{"id":1722,"date":"2022-06-13T10:38:23","date_gmt":"2022-06-13T02:38:23","guid":{"rendered":"http:\/\/www.lijiapeng.cn\/?p=1722"},"modified":"2023-02-06T11:43:03","modified_gmt":"2023-02-06T03:43:03","slug":"c-summarize","status":"publish","type":"post","link":"https:\/\/bestcoder.cn\/c-summarize","title":{"rendered":"C++\u603b\u7ed3"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_72 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\"><\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" 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ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E9%AB%98%E7%BA%A7%E7%89%B9%E6%80%A7\" title=\"\u9ad8\u7ea7\u7279\u6027\">\u9ad8\u7ea7\u7279\u6027<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E5%BA%93\" title=\"\u5e93\">\u5e93<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E6%B5%8F%E8%A7%88%E5%99%A8%E5%8E%9F%E7%90%86\" title=\"\u6d4f\u89c8\u5668\u539f\u7406\">\u6d4f\u89c8\u5668\u539f\u7406<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E8%BF%9B%E7%A8%8B%E9%80%9A%E4%BF%A1\" title=\"\u8fdb\u7a0b\u901a\u4fe1\">\u8fdb\u7a0b\u901a\u4fe1<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BF%9B%E7%A8%8B\" title=\"\u6d4f\u89c8\u5668\u8fdb\u7a0b\">\u6d4f\u89c8\u5668\u8fdb\u7a0b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E9%80%9A%E4%BF%A1\" title=\"\u901a\u4fe1\">\u901a\u4fe1<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E4%BA%A4%E4%BA%92%E6%B5%81%E7%A8%8B\" title=\"\u4ea4\u4e92\u6d41\u7a0b\">\u4ea4\u4e92\u6d41\u7a0b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E5%AD%98%E5%82%A8\" title=\"\u5b58\u50a8\">\u5b58\u50a8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/bestcoder.cn\/c-summarize\/#%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93\" title=\"\u77e5\u8bc6\u70b9\u603b\u7ed3\">\u77e5\u8bc6\u70b9\u603b\u7ed3<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84\"><\/span>\u6570\u636e\u7ed3\u6784<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%99%BA%E8%83%BD%E6%8C%87%E9%92%88\"><\/span>\u667a\u80fd\u6307\u9488<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u2460 unique_ptr\u6307\u9488\uff1a\u5bf9\u4e8e\u4e00\u4e2a\u6307\u5411\u5f00\u8f9f\u5728\u5806\u533a\u5185\u5b58\u7684\u6307\u9488\uff0c\u5728\u6574\u4e2a\u6307\u9488<a href=\"https:\/\/so.csdn.net\/so\/search?q=%E4%BD%9C%E7%94%A8%E5%9F%9F&amp;spm=1001.2101.3001.7020\" target=\"_blank\" rel=\"noreferrer noopener\">\u4f5c\u7528\u57df<\/a>\u4e2d\u6307\u5411\u8fd9\u7247\u5185\u5b58\u533a\u57df\u7684\u6307\u9488\u53ea\u80fd\u662f\u4ed6\u81ea\u5df1\uff0c\u8c01\u8981\u8ddf\u5b83\u62a2\u593a\u63a7\u5236\u6743\uff0c\u7f16\u8bd1\u5668\u5c31\u4f1a\u76f4\u63a5\u62a5\u9519\uff1b<\/p>\n\n\n\n<p>\u2461 