133 lines
12 KiB
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133 lines
12 KiB
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<title>operator==,!=,<,<=,>,>=(std::experimental::observer_ptr)</title>
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<h1 id="firstHeading" class="firstHeading">operator==,!=,<,<=,>,>=<small>(std::experimental::observer_ptr)</small></h1>
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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-observer_ptr.html">observer 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> W1, <span class="kw1">class</span> W2<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W1<span class="sy1">></span><span class="sy3">&</span> p1, <span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span><span class="sy3">&</span> p2<span class="br0">)</span><span class="sy4">;</span></span></div>
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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"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> W1, <span class="kw1">class</span> W2<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W1<span class="sy1">></span><span class="sy3">&</span> p1, <span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span><span class="sy3">&</span> p2<span class="br0">)</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></td>
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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> W<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W<span class="sy1">></span><span class="sy3">&</span> p, <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>
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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></td>
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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> W<span class="sy1">></span><br />
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<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> observer_ptr<span class="sy1"><</span>W<span class="sy1">></span><span class="sy3">&</span> p<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(4)</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"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> W<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W<span class="sy1">></span><span class="sy3">&</span> p, <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>
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<td>(5)</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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</tr>
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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> W<span class="sy1">></span><br />
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<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> observer_ptr<span class="sy1"><</span>W<span class="sy1">></span><span class="sy3">&</span> p<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(6)</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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</tr>
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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> W1, <span class="kw1">class</span> W2<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy1"><</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W1<span class="sy1">></span><span class="sy3">&</span> p1, <span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span><span class="sy3">&</span> p2<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(7)</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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</tr>
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<tr class="t-dcl t-since-libfund_ts_2">
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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> W1, <span class="kw1">class</span> W2<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy1">></span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W1<span class="sy1">></span><span class="sy3">&</span> p1, <span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span><span class="sy3">&</span> p2<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(8)</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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</tr>
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<tr class="t-dcl t-since-libfund_ts_2">
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<td>
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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> W1, <span class="kw1">class</span> W2<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy1"><=</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W1<span class="sy1">></span><span class="sy3">&</span> p1, <span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span><span class="sy3">&</span> p2<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(9)</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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</tr>
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<tr class="t-dcl t-since-libfund_ts_2">
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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> W1, <span class="kw1">class</span> W2<span class="sy1">></span><br />
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<span class="kw4">bool</span> operator<span class="sy1">>=</span><span class="br0">(</span><span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W1<span class="sy1">></span><span class="sy3">&</span> p1, <span class="kw4">const</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span><span class="sy3">&</span> p2<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(10)</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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</tr>
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<td></td>
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<td></td>
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<td></td>
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<p>比较二个 <code>observer_ptr</code> 的指针值，或一个 <code>observer_ptr</code> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> 。</p>
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<div class="t-li1"><span class="t-li">1-2)</span> 二个 <code>observer_ptr</code> 的相等比较</div>
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<div class="t-li1"><span class="t-li">3-6)</span> 一个 <code>observer_ptr</code> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> 的相等比较。</div>
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<div class="t-li1"><span class="t-li">7-10)</span> 二个 <code>observer_ptr</code> 的顺序比较。</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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<table class="t-par-begin">
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<td>p, p1, p2</td>
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<td>-</td>
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<td>要比较的 <code>observer_ptr</code></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>1) <span class="t-c"><span class="mw-geshi cpp source-cpp">p1.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> p2.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></p>
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<p>2) <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>p1 <span class="sy1">==</span> p2<span class="br0">)</span></span></span></p>
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<p>3-4) <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>p</span></span></p>
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<p>5-6) <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span>p</span></span></p>
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<p>7) <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"><</span>W3<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p1.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span>, p2.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ，其中 <code>W3</code> 是 <code>W1*</code> 与 <code>W2*</code> 的合成指针类型</p>
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<p>8) <span class="t-c"><span class="mw-geshi cpp source-cpp">p2 <span class="sy1"><</span> p1</span></span></p>
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<p>9) <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>p2 <span class="sy1"><</span> p1<span class="br0">)</span></span></span></p>
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<p>10) <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span><span class="br0">(</span>p1 <span class="sy1"><</span> p2<span class="br0">)</span></span></span></p>
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