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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="beast.ref.boost__beast__is_async_stream"></a><a class="link" href="boost__beast__is_async_stream.html" title="is_async_stream">is_async_stream</a>
  28 </h4></div></div></div>
  29 <p>
  30         <a class="indexterm" name="idm45873487831904"></a>
  31 Determine if <code class="computeroutput"><span class="identifier">T</span></code>
  32         meets the requirements of <span class="bold"><strong>AsyncStream</strong></span>.
  33       </p>
  34 <h5>
  35 <a name="beast.ref.boost__beast__is_async_stream.h0"></a>
  36         <span class="phrase"><a name="beast.ref.boost__beast__is_async_stream.synopsis"></a></span><a class="link" href="boost__beast__is_async_stream.html#beast.ref.boost__beast__is_async_stream.synopsis">Synopsis</a>
  37       </h5>
  38 <p>
  39         Defined in header <code class="literal">&lt;<a href="../../../../../../boost/beast/core/stream_traits.hpp" target="_top">boost/beast/core/stream_traits.hpp</a>&gt;</code>
  40       </p>
  41 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
  42     <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
  43 <span class="keyword">using</span> <span class="identifier">is_async_stream</span> <span class="special">=</span> <span class="emphasis"><em>see-below</em></span><span class="special">;</span>
  44 </pre>
  45 <h5>
  46 <a name="beast.ref.boost__beast__is_async_stream.h1"></a>
  47         <span class="phrase"><a name="beast.ref.boost__beast__is_async_stream.description"></a></span><a class="link" href="boost__beast__is_async_stream.html#beast.ref.boost__beast__is_async_stream.description">Description</a>
  48       </h5>
  49 <p>
  50         Metafunctions are used to perform compile time checking of template types.
  51         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>
  52         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>.
  53       </p>
  54 <h5>
  55 <a name="beast.ref.boost__beast__is_async_stream.h2"></a>
  56         <span class="phrase"><a name="beast.ref.boost__beast__is_async_stream.example"></a></span><a class="link" href="boost__beast__is_async_stream.html#beast.ref.boost__beast__is_async_stream.example">Example</a>
  57       </h5>
  58 <p>
  59         Use with <code class="computeroutput"><span class="keyword">static_assert</span></code>:
  60       </p>
  61 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">AsyncStream</span><span class="special">&gt;</span>
  62 <span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">AsyncStream</span><span class="special">&amp;</span> <span class="identifier">stream</span><span class="special">)</span>
  63 <span class="special">{</span>
  64     <span class="keyword">static_assert</span><span class="special">(</span><span class="identifier">is_async_stream</span><span class="special">&lt;</span><span class="identifier">AsyncStream</span><span class="special">&gt;::</span><span class="identifier">value</span><span class="special">,</span>
  65         <span class="string">"AsyncStream type requirements not met"</span><span class="special">);</span>
  66 <span class="special">...</span>
  67 </pre>
  68 <p>
  69         Use with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span></code> (SFINAE):
  70       </p>
  71 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">AsyncStream</span><span class="special">&gt;</span>
  72 <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special">&lt;</span><span class="identifier">is_async_stream</span><span class="special">&lt;</span><span class="identifier">AsyncStream</span><span class="special">&gt;::</span><span class="identifier">value</span><span class="special">&gt;::</span><span class="identifier">type</span>
  73 <span class="identifier">f</span><span class="special">(</span><span class="identifier">AsyncStream</span><span class="special">&amp;</span> <span class="identifier">stream</span><span class="special">);</span>
  74 </pre>
  75 <p>
  76         Convenience header <code class="literal">&lt;<a href="../../../../../../boost/beast/core.hpp" target="_top">boost/beast/core.hpp</a>&gt;</code>
  77       </p>
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  84         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>)
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