216 lines
24 KiB
HTML
216 lines
24 KiB
HTML
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<title>std::move_only_function<R(Args...) cv ref noexcept(noex)>::move_only_function</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::move_only_function<R(Args...) <i>cv</i> <i>ref</i> noexcept(<i>noex</i>)>::</span>move_only_function</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-utility.html">utility</a>‎ | <a href="cpp-utility-functional.html">functional</a>‎ | <a href="cpp-utility-functional-move_only_function.html">move only function</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">move_only_function<span class="br0">(</span><span class="br0">)</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-cxx23">(C++23 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">move_only_function<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="br0">)</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-cxx23">(C++23 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx23">
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<div><span class="mw-geshi cpp source-cpp">move_only_function<span class="br0">(</span> move_only_function<span class="sy3">&&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<tr class="t-dcl t-since-cxx23">
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<div><span class="mw-geshi cpp source-cpp">move_only_function<span class="br0">(</span> <span class="kw4">const</span> move_only_function<span class="sy3">&</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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</td>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<tr class="t-dcl t-since-cxx23">
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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> F <span class="sy1">></span><br />
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move_only_function<span class="br0">(</span> F<span class="sy3">&&</span> f <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx23">
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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> T, <span class="kw1">class</span>... <span class="me1">CArgs</span> <span class="sy1">></span><br />
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<span class="kw1">explicit</span> move_only_function<span class="br0">(</span> <a href="cpp-utility-in_place.html"><span class="kw1083">std::<span class="me2">in_place_type_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, CArgs<span class="sy3">&&</span>... <span class="me1">args</span> <span class="br0">)</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-cxx23">(C++23 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx23">
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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> T, <span class="kw1">class</span> U, <span class="kw1">class</span>... <span class="me1">CArgs</span> <span class="sy1">></span><br /></span>
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<p><span class="kw1">explicit</span> move_only_function<span class="br0">(</span> <a href="cpp-utility-in_place.html"><span class="kw1083">std::<span class="me2">in_place_type_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>,<br /></p>
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<a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>U<span class="sy1">></span> il, CArgs<span class="sy3">&&</span>... <span class="me1">args</span> <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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<td>(7)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>创建新的 <code>std::move_only_function</code> 。</p>
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<div class="t-li1"><span class="t-li">1-2)</span> 默认构造函数与接收 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> 的构造函数构造空的 <code>std::move_only_function</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 移动构造函数构造目标为 <code>other</code> 的目标的 <code>std::move_only_function</code> 。移动构造后 <code>other</code> 在拥有未指定值的合法状态。</div>
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<div class="t-li1"><span class="t-li">4)</span> 复制构造函数被删除。 <code>std::move_only_function</code> 不满足<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">可复制构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span></a> 。</div>
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<div class="t-li1"><span class="t-li">5)</span> 令 <code>VT</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1"><</span>F<span class="sy1">></span></span></span> 。若 <code>f</code> 为空函数指针、空成员函数指针或空 <code>std::move_only_function</code> （可为任何特化），则构造空的 <code>std::move_only_function</code> 。否则，构造目标具有 <code>VT</code> 类型并以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>F<span class="sy1">></span><span class="br0">(</span>f<span class="br0">)</span></span></span> 直接非列表初始化的 <code>std::move_only_function</code> 。
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<ul>
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<li>此重载仅若 <code>VT</code> 既非 <code>move_only_function</code> 亦非 <span class="t-lc"><a href="cpp-utility-in_place.html">std::in_place_type_t</a></span> 的特化，且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*is-callable-from*/</span><span class="sy1"><</span>VT<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才参与重载决议。</li>
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>VT, F<span class="sy1">></span></span></span> 非 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则程序非良构。</li>
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</ul>
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</div>
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<div class="t-li1"><span class="t-li">6)</span> 令 <code>VT</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 。构造目标具有 <code>VT</code> 类型并以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>CArgs<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>...</span></span> 直接非列表初始化的 <code>std::move_only_function</code> 。
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<ul>
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<li>此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>VT, CArgs...<span class="sy1">></span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*is-callable-from*/</span><span class="sy1"><</span>VT<span class="sy1">></span></span></span> （见后述）均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才参与重载决议。</li>
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<li>若 <code>VT</code> 与 <code>T</code> 不是同一类型则程序非良构。</li>
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</ul>
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</div>
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<div class="t-li1"><span class="t-li">7)</span> 令 <code>VT</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 。构造目标具有 <code>VT</code> 类型并以 <span class="t-c"><span class="mw-geshi cpp source-cpp">il, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>CArgs<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>...</span></span> 直接非列表初始化的 <code>std::move_only_function</code> 。
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<ul>
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<li>此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>VT, <a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span>, CArgs...<span class="sy1">></span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*is-callable-from*/</span><span class="sy1"><</span>VT<span class="sy1">></span></span></span> （见后述）均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才参与重载决议。</li>
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<li>若 <code>VT</code> 与 <code>T</code> 不是同一类型则程序非良构。</li>
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</ul>
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</div>
