{"id":90,"date":"2021-05-25T22:41:17","date_gmt":"2021-05-25T14:41:17","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=90"},"modified":"2021-05-26T00:02:41","modified_gmt":"2021-05-25T16:02:41","slug":"%e6%b7%b1%e5%85%a5%e5%ba%94%e7%94%a8c11%e7%ac%94%e8%ae%b0-%e7%ac%ac6%e7%ab%a0","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=90","title":{"rendered":"\u6df1\u5165\u5e94\u7528C++11\u7b14\u8bb0 \u7b2c6\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-6a2cc1e72d574\" 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-6a2cc1e72d574\" 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=90\/#%E4%BD%BF%E7%94%A8C11%E4%B8%AD%E4%BE%BF%E5%88%A9%E7%9A%84%E5%B7%A5%E5%85%B7\" >\u4f7f\u7528C++11\u4e2d\u4fbf\u5229\u7684\u5de5\u5177<\/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=90\/#%E5%A4%84%E7%90%86%E6%97%A5%E6%9C%9F%E5%92%8C%E6%97%B6%E9%97%B4%E7%9A%84chrono%E5%BA%93\" >\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u7684chrono\u5e93<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=90\/#%E8%AE%B0%E5%BD%95%E6%97%B6%E9%95%BF%E7%9A%84duration\" >\u8bb0\u5f55\u65f6\u957f\u7684duration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=90\/#%E8%A1%A8%E7%A4%BA%E6%97%B6%E9%97%B4%E7%82%B9%E7%9A%84time_point\" >\u8868\u793a\u65f6\u95f4\u70b9\u7684time_point<\/a><\/li><\/ul><\/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=90\/#%E6%95%B0%E5%80%BC%E7%B1%BB%E5%9E%8B%E5%92%8C%E5%AD%97%E7%AC%A6%E4%B8%B2%E7%9A%84%E7%9B%B8%E4%BA%92%E8%BD%AC%E6%8D%A2\" >\u6570\u503c\u7c7b\u578b\u548c\u5b57\u7b26\u4e32\u7684\u76f8\u4e92\u8f6c\u6362<\/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=90\/#%E5%AE%BD%E7%AA%84%E5%AD%97%E7%AC%A6%E8%BD%AC%E6%8D%A2\" >\u5bbd\u7a84\u5b57\u7b26\u8f6c\u6362<\/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%E4%B8%AD%E4%BE%BF%E5%88%A9%E7%9A%84%E5%B7%A5%E5%85%B7\"><\/span>\u4f7f\u7528C++11\u4e2d\u4fbf\u5229\u7684\u5de5\u5177<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%A4%84%E7%90%86%E6%97%A5%E6%9C%9F%E5%92%8C%E6%97%B6%E9%97%B4%E7%9A%84chrono%E5%BA%93\"><\/span>\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u7684chrono\u5e93<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AE%B0%E5%BD%95%E6%97%B6%E9%95%BF%E7%9A%84duration\"><\/span>\u8bb0\u5f55\u65f6\u957f\u7684duration<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>template&lt;\n    class Rep,\n    class Period = std::ratio&lt;1>\n> class duration;\n\ntemplate&lt;\n    std::intmax_t Num,\n    std::intmax_t Denom = 1\n> class ratio;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">duration\u7c7b\u6a21\u677f\u7528\u4e8e\u8868\u793a\u4e00\u6bb5\u65f6\u95f4\u957f\u5ea6\uff0cduration\u6a21\u677f\u7c7b\u4e2d\u4f1a\u4fdd\u5b58\u4e00\u4e2atick\u6570\uff0ctick\u6570\u7684\u7c7b\u578b\u4e3aRep\u7c7b\u578b\uff0c\u6bcf\u4e2atick\u4ee3\u8868\u7684\u65f6\u95f4\u957f\u5ea6\u4e3aPeriod\u6307\u5b9a\u7684\u79d2\u6570\uff0cPeriod\u662f\u4e00\u4e2aratio\u5f62\u5f0f\u7684\u5206\u6570\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u4e0bchrono\u547d\u540d\u7a7a\u95f4\u4e2d\uff0c\u5404\u4e2a\u65f6\u95f4\u5355\u4f4d\u662f\u600e\u4e48\u5b9a\u4e49\u7684\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>typedef duration&lt;Rep, ratio&lt;3600, 1>> hours;\ntypedef duration&lt;Rep, ratio&lt;60, 1>> minutes;\ntypedef duration&lt;Rep, ratio&lt;1, 1>> seconds;\ntypedef duration&lt;Rep, ratio&lt;1, 1000>> milliseconds;\ntypedef duration&lt;Rep, ratio&lt;1, 1000000>> microseconds;\ntypedef duration&lt;Rep, ratio&lt;1, 1000000000>> nanoseconds;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">duration\u4e2d\u4fdd\u5b58\u7684tick\u6570\u53ef\u4ee5\u901a\u8fc7count()\u65b9\u6cd5\u83b7\u5f97\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u540c\u5355\u4f4d\u7684duration\u7c7b\u578b\u4e4b\u95f4\u53ef\u4ee5\u76f8\u52a0\u51cf\u548c\u4e92\u76f8\u8f6c\u6362\uff0c\u76f8\u52a0\u51cf\u65f6\uff0c\u5355\u4f4d\u5c31\u7edf\u4e00\u6210\u4e24\u4e2a\u64cd\u4f5c\u6570\u7684\u5355\u4f4d\u7684\u201c\u5206\u6570\u5f62\u5f0f&#8221;\u7684\u6700\u5c0f\u516c\u7ea6\u6570\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%A1%A8%E7%A4%BA%E6%97%B6%E9%97%B4%E7%82%B9%E7%9A%84time_point\"><\/span>\u8868\u793a\u65f6\u95f4\u70b9\u7684time_point<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>template&lt;\n    