{"id":68,"date":"2023-05-26T18:31:11","date_gmt":"2023-05-26T10:31:11","guid":{"rendered":"https:\/\/code.lingapi.top\/?p=68"},"modified":"2023-05-26T18:31:32","modified_gmt":"2023-05-26T10:31:32","slug":"lambda%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/code.lingapi.top\/?p=68","title":{"rendered":"lambda\u95ee\u9898"},"content":{"rendered":"\n<p>C++\u4e00\u4e2a\u5751\u3002\u5982\u679c\u76f4\u63a5\u6309\u503c\u6355\u83b7\u5916\u90e8\u5bf9\u8c61\uff0c\u90a3\u4e48\u5728lambda\u5185\u90e8\u4fee\u6539\u5b83\uff0c\u4f1a\u88ab\u89c6\u4e3a\u8bed\u6cd5\u9519\u8bef\uff0c\u4e0d\u80fd\u901a\u8fc7\u7f16\u8bd1\u3002\u4f46\u662f\u5728Class\u6210\u5458\u51fd\u6570\u4e2d\u6309\u503c\u6355\u83b7\u5916\u90e8\u6240\u6709\u7684\u5bf9\u8c61\uff0c\u5c06Class\u7684this\u6307\u9488\u8fd8\u6709Class\u5185\u90e8\u7684\u6210\u5458\u53d8\u91cf\u4e00\u8d77\u6355\u83b7\u4e86\uff0c\u76f4\u63a5\u4f7f\u7528\u53d8\u91cf\u540d\u8bbf\u95ee\u6210\u5458\u53d8\u91cf\u65f6\uff0c\u4f1a\u4ea7\u751f\u4e8c\u4e49\u6027\uff0c\u5b9e\u9645\u4e0a\u8bbf\u95ee\u7684\u662flambda\u6309\u503c\u6355\u83b7\u7684\u65f6\u5019\u62f7\u8d1d\u7684\u54ea\u4e00\u4e2a\uff0c\u800c\u4e0d\u662fthis\u6307\u5411\u5185\u5b58\u4e2d\u7684\u90a3\u4e2a\u3002\u539f\u672c\u6b63\u5e38\u60c5\u51b5\u4e0b\u8fd9\u6837\u4fee\u6539\u6309\u503c\u6355\u83b7\u7684\u5916\u90e8\u53d8\u91cf\u5c5e\u4e8e\u8bed\u6cd5\u9519\u8bef\uff0c\u4f46\u662f\u8fd9\u6837\u7279\u6b8a\u7684\u60c5\u666f\u4e0b\uff0c\u9519\u8bef\u7684\u4ee3\u7801\u4ee5\u4e00\u79cd\u9519\u8bef\u7684\u65b9\u6cd5\u8fd0\u884c\u4e86\u8d77\u6765\uff0c\u5e26\u6765\u7684\u9519\u8bef\u7684\u9884\u671f\u3002<br>\u4e0d\u8981\u8fc7\u5206\u76f8\u4fe1\u7f16\u8bd1\u5668\u3002<br>\u53c8\u8d9f\u4e86\u4e00\u4e2a\u5751<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">ChatGPT\u4ea4\u6d41\u8fc7\u7a0b<\/h2>\n\n\n\n<p><strong>S\uff1a<\/strong>std::function\u6309\u5f15\u7528\u4f20\u9012\u548c\u6309\u503c\u4f20\u9012\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f<\/p>\n\n\n\n<p><strong>ChatGPT\uff1a<\/strong>\u5728C++\u4e2d\uff0c<code>std::function<\/code>\u662f\u4e00\u4e2a\u901a\u7528\u7684\u51fd\u6570\u5305\u88c5\u5668\uff0c\u7528\u4e8e\u5b58\u50a8\u548c\u8c03\u7528\u53ef\u8c03\u7528\u5bf9\u8c61\uff08\u51fd\u6570\u3001\u51fd\u6570\u6307\u9488\u3001\u51fd\u6570\u5bf9\u8c61\u7b49\uff09\u3002<\/p>\n\n\n\n<p>\u5f53\u4f60\u4f7f\u7528<code>std::function<\/code>\u6309\u5f15\u7528\u4f20\u9012\u4e00\u4e2a\u53ef\u8c03\u7528\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u5c06\u8be5\u5bf9\u8c61\u7684\u5f15\u7528\u5b58\u50a8\u5728<code>std::function<\/code>\u4e2d\u3002\u8fd9\u610f\u5473\u7740\u5728\u8c03\u7528<code>std::function<\/code>\u65f6\uff0c\u5b83\u4ecd\u7136\u5f15\u7528\u539f\u59cb\u7684\u53ef\u8c03\u7528\u5bf9\u8c61\u3002\u4efb\u4f55\u5bf9<code>std::function<\/code>\u7684\u8c03\u7528\u90fd\u4f1a\u76f4\u63a5\u8c03\u7528\u