{"id":58017,"date":"2025-08-16T00:00:09","date_gmt":"2025-08-15T16:00:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58017.html"},"modified":"2025-08-16T00:00:09","modified_gmt":"2025-08-15T16:00:09","slug":"%e7%ac%ac%e4%ba%8c%e5%8d%81%e5%9b%9b%e5%a4%a9%ef%bc%9a%e8%99%9a%e5%87%bd%e6%95%b0%e4%b8%8e%e7%ba%af%e8%99%9a%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58017.html","title":{"rendered":"\u7b2c\u4e8c\u5341\u56db\u5929\uff1a\u865a\u51fd\u6570\u4e0e\u7eaf\u865a\u51fd\u6570"},"content":{"rendered":"<li>\u865a\u51fd\u6570&#xff08;Virtual Function&#xff09;\n<ul>\n<li>\u5b9a\u4e49&#xff1a;\u5728\u57fa\u7c7b\u4e2d\u4f7f\u7528 virtual \u5173\u952e\u5b57\u58f0\u660e\u7684\u6210\u5458\u51fd\u6570&#xff0c;\u5141\u8bb8\u5728\u6d3e\u751f\u7c7b\u4e2d\u88ab\u91cd\u65b0\u5b9a\u4e49&#xff08;\u8986\u76d6&#xff0c;override&#xff09;\u3002\u5176\u76ee\u7684\u662f\u5b9e\u73b0\u591a\u6001\u6027&#xff0c;\u5373\u901a\u8fc7\u57fa\u7c7b\u6307\u9488\u6216\u5f15\u7528\u8c03\u7528\u51fd\u6570\u65f6&#xff0c;\u6839\u636e\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\u6765\u51b3\u5b9a\u8c03\u7528\u54ea\u4e2a\u7c7b\u7684\u51fd\u6570\u7248\u672c\u3002<\/li>\n<\/ul>\n<\/li>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/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\">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 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;Animal speaks&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><\/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\">void<\/span> <span class=\"token function\">speak<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <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;Dog barks&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Cat<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><\/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\">void<\/span> <span class=\"token function\">speak<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <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;Cat meows&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Animal<span class=\"token operator\">*<\/span> animal1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Animal<span class=\"token operator\">*<\/span> animal2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    animal1<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">speak<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    animal2<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">speak<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">delete<\/span> animal1<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">delete<\/span> animal2<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d&#xff0c;Animal \u7c7b\u4e2d\u7684 speak \u51fd\u6570\u88ab\u58f0\u660e\u4e3a\u865a\u51fd\u6570\u3002Dog \u548c Cat \u7c7b\u4ece Animal \u7c7b\u6d3e\u751f&#xff0c;\u5e76\u8986\u76d6\u4e86 speak \u51fd\u6570\u3002\u5728 main \u51fd\u6570\u4e2d&#xff0c;\u901a\u8fc7\u57fa\u7c7b\u6307\u9488\u8c03\u7528 speak \u51fd\u6570\u65f6&#xff0c;\u5b9e\u9645\u8c03\u7528\u7684\u662f\u5bf9\u8c61\u6240\u5bf9\u5e94\u7684\u6d3e\u751f\u7c7b\u4e2d\u7684\u51fd\u6570\u7248\u672c&#xff0c;\u4ece\u800c\u5b9e\u73b0\u4e86\u591a\u6001\u6027\u3002<\/li>\n<\/ul>\n<li>\u7eaf\u865a\u51fd\u6570&#xff08;Pure Virtual Function&#xff09;\n<ul>\n<li>\u5b9a\u4e49&#xff1a;\u5728\u57fa\u7c7b\u4e2d\u58f0\u660e\u7684\u6ca1\u6709\u51fd\u6570\u4f53&#xff0c;\u5e76\u4e14\u521d\u59cb\u5316\u4e3a 0 \u7684\u865a\u51fd\u6570\u3002\u5305\u542b\u7eaf\u865a\u51fd\u6570\u7684\u7c7b\u79f0\u4e3a\u62bd\u8c61\u7c7b&#xff0c;\u62bd\u8c61\u7c7b\u4e0d\u80fd\u5b9e\u4f8b\u5316\u5bf9\u8c61&#xff0c;\u53ea\u80fd\u4f5c\u4e3a\u57fa\u7c7b\u88ab\u6d3e\u751f\u7c7b\u7ee7\u627f\u3002\u6d3e\u751f\u7c7b\u5fc5\u987b\u5b9e\u73b0\u7eaf\u865a\u51fd\u6570&#xff0c;\u5426\u5219\u6d3e\u751f\u7c7b\u4e5f\u5c06\u6210\u4e3a\u62bd\u8c61\u7c7b\u3002<\/li>\n<\/ul>\n<\/li>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Shape<\/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\">virtual<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">area<\/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<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Circle<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Shape<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">Circle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> r<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">radius<\/span><span class=\"token punctuation\">(<\/span>r<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">double<\/span> <span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">3.14159<\/span> <span class=\"token operator\">*<\/span> radius <span class=\"token operator\">*<\/span> radius<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\">double<\/span> radius<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\">Rectangle<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Shape<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">Rectangle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> w<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> h<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">width<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">height<\/span><span class=\"token punctuation\">(<\/span>h<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">double<\/span> <span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> width <span class=\"token operator\">*<\/span> height<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\">double<\/span> width<span class=\"token punctuation\">,<\/span> height<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Shape<span class=\"token operator\">*<\/span> shape1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">Circle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Shape<span class=\"token operator\">*<\/span> shape2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">Rectangle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4.0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Circle area: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> shape1<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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;Rectangle area: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> shape2<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">delete<\/span> shape1<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">delete<\/span> shape2<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>Shape \u7c7b\u4e2d\u7684 area \u51fd\u6570\u662f\u7eaf\u865a\u51fd\u6570\u3002Circle \u548c Rectangle \u7c7b\u7ee7\u627f\u81ea Shape \u7c7b&#xff0c;\u5e76\u5b9e\u73b0\u4e86 area \u51fd\u6570\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f&#xff0c;\u5f3a\u5236\u6d3e\u751f\u7c7b\u63d0\u4f9b\u81ea\u5df1\u7684 area \u8ba1\u7b97\u65b9\u6cd5&#xff0c;\u540c\u65f6\u5229\u7528\u57fa\u7c7b\u6307\u9488\u5b9e\u73b0\u591a\u6001\u8c03\u7528\u3002<\/li>\n<\/ul>\n<li>\n<p>\u865a\u51fd\u6570\u5b9e\u73b0\u673a\u5236<\/p>\n<ul>\n<li>\u865a\u51fd\u6570\u8868&#xff08;Virtual Table&#xff0c;\u7b80\u79f0 