{"id":2027,"date":"2023-01-09T17:03:46","date_gmt":"2023-01-09T09:03:46","guid":{"rendered":"https:\/\/courtship.top\/?p=2027"},"modified":"2023-01-09T17:03:46","modified_gmt":"2023-01-09T09:03:46","slug":"%e6%a8%a1%e6%9d%bf%e5%85%b3%e9%94%ae%e5%ad%97typename%e7%9a%84%e7%94%b1%e6%9d%a5%e5%92%8c%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/courtship.top\/index.php\/2023\/01\/09\/%e6%a8%a1%e6%9d%bf%e5%85%b3%e9%94%ae%e5%ad%97typename%e7%9a%84%e7%94%b1%e6%9d%a5%e5%92%8c%e7%94%a8%e6%b3%95\/","title":{"rendered":"\u6a21\u677f\u5173\u952e\u5b57typename\u7684\u7531\u6765\u548c\u7528\u6cd5"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u539f\u6587\u5f88\u6e05\u695a\u7684\u8bb2\u6e05\u695a\u4e86typename\u7684\u5386\u53f2\uff0c\u7279\u6b64\u8f6c\u8f7d<\/p>\n<cite>http:\/\/t.csdn.cn\/385RU<\/cite><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9a\u4e49<\/h2>\n\n\n\n<p><strong>\"typename\"\u662f\u4e00\u4e2aC++\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u4e2d\u7684\u5173\u952e\u5b57\u3002\u5f53\u7528\u4e8e\u6cdb\u578b\u7f16\u7a0b\u65f6\u662f\u53e6\u4e00\u672f\u8bed\"class\"\u7684\u540c\u4e49\u8bcd\u3002\u8fd9\u4e2a\u5173\u952e\u5b57\u7528\u4e8e\u6307\u51fa\u6a21\u677f\u58f0\u660e\uff08\u6216\u5b9a\u4e49\uff09\u4e2d\u7684\u975e\u72ec\u7acb\u540d\u79f0\uff08dependent names\uff09\u662f\u7c7b\u578b\u540d\uff0c\u800c\u975e\u53d8\u91cf\u540d\u3002<\/strong><\/p>\n\n\n\n<p><strong>\u5728\u6a21\u677f\u5b9a\u4e49\u8bed\u6cd5\u4e2d\u5173\u952e\u5b57class\u548ctypename\u7684\u4f5c\u7528\u5b8c\u5168\u4e00\u81f4<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>template\nconst T&amp; max(const T&amp; x, const T&amp; y)\n{\n    if (y &lt; x) {\n        return x;\n    }\n    return y;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48\u4f1a\u540c\u65f6\u5b58\u5728class\u548ctypename\u4e14\u4ed6\u4eec\u4f5c\u7528\u76f8\u540c\uff1f<\/h2>\n\n\n\n<p>\u8fd9\u91cc class \u5173\u952e\u5b57\u8868\u660eT\u662f\u4e00\u4e2a\u7c7b\u578b\uff0c\u540e\u6765\u4e3a\u4e86\u907f\u514d class \u5728\u8fd9\u4e24\u4e2a\u5730\u65b9\u7684\u4f7f\u7528\u53ef\u80fd\u7ed9\u4eba\u5e26\u6765\u6df7\u6dc6\uff0c\u6240\u4ee5\u5f15\u5165\u4e86 typename \u8fd9\u4e2a\u5173\u952e\u5b57\uff0c\u5b83\u7684\u4f5c\u7528\u540c class \u4e00\u6837\u8868\u660e\u540e\u9762\u7684\u7b26\u53f7\u4e3a\u4e00\u4e2a\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u90a3class\u4f7f\u7528\u5c31\u591f\u4e86\uff0c\u4e3a\u4ec0\u4e48\u53c8\u5f15\u5165\u4e86\u65b0\u7684\u5173\u952e\u8bcd typename \uff0c\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0cStan Lippman \u66fe\u5728\u5176\u535a\u5ba2\u4e2d\u8868\u793a\uff0c<strong>\u6700\u65e9 Stroustrup \u4f7f\u7528 class \u6765\u58f0\u660e\u6a21\u677f\u53c2\u6570\u5217\u8868\u4e2d\u7684\u7c7b\u578b\u662f\u4e3a\u4e86\u907f\u514d\u589e\u52a0\u4e0d\u5fc5\u8981\u7684\u5173\u952e\u5b57\uff1b\u540e\u6765\u59d4\u5458\u4f1a\u8ba4\u4e3a\u8fd9\u6837\u6df7\u7528\u53ef\u80fd\u9020\u6210\u6982\u5ff5\u4e0a\u7684\u6df7\u6dc6\u624d\u52a0\u4e0a\u4e86 