99 lines
5.9 KiB
HTML
99 lines
5.9 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::chrono::sys_info</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_sys_info skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>sys_info</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<div>定义于头文件 <code><a href="cpp-header-chrono.html"><chrono></a></code></div>
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</td>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">struct</span> sys_info<span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td></td>
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<p>类 <code>sys_info</code> 描述与在特定时间点（表示为 <span class="t-lc">std::chrono::sys_time</span> 或 <span class="t-lc">std::chrono::local_time</span> ）关联的时区信息。这是低层数据结构，通常不为用户代码所用。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.AF.B9.E8.B1.A1">成员对象</span></h3>
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<table class="t-dsc-begin">
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<td>成员对象</td>
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<td>类型</td>
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<tr class="t-dsc">
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<td><code>begin</code>, <code>end</code></td>
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<td><span class="t-lc">std::chrono::sys_seconds</span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>offset</code></td>
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<td><span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::seconds</a></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>save</code></td>
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<td><span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::minutes</a></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>abbrev</code></td>
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<td><span class="t-lc"><a href="cpp-string-basic_string.html">std::string</a></span></td>
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</table>
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<p><code>begin</code> 和 <code>end</code> 数据成员指示范围 <code>[begin, end)</code> ——其中 <code>offset</code> 和 <code>abbrev</code> 对与此 <code>sys_info</code> 关联的时区有效。</p>
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<p><code>offset</code> 和 <code>abbrev</code> 数据成员分别指示 UTC 偏移和时区缩写，对于关联的时区和 <span class="t-lc"><a href="cpp-chrono-time_point.html">std::chrono::time_point</a></span> 有效。注意时区缩写不是独有的。</p>
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<p><code>save</code> 数据成员，若非零则指示在指定时间点时区处于夏时令。该情况下， <span class="t-c"><span class="mw-geshi cpp source-cpp">offset <span class="sy2">-</span> save</span></span> 是假设无夏时令则，此时区会使用的偏移的建议。然而此信息不可靠：确认实际偏移的仅有方式是确实无夏时令（即返回 <code>sys_info</code> 使得 <span class="t-c"><span class="mw-geshi cpp source-cpp">save <span class="sy1">==</span> 0min</span></span> ）。</p>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-chrono-sys_info-operator_ltlt.html"><span class="t-lines"><span>operator<<</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>输出 <code>sys_info</code> 到流中<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-chrono-sys_info-formatter.html"><span class="t-lines"><span>std::formatter<span class="t-dsc-small"><std::chrono::sys_info></span></span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td><span class="t-lc">std::formatter</span> 的特化，按照提供的格式格式化 <code>sys_info</code><br />
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<span class="t-mark">(类模板特化)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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