539f\u59cb\u7684\u53ef\u8c03\u7528\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u5f53\u4f60\u4f7f\u7528<code>std::function<\/code>\u6309\u503c\u4f20\u9012\u4e00\u4e2a\u53ef\u8c03\u7528\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u590d\u5236\u8be5\u5bf9\u8c61\uff0c\u5e76\u5c06\u590d\u5236\u7684\u526f\u672c\u5b58\u50a8\u5728<code>std::function<\/code>\u4e2d\u3002\u8fd9\u610f\u5473\u7740\u5728\u8c03\u7528<code>std::function<\/code>\u65f6\uff0c\u5b83\u5c06\u8c03\u7528\u590d\u5236\u7684\u53ef\u8c03\u7528\u5bf9\u8c61\uff0c\u800c\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u7684\u53ef\u8c03\u7528\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u533a\u522b\u5728\u4e8e\u6309\u5f15\u7528\u4f20\u9012\u4f1a\u5171\u4eab\u539f\u59cb\u53ef\u8c03\u7528\u5bf9\u8c61\u7684\u72b6\u6001\u548c\u4fee\u6539\uff0c\u800c\u6309\u503c\u4f20\u9012\u4f1a\u590d\u5236\u53ef\u8c03\u7528\u5bf9\u8c61\u5e76\u72ec\u7acb\u7ef4\u62a4\u5176\u72b6\u6001\u3002\u8fd9\u610f\u5473\u7740\u6309\u5f15\u7528\u4f20\u9012\u53ef\u80fd\u5bf9\u539f\u59cb\u5bf9\u8c61\u7684\u4fee\u6539\u4ea7\u751f\u5f71\u54cd\uff0c\u800c\u6309\u503c\u4f20\u9012\u5219\u4e0d\u4f1a\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6309\u5f15\u7528\u4f20\u9012\u53ef\u80fd\u5b58\u5728\u60ac\u7a7a\u5f15\u7528\uff08dangling reference\uff09\u7684\u95ee\u9898\uff0c\u56e0\u4e3a\u539f\u59cb\u53ef\u8c03\u7528\u5bf9\u8c61\u53ef\u80fd\u5728<code>std::function<\/code>\u8c03\u7528\u4e4b\u524d\u88ab\u9500\u6bc1\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\uff0c\u786e\u4fdd\u5728\u4f7f\u7528<code>std::function<\/code>\u65f6\uff0c\u539f\u59cb\u53ef\u8c03\u7528\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u8db3\u591f\u957f\u3002<\/p>\n\n\n\n<p>\u9009\u62e9\u6309\u5f15\u7528\u4f20\u9012\u6216\u6309\u503c\u4f20\u9012<code>std::function<\/code>\u53d6\u51b3\u4e8e\u4f60\u5bf9\u53ef\u8c03\u7528\u5bf9\u8c61\u7684\u4f7f\u7528\u9700\u6c42\u3002\u5982\u679c\u4f60\u5e0c\u671b<code>std::function<\/code>\u80fd\u591f\u53cd\u6620\u539f\u59cb\u5bf9\u8c61\u7684\u4fee\u6539\uff0c\u5e76\u4e0e\u539f\u59cb\u5bf9\u8c61\u5171\u4eab\u72b6\u6001\uff0c\u90a3\u4e48\u9009\u62e9\u6309\u5f15\u7528\u4f20\u9012\u3002\u5982\u679c\u4f60\u5e0c\u671b<code>std::function<\/code>\u62e5\u6709\u72ec\u7acb\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u5bf9\u539f\u59cb\u5bf9\u8c61\u7684\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd<code>std::function<\/code>\u7684\u884c\u4e3a\uff0c\u90a3\u4e48\u9009\u62e9\u6309\u503c\u4f20\u9012\u3002<\/p>\n\n\n\n<p><strong>S\uff1a<\/strong>\u6211\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\uff0c\u5728\u4e00\u4e2a\u51fd\u6570\u5185\u90e8\u5c06\u4e00\u4e2astd::function\u5bf9\u8c61\u6309\u5f15\u7528\u8d4b\u7ed9\u4e00\u4e2a\u53d8\u91cf\uff0c\u4f46\u662f\u8fd9\u4e2a\u53d8\u91cf\u5728\u7b2c\u4e8c\u6b21\u88ab\u8c03\u7528\u65f6\u4f