7b\u578b\u65f6&#xff0c;\u79fb\u52a8\u4f1a\u9000\u5316\u4e3a\u62f7\u8d1d<\/p>\n<p>\u56e0\u4e3a\u8fd9\u79cd\u7c7b\u578b\u7684\u8d44\u6e90\u5c31\u662f\u5b83\u7684\u503c&#xff0c;\u800c\u4e0d\u50cf\u6307\u9488\u53d8\u91cf\u5b83\u7684\u6307\u9488\u503c\u548c\u8d44\u6e90\u4e0d\u662f\u4e00\u4f53\u7684&#xff0c;<\/p>\n<h4>\u7ee7\u627f<\/h4>\n<p>\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7684\u4e00\u5927\u7279\u6027&#xff0c;\u5c31\u662f\u8ba9\u4e00\u4e2a\u65b0\u7c7b\u5728\u5df2\u6709\u7c7b\u7684\u57fa\u7840\u4e0a\u7ee7\u7eed\u6269\u5c55&#xff0c;\u4f7f\u6d3e\u751f\u7c7b\u81ea\u52a8\u62e5\u6709\u57fa\u7c7b\u7684\u4e00\u90e8\u5206\u6570\u636e\u548c\u884c\u4e3a<\/p>\n<p>\u57fa\u672c\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Base<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Derived<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Base<\/span><\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token comment\">\/\/\u8fd8\u7ee7\u627f\u4e86\u7236\u7c7b\u7684 x \u548c Func()&#xff0c;\u4e14\u7ee7\u627f\u4e8e\u7236\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u4f1a\u5b58\u653e\u5728\u5b50\u7c7b\u5bf9\u8c61\u7684\u524d\u534a\u90e8\u5206&#xff0c;\u540e\u534a\u90e8\u5206\u624d\u662f\u5b50\u7c7b\u6210\u5458&#xff0c;\u4ee5\u652f\u6301\u7c7b\u578b\u8f6c\u6362<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u53ef\u4ee5\u7406\u89e3\u4e3a&#xff1a;<\/span><br \/>\nDerived d<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502 Base \u5b50\u5bf9\u8c61      \u2502<br \/>\n\u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502<br \/>\n\u2502 \u2502 <span class=\"token keyword\">int<\/span> a       \u2502 \u2502<br \/>\n\u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 <span class=\"token keyword\">int<\/span> b           \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<h5>\u6743\u9650\u7ee7\u627f<\/h5>\n<table>\n<tr>public \u5bf9\u8c61\u5728\u5b50\u7c7b\u4e2dprotected \u5bf9\u8c61\u5728\u5b50\u7c7b\u4e2dprivate \u5bf9\u8c61\u5728\u5b50\u7c7b\u4e2d\u5907\u6ce8<\/tr>\n<tbody>\n<tr>\n<td>public \u7ee7\u627f<\/td>\n<td align=\"center\">public<\/td>\n<td align=\"center\">protected<\/td>\n<td align=\"center\">\u4e0d\u53ef\u8bbf\u95ee<\/td>\n<td align=\"center\">\u6743\u9650\u4e0d\u53d8<\/td>\n<\/tr>\n<tr>\n<td>protected \u7ee7\u627f<\/td>\n<td align=\"center\">protected<\/td>\n<td align=\"center\">protected<\/td>\n<td align=\"center\">\u4e0d\u53ef\u8bbf\u95ee<\/td>\n<td align=\"center\">\u516c\u5f00\u53d8\u4fdd\u62a4<\/td>\n<\/tr>\n<tr>\n<td>private \u7ee7\u627f<\/td>\n<td align=\"center\">private<\/td>\n<td align=\"center\">private<\/td>\n<td align=\"center\">\u4e0d\u53ef\u8bbf\u95ee<\/td>\n<td align=\"center\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u603b\u7ed3&#xff1a;\u7236\u7c7b\u79c1\u6709\u6210\u5458\u5728\u5b50\u7c7b\u4e2d\u4e0d\u53ef\u8bbf\u95ee&#xff0c;\u4fdd\u62a4\u6743\u9650\u4f18\u5148\u7ea7 &gt; \u516c\u5f00\u4f18\u5148\u7ea7<\/p>\n<p>class \u9ed8\u8ba4\u6743\u9650\u662f private&#xff0c;\u9ed8\u8ba4\u7ee7\u627f\u6743\u9650\u662f private&#xff1b;struct \u9ed8\u8ba4\u6743\u9650\u662f public&#xff0c;\u9ed8\u8ba4\u7ee7\u627f\u6743\u9650\u662f public<\/p>\n<h5>\u9690\u85cf\u548c\u91cd\u5199<\/h5>\n<p>\u9690\u85cf&#xff1a;\u5b50\u7c7b\u5b9a\u4e49\u4e86\u4e0e\u7236\u7c7b\u51fd\u6570\u91cd\u540d\u4f46\u53c2\u6570\u4e0d\u540c\u7684\u51fd\u6570&#xff0c;\u7236\u7c7b\u51fd\u6570\u88ab\u9690\u85cf<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Base<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Derived<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Base<\/span><\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u91cd\u5199&#xff1a;\u5b50\u7c7b\u7ee7\u627f\u540e\u5b9a\u4e49\u4e86\u4e0e\u7236\u7c7b\u865a\u51fd\u6570\u91cd\u540d\u4e14\u53c2\u6570\u76f8\u540c\u7684\u51fd\u6570&#xff0c;\u540e\u9762\u865a\u51fd\u6570\u4e2d\u7ec6\u8bb2<\/p>\n<h5>\u6784\u9020\u4e0e\u6790\u6784\u987a\u5e8f<\/h5>\n<p>\u521b\u5efa\u5b50\u7c7b\u5bf9\u8c61\u65f6&#xff1a;<\/p>\n<p>\u5148\u6784\u9020\u7236\u7c7b&#xff0c;\u518d\u6784\u9020\u5b50\u7c7b<\/p>\n<p>\u5148\u5206\u914d\u5b50\u7c7b\u5bf9\u8c61\u5927\u5c0f\u7684\u5185\u5b58\u3002\u5728\u8fd9\u7247\u5185\u5b58\u7684\u524d\u534a\u90e8\u5206\u4f7f\u7528\u7236\u7c7b\u5bf9\u8c61\u5927\u5c0f\u7684\u7a7a\u95f4&#xff0c;\u5148\u6784\u9020\u7236\u7c7b\u6210\u5458&#xff0c;\u7136\u540e\u6267\u884c\u7236\u7c7b\u6784\u9020\u51fd\u6570&#xff1b;\u518d\u5728\u7236\u7c7b\u6210\u5458\u540e\u6784\u9020\u5b50\u7c7b\u6210\u5458&#xff0c;\u6267\u884c\u5b50\u7c7b\u7684\u6784\u9020\u51fd\u6570<\/p>\n<p>\u6240\u4ee5Base* d &#061; new Derived();\u662f\u5408\u6cd5\u7684&#xff0c;\u56e0\u4e3a\u6765\u81ea\u7236\u7c7b\u7684\u6210\u5458\u5c31\u662f\u653e\u5728\u5bf9\u8c61\u9760\u524d\u7684\u90a3\u90e8\u5206\u5185\u5b58&#xff0c;\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee&#xff0c;\u8fd9\u53eb\u5411\u4e0a\u8f6c\u578b<\/p>\n<p>\u800cDerived* b &#061; new Base();\u901a\u5e38\u4e0d\u884c&#xff0c;\u56e0\u4e3a new base \u51fa\u6765\u7684\u7f3a\u5c11\u540e\u534a\u7684\u5b50\u7c7b\u6210\u5458\u90e8\u5206<\/p>\n<p>\u9500\u6bc1\u5b50\u7c7b\u5bf9\u8c61\u65f6&#xff1a;<\/p>\n<p>\u5148\u8c03\u7528\u5b50\u7c7b\u6790\u6784\u51fd\u6570&#xff0c;\u5b50\u7c7b\u6790\u6784\u4e2d\u9690\u5f0f\u8c03\u7528\u7236\u7c7b\u6790\u6784\u51fd\u6570&#xff0c;\u5bf9\u8c61\u5185\u5b58\u662f\u5426\u91ca\u653e\u53d6\u51b3\u4e8e\u521b\u5efa\u65b9\u5f0f<\/p>\n<h4>\u591a\u6001<\/h4>\n<p>\u6838\u5fc3\u610f\u4e49&#xff1a;\u540c\u4e00\u4e2a\u63a5\u53e3&#xff0c;\u9762\u5bf9\u4e0d\u540c\u5b9e\u9645\u5bf9\u8c61\u65f6&#xff0c;\u8868\u73b0\u51fa\u4e0d\u540c\u7684\u884c\u4e3a<\/p>\n<h5>\u865a\u51fd\u6570<\/h5>\n<p>\u865a\u51fd\u6570\u5c31\u662f\u5728\u7c7b\u4e2d\u88ab virtual \u4fee\u9970\u7684\u6210\u5458\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Base<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">virtual<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Base\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b58\u5728\u865a\u51fd\u6570\u7684\u7c7b&#xff0c;\u5728\u7f16\u8bd1\u65f6\u4f1a\u751f\u6210\u4e00\u5f20\u865a\u51fd\u6570\u8868&#xff0c;\u91cc\u9762\u5b58\u653e\u7740\u8fd9\u4e2a\u7c7b\u7684\u6240\u6709\u865a\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488&#xff0c;\u6307\u9488\u6307\u5411\u865a\u51fd\u6570\u5b9e\u9645\u5b9e\u73b0\u4ee3\u7801<\/p>\n<p>\u865a\u51fd\u6570\u8868\u5b58\u653e\u5728 .rodata&#xff0c;\u865a\u51fd\u6570\u4ee3\u7801\u5728 .text<\/p>\n<p>\u521b\u5efa\u7c7b\u5bf9\u8c61\u5b9e\u4f8b\u65f6&#xff0c;\u7c7b\u5bf9\u8c61\u4f1a\u9690\u5f0f\u589e\u52a0\u4e00\u4e2a\u865a\u8868\u6307\u9488 vptr&#xff08;8 \u5b57\u8282&#xff09;&#xff0c;\u6307\u5411\u7c7b\u7684\u865a\u51fd\u6570\u8868<\/p>\n<p>vptr \u4e00\u822c\u5728\u5bf9\u8c61\u5185\u5b58\u7684\u8d77\u59cb\u4f4d\u7f6e\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;\u8bbf\u95ee\u5bf9\u8c61\u6210\u5458\u5c31\u8981\u591a 8 \u5b57\u8282\u504f\u79fb&#xff0c;\u4f46\u662f\u7f16\u8bd1\u5668\u4f1a\u89e3\u51b3<\/p>\n<p>\u7ee7\u627f\u65f6&#xff0c;\u5982\u679c\u5b50\u7c7b\u91cd\u5199\u4e86\u7236\u7c7b\u7684\u865a\u51fd\u6570&#xff0c;\u4f1a\u7528\u5b50\u7c7b\u865a\u51fd\u6570\u6307\u9488\u8986\u76d6\u5b50\u7c7b\u865a\u51fd\u6570\u8868\u4e2d\u7684\u8be5\u865a\u51fd\u6570<\/p>\n<h5>\u8fd0\u884c\u65f6\u591a\u6001<\/h5>\n<p>\u540c\u4e00\u5957\u7ee7\u627f\u4f53\u7cfb\u4e2d&#xff0c;\u901a\u8fc7\u57fa\u7c7b\u6307\u9488\/\u5f15\u7528\u64cd\u4f5c\u5bf9\u8c61\u65f6&#xff0c;\u865a\u51fd\u6570\u6700\u7ec8\u8c03\u7528\u54ea\u4e2a\u7248\u672c&#xff0c;\u7531\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\u5728\u8fd0\u884c\u65f6\u51b3\u5b9a&#xff0c;\u5982&#xff1a;<\/p>\n<p>Derived d<span class=\"token punctuation\">;<\/span><br \/>\nBase<span class=\"token operator\">*<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>d<span class=\"token punctuation\">;<\/span><br \/>\np<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5b9e\u9645\u8c03\u7528\u7684\u662f\u5b50\u7c7b\u7684 Func()&#xff0c;\u8fd9\u5c31\u662f\u8fd0\u884c\u65f6\u591a\u6001<\/span><\/p>\n<p>\u5e95\u5c42\u5b9e\u73b0\u662f&#xff1a;\u8c03\u7528\u865a\u51fd\u6570\u63a5\u53e3\u65f6&#xff0c;\u6839\u636e\u5bf9\u8c61\u4e2d\u7684 vptr \u627e\u5230\u865a\u51fd\u6570\u8868&#xff0c;\u7136\u540e\u627e\u5230\u5bf9\u5e94\u865a\u51fd\u6570\u6307\u9488&#xff0c;\u7136\u540e\u6267\u884c\u865a\u51fd\u6570\u903b\u8f91<\/p>\n<p>\u7531\u4e8e\u8fd0\u884c\u65f6\u624d\u52a8\u6001\u7ed1\u5b9a\u5b9e\u9645\u5bf9\u8c61&#xff0c;\u6240\u4ee5\u662f\u8fd0\u884c\u65f6\u591a\u6001<\/p>\n<p>\u591a\u6001\u7684\u6838\u5fc3\u8bbe\u8ba1\u601d\u60f3&#xff1a;\u57fa\u7c7b\u5b9a\u4e49\u7edf\u4e00\u63a5\u53e3&#xff0c;\u6d3e\u751f\u7c7b\u63d0\u4f9b\u4e0d\u540c\u5b9e\u73b0<\/p>\n<h5>\u7eaf\u865a\u51fd\u6570\u4e0e\u62bd\u8c61\u7c7b<\/h5>\n<p>\u5982\u679c\u57fa\u7c7b\u53ea\u662f\u60f3\u89c4\u5b9a\u63a5\u53e3&#xff0c;\u4e0d\u63d0\u4f9b\u4efb\u4f55\u5b9e\u73b0&#xff0c;\u53ef\u4ee5\u58f0\u660e\u4e3a\u7eaf\u865a\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token