shared_ptr\u6307\u9488\uff1a\u5bf9\u4e8e\u5f00\u8f9f\u5728\u5806\u533a\u7684\u5185\u5b58\uff0c\u6211\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u6307\u9488\u6307\u5411\u5b83\uff0c\u5c31\u76f8\u5f53\u4e8e\u6211\u5148\u5728\u5806\u533a\u5f00\u8f9f\u4e00\u5757\u5185\u5b58\u4f7f\u7528\u4e00\u4e2a\u6307\u9488\u6307\u5411\u8fd9\u7247\u5185\u5b58\u533a\u57df\uff0c\u7136\u540e\u7ed9\u8fd9\u4e2a\u6307\u9488\u53d6\u5f88<strong>\u591a\u4e2a\u522b\u540d<\/strong>\uff1b<\/p>\n\n\n\n<p>\u2463 weak_ptr\u6307\u9488\uff1a\u7528\u4e8e\u89e3\u51b3\u4f7f\u7528\u201c\u5faa\u73af\u5f15\u7528\u201d\u7684\u95ee\u9898\u65f6\uff0c\u4f7f\u7528weak_ptr\u800c\u975eshared_ptr\uff0c\u4e0eshared_ptr\u4e0d\u540c\uff0cweak_ptr\u662f\u5f31\u5171\u4eab\u6307\u9488\uff0c\u5f53\u4e00\u4e2ashared_ptr\u6307\u9488\u8d4b\u503c\u7ed9weak_ptr\u6307\u9488\u65f6\uff0c\u5f15\u7528\u8ba1\u6570\u4e0d\u4f1a\u6539\u53d8\u3002<\/p>\n\n\n\n<p>mojom\u7ba1\u9053 \u5148\u5b9a\u4e49\u6570\u636e\u7ed3\u6784\u548c\u63a5\u53e3\uff0c\u7136\u540e\u5f15\u7528\u5934\u6587\u4ef6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B5%8B%E8%AF%95\"><\/span>\u6d4b\u8bd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AF%AD%E8%A8%80%E7%89%B9%E6%80%A7\"><\/span>\u8bed\u8a00\u7279\u6027<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5f3a\u7c7b\u578b<\/p>\n\n\n\n<p>\u53d8\u91cf\u90fd\u662f\u8981std::move\u590d\u7528\u7684<\/p>\n\n\n\n<p>\u4f5c\u7528\u57df<\/p>\n\n\n\n<p>\u5934\u6587\u4ef6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"callback\"><\/span>callback<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>FuncA() \u8c03\u7528 FuncB(param, Base::BindOnce(&amp;FuncACallback()))<\/li>\n\n\n\n<li>FuncACallback() \u5bf9\u8fd4\u56de\u7684\u53c2\u6570\u505a\u5177\u4f53\u7684\u5904\u7406<\/li>\n\n\n\n<li>using xxCallback = base::OnceCallback&lt;void(a,b)&gt;<\/li>\n\n\n\n<li>move().Run()<\/li>\n\n\n\n<li>Func2(paramx , &amp;Base::BindOnce(&amp;Func3,param1,param2,std::move(callback)))<\/li>\n\n\n\n<li>callback.Run(param3,param4);<\/li>\n\n\n\n<li>Func3(param1,param2,param3,param4)<\/li>\n<\/ol>\n\n\n\n<p>\u672c\u8d28\uff1a\u51fd\u6570\u6307\u9488<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%AB%98%E7%BA%A7%E7%89%B9%E6%80%A7\"><\/span>\u9ad8\u7ea7\u7279\u6027<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%BA%93\"><\/span>\u5e93<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>boost v8 base