1a\u89e6\u53d1\u6bb5\u9519\u8bef\u5f02\u5e38\uff0c\u662f\u4e0d\u662f\u56e0\u4e3a\uff0c\u6309\u5f15\u7528\u4f20\u9012\u7684std::function\u5728\u79bb\u5f00\u4f5c\u7528\u57df\u540e\u88ab\u91ca\u653e\u4e86\uff1f<\/p>\n\n\n\n<p><strong>ChatGPT\uff1a<\/strong>\u662f\u7684\uff0c\u4f60\u7684\u731c\u6d4b\u662f\u6b63\u786e\u7684\u3002\u5f53\u4f60\u5c06\u4e00\u4e2a<code>std::function<\/code>\u5bf9\u8c61\u6309\u5f15\u7528\u4f20\u9012\u7ed9\u53e6\u4e00\u4e2a\u53d8\u91cf\uff0c\u5e76\u5728\u8be5\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u4e4b\u5916\u8c03\u7528\u5b83\u65f6\uff0c\u4f1a\u5bfc\u81f4\u60ac\u7a7a\u5f15\u7528\u7684\u95ee\u9898\u3002\u5f53\u539f\u59cb\u7684<code>std::function<\/code>\u5bf9\u8c61\u8d85\u51fa\u5176\u4f5c\u7528\u57df\u65f6\uff0c\u5b83\u88ab\u9500\u6bc1\uff0c\u800c\u6309\u5f15\u7528\u4f20\u9012\u7684\u53d8\u91cf\u5c06\u5f15\u7528\u4e00\u4e2a\u5df2\u7ecf\u65e0\u6548\u7684\u5bf9\u8c61\uff0c\u4ece\u800c\u5bfc\u81f4\u672a\u5b9a\u4e49\u7684\u884c\u4e3a\uff0c\u53ef\u80fd\u89e6\u53d1\u6bb5\u9519\u8bef\u5f02\u5e38\u3002<\/p>\n\n\n\n<p>\u8981\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\uff0c\u786e\u4fdd\u6309\u5f15\u7528\u4f20\u9012\u7684<code>std::function<\/code>\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u8db3\u591f\u957f\uff0c\u6216\u8005\u4f7f\u7528\u6309\u503c\u4f20\u9012\u6765\u590d\u5236<code>std::function<\/code>\u5bf9\u8c61\u3002\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u5728\u8c03\u7528\u65f6\uff0c<code>std::function<\/code>\u5bf9\u8c61\u4ecd\u7136\u6709\u6548\uff0c\u5e76\u4e14\u4e0d\u4f1a\u5f15\u8d77\u60ac\u7a7a\u5f15\u7528\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u6f14\u793a\u4e86\u6309\u5f15\u7528\u4f20\u9012<code>std::function<\/code>\u5bf9\u8c61\u53ef\u80fd\u5bfc\u81f4\u7684\u95ee\u9898\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>#include &lt;functional>\n#include &lt;iostream>\n\nstd::function&lt;int(int)> createFunction()\n{\n    int value = 10;\n    return [&amp;](int x) { return value + x; };  \/\/ \u6309\u5f15\u7528\u4f20\u9012std::function\u5bf9\u8c61\n}\n\nint main()\n{\n    std::function&lt;int(int)> func = createFunction();\n    int result = func(5);  \/\/ \u8c03\u7528std::function\u5bf9\u8c61\n\n    std::cout &lt;&lt; result &lt;&lt; std::endl;  \/\/ \u8f93\u51fa 15\n\n    result = func(10);  \/\/ \u7b2c\u4e8c\u6b21\u8c03\u7528std::function\u5bf9\u8c61\uff0c\u53ef\u80fd\u5bfc\u81f4\u6bb5\u9519\u8bef\u5f02\u5e38\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u5f53\u7b2c\u4e8c\u6b21\u8c03\u7528<code>func<\/code>\u65f6\uff0c\u7531\u4e8e<code>createFunction<\/code>\u51fd\u6570\u8fd4\u56de\u7684<code>std::function<\/code>\u5bf9\u8c61\u5df2\u7ecf\u8d85\u51fa\u4e86\u5176\u4f5c\u7528\u57df\uff0c\u6309\u5f15\u7528\u4f20\u9012\u7684\u53d8\u91cf<code>value<\/code>\u53d8\u6210\u4e86\u60ac\u7a7a\u5f15\u7528\uff0c\u5bfc\u