116 lines
8.2 KiB
HTML
116 lines
8.2 KiB
HTML
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<title>std::atomic_ref<T>::operator++,++(int),--,--(int)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::atomic_ref<T>::</span>operator++,++<span style="font-size:0.7em; line-height:130%">(int)</span>,--,--<span style="font-size:0.7em; line-height:130%">(int)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-atomic.html">atomic</a>‎ | <a href="cpp-atomic-atomic_ref.html">atomic ref</a></span></div>
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<div>仅为 <code>atomic_ref<<i>Integral</i>></code> 与 <code>atomic_ref<T*></code> 模板特化的成员</div>
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<div><span class="mw-geshi cpp source-cpp">value_type operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</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-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">value_type operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</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-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">value_type operator<span class="sy2">--</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</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-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">value_type operator<span class="sy2">--</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> <span class="kw4">const</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-cxx20">(C++20 起)</span></td>
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<p>原子地自增或自减被引用对象的当前值。这些操作是读修改写操作。</p>
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<div class="t-li1"><span class="t-li">1)</span> 进行前自增。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> fetch_add<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">1</span><span class="sy4">;</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 进行后自增。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> fetch_add<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 进行前自减。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> fetch_sub<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy2">-</span> <span class="nu0">1</span><span class="sy4">;</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">4)</span> 进行后自减。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> fetch_sub<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</div>
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<p>对于有符号整数 (<code>Integral</code>) 类型，定义算术为使用补码。无未定义结果。</p>
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<p>对于 <code>T*</code> 类型，结果可为未定义地址，但操作不会另有未定义行为。若 <code>T</code> 不是对象类型则行为未定义。</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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<p>（无）</p>
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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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<div class="t-li1"><span class="t-li">1,3)</span> 被引用对象在修改后的值。</div>
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<div class="t-li1"><span class="t-li">2,4)</span> 被引用对象在修改前的值。</div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>不同于大多数前自增和前自减运算符， <code>atomic_ref</code> 的前自增和前自减运算符不返回到被修改对象的引用。它们替而返回存储的值的副本。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-atomic-atomic_ref-fetch_add.html"><span class="t-lines"><span>fetch_add</span></span></a></div>
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<td>原子地将参数加到存储于被引用对象的值，并获得先前保有的值<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-atomic-atomic_ref-fetch_sub.html"><span class="t-lines"><span>fetch_sub</span></span></a></div>
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<td>原子地从存储于被引用对象的值减去参数，并获得先前保有的值<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-atomic-atomic_ref-operator_arith2.html"><span class="t-lines"><span>operator+=</span><span>operator-=</span><span>operator&=</span><span>operator|=</span><span>operator^=</span></span></a></div>
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<td>原子地和被引用值加、减或者进行逐位与、或、异或<br />
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<span class="t-mark">(公开成员函数)</span></td>
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