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<title>Function make_expr</title>
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<div class="refentry" title="Function make_expr">
<a name="boost.proto.make_expr_id1241909"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Function make_expr</span></h2>
<p>boost::proto::make_expr &#8212; Construct an expression of the requested tag type with a domain and with the specified
          arguments as children.</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: &lt;<a class="link" href="../../proto/reference.html#header.boost.proto.make_expr_hpp" title="Header &lt;boost/proto/make_expr.hpp&gt;">boost/proto/make_expr.hpp</a>&gt;

</em></span>
<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Tag, <span class="bold"><strong>typename</strong></span>... A&gt; 
  <span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a>&lt;Tag, A <span class="bold"><strong>const</strong></span>...&gt;::type <span class="bold"><strong>const</strong></span></span> 
  make_expr(A <span class="bold"><strong>const</strong></span> &amp;... a);
<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Tag, <span class="bold"><strong>typename</strong></span> Domain, <span class="bold"><strong>typename</strong></span>... A&gt; 
  <span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a>&lt;Tag, Domain, A <span class="bold"><strong>const</strong></span>...&gt;::type <span class="bold"><strong>const</strong></span></span> 
  make_expr(A <span class="bold"><strong>const</strong></span> &amp;... a);</pre></div>
<div class="refsect1" title="Description">
<a name="id1596272"></a><h2>Description</h2>
<p>
            This function template may be invoked either with or without specifying a
            <code class="computeroutput">Domain</code> template parameter. If no domain is specified, the domain
            is deduced by examining in order the domains of the given arguments and taking the first that is
            not <code class="computeroutput"><code class="computeroutput"><a class="link" href="default_domain.html" title="Struct default_domain">proto::default_domain</a></code></code>, if any such
            domain exists, or <code class="computeroutput"><code class="computeroutput"><a class="link" href="default_domain.html" title="Struct default_domain">proto::default_domain</a></code></code>
            otherwise.
          </p>
<p>
            Let <code class="computeroutput"><em class="replaceable"><code>WRAP</code></em>(x)</code> be defined such that:
            </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
                  If <code class="computeroutput">x</code> is a <code class="computeroutput">boost::reference_wrapper&lt;&gt;</code>,
                  <code class="computeroutput"><em class="replaceable"><code>WRAP</code></em>(x)</code> is equivalent to
                  <code class="computeroutput"><code class="computeroutput"><a class="link" href="as_child_id1264710.html" title="Function as_child">proto::as_child</a></code>&lt;Domain&gt;(x.get())</code>.
                </p></li>
<li class="listitem"><p>
                  Otherwise, <code class="computeroutput"><em class="replaceable"><code>WRAP</code></em>(x)</code> is equivalent to
                  <code class="computeroutput"><code class="computeroutput"><a class="link" href="as_expr_id1264483.html" title="Function as_expr">proto::as_expr</a></code>&lt;Domain&gt;(x)</code>.
                </p></li>
</ul></div>
<p>
            Let <code class="computeroutput"><em class="replaceable"><code>MAKE</code></em>&lt;Tag&gt;(a...)</code> be defined as
            <code class="computeroutput"><code class="computeroutput"><a class="link" href="expr.html" title="Struct template expr">proto::expr</a></code>&lt;Tag,
            <code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::listN</a></code>&lt;A...&gt; &gt;::make(a...)</code>
            where
            <code class="computeroutput">A<sub>x</sub></code> is the type of 
            <code class="computeroutput">a<sub>x</sub></code>.
          </p>
<p>
          </p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
            <code class="computeroutput">Domain()(<em class="replaceable"><code>MAKE</code></em>&lt;Tag&gt;(<em class="replaceable"><code>WRAP</code></em>(a)...))</code>.
          </p></td>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        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>)
      </p>
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