81f4\u672a\u5b9a\u4e49\u7684\u884c\u4e3a\u3002<\/p>\n\n\n\n<p><strong>S\uff1a<\/strong>\u6211\u8c8c\u4f3c\u4e0d\u80fd\u6309\u503c\u4f20\u9012\u3002\u56e0\u4e3a\u6211\u7684lambda\u8868\u8fbe\u5f0f\u662f\u5728\u7c7b\u7684\u5185\u90e8\u4f7f\u7528\u7684\uff0clambda\u6309\u503c\u6355\u83b7\u4e86class\u5bf9\u8c61\u7684this\u6307\u9488\uff0c\u5b83\u9700\u8981\u4fee\u6539class\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u3002\u5728\u6309\u503c\u4f20\u9012std::function\u65f6\uff0clambda\u5185\u90e8\u5bf9class\u6210\u5458\u53d8\u91cf\u7684\u4fee\u6539\uff0c\u5bf9\u4e8eclass\u6765\u8bf4\u4e0d\u53ef\u89c1\u3002\u6839\u636e\u4f60\u56de\u7b54\u4e2d\u5173\u4e8e\u201c\u5f53\u4f60\u4f7f\u7528std::function\u6309\u503c\u4f20\u9012\u4e00\u4e2a\u53ef\u8c03\u7528\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u590d\u5236\u8be5\u5bf9\u8c61\uff0c\u5e76\u5c06\u590d\u5236\u7684\u526f\u672c\u5b58\u50a8\u5728std::function\u4e2d\u3002\u8fd9\u610f\u5473\u7740\u5728\u8c03\u7528std::function\u65f6\uff0c\u5b83\u5c06\u8c03\u7528\u590d\u5236\u7684\u53ef\u8c03\u7528\u5bf9\u8c61\uff0c\u800c\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u7684\u53ef\u8c03\u7528\u5bf9\u8c61\u3002\u201d\u7684\u5185\u5bb9\uff0c\u6211\u6000\u7591\u6309\u503c\u4f20\u9012std::function\u65f6\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684class\u7684\u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u5b83\u7684thiz\u6307\u9488\u6309\u503c\u6355\u83b7\u7ed9lambda\uff0c\u5bfc\u81f4\u6211\u5728lambda\u4e2d\u4fee\u6539\u7684\u6210\u5458\u53d8\u91cf\u662f\u65b0\u7684class\u5b9e\u4f8b\u4e2d\u7684\uff0c\u6240\u4ee5\u539f\u672c\u7684class\u5bf9\u8c61\u624d\u65e0\u6cd5\u611f\u77e5\u5230\u4fee\u6539\u3002\u4e0d\u77e5\u9053\u6211\u7684\u7406\u89e3\u662f\u5426\u6b63\u786e<\/p>\n\n\n\n<p><strong>ChatGPT\uff1a<\/strong>\u4f60\u7684\u7406\u89e3\u662f\u6b63\u786e\u7684\u3002\u5f53\u4f60\u6309\u503c\u4f20\u9012\u4e00\u4e2a<code>std::function<\/code>\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u526f\u672c\uff0c\u5305\u62ec\u5176\u4e2d\u6355\u83b7\u7684\u6240\u6709\u53d8\u91cf\u3002\u5bf9\u4e8e\u7c7b\u5bf9\u8c61\uff0c\u5b83\u4f1a\u590d\u5236\u6574\u4e2a\u5bf9\u8c61\uff0c\u5305\u62ec\u6210\u5458\u53d8\u91cf\u548c\u6210\u5458\u51fd\u6570\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0clambda\u8868\u8fbe\u5f0f\u4f1a\u6309\u503c\u6355\u83b7<code>this<\/code>\u6307\u9488\uff0c\u5373\u590d\u5236\u4e86\u6574\u4e2a\u7c7b\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u5f53\u4f60\u5728lambda\u5185\u90e8\u4fee\u6539\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u4fee\u6539\u4e86\u590d\u5236\u7684\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u539f\u59cb\u7684\u7c7b\u5bf9\u8c61\u3002\u8fd9\u662f\u56e0\u4e3a\u6309\u503c\u4f20\u9012\u7684<code>std::function<\/code>\u6301\u6709\u7684\u662f\u590d\u5236\u7684\u526f\u672c\uff0c\u