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<div class="refentry">
<a name="PrimitiveTransform"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Concept PrimitiveTransform</span></h2>
<p>PrimitiveTransform</p>
</div>
<div class="refsect1">
<a name="idm45555167932512"></a><h2>Description</h2>
<p>
A PrimitiveTransform is a class type that
has a nested class template called
<code class="computeroutput">impl<></code> that takes
three template parameters representing an expression
type, a state type and a data type. Specializations
of the nested impl template are ternary monomorphic
function objects that accept expression, state, and
data parameters. A PrimitiveTransform is also a
<a class="link" href="PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>
implemented in terms of the nested
<code class="computeroutput">impl<></code> template.
</p>
</div>
<div class="refsect1">
<a name="idm45555167928832"></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">typename Fn::template impl<Expr, State, Data>::result_type</pre>
<p>
</p>
<p>The return type of the overloaded function call operator.</p>
<p>
</p>
</li></ul></div>
</div>
<div class="refsect1">
<a name="idm45555167925920"></a><h2>Notation</h2>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term">Fn</span></dt>
<dd>A type playing the role of primitive-transform-type in the <a class="link" href="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</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="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</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="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</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="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept.</dd>
<dt><span class="term"><code class="varname">fn</code></span></dt>
<dd>Object of type Fn</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>
</div>
<div class="refsect1">
<a name="idm45555167914800"></a><h2>Valid expressions</h2>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Name</th>
<th>Expression</th>
<th>Type</th>
<th>Semantics</th>
</tr></thead>
<tbody>
<tr>
<td><p>Polymorphic Function Call 1</p></td>
<td><p>fn(expr)</p></td>
<td><p><span class="type">result_type</span></p></td>
<td><p>Applies the transform.</p></td>
</tr>
<tr>
<td><p>Polymorphic Function Call 2</p></td>
<td><p>fn(expr, state)</p></td>
<td><p><span class="type">result_type</span></p></td>
<td><p>Applies the transform.</p></td>
</tr>
<tr>
<td><p>Polymorphic Function Call 3</p></td>
<td><p>fn(expr, state, data)</p></td>
<td><p><span class="type">result_type</span></p></td>
<td><p>Applies the transform.</p></td>
</tr>
<tr>
<td><p>Monomorphic Function Call</p></td>
<td><p>typename Fn::template impl< Expr, State, Data >()(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="idm45555167904464"></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_c< 0 ></span></span></li></ul></div>
</div>
</div>
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<td align="left"></td>
<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>)
</p>
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