91 lines
6.2 KiB
HTML
91 lines
6.2 KiB
HTML
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<title>std::experimental::ostream_joiner<DelimT,CharT,Traits>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_ostream_joiner_operator 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::experimental::ostream_joiner<DelimT,CharT,Traits>::</span>operator=</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-experimental.html">experimental</a>‎ | <a href="cpp-experimental-ostream_joiner.html">ostream joiner</a></span></div>
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<table class="t-dcl-begin">
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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> T<span class="sy1">></span><br />
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ostream_joiner<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> T<span class="sy3">&</span> value<span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp">ostream_joiner<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> ostream_joiner<span class="sy3">&</span> other<span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</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-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span><br />
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<span class="t-mark">(隐式声明)</span></td>
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<div><span class="mw-geshi cpp source-cpp">ostream_joiner<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>ostream_joiner<span class="sy3">&&</span> other<span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span></span></div>
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</td>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span><br />
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<span class="t-mark">(隐式声明)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>1) 首先，若私有“首元素”标志为 <code>false</code> ，则如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1"><<</span> delim<span class="sy4">;</span></span></span> 插入分隔符 <code>delim</code> 到与此迭代器关联的输出流 <code>os</code> 中。</p>
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<p>然后，无条件地设置“首元素”标志为 <code>false</code> ，然后如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1"><<</span> value<span class="sy4">;</span></span></span> 插入 <code>value</code> 到输出流中。</p>
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<p>令 <code>out_stream</code> 、 <code>delim</code> 和 <code>first_element</code> 分别代表私有流指针、分隔符和“首元素”标志成员，则此函数等价于</p>
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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"><span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>first_element<span class="br0">)</span>
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<span class="sy2">*</span>out_stream <span class="sy1"><<</span> delim<span class="sy4">;</span>
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first_element <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
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<span class="sy2">*</span>out_stream <span class="sy1"><<</span> value<span class="sy4">;</span>
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<span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></pre></div>
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<p>2-3) 隐式声明的复制/移动赋值运算符，复制移动/赋值私有流指针、分隔符和“首元素”标志成员。</p>
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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>value</td>
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<td>-</td>
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<td>要写入到流的对象</td>
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</tr>
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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>要被赋值给此对象的 <code>ostream_joiner</code> 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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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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