{"id":36,"date":"2021-05-22T16:23:12","date_gmt":"2021-05-22T08:23:12","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=36"},"modified":"2021-05-22T21:29:41","modified_gmt":"2021-05-22T13:29:41","slug":"%e6%b7%b1%e5%85%a5c11%e7%ac%94%e8%ae%b0-%e7%ac%ac2%e7%ab%a0","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=36","title":{"rendered":"\u6df1\u5165\u5e94\u7528C++11\u7b14\u8bb0 \u7b2c2\u7ae0"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2cd5bf4979c\" class=\"ez-toc-cssicon-toggle-label\"><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\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2cd5bf4979c\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=36\/#%E4%BD%BF%E7%94%A8C11%E6%94%B9%E8%BF%9B%E7%A8%8B%E5%BA%8F%E6%80%A7%E8%83%BD\" >\u4f7f\u7528C++11\u6539\u8fdb\u7a0b\u5e8f\u6027\u80fd<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=36\/#%E5%8F%B3%E5%80%BC%E5%BC%95%E7%94%A8\" >\u53f3\u503c\u5f15\u7528<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=36\/#move%E8%AF%AD%E4%B9%89\" >move\u8bed\u4e49<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=36\/#forward%E5%92%8C%E5%AE%8C%E7%BE%8E%E8%BD%AC%E5%8F%91\" >forward\u548c\u5b8c\u7f8e\u8f6c\u53d1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=36\/#emplace_back%E5%87%8F%E5%B0%91%E5%86%85%E5%AD%98%E6%8B%B7%E8%B4%9D%E5%92%8C%E7%A7%BB%E5%8A%A8\" >emplace_back\u51cf\u5c11\u5185\u5b58\u62f7\u8d1d\u548c\u79fb\u52a8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=36\/#%E6%97%A0%E5%BA%8F%E5%AE%B9%E5%99%A8\" >\u65e0\u5e8f\u5bb9\u5668<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8C11%E6%94%B9%E8%BF%9B%E7%A8%8B%E5%BA%8F%E6%80%A7%E8%83%BD\"><\/span>\u4f7f\u7528C++11\u6539\u8fdb\u7a0b\u5e8f\u6027\u80fd<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%B3%E5%80%BC%E5%BC%95%E7%94%A8\"><\/span>\u53f3\u503c\u5f15\u7528<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5de6\u503c\u662f\u6307\u8868\u8fbe\u5f0f\u7ed3\u675f\u540e\u4f9d\u7136\u5b58\u5728\u7684\u6301\u4e45\u5bf9\u8c61\uff0c\u53f3\u503c\u662f\u8868\u8fbe\u5f0f\u7ed3\u675f\u65f6\u5c31\u4e0d\u518d\u5b58\u5728\u7684\u4e34\u65f6\u5bf9\u8c61\u3002\u53ef\u4ee5\u901a\u8fc7\u80fd\u5426\u5bf9\u8868\u8fbe\u5f0f\u53d6\u5730\u5740\u6765\u533a\u5206\u5de6\u503c\u548c\u53f3\u503c\u3002\u53f3\u503c\u53c8\u5206\u4e3a\u5c06\u4ea1\u503c(xvalue\uff0cexpiringvalue)\u548c\u7eaf\u53f3\u503c(prvalue\uff0cPureRvalue)\u3002\u7eaf\u53f3\u503c\u5305\u62ec\u5206\u5f15\u7528\u8fd4\u56de\u7684\u4e34\u65f6\u53d8\u91cf\u3001\u8fd0\u7b97\u8868\u8fbe\u5f0f\u4ea7\u751f\u7684\u4e34\u65f6\u53d8\u91cf\u3001\u539f\u59cb\u5b57\u9762\u91cf\u548clambda\u8868\u8fbe\u5f0f\u7b49