5bf9\u590d\u5236\u7684\u526f\u672c\u8fdb\u884c\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u7684\u7c7b\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u4f60\u5e0c\u671b\u4fee\u6539\u539f\u59cb\u7684\u7c7b\u5bf9\u8c61\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u6309\u5f15\u7528\u6355\u83b7<code>this<\/code>\u6307\u9488\uff0c\u6216\u8005\u4f7f\u7528\u5176\u4ed6\u65b9\u5f0f\u6765\u4f20\u9012\u7c7b\u5bf9\u8c61\u7684\u5f15\u7528\u7ed9<code>std::function<\/code>\uff0c\u4ee5\u786e\u4fdd\u5bf9\u539f\u59cb\u5bf9\u8c61\u7684\u4fee\u6539\u53ef\u89c1\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u6f14\u793a\u4e86\u6309\u5f15\u7528\u4f20\u9012<code>this<\/code>\u6307\u9488\u4ee5\u4fee\u6539\u539f\u59cb\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>#include &lt;functional>\n#include &lt;iostream>\n\nclass MyClass {\npublic:\n    void modifyValue()\n    {\n        std::function&lt;void()> func = [this]() {\n            value = 20;  \/\/ \u4fee\u6539\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\n        };\n\n        func();  \/\/ \u8c03\u7528std::function\u5bf9\u8c61\n\n        std::cout &lt;&lt; value &lt;&lt; std::endl;  \/\/ \u8f93\u51fa 20\n    }\n\nprivate:\n    int value = 10;\n};\n\nint main()\n{\n    MyClass obj;\n    obj.modifyValue();\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u6309\u5f15\u7528\u6355\u83b7<code>this<\/code>\u6307\u9488\uff0clambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u8bbf\u95ee\u548c\u4fee\u6539\u539f\u59cb\u7684<code>MyClass<\/code>\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u4f60\u53ef\u4ee5\u786e\u4fdd\u5bf9\u539f\u59cb\u5bf9\u8c61\u7684\u4fee\u6539\u53ef\u89c1\u3002<\/p>\n\n\n\n<p><strong>S\uff1a<\/strong>\u6309\u503c\u4f20\u9012\u4e00\u4e2astd::function\u5bf9\u8c61\uff0c\u5e76\u4e14\u6309\u503c\u6355\u83b7class\u7684this\u6307\u9488\uff0c\u5bfc\u81f4\u5b83\u521b\u5efa\u4e00\u4e2a\u65b0\u7684class\u5b9e\u4f8b\u65f6\uff0c\u662f\u5426\u4e0d\u4f1a\u8c03\u7528Class\u7684\u6784\u9020\u51fd\u6570\uff1f\u6211\u5728Class\u7684\u6784\u9020\u51fd\u6570\u4e2d\u6dfb\u52a0\u8f93\u51fa\u8bed\u53e5\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u5f97\u5230\u6211\u9884\u671f\u4e2d\u7684\u8f93\u51fa\u3002<\/p>\n\n\n\n<p><strong>ChatGPT\uff1a<\/strong>\u5f53\u6309\u503c\u4f20\u9012<code>std::function<\/code>\u5bf9\u8c61\u5e76\u6309\u503c\u6355\u83b7\u7c7b\u7684<code>this<\/code>\u6307\u9488\u65f6\uff0c\u5e76\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u7c7b\u5b9e\u4f8b\uff0c\u56e0\u6b64\u4e0d\u4f1a\u8c03\u7528\u7c7b\u7684\u6784\u9020\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0clambda\u8868\u8fbe\u5f0f\u53ea\u4f1a\u590d\u5236\u6355\u83b7\u7684\u7c7b\u5b9e\u4f8b\uff0c\u5e76\u5c06\u590d\u5236\u7684\u526f\u672c\u5b58\u50a8\u5728<code>std::function<\/code>\u5bf9\u8c61\u4e2d\u3002\u8fd9\u610f\u5473\u7740