{"id":302382,"date":"2024-05-20T18:34:02","date_gmt":"2024-05-20T10:34:02","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/302382.html"},"modified":"2024-05-20T18:34:21","modified_gmt":"2024-05-20T10:34:21","slug":"c-%e6%88%90%e5%91%98%e5%87%bd%e6%95%b0%e5%a3%b0%e6%98%8e%e5%90%8e%e5%8a%a0%e6%88%96%e8%a1%a8%e7%a4%ba%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/302382.html","title":{"rendered":"c  \u6210\u5458\u51fd\u6570\u58f0\u660e()\u540e\u52a0&amp;\u6216&amp;&amp;\u8868\u793a\u4ec0\u4e48"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26214605\/a1892fb7-ef32-4f21-9bb4-cb02dad053b0.webp\" alt=\"c  \u6210\u5458\u51fd\u6570\u58f0\u660e()\u540e\u52a0&amp;\u6216&amp;&amp;\u8868\u793a\u4ec0\u4e48\" \/><\/p>\n<p><p>C++\u4e2d\uff0c\u6210\u5458\u51fd\u6570\u58f0\u660e\u540e\u6dfb\u52a0 <code>&amp;<\/code> \u6216 <code>&amp;&amp;<\/code> \u8868\u660e\u8fd9\u4e2a\u6210\u5458\u51fd\u6570\u662f\u9488\u5bf9\u5de6\u503c\u5bf9\u8c61\u8fd8\u662f\u53f3\u503c\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c\u7684\u3002\u5177\u4f53\u6765\u8bf4\uff0c<strong>\u5728\u6210\u5458\u51fd\u6570\u58f0\u660e\u540e\u52a0\u4e0a <code>&amp;<\/code> \u8868\u793a\u8be5\u6210\u5458\u51fd\u6570\u53ea\u80fd\u88ab\u5de6\u503c\u5bf9\u8c61\u8c03\u7528\u3001\u800c\u52a0\u4e0a <code>&amp;&amp;<\/code> \u8868\u793a\u8be5\u6210\u5458\u51fd\u6570\u53ea\u80fd\u88ab\u53f3\u503c\u5bf9\u8c61\u8c03\u7528<\/strong>\u3002\u8fd9\u79cd\u6280\u672f\u662fC++11\u5f15\u5165\u7684\uff0c\u7528\u4e8e\u652f\u6301\u79fb\u52a8\u8bed\u4e49\u548c\u66f4\u7cbe\u7ec6\u5730\u63a7\u5236\u5bf9\u8c61\u7684\u884c\u4e3a\u3002<\/p>\n<\/p>\n<p><p>\u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u8fd9\u4e2a\u6982\u5ff5\uff0c\u6211\u4eec\u5148\u5bf9\u201c\u5de6\u503c\u201d\u548c\u201c\u53f3\u503c\u201d\u7684\u533a\u522b\u505a\u4e00\u4e2a\u7b80\u8981\u8bf4\u660e\u3002\u5de6\u503c\u6307\u7684\u662f\u8868\u8fbe\u5f0f\u7ed3\u675f\u540e\u4f9d\u7136\u5b58\u5728\u7684\u5bf9\u8c61\uff0c\u6bd4\u5982\u53d8\u91cf\u3001\u6570\u7ec4\u5143\u7d20\u7b49\uff1b\u800c\u53f3\u503c\u6307\u7684\u662f\u4e34\u65f6\u5bf9\u8c61\u6216\u90a3\u4e9b\u8868\u8fbe\u5f0f\u7ed3\u675f\u5c31\u4e0d\u518d\u5b58\u5728\u7684\u5bf9\u8c61\u3002\u5728C++11\u4e2d\uff0c\u901a\u8fc7\u5f15\u5165\u53f3\u503c\u5f15\u7528\uff08\u4f7f\u7528 <code>&amp;&amp;<\/code> \u8868\u793a\uff09\uff0c\u5141\u8bb8\u6211\u4eec\u66f4\u9ad8\u6548\u5730\u5904\u7406\u4e34\u65f6\u5bf9\u8c61\uff0c\u5c24\u5176\u662f\u5728\u5bf9\u8c61\u4f20\u9012\u548c\u8fd4\u56de\u65f6\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u5de6\u503c\u5f15\u7528\u4e0e\u53f3\u503c\u5f15\u7528<\/h3>\n<\/p>\n<p><p>\u5728\u6df1\u5165\u4e86\u89e3\u6210\u5458\u51fd\u6570\u540e\u52a0 <code>&amp;<\/code> \u548c <code>&amp;&amp;<\/code> \u7684\u91cd\u8981\u6027\u4e4b\u524d\uff0c\u6211\u4eec\u9996\u5148\u8981\u4e86\u89e3C++11\u4e2d\u7684\u4e24\u4e2a\u57fa\u672c\u6982\u5ff5\uff1a\u5de6\u503c\u5f15\u7528\u548c\u53f3\u503c\u5f15\u7528\u3002\u5de6\u503c\u5f15\u7528\u662f\u6211\u4eec\u5728\u4e4b\u524d\u7248\u672c\u7684C++\u4e2d\u5e38\u89c1\u7684\u5f15\u7528\u7c7b\u578b\uff0c\u4f7f\u7528\u5355\u4e2a <code>&amp;<\/code> \u7b26\u53f7\u8868\u793a\u3002\u800c\u53f3\u503c\u5f15\u7528\u662fC++11\u4e2d\u65b0\u5f15\u5165\u7684\uff0c\u4f7f\u7528 <code>&amp;&amp;<\/code> \u8868\u793a\uff0c\u5b83\u4e3b\u8981\u7528\u4e8e\u5f15\u7528\u4e34\u65f6\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><p>\u5de6\u503c\u5f15\u7528\u5141\u8bb8\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u7684\u522b\u540d\uff0c\u800c\u53f3\u503c\u5f15\u7528\u5219\u5141\u8bb8\u6211\u4eec\u5728\u4e0d\u4ea7\u751f\u5bf9\u8c61\u62f7\u8d1d\u7684\u60c5\u51b5\u4e0b\uff0c\u5f15\u7528\u5230\u4e00\u4e2a\u5373\u5c06\u88ab\u9500\u6bc1\u7684\u4e34\u65f6\u5bf9\u8c61\u3002\u8fd9\u5c31\u4e3a\u79fb\u52a8\u8bed\u4e49\uff08Move Semantics\uff09\u63d0\u4f9b\u4e86\u57fa\u7840\uff0c\u4f7f\u5f97\u8d44\u6e90\u7684\u8f6c\u79fb\u66f4\u4e3a\u9ad8\u6548\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u6210\u5458\u51fd\u6570\u540e\u52a0 <code>&amp;<\/code> \u548c <code>&amp;&amp;<\/code><\/h3>\n<\/p>\n<p><p>\u5f53\u6211\u4eec\u5728\u6210\u5458\u51fd\u6570\u540e\u52a0\u4e0a <code>&amp;<\/code> \u6216 <code>&amp;&amp;<\/code> \u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u5728\u5229\u7528C++\u7684\u91cd\u8f7d\u5206\u8fa8\u673a\u5236\uff0c\u6765\u533a\u5206\u51fd\u6570\u5bf9\u5de6\u503c\u5bf9\u8c61\u548c\u53f3\u503c\u5bf9\u8c61\u7684\u5904\u7406\u3002\u8fd9\u79cd\u673a\u5236\u5728\u8bbe\u8ba1\u7c7b\u7684\u65f6\u5019\u975e\u5e38\u6709\u7528\uff0c\u5c24\u5176\u662f\u5728\u6d89\u53ca\u5230<a href=\"https:\/\/docs.pingcode.com\/blog\/project-management\/58557.html\" target=\"_blank\">\u8d44\u6e90\u7ba1\u7406<\/a>\u548c\u4f18\u5316\u6027\u80fd\u65f6\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u7c7b\uff0c\u5b83\u5305\u542b\u4e86\u4e00\u4e9b\u52a8\u6001\u5206\u914d\u7684\u8d44\u6e90\u3002\u6211\u4eec\u53ef\u4ee5\u4e3a\u8fd9\u4e2a\u7c7b\u63d0\u4f9b\u4e24\u4e2a\u7248\u672c\u7684\u6210\u5458\u51fd\u6570\uff0c\u4e00\u4e2a\u4f7f\u7528 <code>&amp;<\/code> \u4fee\u9970\uff0c\u7528\u4e8e\u5904\u7406\u5de6\u503c\u5bf9\u8c61\uff0c\u53e6\u4e00\u4e2a\u4f7f\u7528 <code>&amp;&amp;<\/code> \u4fee\u9970\uff0c\u4e13\u95e8\u5904\u7406\u53f3\u503c\u5bf9\u8c61\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53f3\u503c\u7248\u672c\u7684\u51fd\u6570\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8d44\u6e90\u62f7\u8d1d\uff0c\u76f4\u63a5\u63a5\u7ba1\u4e34\u65f6\u5bf9\u8c61\u7684\u8d44\u6e90\uff0c\u4ece\u800c\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5b9e\u73b0\u793a\u4f8b<\/h3>\n<\/p>\n<p><p>\u4e3a\u4e86\u66f4\u6e05\u6670\u5730\u5c55\u793a\u8fd9\u4e00\u673a\u5236\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u5b9e\u73b0\u793a\u4f8b\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-cpp\">class MyClass {<\/p>\n<p>public:<\/p>\n<p>    MyClass&amp; operator=(const MyClass&amp; other) &amp; {<\/p>\n<p>        \/\/ \u5904\u7406\u8d4b\u503c\u64cd\u4f5c\uff0c\u9002\u7528\u4e8e\u5de6\u503c\u5bf9\u8c61<\/p>\n<p>        if (this != &amp;other) {<\/p>\n<p>            \/\/ \u5b9e\u9645\u7684\u8d4b\u503c\u64cd\u4f5c<\/p>\n<p>        }<\/p>\n<p>        return *this;<\/p>\n<p>    }<\/p>\n<p>    MyClass&amp; operator=(MyClass&amp;&amp; other) &amp;&amp; {<\/p>\n<p>        \/\/ \u9002\u7528\u4e8e\u53f3\u503c\u5bf9\u8c61\u7684\u8d4b\u503c\u64cd\u4f5c<\/p>\n<p>        if (this != &amp;other) {<\/p>\n<p>            \/\/ \u5b9e\u73b0\u8d44\u6e90\u7684\u79fb\u52a8\u800c\u975e\u62f7\u8d1d<\/p>\n<p>        }<\/p>\n<p>        return *this;<\/p>\n<p>    }<\/p>\n<p>};<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4e3a <code>MyClass<\/code> \u7c7b\u63d0\u4f9b\u4e86\u4e24\u4e2a\u7248\u672c\u7684\u8d4b\u503c\u64cd\u4f5c\u7b26\u91cd\u8f7d\u51fd\u6570\u3002\u7b2c\u4e00\u4e2a\u7248\u672c\u4f7f\u7528 <code>&amp;<\/code> \u4fee\u9970\uff0c\u5b83\u5904\u7406\u7684\u662f\u5f53\u5de6\u503c\u5bf9\u8c61\u9700\u8981\u8d4b\u503c\u65f6\u7684\u60c5\u51b5\uff1b\u7b2c\u4e8c\u4e2a\u7248\u672c\u4f7f\u7528 <code>&amp;&amp;<\/code> \u4fee\u9970\uff0c\u5b83\u9488\u5bf9\u7684\u662f\u53f3\u503c\u5bf9\u8c61\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5bf9\u8c61\u662f\u5de6\u503c\u8fd8\u662f\u53f3\u503c\uff0c\u9009\u62e9\u6700\u5408\u9002\u7684\u5904\u7406\u65b9\u5f0f\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u6548\u679c\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u597d\u5904\u4e0e\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n<p><p>\u901a\u8fc7\u7ed9\u6210\u5458\u51fd\u6570\u6dfb\u52a0 <code>&amp;<\/code> \u6216 <code>&amp;&amp;<\/code> 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<code>&amp;<\/code> \u6216 <code>&amp;&amp;<\/code> 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