vtable&#xff09;&#xff1a;\u5f53\u4e00\u4e2a\u7c7b\u4e2d\u5305\u542b\u865a\u51fd\u6570\u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u4e3a\u8be5\u7c7b\u521b\u5efa\u4e00\u4e2a\u865a\u51fd\u6570\u8868\u3002\u865a\u51fd\u6570\u8868\u662f\u4e00\u4e2a\u5b58\u50a8\u7c7b\u6210\u5458\u865a\u51fd\u6570\u6307\u9488\u7684\u6570\u7ec4\u3002\u6bcf\u4e2a\u5305\u542b\u865a\u51fd\u6570\u7684\u7c7b\u90fd\u6709\u81ea\u5df1\u7684\u865a\u51fd\u6570\u8868\u3002<\/li>\n<li>\u865a\u6307\u9488&#xff08;Virtual Pointer&#xff0c;\u7b80\u79f0 vptr&#xff09;&#xff1a;\u6bcf\u4e2a\u5305\u542b\u865a\u51fd\u6570\u7684\u5bf9\u8c61\u90fd\u5305\u542b\u4e00\u4e2a\u6307\u5411\u5176\u6240\u5c5e\u7c7b\u7684\u865a\u51fd\u6570\u8868\u7684\u6307\u9488&#xff0c;\u5373\u865a\u6307\u9488\u3002\u5f53\u5bf9\u8c61\u88ab\u521b\u5efa\u65f6&#xff0c;\u865a\u6307\u9488\u88ab\u521d\u59cb\u5316&#xff0c;\u6307\u5411\u8be5\u5bf9\u8c61\u6240\u5c5e\u7c7b\u7684\u865a\u51fd\u6570\u8868\u3002<\/li>\n<li>\u8c03\u7528\u8fc7\u7a0b&#xff1a;\u5f53\u901a\u8fc7\u57fa\u7c7b\u6307\u9488\u6216\u5f15\u7528\u8c03\u7528\u865a\u51fd\u6570\u65f6&#xff0c;\u9996\u5148\u6839\u636e\u5bf9\u8c61\u7684\u865a\u6307\u9488\u627e\u5230\u5bf9\u5e94\u7684\u865a\u51fd\u6570\u8868&#xff0c;\u7136\u540e\u5728\u865a\u51fd\u6570\u8868\u4e2d\u67e5\u627e\u4e0e\u88ab\u8c03\u7528\u51fd\u6570\u5bf9\u5e94\u7684\u6307\u9488&#xff0c;\u6700\u540e\u901a\u8fc7\u8be5\u6307\u9488\u8c03\u7528\u5b9e\u9645\u7684\u51fd\u6570\u3002\u4f8b\u5982&#xff0c;\u5728\u4e0a\u8ff0 Animal \u7c7b\u53ca\u5176\u6d3e\u751f\u7c7b\u7684\u4f8b\u5b50\u4e2d&#xff0c;animal1 \u548c animal2 \u5bf9\u8c61\u90fd\u6709\u81ea\u5df1\u7684\u865a\u6307\u9488&#xff0c;\u5206\u522b\u6307\u5411 Dog \u548c Cat \u7c7b\u7684\u865a\u51fd\u6570\u8868\u3002\u5f53\u8c03\u7528 animal1-&gt;speak() \u65f6&#xff0c;\u901a\u8fc7 animal1 \u7684\u865a\u6307\u9488\u627e\u5230 Dog \u7c7b\u7684\u865a\u51fd\u6570\u8868&#xff0c;\u518d\u4ece\u865a\u51fd\u6570\u8868\u4e2d\u627e\u5230 speak \u51fd\u6570\u7684\u6307\u9488\u5e76\u8c03\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u865a\u51fd\u6570\u8868\u7684\u7ec6\u8282<\/p>\n<ul>\n<li>\u5e03\u5c40&#xff1a;\u865a\u51fd\u6570\u8868\u4e2d\u7684\u51fd\u6570\u6307\u9488\u6309\u7167\u865a\u51fd\u6570\u5728\u7c7b\u4e2d\u58f0\u660e\u7684\u987a\u5e8f\u6392\u5217\u3002\u5982\u679c\u6d3e\u751f\u7c7b\u8986\u76d6\u4e86\u57fa\u7c7b\u7684\u865a\u51fd\u6570&#xff0c;\u865a\u51fd\u6570\u8868\u4e2d\u76f8\u5e94\u4f4d\u7f6e\u7684\u6307\u9488\u4f1a\u88ab\u66ff\u6362\u4e3a\u6d3e\u751f\u7c7b\u4e2d\u8be5\u865a\u51fd\u6570\u7684\u5b9e\u73b0\u5730\u5740\u3002<\/li>\n<li>\u591a\u91cd\u7ee7\u627f&#xff1a;\u5728\u591a\u91cd\u7ee7\u627f\u7684\u60c5\u51b5\u4e0b&#xff0c;\u4e00\u4e2a\u5bf9\u8c61\u53ef\u80fd\u6709\u591a\u4e2a\u865a\u6307\u9488&#xff0c;\u5206\u522b\u6307\u5411\u4e0d\u540c\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u8868\u3002\u8fd9\u662f\u56e0\u4e3a\u4e0d\u540c\u57fa\u7c7b\u53ef\u80fd\u6709\u4e0d\u540c\u7684\u865a\u51fd\u6570\u96c6\u5408\u3002\u4f8b\u5982&#xff0c;\u5f53\u4e00\u4e2a\u7c7b\u4ece\u591a\u4e2a\u5305\u542b\u865a\u51fd\u6570\u7684\u57fa\u7c7b\u6d3e\u751f\u65f6&#xff0c;\u6bcf\u4e2a\u57fa\u7c7b\u7684\u865a\u51fd\u6570\u8868\u90fd\u9700\u8981\u88ab\u6b63\u786e\u7ba1\u7406&#xff0c;\u4ee5\u786e\u4fdd\u865a\u51fd\u6570\u8c03\u7528\u7684\u6b63\u786e\u6027\u3002<\/li>\n<li>\u8fd0\u884c\u65f6\u5f00\u9500&#xff1a;\u865a\u51fd\u6570\u673a\u5236\u5e26\u6765\u4e86\u8fd0\u884c\u65f6\u7684\u989d\u5916\u5f00\u9500&#xff0c;\u4e3b\u8981\u5305\u62ec\u5b58\u50a8\u865a\u6307\u9488\u7684\u7a7a\u95f4\u5f00\u9500\u4ee5\u53ca\u901a\u8fc7\u865a\u6307\u9488\u548c\u865a\u51fd