1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>is_async_read_stream</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="../../index.html" title="Chapter 1. Boost.Beast"> 8<link rel="up" href="../ref.html" title="This Page Intentionally Left Blank 2/2"> 9<link rel="prev" href="boost__beast__is_sync_stream.html" title="is_sync_stream"> 10<link rel="next" href="boost__beast__is_async_write_stream.html" title="is_async_write_stream"> 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="boost__beast__is_sync_stream.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost__beast__is_async_write_stream.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="beast.ref.boost__beast__is_async_read_stream"></a><a class="link" href="boost__beast__is_async_read_stream.html" title="is_async_read_stream">is_async_read_stream</a> 28</h4></div></div></div> 29<p> 30 <a class="indexterm" name="idm46057514098832"></a> 31 </p> 32<p> 33 Determine if <code class="computeroutput"><span class="identifier">T</span></code> meets the 34 requirements of <span class="emphasis"><em>AsyncReadStream</em></span>. 35 </p> 36<h5> 37<a name="beast.ref.boost__beast__is_async_read_stream.h0"></a> 38 <span class="phrase"><a name="beast.ref.boost__beast__is_async_read_stream.synopsis"></a></span><a class="link" href="boost__beast__is_async_read_stream.html#beast.ref.boost__beast__is_async_read_stream.synopsis">Synopsis</a> 39 </h5> 40<p> 41 Defined in header <code class="literal"><<a href="../../../../../../boost/beast/core/stream_traits.hpp" target="_top">boost/beast/core/stream_traits.hpp</a>></code> 42 </p> 43<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> 44 <span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> 45<span class="keyword">using</span> <span class="identifier">is_async_read_stream</span> <span class="special">=</span> <span class="emphasis"><em>see-below</em></span><span class="special">;</span> 46</pre> 47<h5> 48<a name="beast.ref.boost__beast__is_async_read_stream.h1"></a> 49 <span class="phrase"><a name="beast.ref.boost__beast__is_async_read_stream.description"></a></span><a class="link" href="boost__beast__is_async_read_stream.html#beast.ref.boost__beast__is_async_read_stream.description">Description</a> 50 </h5> 51<p> 52 Metafunctions are used to perform compile time checking of template types. 53 This type will be <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">true_type</span></code> if <code class="computeroutput"><span class="identifier">T</span></code> 54 meets the requirements, else the type will be <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">false_type</span></code>. 55 </p> 56<h5> 57<a name="beast.ref.boost__beast__is_async_read_stream.h2"></a> 58 <span class="phrase"><a name="beast.ref.boost__beast__is_async_read_stream.example"></a></span><a class="link" href="boost__beast__is_async_read_stream.html#beast.ref.boost__beast__is_async_read_stream.example">Example</a> 59 </h5> 60<p> 61 Use with <code class="computeroutput"><span class="keyword">static_assert</span></code>: 62 </p> 63<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">AsyncReadStream</span><span class="special">></span> 64<span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">AsyncReadStream</span><span class="special">&</span> <span class="identifier">stream</span><span class="special">)</span> 65<span class="special">{</span> 66 <span class="keyword">static_assert</span><span class="special">(</span><span class="identifier">is_async_read_stream</span><span class="special"><</span><span class="identifier">AsyncReadStream</span><span class="special">>::</span><span class="identifier">value</span><span class="special">,</span> 67 <span class="string">"AsyncReadStream type requirements not met"</span><span class="special">);</span> 68<span class="special">...</span> 69</pre> 70<p> 71 Use with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span></code> (SFINAE): 72 </p> 73<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">AsyncReadStream</span><span class="special">></span> 74<span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special"><</span><span class="identifier">is_async_read_stream</span><span class="special"><</span><span class="identifier">AsyncReadStream</span><span class="special">>::</span><span class="identifier">value</span><span class="special">>::</span><span class="identifier">type</span> 75<span class="identifier">f</span><span class="special">(</span><span class="identifier">AsyncReadStream</span><span class="special">&</span> <span class="identifier">stream</span><span class="special">);</span> 76</pre> 77</div> 78<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 79<td align="left"></td> 80<td align="right"><div class="copyright-footer">Copyright © 2016-2019 Vinnie 81 Falco<p> 82 Distributed under the Boost Software License, Version 1.0. (See accompanying 83 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>) 84 </p> 85</div></td> 86</tr></table> 87<hr> 88<div class="spirit-nav"> 89<a accesskey="p" href="boost__beast__is_sync_stream.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost__beast__is_async_write_stream.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 90</div> 91</body> 92</html> 93
