397 lines
35 KiB
HTML
397 lines
35 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
|
|
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<title>标准库头文件 <future></title>
|
|
<link rel="stylesheet" href="ext.css" />
|
|
<link rel="stylesheet" href="site_modules.css" />
|
|
</head>
|
|
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_header_future skin-cppreference2 action-view cpp-navbar">
|
|
<div id="cpp-content-base">
|
|
<div id="content"><a id="top"></a>
|
|
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">标准库头文件</span> <future></h1>
|
|
<div id="bodyContent">
|
|
<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-header.html">header</a></span></div>
|
|
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
|
|
<p>此头文件是<a href="cpp-thread.html">线程支持</a>库的一部分。</p>
|
|
<table class="t-dsc-begin">
|
|
<tr>
|
|
<td colspan="2">
|
|
<h3><span class="mw-headline" id=".E7.B1.BB">类</span></h3>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-promise.html"><span class="t-lines"><span>promise</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>存储一个值以进行异步获取<br />
|
|
<span class="t-mark">(类模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-packaged_task.html"><span class="t-lines"><span>packaged_task</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>打包一个函数，存储其返回值以进行异步获取<br />
|
|
<span class="t-mark">(类模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-future.html"><span class="t-lines"><span>future</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>等待被异步设置的值<br />
|
|
<span class="t-mark">(类模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-shared_future.html"><span class="t-lines"><span>shared_future</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>等待被异步设置的值（可能为其他 future 所引用）<br />
|
|
<span class="t-mark">(类模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-launch.html"><span class="t-lines"><span>launch</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>指定 <span class="t-lc"><a href="cpp-thread-async.html">std::async</a></span> 所用的运行策略<br />
|
|
<span class="t-mark">(枚举)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-future_status.html"><span class="t-lines"><span>future_status</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>指定在 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> 和 <span class="t-lc"><a href="cpp-thread-shared_future.html">std::shared_future</a></span> 上的定时等待的结果<br />
|
|
<span class="t-mark">(枚举)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-future_error.html"><span class="t-lines"><span>future_error</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>报告与 future 或 promise 有关的错误<br />
|
|
<span class="t-mark">(类)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-future_errc.html"><span class="t-lines"><span>future_errc</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>鉴别 future 错误码<br />
|
|
<span class="t-mark">(枚举)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-promise-uses_allocator.html"><span class="t-lines"><span>std::uses_allocator<span class="t-dsc-small"><std::promise></span></span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>特化 <span class="t-lc"><a href="cpp-memory-uses_allocator.html">std::uses_allocator</a></span> 类型特征<br />
|
|
<span class="t-mark">(类模板特化)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-packaged_task-uses_allocator.html"><span class="t-lines"><span>std::uses_allocator<span class="t-dsc-small"><std::packaged_task></span></span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>特化 <span class="t-lc"><a href="cpp-memory-uses_allocator.html">std::uses_allocator</a></span> 类型特征<br />
|
|
<span class="t-mark">(类模板特化)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">函数</span></h3>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-async.html"><span class="t-lines"><span>async</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>异步运行一个函数（有可能在新线程中执行），并返回保有其结果的 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span><br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-future_category.html"><span class="t-lines"><span>future_category</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>鉴别 future 错误类别<br />
|
|
<span class="t-mark">(函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-promise-swap2.html"><span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::promise)</span></span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>特化 <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> 算法<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-packaged_task-swap2.html"><span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::packaged_task)</span></span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>特化 <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> 算法<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">概要</span></h3>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw2">enum</span> <span class="kw1">class</span> future_errc <span class="br0">{</span>
|
|
broken_promise <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span>,
|
|
future_already_retrieved <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span>,
|
|
promise_already_satisfied <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span>,
|
|
no_state <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw2">enum</span> <span class="kw1">class</span> launch <span class="sy4">:</span> <span class="coMULTI">/* 未指明 */</span> <span class="br0">{</span>
|
|
async <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span>,
|
|
deferred <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span>,
|
|
<span class="coMULTI">/* 由实现定义 */</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw2">enum</span> <span class="kw1">class</span> future_status <span class="br0">{</span>
|
|
ready,
|
|
timeout,
|
|
deferred
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><></span> <span class="kw1">struct</span> is_error_code_enum<span class="sy1"><</span>future_errc<span class="sy1">></span> <span class="sy4">:</span> <span class="kw1">public</span> true_type <span class="br0">{</span> <span class="br0">}</span><span class="sy4">;</span>
|
|
error_code make_error_code<span class="br0">(</span>future_errc e<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
