{"id":48794,"date":"2024-12-02T10:39:01","date_gmt":"2024-12-02T02:39:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/48794\/"},"modified":"2024-12-02T10:39:01","modified_gmt":"2024-12-02T02:39:01","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e6%8a%bd%e8%b1%a1%e7%b1%bb%e5%8f%af%e4%bb%a5%e6%b2%a1%e6%9c%89%e6%8a%bd%e8%b1%a1%e6%96%b9%e6%b3%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/48794\/","title":{"rendered":"\u4e3a\u4ec0\u4e48\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u4e3a\u4ec0\u4e48\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff1f<\/h1>\n<p>\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd<span style=\"color: #FF6600;, Helvetica, Arial, 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alt=\"\u4e3a\u4ec0\u4e48\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u62bd\u8c61\u7c7b\u4e3a\u4f55\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff1f<\/strong><\/p>\n<p>\u5c3d\u7ba1\u6709\u8bf4\u6cd5\u79f0\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\u7684\u62bd\u8c61\u7c7b\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u4f46\u5728\u5b9e\u9645\u9879\u76ee\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u4ecd\u7136\u65f6\u5e38\u53ef\u4ee5\u770b\u5230\u5b9a\u4e49\u4e3a\u62bd\u8c61\u7c7b\u4f46\u4e0d\u5305\u542b\u4efb\u4f55\u62bd\u8c61\u65b9\u6cd5\u7684\u57fa\u7c7b\u3002\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u79cd\u770b\u4f3c\u77db\u76fe\u7684\u60c5\u51b5\u5462\uff1f<\/p>\n<p><strong>\u6307\u9488\u7c7b\u578b\u5b89\u5168<\/strong><\/p>\n<p>\u4e3b\u8981\u539f\u56e0\u5728\u4e8e\u6307\u9488\u7c7b\u578b\u5b89\u5168\u3002\u5728 c++ \u4e2d\uff0c\u6307\u9488\u6307\u5411\u7684\u7c7b\u578b\u5fc5\u987b\u4e0e\u58f0\u660e\u6307\u9488\u65f6\u6307\u5b9a\u7684\u7c7b\u578b\u4e00\u81f4\u3002\u8003\u8651\u4ee5\u4e0b\u793a\u4f8b\uff1a<\/p>\n<pre>class base {};\n\nclass derived : public base {};\n\nbase* baseptr = new derived();<\/pre>\n<p>\u7531\u4e8e derived \u7ee7\u627f\u81ea base\uff0c\u56e0\u6b64 derived* \u6307\u9488\u4e5f\u53ef\u4ee5\u5b89\u5168\u5730\u8f6c\u6362\u4e3a base* \u6307\u9488\u3002\u4f46\u662f\uff0c\u5982\u679c base \u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff08\u4f46\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff09\uff0c\u5219\u60c5\u51b5\u5c31\u4e0d\u4e00\u6837\u4e86\uff1a<\/p>\n<pre>class Base { virtual void dummy() {} };\n\/\/ \u6ce8\u610f\uff1a`dummy()` \u662f\u4e00\u4e2a\u7eaf\u865a\u51fd\u6570\uff0c\u4f46\u6ca1\u6709\u5b9a\u4e49\u5b9e\u73b0\n\nclass Derived : public Base {};\n\nBase* basePtr = new Derived();<\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cbaseptr \u6307\u5411\u7684\u662f\u4e00\u4e2a derived \u5bf9\u8c61\uff0c\u4f46\u5b83\u53ea\u80fd\u8c03\u7528 base \u4e2d\u7684\u6210\u5458\u51fd\u6570\u3002\u5982\u679c\u5c1d\u8bd5\u8c03\u7528 derived 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\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300a\u4e3a\u4ec0\u4e48\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff1f\u300b\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01 \u62bd\u8c61\u7c7b\u4e3a\u4f55\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff1f \u5c3d\u7ba1\u6709\u8bf4\u6cd5\u79f0\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\u7684\u62bd\u8c61\u7c7b\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u4f46\u5728\u5b9e\u9645\u9879\u76ee\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u4ecd\u7136\u65f6\u5e38\u53ef\u4ee5\u770b\u5230\u5b9a\u4e49\u4e3a\u62bd\u8c61\u7c7b\u4f46\u4e0d\u5305\u542b\u4efb\u4f55\u62bd\u8c61\u65b9\u6cd5\u7684\u57fa\u7c7b\u3002\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u79cd\u770b\u4f3c\u77db\u76fe\u7684\u60c5\u51b5\u5462\uff1f \u6307\u9488\u7c7b\u578b\u5b89\u5168 \u4e3b\u8981\u539f\u56e0\u5728\u4e8e\u6307\u9488\u7c7b\u578b\u5b89\u5168\u3002\u5728 c++ \u4e2d\uff0c\u6307\u9488\u6307\u5411\u7684\u7c7b\u578b\u5fc5\u987b\u4e0e\u58f0\u660e\u6307\u9488\u65f6\u6307\u5b9a\u7684\u7c7b\u578b\u4e00\u81f4\u3002\u8003\u8651\u4ee5\u4e0b\u793a\u4f8b\uff1a class base {}; class derived : public base {}; base* baseptr = new derived(); \u7531\u4e8e derived \u7ee7\u627f\u81ea base\uff0c\u56e0\u6b64 derived* \u6307\u9488\u4e5f\u53ef\u4ee5\u5b89\u5168\u5730\u8f6c\u6362\u4e3a base* \u6307\u9488\u3002\u4f46\u662f\uff0c\u5982\u679c base \u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff08\u4f46\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\uff09\uff0c\u5219\u60c5\u51b5\u5c31\u4e0d\u4e00\u6837\u4e86\uff1a class Base { virtual void dummy() {} }; \/\/ \u6ce8\u610f\uff1a`dummy()` \u662f\u4e00\u4e2a\u7eaf\u865a\u51fd\u6570\uff0c\u4f46\u6ca1\u6709\u5b9a\u4e49\u5b9e\u73b0 class Derived : public Base {}; Base* basePtr = new Derived(); \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cbaseptr [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-48794","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/48794","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=48794"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/48794\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=48794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=48794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=48794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}