\u590d\u5236\u7684\u526f\u672c\u5df2\u7ecf\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u7c7b\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u901a\u8fc7\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u65b0\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5982\u679c\u4f60\u5728\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e2d\u6dfb\u52a0\u4e86\u8f93\u51fa\u8bed\u53e5\uff0c\u800c\u5728\u6309\u503c\u6355\u83b7\u7684lambda\u8868\u8fbe\u5f0f\u4e2d\u6ca1\u6709\u89e6\u53d1\u6784\u9020\u51fd\u6570\u7684\u8c03\u7528\uff0c\u53ef\u80fd\u662f\u56e0\u4e3a\u590d\u5236\u7684\u526f\u672c\u5df2\u7ecf\u5b58\u5728\uff0c\u5e76\u4e14\u4e0d\u9700\u8981\u8c03\u7528\u6784\u9020\u51fd\u6570\u6765\u521b\u5efa\u65b0\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u6f14\u793a\u4e86\u6309\u503c\u4f20\u9012<code>std::function<\/code>\u5bf9\u8c61\u5e76\u6309\u503c\u6355\u83b7<code>this<\/code>\u6307\u9488\u65f6\uff0c\u5e76\u6ca1\u6709\u8c03\u7528\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>#include &lt;functional>\n#include &lt;iostream>\n\nclass MyClass {\npublic:\n    MyClass()\n    {\n        std::cout &lt;&lt; \"Constructor called\" &lt;&lt; std::endl;\n    }\n\n    void modifyValue()\n    {\n        std::function&lt;void()> func = [*this]() {\n            value = 20;  \/\/ \u4fee\u6539\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\n        };\n\n        func();  \/\/ \u8c03\u7528std::function\u5bf9\u8c61\n\n        std::cout &lt;&lt; value &lt;&lt; std::endl;  \/\/ \u8f93\u51fa 20\n    }\n\nprivate:\n    int value = 10;\n};\n\nint main()\n{\n    MyClass obj;\n    obj.modifyValue();\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u5f53\u521b\u5efa<code>MyClass<\/code>\u5bf9\u8c61\u65f6\uff0c\u4f1a\u8c03\u7528\u6784\u9020\u51fd\u6570\u5e76\u8f93\u51fa&#8221;Constructor called&#8221;\u3002\u7136\u540e\uff0c\u5728<code>modifyValue<\/code>\u51fd\u6570\u4e2d\u6309\u503c\u4f20\u9012<code>std::function<\/code>\u5bf9\u8c61\u5e76\u6309\u503c\u6355\u83b7<code>this<\/code>\u6307\u9488\u65f6\uff0c\u5e76\u6ca1\u6709\u518d\u6b21\u8c03\u7528\u6784\u9020\u51fd\u6570\uff0c\u56e0\u4e3a\u590d\u5236\u7684\u526f\u672c\u5df2\u7ecf\u5b58\u5728\u3002<\/p>\n\n\n\n<p>\u8bf7\u786e\u4fdd\u4f60\u5728\u6b63\u786e\u7684\u4f4d\u7f6e\u6dfb\u52a0\u4e86\u8f93\u51fa\u8bed\u53e5\uff0c\u4ee5\u4fbf\u5728\u6784\u9020\u51fd\u6570\u88ab\u8c03\u7528\u65f6\u80fd\u591f\u770b\u5230\u8f93\u51fa\u3002<\/p>\n\n\n\n<p><strong>S\uff1a<\/strong>\u6211\u5728lambda\u8868\u8fbe\u5f0f\u4e2d\u76f4\u63a5\u4f7f\u7528=\u6355\u83b7\u6240\u6709\u5bf9\u8c61\uff0c\u5305\u62ecthis\u6307\u9488\u3002\u4f46\u662f\u5728lambda\u5185\u90e8\u4fee\u6539class\u4e2d\u7684\u975e\u9759\u6001\u6210\u5458\u51fd\u6570\uff0c\u5bf9\u4e8e\u521b\u5efa\u8fd9\u4e2alambda\u7684\u5bf9\u8c61\u6765\u8bf4\u4e0d\u53ef\u89c1\uff0cclass\u7684\u6784\u9020\u51fd