error_condition make_error_condition<span class="br0">(</span>future_errc e<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">const</span> error_category<span class="sy3">&</span> future_category<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">class</span> future_error<span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span> <span class="kw1">class</span> promise<span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span> <span class="kw1">class</span> promise<span class="sy1"><</span>R<span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><></span> <span class="kw1">class</span> promise<span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
<span class="kw4">void</span> swap<span class="br0">(</span>promise<span class="sy1"><</span>R<span class="sy1">></span><span class="sy3">&</span> x, promise<span class="sy1"><</span>R<span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> Alloc<span class="sy1">></span>
|
|
<span class="kw1">struct</span> uses_allocator<span class="sy1"><</span>promise<span class="sy1"><</span>R<span class="sy1">></span>, Alloc<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span> <span class="kw1">class</span> future<span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span> <span class="kw1">class</span> future<span class="sy1"><</span>R<span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><></span> <span class="kw1">class</span> future<span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span> <span class="kw1">class</span> shared_future<span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span> <span class="kw1">class</span> shared_future<span class="sy1"><</span>R<span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><></span> <span class="kw1">class</span> shared_future<span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span><span class="sy1">></span> <span class="kw1">class</span> packaged_task<span class="sy4">;</span> <span class="co1">// 不定义</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span>... <span class="me1">ArgTypes</span><span class="sy1">></span>
|
|
<span class="kw1">class</span> packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span>... <span class="me1">ArgTypes</span><span class="sy1">></span>
|
|
<span class="kw4">void</span> swap<span class="br0">(</span>packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span><span class="sy3">&</span>, packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span><span class="sy3">&</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<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>
|
|
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> future<span class="sy1"><</span>invoke_result_t<span class="sy1"><</span>decay_t<span class="sy1"><</span>F<span class="sy1">></span>, decay_t<span class="sy1"><</span>Args<span class="sy1">></span>...<span class="sy1">>></span>
|
|
async<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 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>
|
|
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> future<span class="sy1"><</span>invoke_result_t<span class="sy1"><</span>decay_t<span class="sy1"><</span>F<span class="sy1">></span>, decay_t<span class="sy1"><</span>Args<span class="sy1">></span>...<span class="sy1">>></span>
|
|
async<span class="br0">(</span>launch policy, 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 class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB_std::future_error">类 <span class="t-lc"><a href="cpp-thread-future_error.html">std::future_error</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">class</span> future_error <span class="sy4">:</span> <span class="kw1">public</span> logic_error <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">explicit</span> future_error<span class="br0">(</span>future_errc e<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">const</span> error_code<span class="sy3">&</span> code<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> what<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
error_code ec_<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::promise">类模板 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
<span class="kw1">class</span> promise <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
promise<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Allocator<span class="sy1">></span>
|
|
promise<span class="br0">(</span>allocator_arg_t, <span class="kw4">const</span> Allocator<span class="sy3">&</span> a<span class="br0">)</span><span class="sy4">;</span>
|
|
promise<span class="br0">(</span>promise<span class="sy3">&&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
promise<span class="br0">(</span><span class="kw4">const</span> promise<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
~promise<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 赋值</span>
|
|
promise<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>promise<span class="sy3">&&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
promise<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> promise<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
<span class="kw4">void</span> swap<span class="br0">(</span>promise<span class="sy3">&</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 取得结果</span>
|
|
future<span class="sy1"><</span>R<span class="sy1">></span> get_future<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 设置结果</span>
|
|
<span class="kw4">void</span> set_value<span class="br0">(</span><span class="coMULTI">/* 见描述 */</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> set_exception<span class="br0">(</span>exception_ptr p<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 以延迟提醒设置结果</span>
|
|
<span class="kw4">void</span> set_value_at_thread_exit<span class="br0">(</span><span class="coMULTI">/* 见描述 */</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> set_exception_at_thread_exit<span class="br0">(</span>exception_ptr p<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
<span class="kw4">void</span> swap<span class="br0">(</span>promise<span class="sy1"><</span>R<span class="sy1">></span><span class="sy3">&</span> x, promise<span class="sy1"><</span>R<span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> Alloc<span class="sy1">></span>
|
|
<span class="kw1">struct</span> uses_allocator<span class="sy1"><</span>promise<span class="sy1"><</span>R<span class="sy1">></span>, Alloc<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::future">类模板 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
