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<title>Concept Transform</title>
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<a name="Transform"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Concept Transform</span></h2>
<p>Transform</p>
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<div class="refsect1">
<a name="idp470102368"></a><h2>Description</h2>
<p>
A Transform is a PrimitiveTransform, a CallableTransform
or an ObjectTransform.
</p>
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<div class="refsect1">
<a name="idp470103408"></a><h2>Associated types</h2>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p><span class="bold"><strong>result_type</strong></span></p>
<pre class="literallayout">boost::result_of<when< _, Tn >(Expr, State, Data)>::type</pre>
<p>
</p>
<p>The result of applying the Transform.</p>
<p>
</p>
</li></ul></div>
</div>
<div class="refsect1">
<a name="idp470106256"></a><h2>Notation</h2>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term">Tn</span></dt>
<dd>A type playing the role of transform-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd>
<dt><span class="term">Expr</span></dt>
<dd>A type playing the role of expression-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd>
<dt><span class="term">State</span></dt>
<dd>A type playing the role of state-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd>
<dt><span class="term">Data</span></dt>
<dd>A type playing the role of data-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd>
<dt><span class="term"><code class="varname">expr</code></span></dt>
<dd>Object of type Expr</dd>
<dt><span class="term"><code class="varname">state</code></span></dt>
<dd>Object of type State</dd>
<dt><span class="term"><code class="varname">data</code></span></dt>
<dd>Object of type Data</dd>
</dl></div>
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<div class="refsect1">
<a name="idp470116432"></a><h2>Valid expressions</h2>
<div class="informaltable"><table class="table">
<colgroup>
<col>
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<thead><tr>
<th>Name</th>
<th>Expression</th>
<th>Type</th>
<th>Semantics</th>
</tr></thead>
<tbody><tr>
<td><p>Apply Transform</p></td>
<td><p>when< _, Tn >()(expr, state, data)</p></td>
<td><p><span class="type">result_type</span></p></td>
<td><p>Applies the transform.</p></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="idp470120816"></a><h2>Models</h2>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="simplelist"><span class="type">boost::proto::_child(boost::proto::_left)</span></span></li></ul></div>
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<td align="right"><div class="copyright-footer">Copyright © 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>)
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