absl<\/p>\n\n\n\n<p>base::Value<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B5%8F%E8%A7%88%E5%99%A8%E5%8E%9F%E7%90%86\"><\/span>\u6d4f\u89c8\u5668\u539f\u7406<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u6ce8\u5165<\/p>\n\n\n\n<p>ETH\u6ce8\u5165\uff0cDidCreateScriptContext\uff0cAddJavaScriptObjectToFrame\uff0cBindFunctionsToObject \u7ed1\u5b9aV8\u5bf9\u8c61\uff0c\u6ce8\u5165\u540e\u624d\u80fd\u5728\u63a7\u5236\u53f0\u8c03\u7528\u65b9\u6cd5<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%BF%9B%E7%A8%8B%E9%80%9A%E4%BF%A1\"><\/span>\u8fdb\u7a0b\u901a\u4fe1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BF%9B%E7%A8%8B\"><\/span>\u6d4f\u89c8\u5668\u8fdb\u7a0b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>render process<\/p>\n\n\n\n<p>browser process<\/p>\n\n\n\n<p>utility process<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%80%9A%E4%BF%A1\"><\/span>\u901a\u4fe1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6d4f\u89c8\u5668\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u4e0d\u50cfhttp\u8bf7\u6c42\uff0c\u662f\u987a\u5e8f\u6267\u884c\u7684\u3002\u800c\u662f\u4f34\u968f\u6d4f\u89c8\u5668\u957f\u671f\u5b58\u5728\u3002\u5728\u6d4f\u89c8\u5668\u505a\u4e0d\u540c\u7684\u64cd\u4f5c\u4f1a\u6267\u884c\u4e0d\u540c\u8fdb\u7a0b\u7684\u51fd\u6570\u3002<\/p>\n\n\n\n<p>mojom\u548cidl<\/p>\n\n\n\n<p>mojom\u901a\u4fe1\u63a5\u53e3\u4e0d\u80fd\u4f20null\uff0c\u5426\u5219\u4f1acrash<\/p>\n\n\n\n<p>x.reset \u91cd\u7f6e\u53d8\u91cf\u751f\u547d\u5468\u671f<\/p>\n\n\n\n<p>mojo::Remote \u53d1\u9001\u7aef<\/p>\n\n\n\n<p>mojo::Receive \u63a5\u6536\u7aef<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BA%A4%E4%BA%92%E6%B5%81%E7%A8%8B\"><\/span>\u4ea4\u4e92\u6d41\u7a0b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%AD%98%E5%82%A8\"><\/span>\u5b58\u50a8<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>SQLite<\/p>\n\n\n\n<p>\u5185\u5b58\u53d8\u91cf \u4f1a\u8fc7\u671f<\/p>\n\n\n\n<p>TPM \u786c\u4ef6\u4fdd\u5b58 \u5b89\u5168\u6027\u9ad8<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u5176\u4ed6\u6587\u7ae0 <a href=\"http:\/\/www.lijiapeng.cn\/?p=1126\">\u70ae\u8f70C++<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93\"><\/span>\u77e5\u8bc6\u70b9\u603b\u7ed3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>7\u3001\u200b\u200b\u200b\u200b\u200b\u200b\u200bnew\u548cmalloc\u7684\u533a\u522b\uff1f<\/strong><\/p>\n\n\n\n<p>new\/delete\u662fC++\u5173\u952e\u5b57\uff0c\u9700\u8981\u7f16\u8bd1\u5668\u652f\u6301\u3002malloc\/free\u662f\u5e93\u51fd\u6570\uff0c\u9700\u8981\u5934\u6587\u4ef6\u652f\u6301\uff1b<\/p>\n\n\n\n<p>\u4f7f\u7528new\u64cd\u4f5c\u7b26\u7533\u8bf7\u