class Clock,\n    class Duration = typename Clock::duration\n> class time_point;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2atime_point\u5176\u5b9e\u548cclock_gettime\u5f88\u50cf\uff0c\u9009\u53d6\u4e00\u79cd\u65f6\u949fClock\uff0c\u7136\u540e\u901a\u8fc7time_since_epoch\u65b9\u6cd5\u83b7\u53d6\u81ea\u8be5\u65f6\u949f\u7684Epoch\u5f00\u59cb\u8fc7\u53bb\u4e86\u591a\u957f\u65f6\u95f4\uff0c\u53ea\u4e0d\u8fc7time_point\u8fd4\u56de\u7684\u7c7b\u578b\u662fduration\u800c\u5df2(\u5982\u679c\u6ca1\u6709\u5728\u6a21\u677f\u53c2\u6570\u4e2d\u6307\u5b9aduration\u7c7b\u578b\uff0c\u90a3\u4e48\u5c31\u7528\u6307\u5b9a\u7684\u65f6\u949fClock\u4e2d\u7684duration\u7c7b\u578b)\u3002\u548cclock_gettime\u8fd4\u56de\u7684timespec\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8etime_point\u628a\u65f6\u949f\u7c7b\u578b\u4e5f\u4e00\u8d77\u4fdd\u5b58\u5728\u8fd9\u4e2a\u503c\u91cc\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Clock\u7684\u7c7b\u578b\u53ef\u4ee5\u9009\u62e9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>system_clock\uff0c\u7c7b\u6bd4clock_gettime\u4e2d\u7684CLOCK_REALTIME<\/li><li>steady_clock\uff0c\u7c7b\u6bd4clock_gettime\u4e2d\u7684CLOCK_MONOTONIC<\/li><li>high_resolution_clock\uff0c\u7cfb\u7edf\u652f\u6301\u7684\u6700\u9ad8\u7cbe\u5ea6\u7684\u65f6\u949f\u7c7b\u578b\uff0c\u53ef\u80fd\u5c31\u662fsystem_clock\u6216\u8005steady_clock\uff0c\u4e5f\u53ef\u80fd\u662f\u5176\u4ed6\u7684\u65f6\u949f\u5b9e\u73b0<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Clock\u7684\u6210\u5458\u51fd\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>now\uff0c\u8fd4\u56de\u4e00\u4e2a\u4ee3\u8868\u5f53\u524d\u65f6\u95f4\u70b9\u7684time_point\uff1b<\/li><li>to_time_t\uff0c\u5c06time_point\u8f6c\u6362\u4e3atime_t\uff1b<\/li><li>from_time_t\uff0c\u5c06time_t\u8f6c\u6362\u4e3atime_point\uff1b<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u4e00\u4e2a\u65f6\u949f\u7684time_point\u53ef\u4ee5\u76f8\u51cf\uff0c\u4e0d\u540c\u65f6\u949f\u7684time_point\u4e0d\u53ef\u4ee5\u8fdb\u884c\u76f8\u51cf\u8fd0\u7b97\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%95%B0%E5%80%BC%E7%B1%BB%E5%9E%8B%E5%92%8C%E5%AD%97%E7%AC%A6%E4%B8%B2%E7%9A%84%E7%9B%B8%E4%BA%92%E8%BD%AC%E6%8D%A2\"><\/span>\u6570\u503c\u7c7b\u578b\u548c\u5b57\u7b26\u4e32\u7684\u76f8\u4e92\u8f6c\u6362<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6570\u5b57\u8f6c\u5b57\u7b26\u4e32\uff1astd::to_string\u548cstd::to_wstring\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b57\u7b26\u4e32\u8f6c\u6570\u7ec4\uff1a\u4f5c\u8005\u5c45\u7136\u53ea\u8bb2\u4e86C\u91cc\u9762\u5c31\u6709\u7684atoi\uff0catol\uff0catoll\uff0catof\u8fd9\u4e9b\uff0c\u6ca1\u6709\u8bb2std::stoi\uff0cstd::stol\uff0cstd::stoul\uff0cstd::stoll\u8fd9\u4e9b\u51fd\u6570\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%AE%BD%E7%AA%84%E5%AD%97%E7%AC%A6%E8%BD%AC%E6%8D%A2\"><\/span>\u5bbd\u7a84\u5b57\u7b26\u8f6c\u6362<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Unicode\uff0cUTF8\uff0c\u5bbd\u5b57\u7b26\u50bb\u50bb\u5206\u4e0d\u6e05\u695a\u3002\u9700\u8981\u5148\u4ed4\u7ec6\u5b66\u4e60\u4e00\u4e0b\u8fd9\u4e9b\u6982\u5ff5\u5148:)\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528C++11\u4e2d\u4fbf\u5229\u7684\u5de5\u5177 \u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u7684chrono\u5e93 \u8bb0\u5f55\u65f6\u957f\u7684duration duration\u7c7b\u6a21\u677f\u7528\u4e8e\u8868\u793a\u4e00\u6bb5\u65f6\u95f4\u957f\u5ea6\uff0cduration\u6a21\u677f\u7c7b\u4e2d\u4f1a\u4fdd\u5b58\u4e00\u4e2atick\u6570\uff0ctick\u6570\u7684\u7c7b\u578b\u4e3aRe&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[8,7,9],"class_list":["post-90","post","type-post","status-publish","format-standard","hentry","category-10","tag-c","tag-c11","tag-9"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/90","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=90"}],"version-history":[{"count":4,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/90\/revisions"}],"predecessor-version":[{"id":95,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/90\/revisions\/95"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=90"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=90"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=90"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}