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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
| 27 | <a name="boost_functiontypes.introduction"></a><a class="link" href="introduction.html" title="Introduction">Introduction</a> | |
| 28 | </h2></div></div></div> | |
| 29 | <p> | |
| 30 | Boost.FunctionTypes provides functionality to classify, decompose and synthesize | |
| 31 | function, function pointer, function reference and pointer to member types. | |
| 32 | </p> | |
| 33 | <p> | |
| 34 | We collectively refer to these types as <span class="emphasis"><em>callable builtin</em></span> | |
| 35 | types. | |
| 36 | </p> | |
| 37 | <p> | |
| 38 | In particular, the library can be used to: | |
| 39 | </p> | |
| 40 | <div class="itemizedlist"><ul class="itemizedlist" type="disc"> | |
| 41 | <li class="listitem"> | |
| 42 | test whether a type is a specific callable, builtin type, | |
| 43 | </li> | |
| 44 | <li class="listitem"> | |
| 45 | extract all component properties from callable, builtin types, and | |
| 46 | </li> | |
| 47 | <li class="listitem"> | |
| 48 | create callable, builtin types from specified properties. | |
| 49 | </li> | |
| 50 | </ul></div> | |
| 51 | <p> | |
| 52 | The library is designed to work well with other Boost libraries and uses well-accepted | |
| 53 | concepts introduced by Boost and TR1. | |
| 54 | </p> | |
| 55 | <p> | |
| 56 | Templates that encapsulate boolean or numeric properties define a static member | |
| 57 | constant called <code class="literal">value</code>. | |
| 58 | </p> | |
| 59 | <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 | |
| 60 | </span> | |
| 61 | <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 | |
| 62 | </span></pre> | |
| 63 | <p> | |
| 64 | Templates that encapsulate properties that are single types contain a type | |
| 65 | member called <code class="literal">type</code>. | |
| 66 | </p> | |
| 67 | <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) | |
| 68 | </span> | |
| 69 | <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 | |
| 70 | </span></pre> | |
| 71 | <p> | |
| 72 | Templates that encapsulate properties that are type lists model an MPL-compatible | |
| 73 | type sequence. | |
| 74 | </p> | |
| 75 | <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 | |
| 76 | </span></pre> | |
| 77 | </div> | |
| 78 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 79 | <td align="left"></td> | |
| 80 | <td align="right"><div class="copyright-footer">Copyright © 2004-2007 Tobias | |
| 81 | Schwinger<p> | |
| 82 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 83 | 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>) | |
| 84 | </p> | |
| 85 | </div></td> | |
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