5185\u5b58\u5206\u914d\u65f6\u65e0\u987b\u6307\u5b9a\u5185\u5b58\u5757\u7684\u5927\u5c0f\uff0c\u7f16\u8bd1\u5668\u4f1a\u6839\u636e\u7c7b\u578b\u4fe1\u606f\u81ea\u884c\u8ba1\u7b97\u3002\u800cmalloc\u5219\u9700\u8981\u663e\u5f0f\u5730\u6307\u51fa\u6240\u9700\u5185\u5b58\u7684\u5c3a\u5bf8\u3002<\/p>\n\n\n\n<p>new\u64cd\u4f5c\u7b26\u5185\u5b58\u5206\u914d\u6210\u529f\u65f6\uff0c\u8fd4\u56de\u7684\u662f\u5bf9\u8c61\u7c7b\u578b\u7684\u6307\u9488\uff0c\u7c7b\u578b\u4e25\u683c\u4e0e\u5bf9\u8c61\u5339\u914d\uff0c\u65e0\u987b\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\uff0c\u6545new\u662f\u7b26\u5408\u7c7b\u578b\u5b89\u5168\u6027\u7684\u64cd\u4f5c\u7b26\u3002\u800cmalloc\u5185\u5b58\u5206\u914d\u6210\u529f\u5219\u662f\u8fd4\u56devoid * \uff0c\u9700\u8981\u901a\u8fc7\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u5c06void*\u6307\u9488\u8f6c\u6362\u6210\u6211\u4eec\u9700\u8981\u7684\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>new\u5185\u5b58\u5206\u914d\u5931\u8d25\u65f6\uff0c\u4f1a\u629b\u51fabac_alloc\u5f02\u5e38\u3002malloc\u5206\u914d\u5185\u5b58\u5931\u8d25\u65f6\u8fd4\u56deNULL\u3002<\/p>\n\n\n\n<p>new\u4f1a\u5148\u8c03\u7528operator new\u51fd\u6570\uff0c\u7533\u8bf7\u8db3\u591f\u7684\u5185\u5b58\uff08\u901a\u5e38\u5e95\u5c42\u4f7f\u7528malloc\u5b9e\u73b0\uff09\u3002\u7136\u540e\u8c03\u7528\u7c7b\u578b\u7684\u6784\u9020\u51fd\u6570\uff0c\u521d\u59cb\u5316\u6210\u5458\u53d8\u91cf\uff0c\u6700\u540e\u8fd4\u56de\u81ea\u5b9a\u4e49\u7c7b\u578b\u6307\u9488\u3002delete\u5148\u8c03\u7528\u6790\u6784\u51fd\u6570\uff0c\u7136\u540e\u8c03\u7528operator delete\u51fd\u6570\u91ca\u653e\u5185\u5b58\uff08\u901a\u5e38\u5e95\u5c42\u4f7f\u7528free\u5b9e\u73b0\uff09\u3002malloc\/free\u662f\u5e93\u51fd\u6570\uff0c\u53ea\u80fd\u52a8\u6001\u7684\u7533\u8bf7\u548c\u91ca\u653e\u5185\u5b58\uff0c\u65e0\u6cd5\u5f3a\u5236\u8981\u6c42\u5176\u505a\u81ea\u5b9a\u4e49\u7c7b\u578b\u5bf9\u8c61\u6784\u9020\u548c\u6790\u6784\u5de5\u4f5c\u3002<\/p>\n\n\n\n<p><strong>8\u3001\u200b\u200b\u200b\u200b\u200b\u200b\u200bnew\u548cdelete\u7684\u5b9e\u73b0\u539f\u7406\uff0c delete\u662f\u5982\u4f55\u77e5\u9053\u91ca\u653e\u5185\u5b58\u7684\u5927\u5c0f\u7684\uff1f<\/strong><\/p>\n\n\n\n<p>new\u7b80\u5355\u7c7b\u578b\u76f4\u63a5\u8c03\u7528operator new\u5206\u914d\u5185\u5b58\uff1b\u800c\u5bf9\u4e8e\u590d\u6742\u7ed3\u6784\uff0c\u5148\u8c03\u7528operator new\u5206\u914d\u5185\u5b58\uff0c\u7136\u540e\u5728\u5206\u914d\u7684\u5185\u5b58\u4e0a\u8c03\u7528\u6784\u9020\u51fd\u6570\uff1b\u5bf9\u4e8e\u7b80\u5355\u7c7b\u578b\uff0cnew[]\u8ba1\u7b97\u597d\u5927\u5c0f\u540e\u8c03\u7528operator