typename \u5173\u952e\u5b57\u3002<\/strong>     <\/p>\n\n\n\n<p>\u800c\u4f7f\u7528 typename \u7684\u4f5c\u7528\u5c31\u662f\u544a\u8bc9 c++ \u7f16\u8bd1\u5668\uff0ctypename \u540e\u9762\u7684\u5b57\u7b26\u4e32\u4e3a\u4e00\u4e2a\u7c7b\u578b\u540d\u79f0\uff0c\u800c\u4e0d\u662f\u6210\u5458\u51fd\u6570\u6216\u8005\u6210\u5458\u53d8\u91cf\uff0c\u8fd9\u4e2a\u65f6\u5019\u5982\u679c\u524d\u9762\u6ca1\u6709 typename\uff0c\u7f16\u8bd1\u5668\u6ca1\u6709\u4efb\u4f55\u529e\u6cd5\u77e5\u9053 T::LengthType \u662f\u4e00\u4e2a\u7c7b\u578b\u8fd8\u662f\u4e00\u4e2a\u6210\u5458\u540d\u79f0(\u9759\u6001\u6570\u636e\u6210\u5458\u6216\u8005\u9759\u6001\u51fd\u6570)\uff0c\u6240\u4ee5\u7f16\u8bd1\u4e0d\u80fd\u591f\u901a\u8fc7\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C++\u6807\u51c6\u505a\u51fa\u7684\u6539\u53d8<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6d88\u9664\u6b67\u4e49\uff08:\u00a0: \u4e8c\u4e49\u6027\u7684\u89e3\u51b3\uff09<\/h3>\n\n\n\n<p>\u5bf9\u4e8e\u7528\u4e8e\u6a21\u677f\u5b9a\u4e49\u7684\u4f9d\u8d56\u4e8e\u6a21\u677f\u53c2\u6570\u7684\u540d\u79f0\uff0c\u53ea\u6709\u5728\u5b9e\u4f8b\u5316\u7684\u53c2\u6570\u4e2d\u5b58\u5728\u8fd9\u4e2a\u7c7b\u578b\u540d\uff0c\u6216\u8005\u8fd9\u4e2a\u540d\u79f0\u524d\u4f7f\u7528\u4e86 typename \u5173\u952e\u5b57\u6765\u4fee\u9970\uff0c\u7f16\u8bd1\u5668\u624d\u4f1a\u5c06\u8be5\u540d\u79f0\u5f53\u6210\u662f\u7c7b\u578b\u3002\u9664\u4e86\u4ee5\u4e0a\u8fd9\u4e24\u79cd\u60c5\u51b5\uff0c\u7edd\u4e0d\u4f1a\u88ab\u5f53\u6210\u662f\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5982\u679c\u4f60\u60f3\u76f4\u63a5\u544a\u8bc9\u7f16\u8bd1\u5668 T::const_iterator \u662f\u7c7b\u578b\u800c\u4e0d\u662f\u53d8\u91cf\uff0c\u53ea\u9700\u7528 typename\u4fee\u9970<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>typename T::const_iterator it(proto.begin());<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6837\u7f16\u8bd1\u5668\u5c31\u53ef\u4ee5\u786e\u5b9aT::const_iterator\u662f\u4e00\u4e2a\u7c7b\u578b\uff0c\u800c\u4e0d\u518d\u9700\u8981\u7b49\u5230\u5b9e\u4f8b\u5316\u65f6\u671f\u624d\u80fd\u786e\u5b9a\uff0c\u56e0\u6b64\u6d88\u9664\u4e86\u524d\u9762\u63d0\u5230\u7684\u6b67\u4e49\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5d4c\u5957\u4ece\u5c5e\u7c7b\u578b<\/h3>\n\n\n\n<p>\u4e8b\u5b9e\u4e0a\u7c7b\u578bT::const_iterator\u4f9d\u8d56\u4e8e\u6a21\u677f\u53c2\u6570T\uff0c <strong>\u6a21\u677f\u4e2d\u4f9d\u8d56\u4e8e\u6a21\u677f\u53c2\u6570\u7684\u540d\u79f0\u79f0\u4e3a\u4ece\u5c5e\u540d\u79f0\uff08dependent name\uff09<\/strong>\uff0c<strong> \u5f53\u4e00\u4e2a\u4ece\u5c5e\u540d\u79f0\u5d4c\u5957\u5728\u4e00\u4e2a\u7c7b\u91cc\u9762\u65f6\uff0c\u79f0\u4e3a\u5d4c\u5957\u4ece\u5c5e\u540d\u79f0\uff08nested dependent name\uff09<\/strong>\u3002 \u5176\u5b9eT::const_iterator\u8fd8\u662f\u4e00\u4e2a\u5d4c\u5957\u4ece\u5c5e\u7c7b\u578b\u540d\u79f0\uff08nested dependent type