<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Introduction</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="../index.html" title="Chapter 1. Boost.FunctionTypes 2.5"> <link rel="prev" href="../index.html" title="Chapter 1. Boost.FunctionTypes 2.5"> <link rel="next" href="use_cases.html" title="Use Cases"> </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="../index.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.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="use_cases.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="boost_functiontypes.introduction"></a><a class="link" href="introduction.html" title="Introduction"> Introduction</a> </h2></div></div></div> <p> Boost.FunctionTypes provides functionality to classify, decompose and synthesize function, function pointer, function reference and pointer to member types. </p> <p> We collectively refer to these types as <span class="emphasis"><em>callable builtin</em></span> types. </p> <p> In particular, the library can be used to: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> test whether a type is a specific callable, builtin type, </li> <li class="listitem"> extract all component properties from callable, builtin types, and </li> <li class="listitem"> create callable, builtin types from specified properties. </li> </ul></div> <p> The library is designed to work well with other Boost libraries and uses well-accepted concepts introduced by Boost and TR1. </p> <p> Templates that encapsulate boolean or numeric properties define a static member constant called <code class="literal">value</code>. </p> <pre class="programlisting"><a class="link" href="reference/classification.html#boost_functiontypes.reference.classification.is_function_pointer" title="is_function_pointer">is_function_pointer</a><span class="special"><</span> <span class="keyword">bool</span><span class="special">(*)(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">value</span> <span class="comment">// == true </span> <a class="link" href="reference/decomposition.html#boost_functiontypes.reference.decomposition.function_arity" title="function_arity">function_arity</a><span class="special"><</span> <span class="keyword">bool</span><span class="special">(*)(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">value</span> <span class="comment">// == 1 </span></pre> <p> Templates that encapsulate properties that are single types contain a type member called <code class="literal">type</code>. </p> <pre class="programlisting"><a class="link" href="reference/synthesis.html#boost_functiontypes.reference.synthesis.function_type" title="function_type">function_type</a><span class="special"><</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span><span class="keyword">int</span><span class="special">></span> <span class="special">>::</span><span class="identifier">type</span> <span class="comment">// is bool(int) </span> <a class="link" href="reference/decomposition.html#boost_functiontypes.reference.decomposition.result_type" title="result_type">result_type</a><span class="special"><</span> <span class="keyword">bool</span><span class="special">(&)(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">type</span> <span class="comment">// is bool </span></pre> <p> Templates that encapsulate properties that are type lists model an MPL-compatible type sequence. </p> <pre class="programlisting"><a class="link" href="reference/decomposition.html#boost_functiontypes.reference.decomposition.parameter_types" title="parameter_types">parameter_types</a><span class="special"><</span> <span class="keyword">bool</span><span class="special">(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">></span> <span class="comment">// models an MPL sequence </span></pre> </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="../index.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.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="use_cases.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>