{"id":108177,"date":"2026-09-21T07:25:32","date_gmt":"2026-09-20T23:25:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/108177.html"},"modified":"2026-09-21T07:25:32","modified_gmt":"2026-09-20T23:25:32","slug":"c20%e6%a8%a1%e6%9d%bf%e5%85%83%e7%bc%96%e7%a8%8b-05%ef%bc%9a%e5%90%83%e9%80%8f%e5%8f%98%e5%8f%82%e6%a8%a1%e6%9d%bf%ef%bc%8c%e8%a7%a3%e9%94%81%e7%bc%96%e8%af%91%e6%9c%9f%e4%b8%87%e8%83%bd%e5%8f%82","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/108177.html","title":{"rendered":"C++20\u6a21\u677f\u5143\u7f16\u7a0b 05\uff1a\u5403\u900f\u53d8\u53c2\u6a21\u677f\uff0c\u89e3\u9501\u7f16\u8bd1\u671f\u4e07\u80fd\u53c2\u6570\u80fd\u529b"},"content":{"rendered":"<\/p>\n<h4>C&#043;&#043;20\u6a21\u677f\u5143\u7f16\u7a0b 05&#xff1a;\u5403\u900f\u53d8\u53c2\u6a21\u677f&#xff0c;\u89e3\u9501\u7f16\u8bd1\u671f\u4e07\u80fd\u53c2\u6570\u80fd\u529b<\/h4>\n<ul>\n<li>Bilibili \u540c\u6b65\u89c6\u9891<\/li>\n<li>\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u53d8\u53c2\u6a21\u677f&#xff1f;\u544a\u522b\u6a21\u677f\u53c2\u6570\u201c\u56fa\u5b9a\u67b7\u9501\u201d<\/li>\n<li>\n<ul>\n<li>1.1 \u4e24\u5927\u6838\u5fc3\u5f62\u53c2\u5305&#xff08;C&#043;&#043;20\u6807\u51c6&#xff09;<\/li>\n<li>1.2 \u53d8\u53c2\u6a21\u677f\u7684\u6838\u5fc3\u5e94\u7528\u573a\u666f<\/li>\n<li>1.3 \u6700\u7b80\u5165\u95e8\u4ee3\u7801\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u53d8\u53c2\u51fd\u6570\u6a21\u677f&#xff1a;\u6700\u6613\u4e0a\u624b\u7684\u5b9e\u6218\u5f62\u6001<\/li>\n<li>\n<ul>\n<li>2.1 \u57fa\u7840\u8bed\u6cd5\u7ed3\u6784<\/li>\n<li>2.2 \u7ecf\u5178\u9012\u5f52\u5c55\u5f00\u65b9\u6848&#xff08;\u517c\u5bb9\u5168C&#043;&#043;\u7248\u672c&#xff09;<\/li>\n<li>2.3 \u9ad8\u9636\u5b9e\u6218&#xff1a;\u53d8\u53c2&#043;\u4e07\u80fd\u5f15\u7528&#043;\u5b8c\u7f8e\u8f6c\u53d1<\/li>\n<li>2.4 \u6838\u5fc3\u7f16\u7801\u89c4\u5219&#xff08;\u907f\u5751\u91cd\u70b9&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u5f62\u53c2\u5305\u6df1\u5ea6\u89e3\u6790&#xff1a;\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u6838\u5fc3\u6839\u57fa&#x1f4a1;<\/li>\n<li>\n<ul>\n<li>3.1 \u5f62\u53c2\u5305\u7684\u4e24\u79cd\u5f62\u6001<\/li>\n<li>3.2 \u6838\u5fc3\u5de5\u5177&#xff1a;sizeof&#8230;() \u83b7\u53d6\u53c2\u6570\u5305\u957f\u5ea6<\/li>\n<li>3.3 \u5305\u5c55\u5f00\u5b8c\u6574\u89c4\u5219<\/li>\n<li>3.4 \u5f62\u53c2\u5305\u7684\u786c\u6027\u9650\u5236&#xff08;\u5fc5\u907f\u5751&#xff09;<\/li>\n<li>3.5 C&#043;&#043;20\u4e13\u5c5e&#xff1a;\u7c7b\u578b\u5305 &amp; \u503c\u5305\u5143\u7f16\u7a0b\u5b9e\u6218<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u5168\u6587\u6838\u5fc3\u77e5\u8bc6\u70b9\u603b\u7ed3&#x1f4dd;<\/li>\n<\/ul>\n<p>\u73a9C&#043;&#043;\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u5c0f\u4f19\u4f34\u5e94\u8be5\u90fd\u6709\u8fc7\u8fd9\u6837\u7684\u56f0\u6270&#xff1a;\u666e\u901a\u6a21\u677f\u5c31\u50cf\u201c\u56fa\u5b9a\u89c4\u683c\u7684\u6536\u7eb3\u76d2\u201d&#xff0c;\u53ea\u80fd\u63a5\u6536\u56fa\u5b9a\u6570\u91cf\u3001\u56fa\u5b9a\u5f62\u5f0f\u7684\u53c2\u6570&#xff0c;\u4e00\u65e6\u9047\u5230\u591a\u53c2\u6570\u9002\u914d\u3001\u6279\u91cf\u7c7b\u578b\u5904\u7406\u3001\u901a\u7528\u53c2\u6570\u8f6c\u53d1\u573a\u666f&#xff0c;\u77ac\u95f4\u675f\u624b\u65e0\u7b56\u3002<\/p>\n<p>\u60f3\u8981\u5b9e\u73b0\u4efb\u610f\u6570\u91cf\u3001\u4efb\u610f\u7c7b\u578b\u7684\u53c2\u6570\u517c\u5bb9&#xff0c;\u6253\u9020\u771f\u6b63\u901a\u7528\u7684\u7f16\u8bd1\u671f\u4ee3\u7801\u903b\u8f91&#xff0c;**\u53d8\u53c2\u6a21\u677f&#xff08;Variadic