<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class templates for type decomposition</title> <link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../index.html" title="Chapter 1. Boost.FunctionTypes 2.5"> <link rel="up" href="../reference.html" title="Reference"> <link rel="prev" href="classification.html" title="Class templates for type classification"> <link rel="next" href="synthesis.html" title="Class templates for type synthesis"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="classification.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="synthesis.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="boost_functiontypes.reference.decomposition"></a><a class="link" href="decomposition.html" title="Class templates for type decomposition"> Class templates for type decomposition</a> </h3></div></div></div> <div class="toc"><dl> <dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.result_type"> result_type</a></span></dt> <dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.parameter_types"> parameter_types</a></span></dt> <dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.function_arity"> function_arity</a></span></dt> <dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.components"> components</a></span></dt> </dl></div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_functiontypes.reference.decomposition.result_type"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.result_type" title="result_type"> result_type</a> </h4></div></div></div> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">F</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">result_type</span><span class="special">;</span> </pre> <p> <span class="bold"><strong>Header</strong></span> </p> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">result_type</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term"><code class="literal">F</code></span></dt> <dd><p> Type to analyze </p></dd> <dt><span class="term"><code class="literal">result_type<F>::type</code></span></dt> <dd><p> Result type of <code class="literal">F</code> </p></dd> </dl> </div> <p> Extracts the result type of a callable, builtin type. </p> <p> If <code class="literal">F</code> is no callable, builtin type, any attempt to access the <code class="literal">type</code> member results in a compile error. </p> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_functiontypes.reference.decomposition.parameter_types"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.parameter_types" title="parameter_types"> parameter_types</a> </h4></div></div></div> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">F</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ClassTransform</span> <span class="special">=</span> <span class="identifier">add_reference</span><span class="special"><</span><span class="identifier">_</span><span class="special">></span> <span class="special">></span> <span class="keyword">struct</span> <span class="identifier">parameter_types</span><span class="special">;</span> </pre> <p> <span class="bold"><strong>Header</strong></span> </p> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">parameter_types</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term"><code class="literal">F</code></span></dt> <dd><p> Type to analyze </p></dd> <dt><span class="term"><code class="literal">ClassTransform</code></span></dt> <dd><p> <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/lambda-expression.html" target="_top">Lambda Expression</a> to transform the class type if <code class="literal">F</code> is a member function pointer </p></dd> <dt><span class="term"><code class="literal">parameter_types<F,ClassTransform></code></span></dt> <dd><p> <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/front-extensible-sequence.html" target="_top">Front</a> / <a href="../../../../../mpl/doc/refmanual/back-extensible-sequence.html" target="_top">Back </a><a href="../../../../../mpl/doc/refmanual/extensible-sequence.html" target="_top">Extensible </a><a href="../../../../../mpl/doc/refmanual/random-access-sequence.html" target="_top">Random Access Sequence</a> of parameter types </p></dd> </dl> </div> <p> Extracts the parameter types of a callable, builtin type. </p> <p> If <code class="literal">F</code> is no callable, builtin type, any attempt to access the sequence results in a compile error. </p> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_functiontypes.reference.decomposition.function_arity"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.function_arity" title="function_arity"> function_arity</a> </h4></div></div></div> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">F</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">function_arity</span><span class="special">;</span> </pre> <p> <span class="bold"><strong>Header</strong></span> </p> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">function_arity</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term"><code class="literal">F</code></span></dt> <dd><p> Callable builtin type </p></dd> <dt><span class="term"><code class="literal">function_arity<F></code></span></dt> <dd><p> Function arity as <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">Integral Constant</a> </p></dd> <dt><span class="term"><code class="literal">function_arity<F>::value</code></span></dt> <dd><p> Constant value of the function arity </p></dd> </dl> </div> <p> Extracts the function arity, that is the number of parameters. The hidden <code class="literal">this</code> of member function pointers counts, in other words the arity value is always greater than or equal to one if <code class="literal">F</code> is a member function pointer. </p> <p> If <code class="literal">F</code> is no callable, builtin type, any attempt to access the value results in a compile error. </p> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_functiontypes.reference.decomposition.components"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.components" title="components"> components</a> </h4></div></div></div> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ClassTransform</span> <span class="special">=</span> <span class="identifier">add_reference</span><span class="special"><</span><span class="identifier">_</span><span class="special">></span> <span class="special">></span> <span class="keyword">struct</span> <span class="identifier">components</span><span class="special">;</span> </pre> <p> <span class="bold"><strong>Header</strong></span> </p> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">components</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term"><code class="literal">T</code></span></dt> <dd><p> Type to analyze </p></dd> <dt><span class="term"><code class="literal">ClassTransform</code></span></dt> <dd><p> <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/lambda-expression.html" target="_top">Lambda Expression</a> to transform the class type if <code class="literal">T</code> is a member function pointer </p></dd> <dt><span class="term"><code class="literal">components<T,ClassTransform></code></span></dt> <dd><p> <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/front-extensible-sequence.html" target="_top">Front</a> / <a href="../../../../../mpl/doc/refmanual/back-extensible-sequence.html" target="_top">Back </a><a href="../../../../../mpl/doc/refmanual/extensible-sequence.html" target="_top">Extensible </a><a href="../../../../../mpl/doc/refmanual/random-access-sequence.html" target="_top">Random Access Sequence</a> of all component types and property tag </p></dd> <dt><span class="term"><code class="literal">components<T,ClassTransform>::types</code></span></dt> <dd><p> Decorated MPL Sequence, exposed for optimization </p></dd> </dl> </div> <p> Extracts all properties of a callable builtin type, that is the result type, followed by the parameter types (including the type of <code class="literal">this</code> for member function pointers). </p> <p> If <code class="literal">T</code> is no callable builtin type, the component types are an empty sequence and the Tag's meaning is equivalent to the <code class="literal"><a class="link" href="tag_types.html#boost_functiontypes.reference.tag_types.null_tag" title="null_tag">null_tag</a></code>. </p> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2004 -2007 Tobias Schwinger<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> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="classification.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="synthesis.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>