name\uff09\u3002<\/p>\n\n\n\n<p>\u5d4c\u5957\u4ece\u5c5e\u540d\u79f0\u662f\u9700\u8981\u7528typename\u58f0\u660e\u7684\uff0c\u5176\u4ed6\u7684\u540d\u79f0\u662f\u4e0d\u53ef\u4ee5\u7528typename\u58f0\u660e\u7684\u3002\u6bd4\u5982\u4e0b\u9762\u662f\u4e00\u4e2a\u5408\u6cd5\u7684\u58f0\u660e\uff1a<br \/><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>template&lt;typename T&gt;\nvoid fun(const T&amp; proto ,typename T::const_iterator it);<\/code><\/pre>\n\n\n\n<p>\u5728\u5b9a\u4e49\u7c7b\u6a21\u677f\u6216\u8005\u51fd\u6570\u6a21\u677f\u65f6\uff0ctypename&nbsp;\u548c&nbsp;class&nbsp;\u5173\u952e\u5b57\u90fd\u53ef\u4ee5\u7528\u4e8e\u6307\u5b9a\u6a21\u677f\u53c2\u6570\u4e2d\u7684\u7c7b\u578b\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u4ee5\u4e0b\u4e24\u79cd\u7528\u6cd5\u662f\u5b8c\u5168\u7b49\u4ef7\u7684\u3002<\/p>\n\n\n\n<p>\u65e2\u7136typename\u5173\u952e\u5b57\u5df2\u7ecf\u5b58\u5728\uff0c\u800c\u4e14\u5b83\u4e5f\u53ef\u4ee5\u7528\u4e8e\u6700\u5e38\u89c1\u7684\u6307\u5b9a\u6a21\u677f\u53c2\u6570\uff0c\u90a3\u4e48\u4e3a\u4ec0\u4e48\u4e0d\u5e9f\u9664class\u8fd9\u4e00\u7528\u6cd5\u5462\uff1f\u7b54\u6848\u5176\u5b9e\u4e5f\u5f88\u660e\u663e\uff0c\u56e0\u4e3a\u5728\u6700\u7ec8\u7684\u6807\u51c6\u51fa\u6765\u4e4b\u524d\uff0c\u6240\u6709\u5df2\u5b58\u5728\u7684\u4e66\u3001\u6587\u7ae0\u3001\u6559\u5b66\u3001\u4ee3\u7801\u4e2d\u90fd\u662f\u4f7f\u7528\u7684\u662fclass\uff0c\u53ef\u4ee5\u60f3\u50cf\uff0c\u5982\u679c\u6807\u51c6\u4e0d\u518d\u652f\u6301class\uff0c\u4f1a\u51fa\u73b0\u4ec0\u4e48\u60c5\u51b5\u3002<\/p>\n\n\n\n<p><strong>\u4f7f\u7528\u5173\u952e\u5b57typename\u4ee3\u66ff\u5173\u952e\u5b57class\u6307\u5b9a\u6a21\u677f\u7c7b\u578b\u5f62\u53c2\u66f4\u4e3a\u76f4\u89c2\uff0c\u6bd5\u7adf\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7c7b\u578b\uff08\u975e\u7c7b\u7c7b\u578b\uff09\u4f5c\u4e3a\u5b9e\u9645\u7684\u7c7b\u578b\u5f62\u53c2\uff0c\u800c\u4e14\uff0ctypename\u66f4\u6e05\u695a\u5730\u6307\u660e\u540e\u9762\u7684\u540d\u5b57\u662f\u4e00\u4e2a\u7c7b\u578b\u540d\u3002<\/strong>\u4f46\u662f\uff0c\u5173\u952e\u5b57typename\u662f\u4f5c\u4e3a\u6807\u51c6C++\u7684\u7ec4\u6210\u90e8\u5206\u52a0\u5165\u5230C++\u4e2d\u7684\uff0c\u56e0\u6b64\u65e7\u7684\u7a0b\u5e8f\u66f4\u6709\u53ef\u80fd\u53ea\u7528\u5173\u952e\u5b57class\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5f88\u6e05\u695a\u7684\u8bb2\u6e05\u695a\u4e86typename\u7684\u5386\u53f2\uff0c\u7279\u6b64\u8f6c\u8f7d http:\/\/t.csdn.cn\/385RU \u5b9a\u4e49 &#8220;typename&#8221;\u662f\u4e00 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-2027","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/2027","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/comments?post=2027"}],"version-history":[{"count":0,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/2027\/revisions"}],"wp:attachment":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/media?parent=2027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/categories?post=2027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/tags?post=2027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}