Templates&#xff09;**\u5c31\u662f\u7ed5\u4e0d\u5f00\u7684\u6838\u5fc3\u57fa\u77f3\u2705<\/p>\n<p>\u4eceC&#043;&#043;11\u6b63\u5f0f\u95ee\u4e16&#xff0c;\u5230C&#043;&#043;20\u6301\u7eed\u4f18\u5316\u5b8c\u5584&#xff0c;\u53d8\u53c2\u6a21\u677f\u5df2\u7136\u6210\u4e3aSTL\u5e95\u5c42\u7684\u6838\u5fc3\u652f\u67f1\u3002\u6211\u4eec\u719f\u77e5\u7684std::tuple\u3001\u4e07\u80fd\u8f6c\u53d1\u3001\u5bb9\u5668\u539f\u4f4d\u6784\u9020\u3001\u7f16\u8bd1\u671f\u7c7b\u578b\u5217\u8868\u7b49\u9ad8\u9891\u7279\u6027&#xff0c;\u5e95\u5c42\u5168\u90e8\u4f9d\u8d56\u5b83\u5b9e\u73b0\u3002\u4eca\u5929\u6211\u4eec\u5c31\u4ece\u96f6\u5403\u900f\u53d8\u53c2\u6a21\u677f\u6838\u5fc3\u6838\u5fc3\u77e5\u8bc6\u70b9&#xff0c;\u641e\u5b9a\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u5173\u952e\u8fdb\u9636\u80fd\u529b&#xff01;<\/p>\n<h2>Bilibili \u540c\u6b65\u89c6\u9891<\/h2>\n<p>C&#043;&#043;20\u6a21\u677f\u5143\u7f16\u7a0b 05&#xff1a;\u5403\u900f\u53d8\u53c2\u6a21\u677f&#xff0c;\u89e3\u9501\u7f16\u8bd1\u671f\u4e07\u80fd\u53c2\u6570\u80fd\u529b<\/p>\n<h2>\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u53d8\u53c2\u6a21\u677f&#xff1f;\u544a\u522b\u6a21\u677f\u53c2\u6570\u201c\u56fa\u5b9a\u67b7\u9501\u201d<\/h2>\n<p>\u5728\u53d8\u53c2\u6a21\u677f\u8bde\u751f\u4e4b\u524d&#xff0c;\u4f20\u7edf\u6a21\u677f\u7684\u77ed\u677f\u975e\u5e38\u81f4\u547d&#xff0c;\u53c2\u6570\u6570\u91cf\u5b8c\u5168\u56fa\u5316&#xff0c;\u6beb\u65e0\u7075\u6d3b\u6027\u53ef\u8a00\u3002<\/p>\n<p>\u6bd4\u5982\u6211\u4eec\u60f3\u5199\u4e00\u4e2a\u901a\u7528\u6253\u5370\u51fd\u6570&#xff0c;\u652f\u6301\u6253\u5370int\u3001\u6d6e\u70b9\u6570\u3001\u5b57\u7b26\u4e32\u3001\u81ea\u5b9a\u4e49\u7c7b\u578b\u7b49\u4efb\u610f\u53c2\u6570&#xff0c;\u4f20\u7edf\u6a21\u677f\u53ea\u80fd\u9010\u4e2a\u91cd\u8f7d\u3001\u56fa\u5b9a\u53c2\u6570\u4e2a\u6570&#xff0c;\u4ee3\u7801\u5197\u4f59\u4e14\u6269\u5c55\u6027\u6781\u5dee\u3002\u9762\u5bf9\u4e0d\u786e\u5b9a\u53c2\u6570\u6570\u91cf\u7684\u4e1a\u52a1\u573a\u666f&#xff0c;\u4f20\u7edf\u6a21\u677f\u57fa\u672c\u675f\u624b\u65e0\u7b56\u3002<\/p>\n<p>\u800cC&#043;&#043;\u5f15\u5165\u7684\u53d8\u53c2\u6a21\u677f&#xff0c;\u76f4\u63a5\u6253\u7834\u4e86\u8fd9\u4e2a\u9650\u5236&#xff0c;\u6838\u5fc3\u6838\u5fc3\u5c31\u662f\u5f62\u53c2\u5305&#xff08;Parameter Pack&#xff09;&#xff0c;\u6807\u5fd7\u6027\u8bed\u6cd5\u5c31\u662f\u4e07\u80fd\u7684 &#8230; \u7b26\u53f7&#xff0c;\u582a\u79f0\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u201c\u4e07\u80fd\u6536\u7eb3\u795e\u5668\u201d&#x1f4af;<\/p>\n<h3>1.1 \u4e24\u5927\u6838\u5fc3\u5f62\u53c2\u5305&#xff08;C&#043;&#043;20\u6807\u51c6&#xff09;<\/h3>\n<p>\u53d8\u53c2\u6a21\u677f\u7684\u6240\u6709\u80fd\u529b&#xff0c;\u90fd\u57fa\u4e8e\u4e24\u79cd\u5f62\u53c2\u5305&#xff0c;\u9002\u914d\u4e0d\u540c\u7f16\u8bd1\u671f\u53c2\u6570\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\n<p>typename&#8230; Ts****\u7c7b\u578b\u5f62\u53c2\u5305 &#xff1a;\u53ef\u63a5\u65360\u4e2a\u30011\u4e2a\u6216\u4efb\u610f\u591a\u4e2a\u4e0d\u540c\u7c7b\u578b\u7684\u53c2\u6570&#xff0c;\u4e13\u6ce8\u5904\u7406\u7c7b\u578b\u5c42\u9762\u7684\u5143\u7f16\u7a0b\u903b\u8f91<\/p>\n<\/li>\n<li>\n<p>auto&#8230; Vs****\u975e\u7c7b\u578b\u5f62\u53c2\u5305 &#xff08;C&#043;&#043;20\u65b0\u589e\u5f3a\u5316&#xff09;&#xff1a;\u652f\u6301\u63a5\u6536\u4efb\u610f\u7f16\u8bd1\u671f\u5e38\u91cf&#xff08;\u6570\u5b57\u3001\u5e03\u5c14\u503c\u3001\u679a\u4e3e\u7b49&#xff09;&#xff0c;\u5b9e\u73b0\u503c\u5c42\u9762\u7684\u7f16\u8bd1\u671f\u8ba1\u7b97<\/p>\n<\/li>\n<\/ul>\n<h3>1.2 \u53d8\u53c2\u6a21\u677f\u7684\u6838\u5fc3\u5e94\u7528\u573a\u666f<\/h3>\n<p>\u770b\u4f3c\u7b80\u5355\u7684\u8bed\u6cd5&#xff0c;\u5374\u652f\u6491\u4e86C&#043;&#043;\u5927\u534a\u7684\u901a\u7528\u80fd\u529b&#xff0c;\u65e5\u5e38\u5f00\u53d1\u3001\u5e95\u5c42\u6846\u67b6\u3001\u5143\u7f16\u7a0b\u5f00\u53d1\u4e2d\u968f\u5904\u53ef\u89c1&#xff1a;<\/p>\n<li>\n<p>\u7c7b\u578b\u5b89\u5168\u7684\u53ef\u53d8\u53c2\u6570\u65e5\u5fd7\u6253\u5370&#xff0c;\u66ff\u4ee3\u4e0d\u5b89\u5168\u7684printf<\/p>\n<\/li>\n<li>\n<p>\u6807\u51c6\u5e93\u6838\u5fc3\u5bb9\u5668&#xff1a;std::tuple\u3001std::variant \u7684\u5e95\u5c42\u5b9e\u73b0<\/p>\n<\/li>\n<li>\n<p>\u4e07\u80fd\u53c2\u6570\u8f6c\u53d1\u3001\u5bb9\u5668\u539f\u4f4d\u6784\u9020&#xff08;emplace_back\u5e95\u5c42\u539f\u7406&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u6784\u5efa\u7f16\u8bd1\u671f\u7c7b\u578b\u5217\u8868\u3001\u503c\u5217\u8868&#xff0c;\u5b9e\u73b0\u6279\u91cf\u7c7b\u578b\u5224\u65ad\u3001\u7b5b\u9009\u3001\u8ba1\u7b97<\/p>\n<\/li>\n<li>\n<p>\u6a21\u677f\u5143\u7f16\u7a0b\u4e2d\u6279\u91cf\u5904\u7406\u4e00\u7ec4\u7c7b\u578b&#xff0c;\u5b8c\u6210\u7f16\u8bd1\u671f\u903b\u8f91\u8fd0\u7b97<\/p>\n<\/li>\n<h3>1.3 \u6700\u7b80\u5165\u95e8\u4ee3\u7801\u793a\u4f8b<\/h3>\n<p>\u5148\u611f\u53d7\u4e00\u4e0b\u53d8\u53c2\u6a21\u677f\u7684\u7075\u6d3b\u6027&#xff0c;\u65e0\u9700\u56fa\u5b9a\u53c2\u6570\u6570\u91cf&#xff0c;\u9002\u914d\u6240\u6709\u573a\u666f&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53d8\u53c2\u6a21\u677f\u51fd\u6570&#xff1a;\u63a5\u6536\u4efb\u610f\u6570\u91cf\u3001\u4efb\u610f\u7c7b\u578b\u53c2\u6570<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">universal_func<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4ec5\u505a\u5360\u4f4d\u6f14\u793a&#xff0c;\u540e\u7eed\u9010\u6b65\u5b8c\u5584\u903b\u8f91<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">universal_func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                <span class=\"token comment\">\/\/ \u652f\u63010\u4e2a\u53c2\u6570<\/span><br \/>\n    <span class=\"token function\">universal_func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u652f\u63011\u4e2aint\u53c2\u6570<\/span><br \/>\n    <span class=\"token function\">universal_func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3.14<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;C&#043;&#043;20&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u652f\u6301\u591a\u7c7b\u578b\u591a\u53c2\u6570<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u26a0\ufe0f \u5173\u952e\u89c4\u5219&#xff1a;\u5f62\u53c2\u5305\u5fc5\u987b\u653e\u5728\u6a21\u677f\u53c2\u6570\u5217\u8868\u672b\u5c3e&#xff0c;\u8be5\u89c4\u5219\u5728C&#043;&#043;20\u4e2d\u4f9d\u7136\u4fdd\u7559&#xff0c;\u662f\u7f16\u7801\u5fc5\u5b88\u89c4\u8303&#xff01;<\/p>\n<h2>\u4e8c\u3001\u53d8\u53c2\u51fd\u6570\u6a21\u677f&#xff1a;\u6700\u6613\u4e0a\u624b\u7684\u5b9e\u6218\u5f62\u6001<\/h2>\n<p>\u53d8\u53c2\u51fd\u6570\u6a21\u677f\u662f\u6211\u4eec\u65e5\u5e38\u5f00\u53d1\u4f7f\u7528\u6700\u591a\u7684\u5f62\u5f0f&#xff0c;\u57fa\u4e8e\u5f62\u53c2\u5305\u5b9e\u73b0\u4efb\u610f\u53c2\u6570\u7684\u51fd\u6570\u9002\u914d&#xff0c;\u4e5f\u662f\u7406\u89e3\u53d8\u53c2\u5c55\u5f00\u903b\u8f91\u7684\u6700\u4f73\u5165\u53e3\u3002<\/p>\n<h3>2.1 \u57fa\u7840\u8bed\u6cd5\u7ed3\u6784<\/h3>\n<p><span class=\"token comment\">\/\/ Ts&#8230;&#xff1a;\u6a21\u677f\u7c7b\u578b\u5f62\u53c2\u5305&#xff08;\u6536\u7eb3\u6240\u6709\u53c2\u6570\u7c7b\u578b&#xff09;<\/span><br \/>\n<span class=\"token comment\">\/\/ args&#8230;&#xff1a;\u51fd\u6570\u5f62\u53c2\u5305&#xff08;\u6536\u7eb3\u6240\u6709\u53c2\u6570\u6570\u503c&#xff09;<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n\u8fd4\u56de\u503c\u7c7b\u578b \u51fd\u6570\u540d<span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u90e8\u5b8c\u6210\u5305\u5c55\u5f00\u3001\u903b\u8f91\u5904\u7406<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.2 \u7ecf\u5178\u9012\u5f52\u5c55\u5f00\u65b9\u6848&#xff08;\u517c\u5bb9\u5168C&#043;&#043;\u7248\u672c&#xff09;<\/h3>\n<p>\u5728C&#043;&#043;17\u6298\u53e0\u8868\u8fbe\u5f0f\u95ee\u4e16\u4e4b\u524d&#xff0c;\u6a21\u677f\u9012\u5f52 &#043; \u7a7a\u5305\u7ec8\u6b62\u91cd\u8f7d\u662f\u53d8\u53c2\u5904\u7406\u7684\u552f\u4e00\u65b9\u6848&#xff0c;\u4e5f\u662f\u7406\u89e3\u53d8\u53c2\u62c6\u89e3\u903b\u8f91\u7684\u6838\u5fc3&#xff0c;C&#043;&#043;20\u9879\u76ee\u4e2d\u4f9d\u7136\u5927\u91cf\u6cbf\u7528\u3002<\/p>\n<p>\u6838\u5fc3\u903b\u8f91&#xff1a;\u6bcf\u6b21\u9012\u5f52\u5265\u79bb\u7b2c\u4e00\u4e2a\u53c2\u6570&#xff0c;\u5269\u4f59\u53c2\u6570\u7ee7\u7eed\u9012\u5f52&#xff0c;\u76f4\u5230\u53c2\u6570\u5305\u4e3a\u7a7a&#xff0c;\u5339\u914d\u7ec8\u6b62\u51fd\u6570\u7ed3\u675f\u9012\u5f52\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9012\u5f52\u7ec8\u6b62\u51fd\u6570&#xff1a;\u7a7a\u53c2\u6570\u5305\u4e13\u5c5e\u5339\u914d<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">print_variadic<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u53c2\u6570\u6253\u5370\u5b8c\u6210&#xff01;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9012\u5f52\u62c6\u89e3\u51fd\u6570&#xff1a;\u53d6\u51fa\u9996\u4e2a\u53c2\u6570&#xff0c;\u5269\u4f59\u53c2\u6570\u9012\u5f52\u5904\u7406<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span> <span class=\"token class-name\">T<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">print_variadic<\/span><span class=\"token punctuation\">(<\/span>T first_param<span class=\"token punctuation\">,<\/span> Ts<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> rest_params<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6253\u5370\u5f53\u524d\u62c6\u89e3\u7684\u9996\u4e2a\u53c2\u6570<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u89e3\u6790\u53c2\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> first_param <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9012\u5f52\u5c55\u5f00\u5269\u4f59\u53c2\u6570\u5305<\/span><br \/>\n    <span class=\"token function\">print_variadic<\/span><span class=\"token punctuation\">(<\/span>rest_params<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4efb\u610f\u7c7b\u578b\u3001\u4efb\u610f\u6570\u91cf\u53c2\u6570\u76f4\u63a5\u4f20\u5165<\/span><br \/>\n    <span class=\"token function\">print_variadic<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">666<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3.1415<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;C&#043;&#043;20\u6a21\u677f\u5143\u7f16\u7a0b&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token