<span class="kw1">class</span> future <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
future<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
future<span class="br0">(</span>future<span class="sy3">&&</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
future<span class="br0">(</span><span class="kw4">const</span> future<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
~future<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
future<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> future<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
future<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>future<span class="sy3">&&</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
shared_future<span class="sy1"><</span>R<span class="sy1">></span> share<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 取得值</span>
|
|
<span class="coMULTI">/* 见描述 */</span> get<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// functions to check state</span>
|
|
<span class="kw4">bool</span> valid<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">void</span> wait<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Rep, <span class="kw1">class</span> Period<span class="sy1">></span>
|
|
future_status wait_for<span class="br0">(</span><span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration<span class="sy1">></span>
|
|
future_status wait_until<span class="br0">(</span><span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::shared_future">类模板 <span class="t-lc"><a href="cpp-thread-shared_future.html">std::shared_future</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
<span class="kw1">class</span> shared_future <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
shared_future<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
shared_future<span class="br0">(</span><span class="kw4">const</span> shared_future<span class="sy3">&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
shared_future<span class="br0">(</span>future<span class="sy1"><</span>R<span class="sy1">></span><span class="sy3">&&</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
shared_future<span class="br0">(</span>shared_future<span class="sy3">&&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
~shared_future<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
shared_future<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> shared_future<span class="sy3">&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
shared_future<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>shared_future<span class="sy3">&&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 取得值</span>
|
|
<span class="coMULTI">/* 见描述 */</span> get<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 检查状态的函数</span>
|
|
<span class="kw4">bool</span> valid<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">void</span> wait<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Rep, <span class="kw1">class</span> Period<span class="sy1">></span>
|
|
future_status wait_for<span class="br0">(</span><span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration<span class="sy1">></span>
|
|
future_status wait_until<span class="br0">(</span><span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::packaged_task">类模板 <span class="t-lc"><a href="cpp-thread-packaged_task.html">std::packaged_task</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span><span class="sy1">></span> <span class="kw1">class</span> packaged_task<span class="sy4">;</span> <span class="co1">// 不定义</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span>... <span class="me1">ArgTypes</span><span class="sy1">></span>
|
|
<span class="kw1">class</span> packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="co1">// 构造与析构</span>
|
|
packaged_task<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> F<span class="sy1">></span>
|
|
<span class="kw1">explicit</span> packaged_task<span class="br0">(</span>F<span class="sy3">&&</span> f<span class="br0">)</span><span class="sy4">;</span>
|
|
~packaged_task<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 无复制</span>
|
|
packaged_task<span class="br0">(</span><span class="kw4">const</span> packaged_task<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
packaged_task<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> packaged_task<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 移动支持</span>
|
|
packaged_task<span class="br0">(</span>packaged_task<span class="sy3">&&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
packaged_task<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>packaged_task<span class="sy3">&&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> swap<span class="br0">(</span>packaged_task<span class="sy3">&</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">bool</span> valid<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 结果取得</span>
|
|
future<span class="sy1"><</span>R<span class="sy1">></span> get_future<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 执行</span>
|
|
<span class="kw4">void</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>ArgTypes... <span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> make_ready_at_thread_exit<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">void</span> reset<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span>... <span class="me1">ArgTypes</span><span class="sy1">></span>
|
|
packaged_task<span class="br0">(</span>R <span class="br0">(</span><span class="sy2">*</span><span class="br0">)</span><span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> F<span class="sy1">></span> packaged_task<span class="br0">(</span>F<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> packaged_task<span class="sy1"><</span><span class="coMULTI">/* 见描述 */</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span>... <span class="me1">ArgTypes</span><span class="sy1">></span>
|
|
<span class="kw4">void</span> swap<span class="br0">(</span>packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span><span class="sy3">&</span> x, packaged_task<span class="sy1"><</span>R<span class="br0">(</span>ArgTypes...<span class="br0">)</span><span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|