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27 <a name="beast.ref.boost__beast__http__is_body_writer"></a><a class="link" href="boost__beast__http__is_body_writer.html" title="http::is_body_writer">http::is_body_writer</a>
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31 Determine if a type has a nested <span class="emphasis"><em>BodyWriter</em></span>.
34 <a name="beast.ref.boost__beast__http__is_body_writer.h0"></a>
35 <span class="phrase"><a name="beast.ref.boost__beast__http__is_body_writer.synopsis"></a></span><a class="link" href="boost__beast__http__is_body_writer.html#beast.ref.boost__beast__http__is_body_writer.synopsis">Synopsis</a>
38 Defined in header <code class="literal"><<a href="../../../../../../boost/beast/http/type_traits.hpp" target="_top">boost/beast/http/type_traits.hpp</a>></code>
40 <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
41 <span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span>
42 <span class="keyword">using</span> <span class="identifier">is_body_writer</span> <span class="special">=</span> <span class="emphasis"><em>see-below</em></span><span class="special">;</span>
45 <a name="beast.ref.boost__beast__http__is_body_writer.h1"></a>
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49 This alias template is <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">true_type</span></code>
52 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
54 <code class="computeroutput"><span class="identifier">T</span></code> has a nested type named
55 <code class="computeroutput"><span class="identifier">writer</span></code>
58 <code class="computeroutput"><span class="identifier">writer</span></code> meets the requirements
59 of <span class="emphasis"><em>BodyWriter</em></span>.
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67 <div class="informaltable"><table class="table">
87 <code class="computeroutput"><span class="identifier">T</span></code>
92 The body type to test.
98 <a name="beast.ref.boost__beast__http__is_body_writer.h3"></a>
99 <span class="phrase"><a name="beast.ref.boost__beast__http__is_body_writer.example"></a></span><a class="link" href="boost__beast__http__is_body_writer.html#beast.ref.boost__beast__http__is_body_writer.example">Example</a>
101 <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">bool</span> <span class="identifier">isRequest</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Body</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Fields</span><span class="special">></span>
102 <span class="keyword">void</span> <span class="identifier">check_can_serialize</span><span class="special">(</span><span class="identifier">message</span><span class="special"><</span><span class="identifier">isRequest</span><span class="special">,</span> <span class="identifier">Body</span><span class="special">,</span> <span class="identifier">Fields</span><span class="special">></span> <span class="keyword">const</span><span class="special">&)</span>
103 <span class="special">{</span>
104 <span class="keyword">static_assert</span><span class="special">(</span><span class="identifier">is_body_writer</span><span class="special"><</span><span class="identifier">Body</span><span class="special">>::</span><span class="identifier">value</span><span class="special">,</span>
105 <span class="string">"Cannot serialize Body, no reader"</span><span class="special">);</span>
106 <span class="special">}</span>
109 Convenience header <code class="literal"><<a href="../../../../../../boost/beast/http.hpp" target="_top">boost/beast/http.hpp</a>></code>
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116 Distributed under the Boost Software License, Version 1.0. (See accompanying
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