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| <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> |
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| <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>) |
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