char\">&#039;A&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u903b\u8f91&#xff1a;\u7f16\u8bd1\u5668\u4f1a\u5728\u7f16\u8bd1\u671f\u81ea\u52a8\u5b8c\u6210\u6240\u6709\u9012\u5f52\u5b9e\u4f8b\u5316&#xff0c;\u800c\u975e\u8fd0\u884c\u65f6\u5faa\u73af&#xff0c;\u96f6\u8fd0\u884c\u65f6\u5f00\u9500&#xff0c;\u8fd9\u4e5f\u662f\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u6838\u5fc3\u4f18\u52bf\u2728<\/p>\n<h3>2.3 \u9ad8\u9636\u5b9e\u6218&#xff1a;\u53d8\u53c2&#043;\u4e07\u80fd\u5f15\u7528&#043;\u5b8c\u7f8e\u8f6c\u53d1<\/h3>\n<p>\u5728\u6846\u67b6\u5f00\u53d1\u3001\u901a\u7528\u5c01\u88c5\u4e2d&#xff0c;\u6211\u4eec\u4e0d\u4ec5\u9700\u8981\u63a5\u6536\u4efb\u610f\u53c2\u6570&#xff0c;\u66f4\u9700\u8981\u4fdd\u7559\u53c2\u6570\u7684\u5de6\/\u53f3\u503c\u5c5e\u6027&#xff0c;\u907f\u514d\u53c2\u6570\u62f7\u8d1d\u635f\u8017&#xff0c;\u8fd9\u5c31\u9700\u8981\u300c\u53d8\u53c2\u5305 &#043; \u4e07\u80fd\u5f15\u7528 &#043; \u5b8c\u7f8e\u8f6c\u53d1\u300d\u7ec4\u5408\u6280\u3002<\/p>\n<p>\u8be5\u7ec4\u5408\u662fSTL\u4e2dstd::make_unique\u3001emplace_back\u3001\u7ebf\u7a0b\u51fd\u6570\u5c01\u88c5\u7684\u5e95\u5c42\u6838\u5fc3\u903b\u8f91&#xff01;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;utility&gt;<\/span> <span class=\"token comment\">\/\/ std::forward \u4f9d\u8d56\u5934\u6587\u4ef6<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u76ee\u6807\u51fd\u6570&#xff1a;\u63a5\u6536\u4efb\u610f\u53c2\u6570<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">target_func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&amp;<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span><span class=\"token operator\">&amp;&amp;<\/span> b<span class=\"token punctuation\">,<\/span> string c<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u53c2\u6570\u63a5\u6536\u5b8c\u6210&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> a <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; | &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> b <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; | &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> c <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e07\u80fd\u8f6c\u53d1\u5c01\u88c5&#xff1a;\u517c\u5bb9\u6240\u6709\u5de6\u503c\u3001\u53f3\u503c\u53c2\u6570<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">wrapper_func<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token operator\">&amp;&amp;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5b8c\u7f8e\u8f6c\u53d1&#xff1a;\u4fdd\u7559\u53c2\u6570\u539f\u59cb\u5c5e\u6027&#xff0c;\u65e0\u62f7\u8d1d\u3001\u65e0\u635f\u8017<\/span><br \/>\n    <span class=\"token function\">target_func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token generic-function\"><span class=\"token function\">forward<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>Ts<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">wrapper_func<\/span><span class=\"token punctuation\">(<\/span>num<span class=\"token punctuation\">,<\/span> <span class=\"token number\">99.9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u6a21\u677f\u8f6c\u53d1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.4 \u6838\u5fc3\u7f16\u7801\u89c4\u5219&#xff08;\u907f\u5751\u91cd\u70b9&#xff09;<\/h3>\n<ul>\n<li>\n<p>\u5305\u5c55\u5f00\u7b26\u53f7 &#8230; \u4ec5\u80fd\u7d27\u8ddf\u5f62\u53c2\u5305\u540d\u4f7f\u7528&#xff0c;\u4e0d\u80fd\u968f\u610f\u6446\u653e<\/p>\n<\/li>\n<li>\n<p>\u53d8\u53c2\u5c55\u5f00\u662f\u7f16\u8bd1\u671f\u5b9e\u4f8b\u5316&#xff0c;\u4e0d\u540c\u6570\u91cf\u3001\u4e0d\u540c\u7c7b\u578b\u53c2\u6570\u90fd\u4f1a\u751f\u6210\u72ec\u7acb\u4ee3\u7801\u5b9e\u4f8b<\/p>\n<\/li>\n<li>\n<p>\u53d8\u53c2\u6a21\u677f\u652f\u6301\u91cd\u8f7d&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5339\u914d\u4f18\u5148\u7ea7\u6700\u9ad8\u7684\u91cd\u8f7d\u51fd\u6570<\/p>\n<\/li>\n<\/ul>\n<h2>\u4e09\u3001\u5f62\u53c2\u5305\u6df1\u5ea6\u89e3\u6790&#xff1a;\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u6838\u5fc3\u6839\u57fa&#x1f4a1;<\/h2>\n<p>\u5982\u679c\u8bf4\u53d8\u53c2\u6a21\u677f\u662f\u5de5\u5177&#xff0c;\u90a3\u5f62\u53c2\u5305\u5c31\u662f\u5de5\u5177\u7684\u5185\u6838\u3002\u6240\u6709\u53d8\u53c2\u903b\u8f91\u3001\u7f16\u8bd1\u671f\u7c7b\u578b\u8ba1\u7b97\u3001\u6279\u91cf\u5143\u7f16\u7a0b\u64cd\u4f5c&#xff0c;\u5168\u90e8\u57fa\u4e8e\u5f62\u53c2\u5305\u5b9e\u73b0&#xff0c;\u8fd9\u4e00\u8282\u5fc5\u987b\u5403\u900f&#xff01;<\/p>\n<h3>3.1 \u5f62\u53c2\u5305\u7684\u4e24\u79cd\u5f62\u6001<\/h3>\n<p>\u6839\u636e\u5b9a\u4e49\u4f4d\u7f6e&#xff0c;\u5206\u4e3a\u4e24\u7c7b&#xff0c;\u5206\u5de5\u660e\u786e&#xff1a;<\/p>\n<li>\n<p>\u6a21\u677f\u5f62\u53c2\u5305&#xff1a;\u5b9a\u4e49\u5728\u6a21\u677f\u5c16\u62ec\u53f7\u5185&#xff0c;\u7528\u4e8e\u6536\u7eb3\u7c7b\u578b\/\u7f16\u8bd1\u671f\u5e38\u91cf&#xff0c;\u670d\u52a1\u5143\u7f16\u7a0b\u7c7b\u578b\u8ba1\u7b97<\/p>\n<\/li>\n<li>\n<p>\u51fd\u6570\u5f62\u53c2\u5305&#xff1a;\u5b9a\u4e49\u5728\u51fd\u6570\u5706\u62ec\u53f7\u5185&#xff0c;\u7528\u4e8e\u6536\u7eb3\u8c03\u7528\u65f6\u4f20\u5165\u7684\u5b9e\u9645\u53c2\u6570<\/p>\n<\/li>\n<p>\u6838\u5fc3\u7279\u6027&#xff1a;\u5f62\u53c2\u5305\u5b58\u50a8\u7684\u662f\u7f16\u8bd1\u671f\u4fe1\u606f&#xff0c;\u8fd0\u884c\u65f6\u65e0\u4efb\u4f55\u5305\u5bf9\u8c61&#xff0c;\u6240\u6709\u5c55\u5f00\u3001\u8ba1\u7b97\u903b\u8f91\u5168\u90e8\u5728\u7f16\u8bd1\u9636\u6bb5\u5b8c\u6210&#xff0c;\u96f6\u8fd0\u884c\u65f6\u6027\u80fd\u5f00\u9500&#xff0c;\u8fd9\u662f\u6a21\u677f\u5143\u7f16\u7a0b\u540a\u6253\u666e\u901a\u8fd0\u884c\u65f6\u903b\u8f91\u7684\u5173\u952e&#xff01;<\/p>\n<h3>3.2 \u6838\u5fc3\u5de5\u5177&#xff1a;sizeof\u2026() \u83b7\u53d6\u53c2\u6570\u5305\u957f\u5ea6<\/h3>\n<p>\u666e\u901asizeof\u662f\u83b7\u53d6\u53d8\u91cf\u5185\u5b58\u5927\u5c0f&#xff0c;\u800c\u4e13\u5c5e\u8fd0\u7b97\u7b26 sizeof&#8230;() \u662f\u83b7\u53d6\u5f62\u53c2\u5305\u7684\u5143\u7d20\u4e2a\u6570&#xff0c;\u8fd4\u56de\u503c\u662f\u4e25\u683c\u7684\u7f16\u8bd1\u671f\u5e38\u91cf&#xff0c;\u53ef\u7528\u4e8e\u9759\u6001\u65ad\u8a00\u3001\u7f16\u8bd1\u671f\u5206\u652f\u5224\u65ad\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cassert&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">count_pack_size<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7c7b\u578b\u5305\u6570\u91cf &#061; \u53c2\u6570\u5305\u6570\u91cf&#xff0c;\u6c38\u8fdc\u7b49\u4ef7<\/span><br \/>\n    <span class=\"token keyword\">static_assert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u53c2\u6570\u5305\u6570\u91cf\u4e0d\u5339\u914d&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u5f53\u524d\u53c2\u6570\u5305\u5143\u7d20\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">count_pack_size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                  <span class=\"token comment\">\/\/ 0\u4e2a\u5143\u7d20<\/span><br \/>\n    <span class=\"token function\">count_pack_size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ 3\u4e2a\u5143\u7d20<\/span><br \/>\n    <span class=\"token function\">count_pack_size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;C&#043;&#043;&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3.14<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 4\u4e2a\u5143\u7d20<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u26a0\ufe0f \u9ad8\u9891\u8bef\u533a&#xff1a;\u5343\u4e07\u4e0d\u8981\u6df7\u6dc6 sizeof \u548c sizeof&#8230;()&#xff0c;\u524d\u8005\u6d4b\u5185\u5b58\u5927\u5c0f&#xff0c;\u540e\u8005\u6d4b\u53c2\u6570\u4e2a\u6570&#xff01;<\/p>\n<h3>3.3 \u5305\u5c55\u5f00\u5b8c\u6574\u89c4\u5219<\/h3>\n<p>\u5f53\u4ee3\u7801\u4e2d\u4e66\u5199 \u5305\u540d&#8230; \u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5c06\u53c2\u6570\u5305\u9010\u4e00\u679a\u4e3e\u3001\u9017\u53f7\u5206\u9694\u5c55\u5f00&#xff0c;\u9002\u914d\u591a\u79cd\u7f16\u8bd1\u671f\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u51fd\u6570\u8c03\u7528\u53c2\u6570\u5217\u8868\u5c55\u5f00<\/p>\n<\/li>\n<li>\n<p>\u6570\u7ec4\u3001\u5bb9\u5668\u521d\u59cb\u5316\u5217\u8868\u5c55\u5f00<\/p>\n<\/li>\n<li>\n<p>\u7c7b\u7ee7\u627f\u57fa\u7c7b\u5217\u8868\u3001\u6210\u5458\u521d\u59cb\u5316\u5217\u8868\u5c55\u5f00<\/p>\n<\/li>\n<li>\n<p>\u6a21\u677f\u53c2\u6570\u5217\u8868\u5c55\u5f00&#xff08;\u6784\u5efa\u7f16\u8bd1\u671f\u7c7b\u578b\u5217\u8868&#xff09;<\/p>\n<\/li>\n<\/ul>\n<p>\u6570\u7ec4\u5c55\u5f00\u5b9e\u6218\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">pack_expand_demo<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7f16\u8bd1\u671f\u5c55\u5f00\u53c2\u6570\u5305&#xff0c;\u521d\u59cb\u5316\u6570\u7ec4<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> args<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u904d\u5386\u6253\u5370\u5c55\u5f00\u7ed3\u679c<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> val <span class=\"token operator\">:<\/span> arr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        cout <span class=\"token operator\">&lt;&lt;<\/span> val <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">pack_expand_demo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">40<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5c55\u5f00\u4e3a {10,20,30,40}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.4 \u5f62\u53c2\u5305\u7684\u786c\u6027\u9650\u5236&#xff08;\u5fc5\u907f\u5751&#xff09;<\/h3>\n<p>\u5f62\u53c2\u5305\u867d\u4e07\u80fd&#xff0c;\u4f46\u5b58\u5728\u6838\u5fc3\u9650\u5236&#xff0c;\u65b0\u624b\u6781\u6613\u8e29\u5751&#xff1a;<\/p>\n<li>\n<p>\u4e0d\u652f\u6301\u76f4\u63a5\u4e0b\u6807\u8bbf\u95ee&#xff1a;\u65e0\u6cd5\u901a\u8fc7 Ts[0]\u3001args[1] \u83b7\u53d6\u5355\u4e2a\u5143\u7d20&#xff0c;\u60f3\u8981\u53d6\u6307\u5b9a\u4f4d\u7f6e\u53c2\u6570&#xff0c;\u9700\u8981\u501f\u52a9std::tuple\u6216\u81ea\u5b9a\u4e49\u5143\u51fd\u6570<\/p>\n<\/li>\n<li>\n<p>\u65e0\u6cd5\u5c40\u90e8\u5c55\u5f00&#xff1a;\u6bcf\u6b21\u5c55\u5f00\u53ea\u80fd\u5904\u7406\u5b8c\u6574\u53c2\u6570\u5305&#xff0c;\u4e0d\u80fd\u5355\u72ec\u5c55\u5f00\u90e8\u5206\u5143\u7d20<\/p>\n<\/li>\n<li>\n<p>\u4ec5\u7f16\u8bd1\u671f\u751f\u6548&#xff1a;\u6240\u6709\u5c55\u5f00\u903b\u8f91\u5728\u7f16\u8bd1\u9636\u6bb5\u5b8c\u6210&#xff0c;\u8fd0\u884c\u65f6\u65e0\u6cd5\u4fee\u6539\u3001\u904d\u5386\u53c2\u6570\u5305<\/p>\n<\/li>\n<h3>3.5 