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<title>std::unique_ptr<T,Deleter>::operator<<</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::unique_ptr<T,Deleter>::</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-memory.html">memory</a>‎ | <a href="cpp-memory-unique_ptr.html">unique ptr</a></span></div>
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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> CharT, <span class="kw1">class</span> Traits, <span class="kw1">class</span> Y, <span class="kw1">class</span> D<span class="sy1">></span><br /></span>
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<p><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy3">&</span> os,<br /></p>
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<span class="kw4">const</span> <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1"><</span>Y, D<span class="sy1">></span><span class="sy3">&</span> p<span class="br0">)</span><span class="sy4">;</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>插入 <code>p</code> 所管理的指针的值到输出流 <code>os</code> 中。</p>
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<p>等价于 <code>os << p.get()</code> 。</p>
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<p>此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1"><<</span> p.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span> 为合法表达式才参与重载决议。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>os</td>
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<td>-</td>
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<td>要插入 <code>p</code> 到的 <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::basic_ostream</a></span></td>
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<tr class="t-par">
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<td>p</td>
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<td>-</td>
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<td>要插入到 <code>os</code> 的指针</td>
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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><code>os</code></p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1"><</span>Y, D<span class="sy1">></span><span class="sy4">::</span><span class="me2">pointer</span></span></span> 为指向字符类型的指针（例如当 <code>Y</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="br0">[</span><span class="br0">]</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">CharT</span></span> 时），这可能最终调用 <a href="cpp-io-basic_ostream-operator_ltlt2.html"><code>operator<<</code> 对空终止字符串的重载</a>（若该指针实际上不指向这种字符串，则导致未定义行为），而非<a href="cpp-io-basic_ostream-operator_ltlt.html">打印指针值自身的重载</a>。</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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<div class="t-example">
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<div class="t-example-live-link"></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"><span class="co2">#include <iostream></span>
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<span class="co2">#include <memory></span>
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<span class="kw1">class</span> Foo <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">auto</span> p <span class="sy1">=</span> <a href="cpp-memory-unique_ptr-make_unique.html"><span class="kw735">std::<span class="me2">make_unique</span></span></a><span class="sy1"><</span>Foo<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> p <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> p.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">0x6d9028
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0x6d9028</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-unique_ptr-get.html"><span class="t-lines"><span>get</span></span></a></div>
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</td>
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<td>返回指向被管理对象的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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