\u6570\u8868\u67e5\u627e\u51fd\u6570\u6307\u9488\u7684\u65f6\u95f4\u5f00\u9500\u3002\u7136\u800c&#xff0c;\u8fd9\u79cd\u5f00\u9500\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u662f\u53ef\u4ee5\u63a5\u53d7\u7684&#xff0c;\u5e76\u4e14\u4e3aC&#043;&#043; \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u591a\u6001\u6027\u652f\u6301\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u865a\u51fd\u6570\u4e0e\u7eaf\u865a\u51fd\u6570<\/p>\n<ul>\n<li>\u6790\u6784\u51fd\u6570\u7684\u865a\u5c5e\u6027&#xff1a;\n<ul>\n<li>\u91cd\u8981\u6027&#xff1a;\u5f53\u57fa\u7c7b\u6307\u9488\u6307\u5411\u6d3e\u751f\u7c7b\u5bf9\u8c61&#xff0c;\u5e76\u4e14\u901a\u8fc7\u8be5\u6307\u9488\u5220\u9664\u5bf9\u8c61\u65f6&#xff0c;\u5982\u679c\u57fa\u7c7b\u6790\u6784\u51fd\u6570\u4e0d\u662f\u865a\u51fd\u6570&#xff0c;\u90a3\u4e48\u53ea\u4f1a\u8c03\u7528\u57fa\u7c7b\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u6d3e\u751f\u7c7b\u7684\u6790\u6784\u51fd\u6570\u4e0d\u4f1a\u88ab\u8c03\u7528&#xff0c;\u8fd9\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u3002\u4f8b\u5982&#xff1a;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Base<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">Base<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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 destructor&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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><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> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">Derived<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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;Derived destructor&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Base<span class=\"token operator\">*<\/span> basePtr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">Derived<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">delete<\/span> basePtr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p> &#8211; **\u8f93\u51fa**&#xff1a;\u53ea\u4f1a\u8f93\u51fa \u201cBase destructor\u201d\u3002\u4f46\u5982\u679c\u5c06 &#096;Base&#096; \u7c7b\u7684\u6790\u6784\u51fd\u6570\u58f0\u660e\u4e3a\u865a\u51fd\u6570 &#096;virtual ~Base()&#096;&#xff0c;\u5219\u4f1a\u5148\u8c03\u7528 &#096;Derived&#096; \u7c7b\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u518d\u8c03\u7528 &#096;Base&#096; \u7c7b\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u786e\u4fdd\u8d44\u6e90\u6b63\u786e\u91ca\u653e\u3002<\/p>\n<ul>\n<li>\u7eaf\u865a\u6790\u6784\u51fd\u6570&#xff1a;\u7eaf\u865a\u6790\u6784\u51fd\u6570\u662f\u4e00\u79cd\u7279\u6b8a\u60c5\u51b5&#xff0c;\u4e00\u4e2a\u7c7b\u53ef\u4ee5\u6709\u7eaf\u865a\u6790\u6784\u51fd\u6570&#xff0c;\u4f46\u5fc5\u987b\u5728\u7c7b\u5916\u63d0\u4f9b\u51fd\u6570\u4f53\u3002\u4f8b\u5982&#xff1a;<\/li>\n<\/ul>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AbstractClass<\/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\">virtual<\/span> <span class=\"token operator\">~<\/span><span class=\"token function\">AbstractClass<\/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<p><span class=\"token class-name\">AbstractClass<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token operator\">~<\/span><span class=\"token function\">AbstractClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <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;AbstractClass destructor&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConcreteClass<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">AbstractClass<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">ConcreteClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <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;ConcreteClass