comment\">\/\/\u53ea\u8981\u6709\u4e00\u4e2a\u6210\u5458\u51fd\u6570\u662f\u7eaf\u865a\u51fd\u6570&#xff0c;\u8be5\u7c7b\u53d8\u6210\u62bd\u8c61\u7c7b&#xff0c;\u65e0\u6cd5\u5b9e\u4f8b\u5316&#xff1b;\u5982\u679c\u5b50\u7c7b\u6ca1\u6709 override \u8fd9\u4e2a\u7eaf\u865a\u51fd\u6570&#xff0c;\u4e5f\u4f1a\u53d8\u6210\u62bd\u8c61\u7c7b<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">virtual<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">Speak<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u865a\u6790\u6784<\/h5>\n<p>\u7ee7\u627f\u591a\u6001\u4f53\u7cfb\u4e2d\u7684\u6790\u6784\u51fd\u6570\u901a\u5e38\u58f0\u660e\u4e3a virtual<\/p>\n<p>\u76ee\u7684\u662f&#xff1a;\u5bf9\u8c61\u6790\u6784\u65f6\u591a\u6001\u8c03\u7528\u5230\u5b9e\u9645\u5b50\u7c7b\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u5728\u81ea\u7136\u987a\u7740\u9006\u5411\u6790\u6784\u94fe\u5411\u4e0a\u6790\u6784&#xff0c;\u4fdd\u8bc1\u8d44\u6e90\u6b63\u786e\u91ca\u653e<\/p>\n<h5>\u591a\u7ee7\u627f<\/h5>\n<p>\u5f53\u5b50\u7c7b\u7ee7\u627f\u4e86\u591a\u4e2a\u542b\u6709\u865a\u51fd\u6570\u7684\u7236\u7c7b\u65f6&#xff0c;\u5b50\u7c7b\u5bf9\u8c61\u5c31\u4f1a\u62e5\u6709\u591a\u4e2a vptr&#xff0c;\u5e03\u5c40\u53ef\u4ee5\u7406\u89e3\u4e3a&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/\u65e0\u865a\u51fd\u6570<\/span><br \/>\nC object<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502 A subobject  \u2502<br \/>\n\u2502   <span class=\"token keyword\">int<\/span> a      \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 B subobject  \u2502<br \/>\n\u2502   <span class=\"token keyword\">int<\/span> b      \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 <span class=\"token keyword\">int<\/span> c        \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<p><span class=\"token comment\">\/\/\u6709\u865a\u51fd\u6570<\/span><br \/>\nC object<br \/>\noffset <span class=\"token number\">0<\/span><br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502 A<span class=\"token double-colon punctuation\">::<\/span>vptr          \u2502 <span class=\"token number\">8<\/span><br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 A<span class=\"token double-colon punctuation\">::<\/span>a             \u2502 <span class=\"token number\">4<\/span><br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 padding          \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 B<span class=\"token double-colon