218 lines
11 KiB
HTML
218 lines
11 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::function</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_function skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::</span>function</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/functional&action=edit&redlink=1" class="new" title="cpp/header/experimental/functional（页面不存在）"><experimental/functional></a></code></div>
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<tr class="t-dcl t-since-libfund_ts">
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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> <span class="sy1">></span><br />
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<span class="kw1">class</span> function<span class="sy4">;</span> <span class="coMULTI">/* undefined */</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 TS)</span></td>
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</tr>
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<tr class="t-dcl t-since-libfund_ts">
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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> R, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">></span><br />
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<span class="kw1">class</span> function<span class="sy1"><</span>R<span class="br0">(</span>Args...<span class="br0">)</span><span class="sy1">></span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 TS)</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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</tbody>
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<p><code>std::experimental::function</code> 是 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 的修改版本，支持类型擦除分配器。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>类型</td>
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<td>定义</td>
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</tr>
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<tr class="t-dsc">
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<td><code>allocator_type</code></td>
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<td><span class="t-lc"><a href="cpp-experimental-erased_type.html">std::experimental::erased_type</a></span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-experimental-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 <code>std::experimental::function</code> 实例<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-function-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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</div>
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</td>
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<td>赋值新目标<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-function-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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</div>
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</td>
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<td>交换内容<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-function-get_memory_resource.html"><span class="t-lines"><span>get_memory_resource</span></span></a></div>
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</div>
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</td>
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<td>获得指向此对象用来分配内存的 memory_resource 的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</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">
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<div><a href="cpp-experimental-function-swap2.html"><span class="t-lines"><span>std::experimental::swap<span class="t-dsc-small">(std::experimental::function)</span></span></span></a></div>
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</div>
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</td>
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<td>特化 <code>swap</code> 算法<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-function-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div>
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</div>
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</td>
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<td>比较 <span class="t-lc">std::experimental::function</span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span><br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</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">
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<div><a href="cpp-experimental-function-uses_allocator.html"><span class="t-lines"><span>std::uses_allocator<span class="t-dsc-small"><std::experimental::function></span></span></span></a></div>
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</div>
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</td>
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<td>特化 <span class="t-lc"><a href="cpp-memory-uses_allocator.html">std::uses_allocator</a></span> 类型特性<br />
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<span class="t-mark">(类模板特化)</span></td>
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</tr>
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</table>
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<div style="overflow: hidden; margin: 1em 0 0 0; border: 1px solid #aaa; background-color: #e3f9df; padding: 0.2em 1em 1em 1em;" id="identical-">
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<h2><span class="mw-headline" id=".E7.AD.89.E5.90.8C.E4.BA.8E_std::function_.E7.9A.84.E6.88.90.E5.91.98">等同于 <span style="font-size:0.7em; line-height:130%">std::</span>function 的成员</span></h2>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B_2">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>类型</td>
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<td>定义</td>
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</tr>
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<tr class="t-dsc">
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<td><code>result_type</code></td>
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<td><code>R</code></td>
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</tr>
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<tr class="t-dsc">
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<td><code>argument_type</code></td>
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<td>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Args<span class="br0">)</span><span class="sy1">==</span><span class="nu0">1</span></span></span> ，且 <code>T</code> 为 <code>Args...</code> 中第一个并为唯一的类型则为 <code>T</code></td>
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</tr>
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<tr class="t-dsc">
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<td><code>first_argument_type</code></td>
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<td>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Args<span class="br0">)</span><span class="sy1">==</span><span class="nu0">2</span></span></span> 且 <code>T1</code> 为 <code>Args...</code> 中二个类型的第一个则为 <code>T1</code></td>
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</tr>
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<tr class="t-dsc">
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<td><code>second_argument_type</code></td>
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<td>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Args<span class="br0">)</span><span class="sy1">==</span><span class="nu0">2</span></span></span> 且 <code>T2</code> 为 <code>Args...</code> 中二个类型的第二个则为 <code>T2</code></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_2">成员函数</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>(析构函数)</span></span></a></div>
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</div>
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</td>
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<td>析构 <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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-function-operator_bool.html"><span class="t-lines"><span>operator bool</span></span></a></div>
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</div>
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</td>
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<td>检查是否包含了有效的目标<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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-function-operator().html"><span class="t-lines"><span>operator()</span></span></a></div>
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</div>
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</td>
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<td>调用其目标<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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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E7.9B.AE.E6.A0.87.E8.AE.BF.E9.97.AE">目标访问</span></h5>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-function-target_type.html"><span class="t-lines"><span>target_type</span></span></a></div>
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</div>
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</td>
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<td>获得 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 所存储的目标的<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">typeid</span></span></span><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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-function-target.html"><span class="t-lines"><span>target</span></span></a></div>
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</div>
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</td>
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<td>获得指向 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 所存储的目标的指针<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>
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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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