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<p>对于构造函数 <span class="t-v">(5-7)</span> ，若 <code>VT</code> 不满足<a href="cpp-named_req-Destructible.html"><span style="font-style:italic">可析构</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Destructible)</span></a> 要求或若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_constructible.html"><span class="kw539">std::<span class="me2">is_move_constructible_v</span></span></a><span class="sy1"><</span>VT<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 但不满足<a href="cpp-named_req-MoveConstructible.html"><span style="font-style:italic">可移动构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveConstructible)</span></a> 要求则行为未定义。</p>
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<p>常量 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*is-callable-from*/</span><span class="sy1"><</span>VT<span class="sy1">></span></span></span> 以如下方式取决于 <code>std::move_only_function</code> 的模板形参中的 <span class="t-spar">cv</span>、 <span class="t-spar">ref</span> 及 <span class="t-spar">noex</span> ：</p>
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<table class="mw-collapsible mw-collapsed wikitable">
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<th><span class="t-spar">cv</span> <span class="t-spar">ref</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span></span></span><span class="t-spar">noex</span><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">)</span></span></span></th>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*is-callable-from*/</span><span class="sy1"><</span>VT<span class="sy1">></span></span></span></th>
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</tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, VT, Args...<span class="sy1">></span> <span class="sy3">&&</span><br /></span></span>
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<p>std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, VT<span class="sy3">&</span>, Args...<span class="sy1">></span></p>
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</td>
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</tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, VT, Args...<span class="sy1">></span> <span class="sy3">&&</span><br /></span></span>
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<p>std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, VT<span class="sy3">&</span>, Args...<span class="sy1">></span></p>
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</td>
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</tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT, Args...<span class="sy1">></span> <span class="sy3">&&</span><br /></span></span>
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<p>std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT<span class="sy3">&</span>, Args...<span class="sy1">></span></p>
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</td>
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</tr>
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<tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT, Args...<span class="sy1">></span> <span class="sy3">&&</span><br /></span></span>
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<p>std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT<span class="sy3">&</span>, Args...<span class="sy1">></span></p>
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</td>
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</tr>
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<tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, VT<span class="sy3">&</span>, Args...<span class="sy1">></span></span></span></td>
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</tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, VT<span class="sy3">&</span>, Args...<span class="sy1">></span></span></span></td>
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</tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="sy3">&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT<span class="sy3">&</span>, Args...<span class="sy1">></span></span></span></td>
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<tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="sy3">&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT<span class="sy3">&</span>, Args...<span class="sy1">></span></span></span></td>
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</tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, VT, Args...<span class="sy1">></span></span></span></td>
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</tr>
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<tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, VT, Args...<span class="sy1">></span></span></span></td>
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</tr>
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<tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="sy3">&&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT, Args...<span class="sy1">></span></span></span></td>
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</tr>
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<tr>
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<th><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="sy3">&&</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span></span></span></th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">is_nothrow_invocable_r_v</span><span class="sy1"><</span>R, <span class="kw4">const</span> VT, Args...<span class="sy1">></span></span></span></td>
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</tr>
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</table>
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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>other</td>
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<td>-</td>
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<td>要移动的另一 <code>std::move_only_function</code></td>
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</tr>
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<tr class="t-par">
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<td>f</td>
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<td>-</td>
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<td>要包装的函数或<a href="cpp-named_req-Callable.html"><span style="font-style:italic">可调用</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Callable)</span></a> 对象</td>
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</tr>
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<tr class="t-par">
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<td>args</td>
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<td>-</td>
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<td>构造目标对象的参数</td>
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</tr>
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<tr class="t-par">
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<td>il</td>
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<td>-</td>
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<td>构造目标对象的 <span class="t-lc"><a href="cpp-utility-initializer_list.html">std::initializer_list</a></span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-li1"><span class="t-li">5-7)</span> 可能在分配失败时抛出 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> 或传播初始化目标时抛出的异常。若 <code>VT</code> 为函数指针类型或 <span class="t-lc"><a href="cpp-utility-functional-reference_wrapper.html">std::reference_wrapper</a></span> 的特化则不抛异常。</div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<tr>
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-utility-functional-function-function.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造新的 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 实例<br />
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<span class="t-mark">(<code>std::function<R(Args...)></code> 的公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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