punctuation\">::<\/span>vptr          \u2502 <span class=\"token number\">8<\/span><br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 B<span class=\"token double-colon punctuation\">::<\/span>b             \u2502 <span class=\"token number\">4<\/span><br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 padding          \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 C<span class=\"token double-colon punctuation\">::<\/span>c             \u2502 <span class=\"token number\">4<\/span><br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502 padding          \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<p>\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;C* C &#061; new C();\u3001B* C &#061; new C();\u3001A* C &#061; new C();\u90fd\u80fd\u6b63\u786e\u8bbf\u95ee\u5176\u5bf9\u5e94\u7684\u90e8\u5206&#xff0c;\u4e0d\u4f1a\u9519\u8bef<\/p>\n<p>\u591a\u7ee7\u627f\u4f1a\u4ea7\u751f\u4e00\u79cd\u53eb\u201c\u83f1\u5f62\u7ee7\u627f\u201d\u7684\u60c5\u51b5&#xff0c;\u89e3\u51b3\u65b9\u6cd5\u662f\u865a\u7ee7\u627f&#xff0c;\u8fd9\u91cc\u4e0d\u5c55\u5f00\u8bb2<\/p>\n<h5>\u591a\u6001\u7ea6\u675f<\/h5>\n<p>final \u53ef\u4ee5\u5e2e\u52a9\u8868\u8fbe\u591a\u6001\u7ea6\u675f<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Derived<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token operator\">:<\/span> <span class=\"token keyword\">public<\/span> Base<span class=\"token comment\">\/\/\u8868\u793a Derived \u4e0d\u5141\u8bb8\u7ee7\u7eed\u7ee7\u627f<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">virtual<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">Func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">final<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u58f0\u660e\u540e\u9762\u7684\u6d3e\u751f\u7c7b\u4e0d\u80fd\u518d override<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u4e24\u79cd\u5199\u6cd5\u90fd\u53ef\u4ee5\u7ea6\u675f\u591a\u6001\u6cdb\u6ee5\u6216\u4e0d\u786e\u5b9a&#xff0c;\u5e2e\u52a9\u7f16\u8bd1\u5668\u66f4\u5bb9\u6613\u786e\u5b9a\u6700\u7ec8\u8c03\u7528\u76ee\u6807<\/span><\/p>\n<h5>\u9759\u6001\u591a\u6001<\/h5>\n<p>\u8c03\u7528\u54ea\u4e2a\u51fd\u6570&#xff0c;\u5728\u7f16\u8bd1\u671f\u5c31\u5df2\u7ecf\u786e\u5b9a<\/p>\n<p>C&#043;&#043; \u91cc\u5e38\u89c1\u7684\u9759\u6001\u591a\u6001\u4e3b\u8981\u6709\u4e09\u79cd&#xff0c;\u8fd9\u91cc\u4e0d\u5c55\u5f00\u8bb2\u4e86&#xff1a;<\/p>\n<ul>\n<li>\u51fd\u6570\u91cd\u8f7d&#xff1a;\u540c\u540d\u4e0d\u540c\u53c2\u7684\u51fd\u6570<\/li>\n<li>\u6a21\u677f<\/li>\n<li>CRTP&#xff08;\u66f4\u5178\u578b\u7684\u201c\u9762\u5411\u5bf9\u8c61\u5f0f\u9759\u6001\u591a\u6001\u201d&#xff09;<\/li>\n<\/ul>\n<p>\u672c\u7bc7\u6536\u5b98\u3002\u3002\u3002\u540e\u9762\u4f1a\u8bf4\u8bf4\u667a\u80fd\u6307\u9488<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u4eba\u5fd7\u5728\u6301\u7eed\u66f4\u65b0\u8ba1\u7b97\u673a\