1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>uses_executor</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="use_future_t/use_future_t/overload2.html" title="use_future_t::use_future_t (2 of 2 overloads)"> 10<link rel="next" href="wait_traits.html" title="wait_traits"> 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="use_future_t/use_future_t/overload2.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="wait_traits.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.uses_executor"></a><a class="link" href="uses_executor.html" title="uses_executor">uses_executor</a> 28</h3></div></div></div> 29<p> 30 The <a class="link" href="uses_executor.html" title="uses_executor"><code class="computeroutput">uses_executor</code></a> 31 trait detects whether a type T has an associated executor that is convertible 32 from type Executor. 33 </p> 34<pre class="programlisting">template< 35 typename T, 36 typename <a class="link" href="Executor1.html" title="Executor requirements">Executor</a>> 37struct uses_executor : 38 public false_type 39</pre> 40<p> 41 Meets the BinaryTypeTrait requirements. The Asio library provides a definition 42 that is derived from <code class="computeroutput">false_type</code>. A program may specialize this 43 template to derive from true_type for a user-defined type T that can be constructed 44 with an executor, where the first argument of a constructor has type <a class="link" href="executor_arg_t.html" title="executor_arg_t"><code class="computeroutput">executor_arg_t</code></a> 45 and the second argument is convertible from type Executor. 46 </p> 47<h5> 48<a name="boost_asio.reference.uses_executor.h0"></a> 49 <span class="phrase"><a name="boost_asio.reference.uses_executor.requirements"></a></span><a class="link" href="uses_executor.html#boost_asio.reference.uses_executor.requirements">Requirements</a> 50 </h5> 51<p> 52 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/uses_executor.hpp</code> 53 </p> 54<p> 55 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 56 </p> 57</div> 58<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 59<td align="left"></td> 60<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 61 Kohlhoff<p> 62 Distributed under the Boost Software License, Version 1.0. (See accompanying 63 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>) 64 </p> 65</div></td> 66</tr></table> 67<hr> 68<div class="spirit-nav"> 69<a accesskey="p" href="use_future_t/use_future_t/overload2.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="wait_traits.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 70</div> 71</body> 72</html> 73
