239 lines
16 KiB
HTML
239 lines
16 KiB
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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<title>std::chrono::nonexistent_local_time</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_nonexistent_local_time skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>nonexistent_local_time</h1>
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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>定义于头文件 <code><a href="cpp-header-chrono.html"><chrono></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> nonexistent_local_time<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>定义要作为异常抛出的对象类型，以报告试图转换不存在的 <span class="t-lc">std::chrono::local_time</span> 为 <span class="t-lc">std::chrono::sys_time</span> 而不指定 <span class="t-lc">std::chrono::choose</span> （如 <code>choose::earliest</code> 或 <code>choose::latest</code> ）。</p>
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<p><span class="t-lc">std::chrono::time_zone::to_sys</span> 和调用它的函数（例如接收 <span class="t-lc">std::chrono::zoned_time</span> 的 <span class="t-lc">std::chrono::local_time</span> 构造函数）抛出此异常。</p>
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<div class="noresize" style="height: 40px; width: 426px;"><map name="ImageMap_1_1850364064" id="ImageMap_1_1850364064">
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<area href="cpp-error-runtime_error.html" shape="rect" coords="134,4,237,36" alt="cpp/error/runtime error" /></map><img alt="std-chrono-nonexistent local time-inheritance.svg" src="std-chrono-nonexistent_local_time-inheritance.svg" width="426" height="40" usemap="#ImageMap_1_1850364064" /></div>
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<p><span style="font-size:0.7em; line-height:130%">继承图</span></p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><span class="t-lines"><span>(构造函数)</span></span></div>
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</td>
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<td>构造异常对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><span class="t-lines"><span>operator=</span></span></div>
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<td>替换异常对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span>what</span></span></div>
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</td>
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<td>返回解释字符串<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</table>
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<div class="t-member">
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<h2><span class="mw-headline" id="std::chrono::nonexistent_local_time::nonexistent_local_time"><span style="font-size:0.7em; line-height:130%">std::chrono::nonexistent_local_time::</span>nonexistent_local_time</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Duration <span class="sy1">></span><br /></span>
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<p>nonexistent_local_time<span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_time</span><span class="sy1"><</span>Duration<span class="sy1">></span><span class="sy3">&</span> tp,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_info</span><span class="sy3">&</span> i <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">nonexistent_local_time<span class="br0">(</span> <span class="kw4">const</span> nonexistent_local_time<span class="sy3">&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<p>构造异常对象。</p>
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<div class="t-li1"><span class="t-li">1)</span> <code>what()</code> 所返回的解释字符串等价于下列代码后 <code>os.str()</code> 所产生者：</div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><a href="cpp-io-basic_ostringstream.html"><span class="kw1736">std::<span class="me2">ostringstream</span></span></a> os<span class="sy4">;</span>
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os <span class="sy1"><<</span> tp <span class="sy1"><<</span> <span class="st0">" is in a gap between<span class="es1">\n</span>"</span>
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<span class="sy1"><<</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_seconds</span><span class="br0">(</span>i.<span class="me1">first</span>.<span class="me1">end</span>.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">+</span> i.<span class="me1">first</span>.<span class="me1">offset</span>
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<span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> i.<span class="me1">first</span>.<span class="me1">abbrev</span> <span class="sy1"><<</span> <span class="st0">" and<span class="es1">\n</span>"</span>
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<span class="sy1"><<</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_seconds</span><span class="br0">(</span>i.<span class="me1">second</span>.<span class="me1">begin</span>.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">+</span> i.<span class="me1">second</span>.<span class="me1">offset</span>
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<span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> i.<span class="me1">second</span>.<span class="me1">abbrev</span>
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<span class="sy1"><<</span> <span class="st0">" which are both equivalent to<span class="es1">\n</span>"</span>
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<span class="sy1"><<</span> i.<span class="me1">first</span>.<span class="me1">end</span> <span class="sy1"><<</span> <span class="st0">" UTC"</span><span class="sy4">;</span></pre></div>
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</div>
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<div class="t-li1"><span class="t-li"></span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">i.<span class="me1">result</span> <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_info</span><span class="sy4">::</span><span class="me2">nonexistent</span></span></span> 则行为未定义。</div>