new\uff1b\u5bf9\u4e8e\u590d\u6742\u6570\u636e\u7ed3\u6784\uff0cnew[]\u5148\u8c03\u7528operator new[]\u5206\u914d\u5185\u5b58\uff0c\u7136\u540e\u5728p\u7684\u524d\u56db\u4e2a\u5b57\u8282\u5199\u5165\u6570\u7ec4\u5927\u5c0fn\uff0c\u7136\u540e\u8c03\u7528n\u6b21\u6784\u9020\u51fd\u6570\uff0c\u9488\u5bf9\u590d\u6742\u7c7b\u578b\uff0cnew[]\u4f1a\u989d\u5916\u5b58\u50a8\u6570\u7ec4\u5927\u5c0f\uff1b<\/p>\n\n\n\n<p>new\u8868\u8fbe\u5f0f\u8c03\u7528\u4e00\u4e2a\u540d\u4e3aoperator new(operator new[])\u51fd\u6570\uff0c\u5206\u914d\u4e00\u5757\u8db3\u591f\u5927\u7684\u3001\u539f\u59cb\u7684\u3001\u672a\u547d\u540d\u7684\u5185\u5b58\u7a7a\u95f4\uff1b<\/p>\n\n\n\n<p>\u7f16\u8bd1\u5668\u8fd0\u884c\u76f8\u5e94\u7684\u6784\u9020\u51fd\u6570\u4ee5\u6784\u9020\u8fd9\u4e9b\u5bf9\u8c61\uff0c\u5e76\u4e3a\u5176\u4f20\u5165\u521d\u59cb\u503c\uff1b<\/p>\n\n\n\n<p>\u5bf9\u8c61\u88ab\u5206\u914d\u4e86\u7a7a\u95f4\u5e76\u6784\u9020\u5b8c\u6210\uff0c\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u8be5\u5bf9\u8c61\u7684\u6307\u9488\u3002<\/p>\n\n\n\n<p>delete\u7b80\u5355\u6570\u636e\u7c7b\u578b\u9ed8\u8ba4\u53ea\u662f\u8c03\u7528free\u51fd\u6570\uff1b\u590d\u6742\u6570\u636e\u7c7b\u578b\u5148\u8c03\u7528\u6790\u6784\u51fd\u6570\u518d\u8c03\u7528operator delete\uff1b\u9488\u5bf9\u7b80\u5355\u7c7b\u578b\uff0cdelete\u548cdelete[]\u7b49\u540c\u3002\u5047\u8bbe\u6307\u9488p\u6307\u5411new[]\u5206\u914d\u7684\u5185\u5b58\u3002\u56e0\u4e3a\u89814\u5b57\u8282\u5b58\u50a8\u6570\u7ec4\u5927\u5c0f\uff0c\u5b9e\u9645\u5206\u914d\u7684\u5185\u5b58\u5730\u5740\u4e3a[p-4]\uff0c\u7cfb\u7edf\u8bb0\u5f55\u7684\u4e5f\u662f\u8fd9\u4e2a\u5730\u5740\u3002delete[]\u5b9e\u9645\u91ca\u653e\u7684\u5c31\u662fp-4\u6307\u5411\u7684\u5185\u5b58\u3002\u800cdelete\u4f1a\u76f4\u63a5\u91ca\u653ep\u6307\u5411\u7684\u5185\u5b58\uff0c\u8fd9\u4e2a\u5185\u5b58\u6839\u672c\u6ca1\u6709\u88ab\u7cfb\u7edf\u8bb0\u5f55\uff0c\u6240\u4ee5\u4f1a\u5d29\u6e83\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u5728 new [] \u4e00\u4e2a\u5bf9\u8c61\u6570\u7ec4\u65f6\uff0c\u9700\u8981\u4fdd\u5b58\u6570\u7ec4\u7684\u7ef4\u5ea6\uff0cC++ \u7684\u505a\u6cd5\u662f\u5728\u5206\u914d\u6570\u7ec4\u7a7a\u95f4\u65f6\u591a\u5206\u914d\u4e86 4 