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<h1 id="firstHeading" class="firstHeading">operator&lt;&lt;<span style="font-size:0.7em; line-height:130%">(std::basic_ostream)</span></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-io.html">io</a>&lrm; | <a href="cpp-io-basic_ostream.html">basic ostream</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-ostream.html">&lt;ostream&gt;</a></code></div>
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<div><code>basic_ostream</code> &#19982;&#23383;&#31526;</div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits<span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;CharT ch <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits<span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">signed</span> <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">unsigned</span> <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></div>
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<div><code>basic_ostream</code> &#19982;&#23383;&#31526;&#25968;&#32452;</div>
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<td rowspan="142">(2)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> CharT<span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os, &nbsp;<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></div>
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<div><code>basic_ostream</code> &#21491;&#20540;</div>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Ostream, <span class="kw1">class</span> T <span class="sy1">&gt;</span><br /></span>
<p>Ostream<span class="sy3">&amp;&amp;</span> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> Ostream<span class="sy3">&amp;&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> T<span class="sy3">&amp;</span> value <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><code>basic_ostream</code> &#19982; UTF &#23383;&#31526;/&#25968;&#32452;&#30340;&#34987;&#21024;&#38500;&#37325;&#36733;</div>
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<td rowspan="142">(4)</td>
<td rowspan="142"><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">wchar_t</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; char8_t ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
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<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">char16_t</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">char32_t</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
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<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;char8_t ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
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<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">char16_t</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">char32_t</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> char8_t<span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="kw4">char16_t</span><span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="kw4">char32_t</span><span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> char8_t<span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <span class="kw4">char16_t</span><span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p>basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span>,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <span class="kw4">char32_t</span><span class="sy2">*</span> ch <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
</tbody>
<tbody>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
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</tbody>
</table>
<p>&#25554;&#20837;&#23383;&#31526;&#25110;&#23383;&#31526;&#20018;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#34920;&#29616;&#22914;<a href="cpp-named_req-FormattedOutputFunction.html"><span style="font-style:italic">&#26377;&#26684;&#24335;&#36755;&#20986;&#20989;&#25968;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(FormattedOutputFunction)</span></a> &#12290;&#22312;&#26500;&#36896;&#24182;&#26816;&#26597; sentry &#23545;&#35937;&#21518;&#65292;&#25554;&#20837;&#23383;&#31526; <code>ch</code> &#12290;&#33509;&#23383;&#31526;&#31867;&#22411;&#19981;&#26159; <code>CharT</code> &#65292;&#21017;&#23427;&#39318;&#20808;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">os.<span class="me1">widen</span><span class="br0">(</span>ch<span class="br0">)</span></span></span> &#36716;&#25442;&#12290;&#25353;&#19979;&#21015;&#26041;&#24335;&#30830;&#23450;&#22635;&#20805;&#65306;&#33509; <code>os.width()&gt;1</code> &#65292;&#21017;&#28155;&#21152; <code>os.width()-1</code> &#20010; <code>os.fill()</code> &#30340;&#21103;&#26412;&#21040;&#36755;&#20986;&#23383;&#31526;&#65292;&#20197;&#32452;&#25104;&#36755;&#20986;&#23383;&#31526;&#24207;&#21015;&#12290; &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>out.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span><span class="sy3">&amp;</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1686">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">adjustfield</span></span></a><span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1683">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">left</span></span></a></span></span> &#65292;&#21017;&#22635;&#20805;&#23383;&#31526;&#34987;&#32622;&#20110;&#36755;&#20986;&#23383;&#31526;&#20043;&#21518;&#65292;&#21542;&#21017;&#22312;&#20043;&#21069;&#12290;&#25554;&#20837;&#21069;&#65292;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">os.<span class="me1">width</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span></span></span> &#20197;&#21462;&#28040; <span class="t-lc"><a href="cpp-io-manip-setw.html">std::setw</a></span> &#30340;&#25928;&#26524;&#65292;&#33509;&#23427;&#23384;&#22312;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#34920;&#29616;&#22914;<a href="cpp-named_req-FormattedOutputFunction.html"><span style="font-style:italic">&#26377;&#26684;&#24335;&#36755;&#20986;&#20989;&#25968;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(FormattedOutputFunction)</span></a> &#12290;&#22312;&#26500;&#36896;&#24182;&#26816;&#26597; sentry &#23545;&#35937;&#21518;&#65292;&#25554;&#20837;&#26469;&#33258;&#39318;&#20803;&#32032;&#20026; <code>s</code> &#25152;&#25351;&#21521;&#30340;&#23383;&#31526;&#25968;&#32452;&#30340;&#30456;&#32487;&#23383;&#31526;&#12290;
<ul>
<li>&#23545;&#20110;&#31532;&#19968;&#21644;&#31532;&#19977;&#37325;&#36733;&#65288;&#20854;&#20013; <code>CharT</code> &#21305;&#37197; <code>ch</code> &#30340;&#31867;&#22411;&#65289;&#65292;&#20934;&#30830;&#25554;&#20837; <code>traits::length(s)</code> &#20010;&#23383;&#31526;&#12290;</li>