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<div class="t-li1"><span class="t-li">2)</span> 复制构造函数。若 <code>*this</code> 与 <code>other</code> 均拥有动态类型 <code>std::chrono::nonexistent_local_time</code> 则 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-byte-strcmp.html"><span class="kw1146">std::<span class="me2">strcmp</span></span></a><span class="br0">(</span>what<span class="br0">(</span><span class="br0">)</span>, other.<span class="me1">what</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>tp</td>
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<td>-</td>
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<td>试图转换的时间点</td>
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<tr class="t-par">
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<td>i</td>
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<td>-</td>
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<td>描述转换尝试的结果的 <span class="t-lc">std::chrono::local_info</span></td>
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<tr class="t-par">
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<td>other</td>
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<td>-</td>
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<td>要复制的另一 <code>nonexistent_local_time</code></td>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>可能抛出 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span></p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>因为不容许复制派生自 <code>std::exception</code> 的标准库类抛出异常，此信息通常在内部存储为分离分配的引用计数字符串。</p>
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<h2><span class="mw-headline" id="std::chrono::nonexistent_locale_time::operator.3D"><span style="font-size:0.7em; line-height:130%">std::chrono::nonexistent_locale_time::</span>operator=</span></h2>
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<div><span class="mw-geshi cpp source-cpp">nonexistent_locale_time<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> nonexistent_locale_time<span class="sy3">&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><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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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<p>以 <code>other</code> 的内容赋值。若 <code>*this</code> 与 <code>other</code> 均拥有动态类型 <code>std::chrono::nonexistent_locale_time</code> 则赋值后 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-byte-strcmp.html"><span class="kw1146">std::<span class="me2">strcmp</span></span></a><span class="br0">(</span>what<span class="br0">(</span><span class="br0">)</span>, other.<span class="me1">what</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0_2">参数</span></h3>
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<table class="t-par-begin">
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<td>other</td>
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<td>-</td>
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<td>用以赋值的另一异常对象</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
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</div>
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<div class="t-member">
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<h2><span class="mw-headline" id="std::chrono::nonexistent_locale_time::what"><span style="font-size:0.7em; line-height:130%">std::chrono::nonexistent_locale_time::</span>what</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> what<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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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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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>返回解释字符串。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0_3">参数</span></h3>
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<p>（无）</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC_2">返回值</span></h3>
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<p>指向有解释信息的空终止字符串的指针。该字符串适合转换并显示为 <span class="t-lc"><a href="cpp-string-basic_string.html">std::wstring</a></span> 。保证该指针至少到获得它来源的异常对象被销毁，或在该异常对象上调用非 const 成员函数（例如复制赋值运算符）为止合法。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3_2">注解</span></h3>
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<p>允许但不要求实现覆写 <code>what()</code> 。</p>
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</div>
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<div class="t-inherited">
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<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::runtime_error">继承自 <a href="cpp-error-runtime_error.html"><span style="font-size:0.7em; line-height:130%">std::</span>runtime_error</a></span></h2>
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<p><br /></p>
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</div>
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<div class="t-inherited">
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<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::exception">继承自 <a href="cpp-error-exception.html"><span style="font-size:0.7em; line-height:130%">std::</span>exception</a></span></h2>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_2">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 t-dsc-member-nobold-div">
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<div><a href="cpp-error-exception-~exception.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>析构该异常对象<br />
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<span class="t-mark">(<code>std::exception</code> 的虚公开成员函数)</span></td>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-error-exception-what.html"><span class="t-lines"><span>what</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>返回解释性字符串<br />
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<span class="t-mark">(<code>std::exception</code> 的虚公开成员函数)</span></td>
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</table>
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</div>
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</div>
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<div class="visualClear"></div>
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