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\u65f6\u5c31\u53ef\u4ee5\u53d6\u51fa\u8fd9\u4e2a\u4fdd\u5b58\u7684\u6570\uff0c\u5c31\u77e5\u9053\u4e86\u9700\u8981\u8c03\u7528\u6790\u6784\u51fd\u6570\u591a\u5c11\u6b21\u4e86\u3002<\/p>\n\n\n\n<p><strong>\u200b\u200b\u200b\u200b\u200b\u200b\u200b9\u3001malloc\u4e0efree\u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/strong><\/p>\n\n\n\n<p>\u5728\u6807\u51c6C\u5e93\u4e2d\uff0c\u63d0\u4f9b\u4e86malloc\/free\u51fd\u6570\u5206\u914d\u91ca\u653e\u5185\u5b58\uff0c\u8fd9\u4e24\u4e2a\u51fd\u6570\u5e95\u5c42\u662f\u7531brk\u3001mmap\u3001\uff0cmunmap\u8fd9\u4e9b\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0\u7684;<\/p>\n\n\n\n<p>brk\u662f\u5c06\u6570\u636e\u6bb5(.data)\u7684\u6700\u9ad8\u5730\u5740\u6307\u9488_edata\u5f80\u9ad8\u5730\u5740\u63a8,mmap\u662f\u5728\u8fdb\u7a0b\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4\u4e2d\uff08\u5806\u548c\u6808\u4e2d\u95f4\uff0c\u79f0\u4e3a\u6587\u4ef6\u6620\u5c04\u533a\u57df\u7684\u5730\u65b9\uff09\u627e\u4e00\u5757\u7a7a\u95f2\u7684\u865a\u62df\u5185\u5b58\u3002\u8fd9\u4e24\u79cd\u65b9\u5f0f\u5206\u914d\u7684\u90fd\u662f\u865a\u62df\u5185\u5b58\uff0c\u6ca1\u6709\u5206\u914d\u7269\u7406\u5185\u5b58\u3002\u5728\u7b2c\u4e00\u6b21\u8bbf\u95ee\u5df2\u5206\u914d\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4\u7684\u65f6\u5019\uff0c\u53d1\u751f\u7f3a\u9875\u4e2d\u65ad\uff0c\u64cd\u4f5c\u7cfb\u7edf\u8d1f\u8d23\u5206\u914d\u7269\u7406\u5185\u5b58\uff0c\u7136\u540e\u5efa\u7acb\u865a\u62df\u5185\u5b58\u548c\u7269\u7406\u5185\u5b58\u4e4b\u95f4\u7684\u6620\u5c04\u5173\u7cfb\uff1b<\/p>\n\n\n\n<p>malloc\u5c0f\u4e8e128k\u7684\u5185\u5b58\uff0c\u4f7f\u7528brk\u5206\u914d\u5185\u5b58\uff0c\u5c06_edata\u5f80\u9ad8\u5730\u5740\u63a8\uff1bmalloc\u5927\u4e8e128k\u7684\u5185\u5b58\uff0c\u4f7f\u7528mmap\u5206\u914d\u5185\u5b58\uff0c\u5728\u5806\u548c\u6808\u4e4b\u95f4\u627e\u4e00\u5757\u7a7a\u95f2\u5185\u5b58\u5206\u914d\uff1bbrk\u5206\u914d\u7684\u5185\u5b58\u9700\u8981\u7b49\u5230\u9ad8\u5730\u5740\u5185\u5b58\u91ca\u653e\u4ee5\u540e\u624d\u80fd\u91ca\u653e\uff0c\u800cmmap\u5206\u914d\u7684\u5185\u5b58\u53ef\u4ee5\u5355\u72ec\u91ca\u653e\u3002\u5f53\u6700\u9ad8\u5730\u5740\u7a7a\u95f4\u7684\u7a7a\u95f2\u5185\u5b58\u8d85\u8fc7128K\uff08\u53ef\u7531M_TRIM_THRESHOLD\u9009\u9879\u8c03\u8282\uff09\u65f6\uff0c\u6267\u884c\u5185\u5b58\u7d27\u7f29\u64cd\u4f5c\uff08trim\uff09\u3002\u5728\u4e0a\u4e00\u4e2a\u6b65\u9aa4free\u7684\u65f6\u5019\uff0c\u53d1\u73b0\u6700\u9ad8\u5730\u5740\u7a7a\u95f2\u5185\u5b58\u8d85\u8fc7128K\uff0c\u4e8e\u662f\u5185\u5b58\u7d27\u7f29\u3002<\/p>\n\n\n\n<p>malloc\u662f\u4ece\u5806\u91cc\u9762\u7533\u8bf7\u5185\u5b58\uff0c\u4e5f\u5c31\u662f\u8bf4\u51fd\u6570\u8fd4\u56de\u7684\u6307\u9488\u662f\u6307\u5411\u5806\u91cc\u9762\u7684\u4e00\u5757\u5185\u5b58\u3002\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u6709\u4e00\u4e2a\u8bb0\u5f55\u7a7a\u95f2\u5185\u5b58\u5730\u5740\u7684\u94fe\u8868\u3002\u5f53