1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>can_require_concept</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="can_require.html" title="can_require"> 10<link rel="next" href="co_spawn.html" title="co_spawn"> 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="can_require.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="co_spawn.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.can_require_concept"></a><a class="link" href="can_require_concept.html" title="can_require_concept">can_require_concept</a> 28</h3></div></div></div> 29<p> 30 A type trait that determines whether a <code class="computeroutput">require_concept</code> expression 31 is well-formed. 32 </p> 33<pre class="programlisting">template< 34 typename T, 35 typename Property> 36struct can_require_concept 37</pre> 38<p> 39 Class template <code class="computeroutput">can_require_concept</code> is a trait that is derived 40 from <code class="computeroutput">true_type</code> if the expression <code class="computeroutput">boost::asio::require_concept(std::declval<T>(), 41 std::declval<Property>())</code> is well formed; otherwise <code class="computeroutput">false_type</code>. 42 </p> 43<h5> 44<a name="boost_asio.reference.can_require_concept.h0"></a> 45 <span class="phrase"><a name="boost_asio.reference.can_require_concept.requirements"></a></span><a class="link" href="can_require_concept.html#boost_asio.reference.can_require_concept.requirements">Requirements</a> 46 </h5> 47<p> 48 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/require_concept.hpp</code> 49 </p> 50<p> 51 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 52 </p> 53</div> 54<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 55<td align="left"></td> 56<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 57 Kohlhoff<p> 58 Distributed under the Boost Software License, Version 1.0. (See accompanying 59 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>) 60 </p> 61</div></td> 62</tr></table> 63<hr> 64<div class="spirit-nav"> 65<a accesskey="p" href="can_require.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="co_spawn.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 66</div> 67</body> 68</html> 69
