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| <a name="CallableTransform"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Concept CallableTransform</span></h2> |
| <p>CallableTransform</p> |
| </div> |
| <div class="refsect1"> |
| <a name="id2606513"></a><h2>Description</h2> |
| <p> |
| A CallableTransform is a function type or a function |
| pointer type where the return type Fn is a |
| PolymorphicFunctionObject and the arguments are |
| Transforms. is_callable< Fn >::value |
| must be true. The CallableTransform, when applied, |
| has the effect of invoking the polymorphic function |
| object Fn, passing as arguments the result(s) |
| of applying transform(s) Tn. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="id2606524"></a><h2>Associated types</h2> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <p><span class="bold"><strong>result_type</strong></span></p> |
| <pre class="literallayout">boost::result_of<Fn(Transform<Tn, Expr, State, Data>::result_type...)>::type</pre> |
| <p> |
| </p> |
| <p>The result of applying the CallableTransform.</p> |
| <p> |
| </p> |
| </li></ul></div> |
| </div> |
| <div class="refsect1"> |
| <a name="id2606546"></a><h2>Notation</h2> |
| <div class="variablelist"><dl> |
| <dt><span class="term">Fn</span></dt> |
| <dd>A type playing the role of polymorphic-function-object-type in the <a class="link" href="CallableTransform.html" title="Concept CallableTransform">CallableTransform</a> concept.</dd> |
| <dt><span class="term">Tn</span></dt> |
| <dd>A type playing the role of transform-type in the <a class="link" href="CallableTransform.html" title="Concept CallableTransform">CallableTransform</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="CallableTransform.html" title="Concept CallableTransform">CallableTransform</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="CallableTransform.html" title="Concept CallableTransform">CallableTransform</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="CallableTransform.html" title="Concept CallableTransform">CallableTransform</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="id2606661"></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>Apply Transform</p></td> |
| <td><p>when< _, Fn(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="id2606698"></a><h2>Models</h2> |
| <div class="itemizedlist"><ul class="itemizedlist" 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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