\u64cd\u4f5c\u7cfb\u7edf\u6536\u5230\u7a0b\u5e8f\u7684\u7533\u8bf7\u65f6\uff0c\u5c31\u4f1a\u904d\u5386\u8be5\u94fe\u8868\uff0c\u7136\u540e\u5c31\u5bfb\u627e\u7b2c\u4e00\u4e2a\u7a7a\u95f4\u5927\u4e8e\u6240\u7533\u8bf7\u7a7a\u95f4\u7684\u5806\u7ed3\u70b9\uff0c\u7136\u540e\u5c31\u5c06\u8be5\u7ed3\u70b9\u4ece\u7a7a\u95f2\u7ed3\u70b9\u94fe\u8868\u4e2d\u5220\u9664\uff0c\u5e76\u5c06\u8be5\u7ed3\u70b9\u7684\u7a7a\u95f4\u5206\u914d\u7ed9\u7a0b\u5e8f<\/p>\n\n\n\n<p><strong>\u200b\u200b\u200b\u200b\u200b\u200b\u200b10\u3001malloc\u7533\u8bf7\u7684\u5b58\u50a8\u7a7a\u95f4\u80fd\u7528delete\u91ca\u653e\u5417\uff1f<\/strong><\/p>\n\n\n\n<p>\u4e0d\u80fd\uff0cmalloc \/free\u4e3b\u8981\u4e3a\u4e86\u517c\u5bb9C\uff0cnew\u548cdelete \u5b8c\u5168\u53ef\u4ee5\u53d6\u4ee3malloc \/free\u7684\u3002malloc \/free\u7684\u64cd\u4f5c\u5bf9\u8c61\u90fd\u662f\u5fc5\u987b\u660e\u786e\u5927\u5c0f\u7684\u3002\u800c\u4e14\u4e0d\u80fd\u7528\u5728\u52a8\u6001\u7c7b\u4e0a\u3002new \u548cdelete\u4f1a\u81ea\u52a8\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\u548c\u5927\u5c0f\uff0cmalloc\/free\u4e0d\u80fd\u6267\u884c\u6784\u9020\u51fd\u6570\u4e0e\u6790\u6784\u51fd\u6570\uff0c\u6240\u4ee5\u52a8\u6001\u5bf9\u8c61\u5b83\u662f\u4e0d\u884c\u7684\u3002\u5f53\u7136\u4ece\u7406\u8bba\u4e0a\u8bf4\u4f7f\u7528malloc\u7533\u8bf7\u7684\u5185\u5b58\u662f\u53ef\u4ee5\u901a\u8fc7delete\u91ca\u653e\u7684\u3002\u4e0d\u8fc7\u4e00\u822c\u4e0d\u8fd9\u6837\u5199\u7684\u3002\u800c\u4e14\u4e5f\u4e0d\u80fd\u4fdd\u8bc1\u6bcf\u4e2aC++\u7684\u8fd0\u884c\u65f6\u90fd\u80fd\u6b63\u5e38\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7cbe\u901aC++<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"no","footnotes":""},"categories":[21,30],"tags":[],"class_list":["post-1722","post","type-post","status-publish","format-standard","hentry","category-computer","category-30"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C++\u603b\u7ed3 - \u9876\u5c16\u7814\u53d1<\/title>\n<meta name=\"description\" content=\"C++\u603b\u7ed3 \u7cbe\u901aC++ - \u8ba1\u7b97\u673a, \u968f\u60f3  bestcoder\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bestcoder.cn\/c-summarize\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++\u603b\u7ed3 - \u9876\u5c16\u7814\u53d1\" \/>\n<meta property=\"og:description\" content=\"C++\u603b\u7ed3 \u7cbe\u901aC++ - \u8ba1\u7b97\u673a, \u968f\u60f3  bestcoder\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bestcoder.cn\/c-summarize\" \/>\n<meta property=\"og:site_name\" content=\"\u9876\u5c16\u7814\u53d1\" \/>\n<meta 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