C&#043;&#043;20\u4e13\u5c5e&#xff1a;\u7c7b\u578b\u5305 &amp; \u503c\u5305\u5143\u7f16\u7a0b\u5b9e\u6218<\/h3>\n<p>C&#043;&#043;20\u5f3a\u5316\u4e86\u975e\u7c7b\u578b\u6a21\u677f\u53c2\u6570&#xff0c;\u8ba9\u6211\u4eec\u53ef\u4ee5\u540c\u65f6\u6784\u5efa\u7f16\u8bd1\u671f\u7c7b\u578b\u5217\u8868\u548c\u7f16\u8bd1\u671f\u503c\u5217\u8868&#xff0c;\u662f\u9ad8\u9636\u6a21\u677f\u5143\u7f16\u7a0b\u7684\u57fa\u7840\u5bb9\u5668\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7f16\u8bd1\u671f\u7c7b\u578b\u5217\u8868\u5bb9\u5668&#xff08;\u6536\u7eb3\u4efb\u610f\u7c7b\u578b&#xff09;<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Ts<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">TypeList<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">constexpr<\/span> size_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>Ts<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ C&#043;&#043;20 \u7f16\u8bd1\u671f\u503c\u5217\u8868\u5bb9\u5668&#xff08;\u6536\u7eb3\u4efb\u610f\u7f16\u8bd1\u671f\u5e38\u91cf&#xff09;<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">auto<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> Vs<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ValueList<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">constexpr<\/span> size_t size <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>Vs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u7c7b\u578b\u5217\u8868<\/span><br \/>\n    <span class=\"token keyword\">using<\/span> MyTypeList <span class=\"token operator\">&#061;<\/span> TypeList<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span><span class=\"token punctuation\">,<\/span> string<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">bool<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u503c\u5217\u8868<\/span><br \/>\n    <span class=\"token keyword\">using<\/span> MyValueList <span class=\"token operator\">&#061;<\/span> ValueList<span class=\"token operator\">&lt;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3.14<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">true<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7f16\u8bd1\u671f\u9759\u6001\u65ad\u8a00\u6821\u9a8c<\/span><br \/>\n    <span class=\"token keyword\">static_assert<\/span><span class=\"token punctuation\">(<\/span>MyTypeList<span class=\"token double-colon punctuation\">::<\/span>size <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7c7b\u578b\u5217\u8868\u6570\u91cf\u9519\u8bef&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">static_assert<\/span><span class=\"token punctuation\">(<\/span>MyValueList<span class=\"token double-colon punctuation\">::<\/span>size <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u503c\u5217\u8868\u6570\u91cf\u9519\u8bef&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u7c7b\u578b\u5217\u8868\u5143\u7d20\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> MyTypeList<span class=\"token double-colon punctuation\">::<\/span>size <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u503c\u5217\u8868\u5143\u7d20\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> MyValueList<span class=\"token double-colon punctuation\">::<\/span>size <span class=\"token operator\">&lt;&lt;<\/span> endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token 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