1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>execution::can_start</title> 5<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../reference.html" title="Reference"> 9<link rel="prev" href="execution__can_set_value.html" title="execution::can_set_value"> 10<link rel="next" href="execution__can_submit.html" title="execution::can_submit"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 15<td align="center"><a href="../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="execution__can_set_value.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="execution__can_submit.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_asio.reference.execution__can_start"></a><a class="link" href="execution__can_start.html" title="execution::can_start">execution::can_start</a> 28</h3></div></div></div> 29<p> 30 A type trait that determines whether a <code class="computeroutput">start</code> expression is well-formed. 31 </p> 32<pre class="programlisting">template< 33 typename R> 34struct can_start 35</pre> 36<p> 37 Class template <code class="computeroutput">can_start</code> is a trait that is derived from <code class="computeroutput">true_type</code> 38 if the expression <code class="computeroutput">execution::start(std::declval<R>(), std::declval<E>())</code> 39 is well formed; otherwise <code class="computeroutput">false_type</code>. 40 </p> 41<h5> 42<a name="boost_asio.reference.execution__can_start.h0"></a> 43 <span class="phrase"><a name="boost_asio.reference.execution__can_start.requirements"></a></span><a class="link" href="execution__can_start.html#boost_asio.reference.execution__can_start.requirements">Requirements</a> 44 </h5> 45<p> 46 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/execution/start.hpp</code> 47 </p> 48<p> 49 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio/execution.hpp</code> 50 </p> 51</div> 52<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 53<td align="left"></td> 54<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 55 Kohlhoff<p> 56 Distributed under the Boost Software License, Version 1.0. (See accompanying 57 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 58 </p> 59</div></td> 60</tr></table> 61<hr> 62<div class="spirit-nav"> 63<a accesskey="p" href="execution__can_set_value.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="execution__can_submit.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 64</div> 65</body> 66</html> 67