\uff1b\u5c06\u4ea1\u503c\u662fC++11\u65b0\u589e\u7684\uff0c\u5305\u62ec\u5c06\u8981\u88ab\u79fb\u52a8\u7684\u5bf9\u8c61\u3001T&amp;&amp;\u51fd\u6570\u8fd4\u56de\u503c\u3001std::move\u8fd4\u56de\u503c\u548c\u8f6c\u6362\u4e3aT&amp;&amp;\u7684\u7c7b\u578b\u7684\u8f6c\u6362\u51fd\u6570\u7684\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u53f3\u503c\u4e0d\u5177\u540d\uff0c\u6240\u4ee5\u53ea\u80fd\u901a\u8fc7\u5f15\u7528\u7684\u65b9\u5f0f\u6765\u627e\u5230\u5b83\u3002\u800c\u65e0\u8bba\u662f\u58f0\u660e\u5de6\u503c\u5f15\u7528\u8fd8\u662f\u53f3\u503c\u5f15\u7528\uff0c\u90fd\u5fc5\u987b\u7acb\u5373\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u56e0\u4e3a\u5f15\u7528\u7c7b\u578b\u672c\u8eab\u5e76\u4e0d\u62e5\u6709\u6240\u7ed1\u5b9a\u5bf9\u8c61\u7684\u5185\u5b58\u3002\u800c\u53f3\u503c\u5f15\u7528\u7684\u58f0\u660e\u53c8\u4f7f\u5f97\u8be5\u53f3\u503c\u53c8\u201c\u91cd\u83b7\u65b0\u751f\u201d\uff0c\u5176\u751f\u547d\u5468\u671f\u53d8\u5f97\u4e0e\u53f3\u503c\u5f15\u7528\u7c7b\u578b\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\u4e00\u6837\uff0c\u53ea\u8981\u8be5\u53d8\u91cf\u8fd8\u6d3b\u7740\uff0c\u8be5\u53f3\u503c\u4e34\u65f6\u91cf\u5c31\u4f1a\u4e00\u76f4\u5b58\u6d3b\u4e0b\u53bb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f5c\u8005\u4e3e\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>   #include &lt;iostream&gt;\n   using namespace std;\n\n   int g_constructCount = 0;\n   int g_copyConstructcount = 0;\n   int g_destructCount = 0;\n\n   struct A {\n     A() { cout &lt;&lt; \"construct: \" &lt;&lt; ++g_constructCount &lt;&lt; endl; }\n     A(const A&amp; a) { cout &lt;&lt; \"copy construct: \" &lt;&lt; ++g_copyConstructCount &lt;&lt; endl; }\n     ~A() { cout &lt;&lt; \"destruct: \" &lt;&lt; ++g_destructCount &lt;&lt; endl; }\n   }\n   A GetA() { return A(); }\n   int main() {\n     A a = GetA();\n     return 0;\n   }<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5173\u95edrvo\u4f18\u5316(<code>-fno-elide-constructors<\/code>)\u7684\u60c5\u51b5\u4e0b\uff0c\u4e0a\u8ff0\u4ee3\u7801\u4f1a\u8c03\u7528\u4e09\u6b21\u6784\u9020\u51fd\u6570\uff0c\u5206\u522b\u662f<code>GetA()<\/code>\u51fd\u6570\u5185\u90e8\u751f\u6210A\u5bf9\u8c61\uff0c<code>GetA()<\/code>\u51fd\u6570\u751f\u6210\u8fd4\u56de\u503c\uff0c\u751f\u6210\u5bf9\u8c61a\u3002\u5982\u679c\u628a<code>A a = GetA()<\/code>\u6539\u6210<code>A &amp;&amp;a = GetA()<\/code>\uff0c\u90a3\u4e48\u5c31\u4f1a\u5c11\u6389\u751f\u6210\u5bf9\u8c61a\u8fd9\u4e00\u6b21\uff0c\u56e0\u4e3a\u73b0\u5728a\u662f<code>GetA()<\/code>\u51fd\u6570\u8fd4\u56de\u503c\u7684\u5f15\u7528\u4e86\u3002\u6539\u6210<code>const A&amp; a = GetA()<\/code>\u4e5f\u53ef\u4ee5\u8fbe\u5230\u8fd9\u4e2a\u6548\u679c\uff0c\u56e0\u4e3a\u5e38\u91cf\u5de6\u503c\u5f15\u7528\u662f\u4e00\u4e2a&#8221;\u4e07\u80fd&#8221;\u7684\u5f15\u7528\u7c7b\u578b\uff0c\u53ef\u4ee5\u63a5\u53d7\u5de6\u503c\u3001\u53f3\u503c\u3001\u5e38\u91cf\u5de6\u503c\u548c\u5e38\u91cf\u53f3\u503c\u3002\u4f46\u662f\u6539\u4e3a\u666e\u901a\u7684\u5de6\u503c\u5f15\u7528\u5c31\u4e0d\u884c\u4e86\uff0c\u4f1a\u7f16\u8bd1\u9519\u8bef\uff0c\u666e\u901a\u7684\u5de6\u503c\u5f15\u7528\u53ea\u63a5\u53d7\u5de6\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>T&amp;&amp;<\/code>\u5e76\u4e0d\u4e00\u5b9a\u8868\u793a\u53f3\u503c\uff0c\u5728\u53d1\u751f\u7c7b\u578b\u63a8\u5bfc\u7684\u65f6\u5019<code>T&amp;&amp;<\/code>\u4ee3\u8868\u4e07\u80fd\u5f15\u7528\u6216\u8005\u901a\u7528\u5f15\u7528(universal references)\uff0c\u53ef\u4ee5\u662f\u5de6\u503c\u4e5f\u53ef\u4ee5\u662f\u53f3\u503c\u3002\u53d1\u751f\u7c7b\u578b\u63a8\u5bfc\u7684\u60c5\u666f\u6709\u6a21\u677f\u548cauto\u3002\u6ce8\u610f\u4e00\u5b9a\u8981\u662f\u53d1\u751f\u7c7b\u578b\u63a8\u5bfc\u65f6\u624d\u662f\u4e07\u80fd\u5f15\u7528\uff0c\u5426\u5219\u53ea\u662f\u666e\u901a\u7684\u53f3\u503c\u5f15\u7528\u3002\u53ea\u6709T&amp;&amp;\u624d\u53ef\u4ee5\u8868\u793auniversal references\uff0c\u4efb\u4f55\u9644\u52a0\u6761\u4ef6\u5982<code>const universal references<\/code>\u90fd\u4f1a\u4f7f\u5176\u5931\u6548\u53d8\u6210\u666e\u901a\u7684\u53f3\u503c\u5f15\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f15\u7528\u6298\u53e0\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u6240\u6709\u7684\u53f3\u503c\u5f15\u7528\u53e0\u52a0\u5230\u53f3\u503c\u5f15\u7528\u4e0a\u4ecd\u7136\u8fd8\u662f\u4e00\u4e2a\u53f3\u503c\u5f15\u7528\uff1b<\/li><li>\u6240\u6709\u7684\u5176\u4ed6\u5f15\u7528\u7c7b\u578b\u4e4b\u95f4\u7684\u53e0\u52a0\u90fd\u5c06\u53d8\u6210\u5de6\u503c\u5f15\u7528\uff1b<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u4e8e&amp;&amp;\u7684\u603b\u7ed3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5de6\u503c\u548c\u53f3\u503c\u662f\u72ec\u7acb\u4e8e\u5b83\u4eec\u7684\u7c7b\u578b\u7684\uff0c\u53f3\u503c\u5f15\u7528\u7c7b\u578b\u53ef\u80fd\u662f\u5de6\u503c\u4e5f\u53ef\u80fd\u662f\u53f3\u503c\uff1b<\/li><li>auto&amp;&amp;\u6216\u51fd\u6570\u53c2\u6570\u7c7b\u578b\u81ea\u52a8\u63a8\u5bfc\u7684T&amp;&amp;\u662f\u4e00\u4e2a\u672a\u5b9a\u7684\u5f15\u7528\u7c7b\u578b\uff0c\u88ab\u79f0\u4e3auniversal