{"id":1619,"date":"2018-08-21T19:43:51","date_gmt":"2018-08-21T11:43:51","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1619"},"modified":"2018-08-21T19:43:51","modified_gmt":"2018-08-21T11:43:51","slug":"cowcopy-on-write%ef%bc%8c-sso-small-string-optimization%e6%b5%85%e6%9e%90","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1619","title":{"rendered":"COW(copy on write)\uff0c SSO (small string optimization)\u6d45\u6790"},"content":{"rendered":"<div class=\"article-header-box\">\n<div class=\"article-header\">\n<div class=\"article-title-box\">\n<h1 class=\"title-article\">COW(copy on write)\uff0c SSO (small string optimization)\u6d45\u6790<\/h1>\n<\/div>\n<div class=\"article-info-box\">\n<div class=\"article-bar-top d-flex\"><span class=\"time\">2017\u5e7411\u670820\u65e5 14:58:21<\/span><\/p>\n<div class=\"float-right\"><span class=\"read-count\">\u9605\u8bfb\u6570\uff1a259<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<article>\n<div id=\"article_content\" class=\"article_content clearfix csdn-tracking-statistics\" data-pid=\"blog\" data-mod=\"popu_307\" data-dsm=\"post\">\n<div class=\"htmledit_views\">\n<p>\u6709\u5982\u4e0b\u4e00\u6bb5\u4ee3\u7801\uff0c \u5219\u8f93\u51fa\u7ed3\u679c\u662f\uff1f<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/img-blog.csdn.net\/20171120142157563\" alt=\"\" \/><\/p>\n<p>\u4e0d\u4e00\u6837\u7684\u7f16\u8bd1\u5668\u53ef\u80fd\u4f1a\u6709\u4e0d\u4e00\u6837\u7684\u7ed3\u679c\uff0c\u539f\u56e0\u5728\u4e8e\u6240\u4f7f\u7528\u7684\u5f15\u7528\u8ba1\u6570\u65b9\u6cd5\u662fCOW\u8fd8\u662fSSO\u3002\u6bd4\u5982VS\u4e0a\u7ed3\u679c\u662ffalse, false, false, \u800c\u8001\u7248\u672cGCC\u4e0a\u5219\u662ftrue, true, false\uff0c\u56e0trs\u4e3aSTL\u6807\u51c6\u5e93\u5bf9string\u7684\u5b9e\u73b0\u65b9\u6cd5\u4e0d\u540c\u3002<\/p>\n<p>\u9996\u5148\u8981\u660e\u786e\u4e00\u70b9\uff0c\u76ee\u524d\u7684\u5b9e\u73b0\u4e2d\uff0c\u4e0d\u7ba1\u54ea\u79cd\u65b9\u5f0fstring\u7684\u62f7\u8d1d\u662f\u6df1\u62f7\u8d1d\u7684\u3002\u4f46\u662f\u5982\u679c\u6bcf\u6b21\u90fd\u662f\u91cd\u65b0new\u4e00\u4e2a\u5bf9\u8c61\uff0c\u7136\u540e\u628a\u6570\u636e\u590d\u5236\u8fc7\u53bb\uff0c\u6548\u7387\u4f1a\u5f88\u4f4e\u3002\u4e8e\u662f\u5c31\u6709\u4e86\u4fe9\u79cd\u4f18\u5316\u65b9\u6848\u3002<\/p>\n<p><strong>1. COW<\/strong><\/p>\n<p>\u601d\u60f3\u662f\u53ea\u6709\u5f53\u4fee\u6539string\u7684\u65f6\u5019\u518d\u4e3a\u8fd9\u4e2a\u4fee\u6539\u64cd\u4f5c\u91cd\u65b0\u751f\u6210\u4e00\u4e2a\u62f7\u8d1d\uff0c\u5982\u679c\u53ea\u662f\u590d\u5236\uff0c\u90a3\u4e48\u5c31\u662f\u5171\u4eab\u8fd9\u4e2a\u6570\u636e\u3002COW\u7684\u5b9e\u73b0\u673a\u5236\u662f\u7528\u4e00\u4e2a\u5f15\u7528\u8ba1\u6570\uff0c\u521d\u59cb\u503c\u662f1\uff0c\u6bcf\u6b21\u8d4b\u503c\u7684\u65f6\u5019\u90fd\u4f1a\u52a01\u3002\u5f53\u4fee\u6539\u7684\u65f6\u5019\uff0c\u5982\u679ccount &gt; 1\uff0c \u5219\u4f1a\u91cd\u65b0\u7533\u8bf7\u7a7a\u95f4\u5e76\u590d\u5236\uff0c\u5e76\u4e14count&#8211;\uff08\u56e0\u4e3a\u6b63\u5728\u4fee\u6539\u7684\u8fd9\u4e2a\u4e4b\u524d\u80af\u5b9a\u662f\u5f15\u7528\u4e86\u8fd9\u4e2a\u6570\u636e\uff09\uff0c\u7136\u540e\u5982\u679ccount = 0\uff0c \u5219\u91ca\u653e\u539f\u6765\u5185\u5b58\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cstring\u4f1a\u628a[]\u8ddfat()\u64cd\u4f5c\u8ba4\u5b9a\u4e3a\u4fee\u6539\u64cd\u4f5c\uff0c\u56e0\u4e3a\u5f88\u96be\u5b9a\u4e49\u5230\u5e95\u662f\u4e0d\u662f\u4fee\u6539\uff0c\u6240\u4ee5\u4e00\u5f8b\u5f53\u6210\u4e86\u4fee\u6539\u3002\u6bd4\u5982\u4ee5\u4e0b\u7684\u4ee3\u7801\uff0cstring a = &#8220;hi&#8221;, string b = a; b[0] = &#8216;i&#8217;;<\/p>\n<p>\u5219a= &#8220;hi&#8221;, b=&#8221;ii&#8221;.<\/p>\n<p><strong>2. SSO<\/strong><\/p>\n<p>\u56e0\u4e3aCOW\u7684\u5f0a\u7aef\uff08\u9664\u4e86\u4e0a\u9762\u63d0\u5230\u7684\uff0c\u8fd8\u6709\u5176\u4ed6\u7684\uff0c\u6bd4\u5982\u591a\u7ebf\u7a0b\u95ee\u9898\uff09\uff0c\u65b0\u7248\u672c\u7684\u7f16\u8bd1\u5668\u5927\u591a\u653e\u5f03\u4e86COW\uff0c\u800c\u4f7f\u7528\u4e86SSO\u3002SSO\u601d\u60f3\u662f\u7acb\u523b\u590d\u5236\uff0c\u540c\u65f6\u6709\u4e00\u4e2a\u4f18\u5316\u5c31\u662f<strong>\u5f53\u5b57\u7b26\u4e32\u8f83\u77ed\u65f6\uff0c\u76f4\u63a5\u5c06\u5176\u6570\u636e\u653e\u5230\u6808\u4e2d\uff0c\u800c\u4e0d\u662f\u5728\u5806\u4e2d\u52a8\u6001\u7533\u8bf7\u5185\u5b58<\/strong>\uff0c\u907f\u514d\u4e86\u7533\u8bf7\u7a7a\u95f4\u7684\u5f00\u9500\u3002<\/p>\n<p>\u56de\u5230\u5f00\u5934\u7684\u4f8b\u5b50\uff0c\u5c31\u4e0d\u96be\u7406\u89e3\u4e3a\u4ec0\u4e48VS\u4f1a\u8f93\u51fafalse, false, false\u4e86\uff0c\u56e0\u4e3a\u6bcf\u6b21\u90fd\u662f\u6df1\u62f7\u8d1d\u3002<\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>COW(copy on write)\uff0c <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-1619","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1619","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=1619"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1619\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=1619"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=1619"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=1619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}