destructor&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<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<ul>\n<li>\u865a\u51fd\u6570\u4e0e\u6a21\u677f&#xff1a;\u6a21\u677f\u5143\u7f16\u7a0b\u4e2d&#xff0c;\u865a\u51fd\u6570\u7684\u4f7f\u7528\u9700\u8981\u7279\u522b\u6ce8\u610f\u3002\u6a21\u677f\u662f\u5728\u7f16\u8bd1\u671f\u8fdb\u884c\u5b9e\u4f8b\u5316\u7684&#xff0c;\u800c\u865a\u51fd\u6570\u662f\u8fd0\u884c\u65f6\u591a\u6001\u7684\u57fa\u7840\u3002\u5f53\u6a21\u677f\u7c7b\u4e0e\u865a\u51fd\u6570\u7ed3\u5408\u65f6&#xff0c;\u7531\u4e8e\u6a21\u677f\u7684\u5b9e\u4f8b\u5316\u673a\u5236&#xff0c;\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u4e0d\u6613\u5bdf\u89c9\u7684\u95ee\u9898\u3002\u4f8b\u5982&#xff0c;\u6a21\u677f\u7c7b\u4e2d\u7684\u865a\u51fd\u6570\u53ef\u80fd\u4e0d\u4f1a\u50cf\u9884\u671f\u90a3\u6837\u5728\u6d3e\u751f\u7c7b\u4e2d\u88ab\u6b63\u786e\u8986\u76d6&#xff0c;\u56e0\u4e3a\u6a21\u677f\u7684\u5b9e\u4f8b\u5316\u662f\u57fa\u4e8e\u4e0d\u540c\u7684\u6a21\u677f\u53c2\u6570&#xff0c;\u6bcf\u4e2a\u5b9e\u4f8b\u5316\u53ef\u80fd\u4f1a\u6709\u4e0d\u540c\u7684\u865a\u51fd\u6570\u8868\u5e03\u5c40\u3002<\/li>\n<\/ul>\n<li>\u865a\u51fd\u6570\u5b9e\u73b0\u673a\u5236\u4e0e\u865a\u51fd\u6570\u8868\n<ul>\n<li>\u865a\u51fd\u6570\u8868\u4e0e\u52a8\u6001\u7ed1\u5b9a&#xff1a;\u52a8\u6001\u7ed1\u5b9a\u662f\u6307\u5728\u8fd0\u884c\u65f6\u6839\u636e\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\u6765\u786e\u5b9a\u8c03\u7528\u54ea\u4e2a\u865a\u51fd\u6570\u7684\u8fc7\u7a0b\u3002\u865a\u51fd\u6570\u8868\u662f\u5b9e\u73b0\u52a8\u6001\u7ed1\u5b9a\u7684\u5173\u952e\u3002\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u751f\u6210\u865a\u51fd\u6570\u8868&#xff0c;\u8fd0\u884c\u65f6\u901a\u8fc7\u865a\u6307\u9488\u548c\u865a\u51fd\u6570\u8868\u8fdb\u884c\u51fd\u6570\u8c03\u7528\u3002\u4f46\u5728\u4e00\u4e9b\u4f18\u5316\u573a\u666f\u4e0b&#xff0c;\u5982\u5728\u7f16\u8bd1\u671f\u80fd\u591f\u786e\u5b9a\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b&#xff08;\u4f8b\u5982\u901a\u8fc7 constexpr \u6761\u4ef6\u5224\u65ad\u7b49&#xff09;&#xff0c;\u7f16\u8bd1\u5668\u53ef\u80fd\u4f1a\u8fdb\u884c\u9759\u6001\u7ed1\u5b9a&#xff0c;\u76f4\u63a5\u8c03\u7528\u76f8\u5e94\u7684\u51fd\u6570&#xff0c;\u800c\u4e0d\u901a\u8fc7\u865a\u51fd\u6570\u8868\u673a\u5236&#xff0c;\u4ee5\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li>\u865a\u51fd\u6570\u8868\u4e0e\u5185\u5b58\u5bf9\u9f50&#xff1a;\u7531\u4e8e\u865a\u6307\u9488\u7684\u5b58\u5728&#xff0c;\u5bf9\u8c61\u7684\u5185\u5b58\u5e03\u5c40\u53ef\u80fd\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u865a\u6307\u9488\u7684\u5927\u5c0f\u901a\u5e38\u4e0e\u673a\u5668\u7684\u6307\u9488\u5927\u5c0f\u76f8\u540c&#xff08;\u4f8b\u5982\u5728 64 \u4f4d\u7cfb\u7edf\u4e2d\u4e3a 8 \u5b57\u8282&#xff09;\u3002\u4e3a\u4e86\u6ee1\u8db3\u5185\u5b58\u5bf9\u9f50\u7684\u8981\u6c42&#xff0c;\u5bf9\u8c61\u7684\u5927\u5c0f\u53ef\u80fd\u4f1a\u589e\u52a0\u3002\u4f8b\u5982&#xff0c;\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a int \u6210\u5458\u53d8\u91cf&#xff08;\u901a\u5e38 4 \u5b57\u8282&#xff09;&#xff0c;\u4f46\u5982\u679c\u5b83\u5305\u542b\u865a\u51fd\u6570&#xff0c;\u52a0\u4e0a 8 \u5b57\u8282\u7684\u865a\u6307\u9488&#xff0c;\u5e76\u4e14\u6309\u7167 8 \u5b57\u8282\u5bf9\u9f50&#xff0c;\u5bf9\u8c61\u7684\u5927\u5c0f\u5c31\u4f1a\u53d8\u4e3a 8 \u5b57\u8282&#xff0c;\u800c\u4e0d\u662f 4 &#043; 8 &#061; 12 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