u7cfb\u7edf\u3001\u8ba1\u7b97\u673a\u7f51\u7edc\u3001C\u8bed\u8a00\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\u7684\u7cfb\u5217\u5408\u96c6&#xff0c;\u4ee5\u6613\u61c2\u3001\u5168\u9762\u7684\u65b9\u5f0f\u8bb2\u89e3\u5e95\u5c42\u77e5\u8bc6\u3002\u5bf9\u4e8e\u6b63\u5728\u51c6\u5907\u9762\u8bd5\u516b\u80a1\u7684\u670b\u53cb\u6765\u8bf4&#xff0c;\u672c\u7cfb\u5217\u6db5\u76d6\u4e86\u672c\u4eba\u9762\u8bd5\u4e2d\u9047\u5230\u7684\u6240\u6709\u8003\u70b9\u4ee5\u53ca\u8bb8\u591a\u76f8\u5173\u62d3\u5c55\u77e5\u8bc6&#xff0c;\u8bfb\u5b8c\u540e\u80fd\u5e2e\u52a9\u4f60\u4ece\u5bb9\u9762\u5bf9\u5927\u90e8\u5206\u9762\u8bd5\u62f7\u6253&#xff1b;\u5bf9\u4e8e\u60f3\u8981\u6df1\u5165\u5b66\u4e60\u8ba1\u7b97\u673a\u77e5\u8bc6\u7684\u670b\u53cb\u6765\u8bf4&#xff0c;\u672c\u7cfb\u5217\u6bd4\u8f83\u7cfb\u7edf\u5730\u4ecb\u7ecd\u4e86\u64cd\u4f5c\u7cfb\u7edf\u548c\u7f51\u7edc\u7b49\u91cd\u70b9\u5185\u5bb9&#xff0c;\u4e5f\u4e3e\u4e86\u4e0d\u5c11\u4f8b\u5b50&#xff0c;\u5927\u5927\u6709\u52a9\u4e8e\u4f60\u4ece\u5e95\u5c42\u7684\u89c6\u89d2\u53bb\u7406\u89e3\u8ba1\u7b97\u673a\u7cfb\u7edf\u3002<br \/>\n\u5148\u8bf4\u660e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,190],"topic":[],"class_list":["post-97689","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6df1\u5165\u6d45\u51fa\u7406\u89e3\u8ba1\u7b97\u673a\u6838\u5fc3\u77e5\u8bc6\u7cfb\u5217\u3010C++\u8bed\u8a00\u7279\u6027\u5408\u96c6-\u8bed\u6cd5\u57fa\u7840\u4e0e\u62d3\u5c55\u7bc7\u3011 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/97689.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" 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content=\"\u672c\u4eba\u5fd7\u5728\u6301\u7eed\u66f4\u65b0\u8ba1\u7b97\u673a\u7cfb\u7edf\u3001\u8ba1\u7b97\u673a\u7f51\u7edc\u3001C\u8bed\u8a00\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\u7684\u7cfb\u5217\u5408\u96c6&#xff0c;\u4ee5\u6613\u61c2\u3001\u5168\u9762\u7684\u65b9\u5f0f\u8bb2\u89e3\u5e95\u5c42\u77e5\u8bc6\u3002\u5bf9\u4e8e\u6b63\u5728\u51c6\u5907\u9762\u8bd5\u516b\u80a1\u7684\u670b\u53cb\u6765\u8bf4&#xff0c;\u672c\u7cfb\u5217\u6db5\u76d6\u4e86\u672c\u4eba\u9762\u8bd5\u4e2d\u9047\u5230\u7684\u6240\u6709\u8003\u70b9\u4ee5\u53ca\u8bb8\u591a\u76f8\u5173\u62d3\u5c55\u77e5\u8bc6&#xff0c;\u8bfb\u5b8c\u540e\u80fd\u5e2e\u52a9\u4f60\u4ece\u5bb9\u9762\u5bf9\u5927\u90e8\u5206\u9762\u8bd5\u62f7\u6253&#xff1b;\u5bf9\u4e8e\u60f3\u8981\u6df1\u5165\u5b66\u4e60\u8ba1\u7b97\u673a\u77e5\u8bc6\u7684\u670b\u53cb\u6765\u8bf4&#xff0c;\u672c\u7cfb\u5217\u6bd4\u8f83\u7cfb\u7edf\u5730\u4ecb\u7ecd\u4e86\u64cd\u4f5c\u7cfb\u7edf\u548c\u7f51\u7edc\u7b49\u91cd\u70b9\u5185\u5bb9&#xff0c;\u4e5f\u4e3e\u4e86\u4e0d\u5c11\u4f8b\u5b50&#xff0c;\u5927\u5927\u6709\u52a9\u4e8e\u4f60\u4ece\u5e95\u5c42\u7684\u89c6\u89d2\u53bb\u7406\u89e3\u8ba1\u7b97\u673a\u7cfb\u7edf\u3002 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