99 lines
9.0 KiB
HTML
99 lines
9.0 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::experimental::ranges::invoke</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_ranges_functional_invoke skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>invoke</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-ranges.html">ranges</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-experimental-ranges-functional.html"><experimental/ranges/functional></a></code></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> F, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">></span><br />
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<a href="cpp-types-result_of.html"><span class="kw640">std::<span class="me2">result_of_t</span></span></a><span class="sy1"><</span>F<span class="sy3">&&</span><span class="br0">(</span>Args<span class="sy3">&&</span>...<span class="br0">)</span><span class="sy1">></span> invoke<span class="br0">(</span>F<span class="sy3">&&</span> f, Args<span class="sy3">&&</span>... <span class="me1">args</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
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<p>以参数 <code>args</code> 调用<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 <code>f</code> ，并返回结果，如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> INVOKE<span class="br0">(</span><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>, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Args<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span><span class="sy4">;</span></span></span> ，其中 <i>INVOKE(f, t1, t2, ..., tN)</i> 定义如下：</p>
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<ul>
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<li>若 <code>f</code> 为类 <code>T</code> 的<a href="cpp-language-pointer.html#.E6.8C.87.E5.90.91.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0.E6.8C.87.E9.92.88">指向成员函数指针</a>：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_base_of.html"><span class="kw590">std::<span class="me2">is_base_of</span></span></a><span class="sy1"><</span>T, <a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span>t1<span class="br0">)</span><span class="sy1">>></span><span class="sy4">::</span><span class="me2">value</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则 <span class="t-c"><span class="mw-geshi cpp source-cpp">INVOKE<span class="br0">(</span>f, t1, t2, ..., tN<span class="br0">)</span></span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>t1.<span class="sy2">*</span>f<span class="br0">)</span><span class="br0">(</span>t2, ..., tN<span class="br0">)</span></span></span></li>
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<li>否则， <span class="t-c"><span class="mw-geshi cpp source-cpp">INVOKE<span class="br0">(</span>f, t1, t2, ..., tN<span class="br0">)</span></span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="br0">(</span><span class="sy2">*</span>t1<span class="br0">)</span>.<span class="sy2">*</span>f<span class="br0">)</span><span class="br0">(</span>t2, ..., tN<span class="br0">)</span></span></span> 。</li>
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</dd>
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</dl>
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<ul>
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<li>否则，若 N == 1 且 <code>f</code> 为类 <code>T</code> 的<a href="cpp-language-pointer.html#.E6.8C.87.E5.90.91.E6.95.B0.E6.8D.AE.E6.88.90.E5.91.98.E6.8C.87.E9.92.88">指向数据成员指针</a>：</li>
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<ul>
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_base_of.html"><span class="kw590">std::<span class="me2">is_base_of</span></span></a><span class="sy1"><</span>T, <a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span>t1<span class="br0">)</span><span class="sy1">>></span><span class="sy4">::</span><span class="me2">value</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则 <span class="t-c"><span class="mw-geshi cpp source-cpp">INVOKE<span class="br0">(</span>f, t1<span class="br0">)</span></span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">t1.<span class="sy2">*</span>f</span></span> 。</li>
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<li>否则， <span class="t-c"><span class="mw-geshi cpp source-cpp">INVOKE<span class="br0">(</span>f, t1<span class="br0">)</span></span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="sy2">*</span>t1<span class="br0">)</span>.<span class="sy2">*</span>f</span></span> 。</li>
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</ul>
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</dd>
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</dl>
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<ul>
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<li>否则 <span class="t-c"><span class="mw-geshi cpp source-cpp">INVOKE<span class="br0">(</span>f, t1, t2, ..., tN<span class="br0">)</span></span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">f<span class="br0">(</span>t1, t2, ..., tN<span class="br0">)</span></span></span> （即 <code>f</code> 是<a href="cpp-named_req-FunctionObject.html"><span style="font-style:italic">函数对象</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(FunctionObject)</span></a> ）。</li>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>f</td>
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<td>-</td>
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<td>要调用的<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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<td>args</td>
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<td>-</td>
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<td>传递给 <code>f</code> 的参数</td>
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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 class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-invoke.html"><span class="t-lines"><span>invoke</span><span>invoke_r</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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<td>以给定实参<span class="t-rev-inl t-since-cxx23"><span>和可能指定的返回类型</span> <span><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></span></span>调用任意<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<br />
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<span class="t-mark">(函数模板)</span></td>
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<div class="visualClear"></div>
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