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<title>operator==,!=,&lt;,&lt;=,&gt;,&gt;=,&lt;=&gt;(std::unique_ptr)</title>
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<h1 id="firstHeading" class="firstHeading">operator==,!=,&lt;,&lt;=,&gt;,&gt;=,&lt;=&gt;<small>(std::unique_ptr)</small></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-memory.html">memory</a>&lrm; | <a href="cpp-memory-unique_ptr.html">unique ptr</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-memory.html">&lt;memory&gt;</a></code></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> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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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> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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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> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#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> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(5)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#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> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(6)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></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">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T1, <span class="kw1">class</span> D1, <span class="kw1">class</span> T2, <span class="kw1">class</span> D2<span class="sy1">&gt;</span><br /></span>
<p>&nbsp; &nbsp; requires std<span class="sy4">::</span><span class="me2">three_way_comparable_with</span><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><br />
std<span class="sy4">::</span><span class="me2">compare_three_way_result_t</span><span class="sy1">&lt;</span><span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><br /></p>
&nbsp; &nbsp; operator<span class="sy1">&lt;=&gt;</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(7)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
</td>
<td>(8)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a>, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
</td>
<td>(9)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
</td>
<td>(10)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a>, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
</td>
<td>(11)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(12)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span><a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a>, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(13)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(14)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span><a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a>, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(15)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(16)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;</span><span class="br0">(</span><a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a>, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(17)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(18)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span><a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a>, <span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(19)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> D<span class="sy1">&gt;</span><br /></span>
<p>&nbsp; &nbsp; requires std<span class="sy4">::</span><span class="me2">three_way_comparable</span><span class="sy1">&lt;</span><span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><br />
std<span class="sy4">::</span><span class="me2">compare_three_way_result_t</span><span class="sy1">&lt;</span><span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><br /></p>
&nbsp; &nbsp; operator<span class="sy1">&lt;=&gt;</span><span class="br0">(</span><span class="kw4">const</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x, <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a><span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(20)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
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<p>&#27604;&#36739;&#20108;&#20010; <code>unique_ptr</code> &#25110; <code>unique_ptr</code> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> &#30340;&#25351;&#38024;&#20540;&#12290;</p>
<div class="t-li1"><span class="t-li">1-7)</span> &#27604;&#36739;&#20108;&#20010; <code>unique_ptr</code> &#12290;</div>
<div class="t-li1"><span class="t-li">8-20)</span> &#27604;&#36739; <code>unique_ptr</code> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> &#12290;</div>
<table class="t-rev-begin">
<tr class="t-rev t-since-cxx20">
<td>
<p><code>!=</code> &#36816;&#31639;&#31526;&#20174; <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">&#21512;&#25104;</a>&#12290;</p>
</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
</table>
<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>x, y</td>
<td>-</td>
<td>&#35201;&#27604;&#36739;&#30340; <code>unique_ptr</code></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)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> y.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> y.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1">&lt;</span>CT<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>x.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span>, y.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#20854;&#20013; <code>CT</code> &#26159; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1">&lt;</span>unique_ptr<span class="sy1">&lt;</span>T1, D1<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span>, unique_ptr<span class="sy1">&lt;</span>T2, D2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span></span></span></div>
<div class="t-li1"><span class="t-li">4)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>y <span class="sy1">&lt;</span> x<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">5)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">y <span class="sy1">&lt;</span> x</span></span></div>
<div class="t-li1"><span class="t-li">6)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>x <span class="sy1">&lt;</span> y<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">7)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">compare_three_way</span><span class="br0">{</span><span class="br0">}</span><span class="br0">(</span>x.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span>, y.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">8-9)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>x</span></span></div>
<div class="t-li1"><span class="t-li">10-11)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span>x</span></span></div>
<div class="t-li1"><span class="t-li">12)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1">&lt;</span>unique_ptr<span class="sy1">&lt;</span>T,D<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>x.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span>, nullptr<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">13)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1">&lt;</span>unique_ptr<span class="sy1">&lt;</span>T,D<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>nullptr, y.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">14)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>nullptr <span class="sy1">&lt;</span> x<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">15)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>y <span class="sy1">&lt;</span> nullptr<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">16)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr <span class="sy1">&lt;</span> x</span></span></div>
<div class="t-li1"><span class="t-li">17)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">y <span class="sy1">&lt;</span> nullptr</span></span></div>
<div class="t-li1"><span class="t-li">18)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>x <span class="sy1">&lt;</span> nullptr<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">19)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>nullptr <span class="sy1">&lt;</span> y<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">20)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">compare_three_way</span><span class="br0">{</span><span class="br0">}</span><span class="br0">(</span>x.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span>, <span class="kw1">static_cast</span><span class="sy1">&lt;</span><span class="kw1">typename</span> unique_ptr<span class="sy1">&lt;</span>T, D<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span><span class="sy1">&gt;</span><span class="br0">(</span>nullptr<span class="br0">)</span><span class="br0">)</span></span></span></div>
<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;memory&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> p1<span class="br0">(</span>new <span class="kw4">int</span><span class="br0">(</span><span class="nu0">42</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> p2<span class="br0">(</span>new <span class="kw4">int</span><span class="br0">(</span><span class="nu0">42</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</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;p1 == p1: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="br0">(</span>p1 <span class="sy1">==</span> p1<span class="br0">)</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">// p1 &#19982; p2 &#25351;&#21521;&#19981;&#21516;&#20869;&#23384;&#20301;&#32622;&#65292;&#25925; p1 != p2</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;p1 == p2: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="br0">(</span>p1 <span class="sy1">==</span> p2<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</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">p1 == p1: 1
p1 == p2: 0</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/issue3426">LWG 3426</a></td>
<td>C++20</td>
<td><code>operator&lt;=&gt;(unique_ptr, nullptr_t)</code> &#20026;&#35884;&#26500;</td>
<td>&#20462;&#27491;&#32422;&#26463;&#19982;&#23450;&#20041;</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-memory-unique_ptr-get.html"><span class="t-lines"><span>get</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#25351;&#21521;&#34987;&#31649;&#29702;&#23545;&#35937;&#30340;&#25351;&#38024;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
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