<li>&#23545;&#20110;&#31532;&#20108;&#37325;&#36733;&#65292;&#20934;&#30830;&#25554;&#20837; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-char_traits.html"><span class="kw1267">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span>s<span class="br0">)</span></span></span> &#20010;&#23383;&#31526;&#12290;</li>
<li>&#23545;&#20110;&#26368;&#21518;&#20108;&#20010;&#37325;&#36733;&#65292;&#20934;&#30830;&#25554;&#20837; <span class="t-c"><span class="mw-geshi cpp source-cpp">traits<span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span><span class="kw1">reinterpret_cast</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span>s<span class="br0">)</span><span class="br0">)</span></span></span> &#20010;&#23383;&#31526;&#12290;</li>
</ul>
<p>&#22312;&#25554;&#20837;&#21069;&#65292;&#39318;&#20808;&#65292;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">os.<span class="me1">widen</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21152;&#23485;&#25152;&#26377;&#23383;&#31526;&#65292;&#28982;&#21518;&#25353;&#19979;&#21015;&#26041;&#24335;&#30830;&#23450;&#22635;&#20805;&#65306;&#33509;&#35201;&#25554;&#20837;&#30340;&#23383;&#31526;&#25968;&#23569;&#20110; <code>os.width()</code> &#65292;&#21017;&#28155;&#21152;&#36275;&#22815;&#25968;&#37327;&#30340; <code>os.fill()</code> &#21103;&#26412;&#21040;&#23383;&#31526;&#24207;&#21015;&#65292;&#20197;&#20196;&#20854;&#38271;&#31561;&#20110; <code>os.width()</code> &#12290;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>out.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span><span class="sy3">&amp;</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1686">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">adjustfield</span></span></a><span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1683">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">left</span></span></a></span></span> &#65292;&#21017;&#28155;&#21152;&#22635;&#20805;&#23383;&#31526;&#21040;&#36755;&#20986;&#24207;&#21015;&#30340;&#26411;&#23614;&#65292;&#21542;&#21017;&#28155;&#21152;&#23427;&#20204;&#21040;&#24207;&#21015;&#20043;&#21069;&#12290; &#22312;&#25554;&#20837;&#21518;&#65292;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">width<span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span></span></span> &#21462;&#28040; <span class="t-lc"><a href="cpp-io-manip-setw.html">std::setw</a></span> &#30340;&#25928;&#26524;&#65292;&#33509;&#23427;&#23384;&#22312;&#12290;</p>
&#33509; <code>s</code> &#20026;&#31354;&#25351;&#38024;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#32473;&#23450;&#21040;&#36755;&#20986;&#27969;&#23545;&#35937;&#30340;&#21491;&#20540;&#24341;&#29992;&#65292;&#35843;&#29992;&#36866;&#24403;&#30340;&#25554;&#20837;&#36816;&#31639;&#31526;&#65288;&#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1">&lt;&lt;</span> value</span></span> &#65289;&#12290;&#27492;&#37325;&#36733;&#20165;&#33509;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1">&lt;&lt;</span> value</span></span> &#20026;&#33391;&#26500;&#19988; <code>Ostream</code> &#26159;&#20844;&#24320;&#19988;&#26080;&#27495;&#20041;&#22320;&#27966;&#29983;&#33258; <span class="t-lc"><a href="cpp-io-ios_base.html">std::ios_base</a></span> &#30340;&#31867;&#31867;&#22411;&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#25509;&#21463; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char16_t</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char32_t</span></span></span> &#30340;&#65288;&#25110;&#20854;&#31354;&#32456;&#27490;&#24207;&#21015;&#30340;&#65289;&#37325;&#36733;&#34987;&#21024;&#38500;&#65306;&#19981;&#20801;&#35768; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> u<span class="st0">&#39;X&#39;</span></span></span> &#12290;&#20043;&#21069;&#65292;&#36825;&#20123;&#20250;&#25171;&#21360;&#25972;&#25968;&#25110;&#25351;&#38024;&#20540;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>os</td>
<td>-</td>
<td>&#35201;&#25554;&#20837;&#25968;&#25454;&#30340;&#36755;&#20986;&#27969;</td>
</tr>
<tr class="t-par">
<td>ch</td>
<td>-</td>
<td>&#35201;&#25554;&#20837;&#30340;&#23383;&#31526;</td>
</tr>
<tr class="t-par">
<td>s</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#25554;&#20837;&#30340;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1-2)</span> <code>os</code></div>
<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>os<span class="br0">)</span></span></span></div>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#22312; <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue1203">LWG#1203</a> &#21069;&#65292;&#22914; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><a href="cpp-io-basic_ostringstream.html"><span class="kw1736">std::<span class="me2">ostringstream</span></span></a><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="nu16">1.2</span><span class="br0">)</span>.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span></span></span> &#30340;&#20195;&#30721;&#26080;&#27861;&#32534;&#35793;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;fstream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Hello, world&quot;</span> <span class="co1">// const char* &#37325;&#36733;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span> <span class="co1">// char &#37325;&#36733;</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span><span class="st0">&quot;test.txt&quot;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="nu16">1.2</span><span class="sy4">;</span> <span class="co1">// &#21491;&#20540;&#37325;&#36733;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">Hello, world</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue1203">LWG 1203</a></td>
<td>C++11</td>
<td>&#21491;&#20540;&#27969;&#30340;&#37325;&#36733;&#36820;&#22238;&#21040;&#22522;&#31867;&#30340;&#24038;&#20540;&#24341;&#29992;</td>
<td>&#36820;&#22238;&#21040;&#27966;&#29983;&#31867;&#30340;&#21491;&#20540;&#24341;&#29992;</td>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2534">LWG 2534</a></td>
<td>C++11</td>
<td>&#21491;&#20540;&#27969;&#30340;&#37325;&#36733;&#26410;&#34987;&#21046;&#32422;</td>
<td>&#24050;&#21046;&#32422;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_ostream-operator_ltlt.html"><span class="t-lines"><span>operator&lt;&lt;</span></span></a></div>
</div>
</td>
<td>&#25554;&#20837;&#24102;&#26684;&#24335;&#25968;&#25454;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_ios-widen.html"><span class="t-lines"><span>widen</span></span></a></div>
</div>
</td>
<td>&#25299;&#23485;&#23383;&#31526;<br />
<span class="t-mark">(<code>std::basic_ios&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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