\u6570\u5e76\u6ca1\u6709\u88ab\u8c03\u7528\uff0c\u6240\u4ee5\u5e76\u6ca1\u6709\u65b0\u5efa\u5b9e\u4f8b\u3002\u90a3\u4e48\u53ef\u80fd\u7684\u539f\u56e0\u662f\u5426\u662f\uff0c\u4f7f\u7528=\u6765\u6355\u83b7\u5bf9\u8c61\uff0c\u5c06class\u4e2d\u539f\u672c\u7684\u5bf9\u8c61\uff0c\u548cthis\u6307\u9488\u4e00\u5e76\u6309\u503c\u6355\u83b7\u4e86\u3002\u7136\u540e\u7531\u4e8e\u6211\u53ea\u5199\u4e86\u53d8\u91cf\u540d\uff0c\u800c\u4e0d\u662f\u4f7f\u7528this->\u6765\u8bbf\u95ee\u6210\u5458\u53d8\u91cf\uff0c\u5bfc\u81f4\u4fee\u6539\u7684\u662f\u6309\u503c\u6355\u83b7\u4e2d\u590d\u5236\u7684\u6570\u636e\uff0c\u800c\u4e0d\u662fclass\u5bf9\u8c61\u4e2d\u7684\u6210\u5458\u53d8\u91cf\uff1f<\/p>\n\n\n\n<p><strong>ChatGPT\uff1a<\/strong>\u662f\u7684\uff0c\u4f60\u7684\u7406\u89e3\u662f\u6b63\u786e\u7684\u3002\u5f53\u4f60\u5728lambda\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528<code>=``\u6355\u83b7\u6240\u6709\u5bf9\u8c61\uff0c\u5305\u62ec<\/code>this<code>\u6307\u9488\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u6309\u503c\u6355\u83b7\u4e86\u6240\u6709\u7684\u5bf9\u8c61\uff0c\u5e76\u4e14\u590d\u5236\u4e86\u5b83\u4eec\u7684\u526f\u672c\u3002\u8fd9\u5305\u62ec\u4e86\u7c7b\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u548c<\/code>this`\u6307\u9488\u3002<\/p>\n\n\n\n<p>\u5728lambda\u5185\u90e8\u4fee\u6539\u7c7b\u7684\u975e\u9759\u6001\u6210\u5458\u65f6\uff0c\u5982\u679c\u4f60\u53ea\u662f\u4f7f\u7528\u53d8\u91cf\u540d\u8bbf\u95ee\u6210\u5458\u53d8\u91cf\uff0c\u800c\u6ca1\u6709\u4f7f\u7528<code>this-&gt;<\/code>\u6765\u660e\u786e\u6307\u5b9a\u8bbf\u95ee\u7684\u662f\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff0c\u90a3\u4e48\u5b9e\u9645\u4e0a\u4fee\u6539\u7684\u662f\u6309\u503c\u6355\u83b7\u4e2d\u590d\u5236\u7684\u6570\u636e\uff0c\u800c\u4e0d\u662f\u539f\u59cb\u7684\u7c7b\u5bf9\u8c61\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>\u8fd9\u662f\u56e0\u4e3a\u5728lambda\u8868\u8fbe\u5f0f\u4e2d\uff0c\u6210\u5458\u53d8\u91cf\u88ab\u590d\u5236\u5230\u4e86lambda\u7684\u526f\u672c\u4e2d\uff0c\u5e76\u4e14\u5728lambda\u5185\u90e8\u88ab\u89c6\u4e3a\u5c40\u90e8\u53d8\u91cf\u3002\u56e0\u6b64\uff0c\u5982\u679c\u4f60\u60f3\u4fee\u6539\u539f\u59cb\u7684\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff0c\u9700\u8981\u4f7f\u7528<code>this-&gt;<\/code>\u6765\u660e\u786e\u6307\u5b9a\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u6f14\u793a\u4e86\u5728lambda\u5185\u90e8\u4f7f\u7528<code>=``\u6355\u83b7this<\/code>\u6307\u9488\u540e\uff0c\u5982\u4f55\u4f7f\u7528<code>this-&gt;<\/code>\u6765\u4fee\u6539\u539f\u59cb\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>#include &lt;iostream>\n\nclass MyClass {\npublic:\n    void modifyValue()\n    {\n        auto lambda = [=]() {\n            this->value = 20;  \/\/ \u4f7f\u7528this->\u660e\u786e\u6307\u5b9a\u4fee\u6539\u539f\u59cb\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\n        };\n\n        lambda();\n\n        std::cout &lt;&lt; value &lt;&lt; std::endl;  \/\/ \u8f93\u51fa 20\n    }\n\nprivate:\n    int value = 10;\n};\n\nint main()\n{\n    MyClass obj;\n    obj.modifyValue();\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u4f7f\u7528<code>=``\u6355\u83b7this<\/code>\u6307\u9488\u540e\uff0c\u5728lambda\u5185\u90e8\u4f7f\u7528<code>this-&gt;<\/code>\u6765\u8bbf\u95ee\u548c\u4fee\u6539\u539f\u59cb\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u3002\u8fd9\u6837\uff0c\u4fee\u6539\u7684\u5c31\u662f\u539f\u59cb\u7c7b\u5bf9\u8c61\u4e2d\u7684\u6210\u5458\u53d8\u91cf\uff0c\u800c\u4e0d\u662flambda\u7684\u526f\u672c\u3002<\/p>\n\n\n\n<p>\u786e\u4fdd\u5728lambda\u5185\u90e8\u660e\u786e\u6307\u5b9a\u8bbf\u95ee\u7684\u662f\u7c7b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff0c\u800c\u4e0d\u662flambda\u7684\u5c40\u90e8\u53d8\u91cf\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c1d\u8bd5\u590d\u73b0<\/h2>\n\n\n\n<p>\u5c1d\u8bd5\u590d\u73b0\u5931\u8d25\u4e86\uff0c\u6211\u5728\u62f7\u8d1d\u7684lambda\u4e2d\u4fee\u6539object\u5185\u7684\u6210\u5458\u53d8\u91cf\uff0c\u4f46\u662f\u5bf9class\u4e2d\u53ef\u89c1\u3002\u6211\u89c9\u5f97\u8fd9\u5e94\u8be5\u662f\u4e00\u4e2a\u7f16\u8bd1\u5668\u7684Bug\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C++\u4e00\u4e2a\u5751\u3002\u5982\u679c\u76f4\u63a5\u6309\u503c\u6355\u83b7\u5916\u90e8\u5bf9\u8c61\uff0c\u90a3\u4e48\u5728lambda\u5185\u90e8\u4fee\u6539\u5b83\uff0c\u4f1a\u88ab\u89c6\u4e3a\u8bed\u6cd5\u9519\u8bef\uff0c\u4e0d\u80fd\u901a\u8fc7\u7f16\u8bd1\u3002\u4f46\u662f\u5728C [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-68","post","type-post","status-publish","format-standard","hentry","category-3"],"_links":{"self":[{"href":"https:\/\/code.lingapi.top\/index.php?rest_route=\/wp\/v2\/posts\/68","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/code.lingapi.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/code.lingapi.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/code.lingapi.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/code.lingapi.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=68"}],"version-history":[{"count":8,"href":"https:\/\/code.lingapi.top\/index.php?rest_route=\/wp\/v2\/posts\/68\/revisions"}],"predecessor-version":[{"id":76,"href":"https:\/\/code.lingapi.top\/index.php?rest_route=\/wp\/v2\/posts\/68\/revisions\/76"}],"wp:attachment":[{"href":"https:\/\/code.lingapi.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=68"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/code.lingapi.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=68"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/code.lingapi.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=68"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}