references\uff0c\u5b83\u53ef\u80fd\u662f\u5de6\u503c\u5f15\u7528\u4e5f\u53ef\u80fd\u662f\u53f3\u503c\u5f15\u7528\u7c7b\u578b\uff0c\u53d6\u51b3\u4e8e\u521d\u59cb\u5316\u7684\u503c\u7c7b\u578b\uff1b<\/li><li>\u6240\u6709\u7684\u53f3\u503c\u5f15\u7528\u53e0\u52a0\u5230\u53f3\u503c\u5f15\u7528\u4e0a\u4ecd\u7136\u662f\u4e00\u4e2a\u53f3\u503c\u5f15\u7528\uff0c\u5176\u4ed6\u5f15\u7528\u6298\u53e0\u90fd\u4e3a\u5de6\u503c\u5f15\u7528\u3002\u5f53T&amp;&amp;\u4e3a\u6a21\u677f\u53c2\u6570\u65f6\uff0c\u8f93\u5165\u5de6\u503c\uff0c\u5b83\u4f1a\u53d8\u6210\u5de6\u503c\u5f15\u7528\uff0c\u800c\u8f93\u5165\u53f3\u503c\u65f6\u5219\u53d8\u4e3a\u5177\u540d\u7684\u53f3\u503c\u5f15\u7528\u3002<\/li><li>\u7f16\u8bd1\u5668\u4f1a\u5c06\u5df2\u547d\u540d\u7684\u53f3\u503c\u5f15\u7528\u89c6\u4e3a\u5de6\u503c\uff0c\u800c\u5c06\u672a\u547d\u540d\u7684\u53f3\u503c\u5f15\u7528\u89c6\u4e3a\u53f3\u503c\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u81ea\u5b9a\u4e49\u7684\u53f3\u503c\u7248\u672c\u62f7\u8d1d\u6784\u9020\u51fd\u6570\u548c\u8d4b\u503c\u51fd\u6570\u51fd\u6570\u53ef\u4ee5\u8f6c\u79fb\u5bf9\u8c61\u5185\u5b58\u5728\u5806\u4e0a\u7684\u8d44\u6e90\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"move%E8%AF%AD%E4%B9%89\"><\/span>move\u8bed\u4e49<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7<code>A&amp; A::operator=(const A&amp;&amp;rhs)<\/code>\u8fd9\u6837\u7684move constructor\u6216\u8005<code>std::move<\/code>\u51fd\u6570\u6765\u8f6c\u79fb\u5bf9\u8c61\u7684\u8d44\u6e90(\u5185\u5b58\u3001\u6587\u4ef6\u53e5\u67c4\u7b49)\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6df1\u62f7\u8d1d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"forward%E5%92%8C%E5%AE%8C%E7%BE%8E%E8%BD%AC%E5%8F%91\"><\/span>forward\u548c\u5b8c\u7f8e\u8f6c\u53d1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"emplace_back%E5%87%8F%E5%B0%91%E5%86%85%E5%AD%98%E6%8B%B7%E8%B4%9D%E5%92%8C%E7%A7%BB%E5%8A%A8\"><\/span>emplace_back\u51cf\u5c11\u5185\u5b58\u62f7\u8d1d\u548c\u79fb\u52a8<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9700\u8981\u6ce8\u610f\u5982\u679c\u539f\u6765\u7684\u5bb9\u5668\u4e2d\u5c31\u6709\u76f8\u5e94\u7684key\uff0c<code>emplace_back<\/code>\u4e0d\u80fd\u66f4\u65b0\u503c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%97%A0%E5%BA%8F%E5%AE%B9%E5%99%A8\"><\/span>\u65e0\u5e8f\u5bb9\u5668<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7<code>unordered_map<\/code>\u3001<code>unordered_multimap<\/code>\u3001<code>unordered_set<\/code>\u3001<code>unordered_multiset<\/code>\u63d0\u4f9bhash\u8868\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u7684key\u7c7b\u578b\uff0c\u9700\u8981\u5b9e\u73b0key\u7684hash\u51fd\u6570\u548c\u6bd4\u8f83\u51fd\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528C++11\u6539\u8fdb\u7a0b\u5e8f\u6027\u80fd \u53f3\u503c\u5f15\u7528 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