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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="fusion.functional.concepts.def_callable"></a><a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred Callable
  28         Object</a>
  29 </h4></div></div></div>
  30 <h6>
  31 <a name="fusion.functional.concepts.def_callable.h0"></a>
  32           <span class="phrase"><a name="fusion.functional.concepts.def_callable.description"></a></span><a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.description">Description</a>
  33         </h6>
  34 <p>
  35           <a class="link" href="callable.html" title="Callable Object">Callable Object</a>
  36           types that work with <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a>
  37           to determine the result of a call.
  38         </p>
  39 <h6>
  40 <a name="fusion.functional.concepts.def_callable.h1"></a>
  41           <span class="phrase"><a name="fusion.functional.concepts.def_callable.refinement_of"></a></span><a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.refinement_of">Refinement
  42           of</a>
  43         </h6>
  44 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
  45               <a class="link" href="callable.html" title="Callable Object">Callable Object</a>
  46             </li></ul></div>
  47 <div class="sidebar">
  48 <div class="titlepage"></div>
  49 <p>
  50           note Once C++ supports the <code class="literal">decltype</code> keyword, all models
  51           of <a class="link" href="callable.html" title="Callable Object">Callable Object</a>
  52           will also be models of <a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred
  53           Callable Object</a>, because function objects won't need client-side
  54           support for <code class="computeroutput"><span class="identifier">result_of</span></code>.
  55         </p>
  56 </div>
  57 <div class="variablelist">
  58 <p class="title"><b>Notation</b></p>
  59 <dl class="variablelist">
  60 <dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
  61 <dd><p>
  62                 A possibly const qualified Deferred Callable Object type
  63               </p></dd>
  64 <dt><span class="term"><code class="computeroutput"><span class="identifier">A1</span> <span class="special">...</span><span class="identifier">AN</span></code></span></dt>
  65 <dd><p>
  66                 Argument types
  67               </p></dd>
  68 <dt><span class="term"><code class="computeroutput"><span class="identifier">a1</span> <span class="special">...</span><span class="identifier">aN</span></code></span></dt>
  69 <dd><p>
  70                 Objects or references to objects with types <code class="computeroutput"><span class="identifier">A1</span>
  71                 <span class="special">...</span><span class="identifier">AN</span></code>
  72               </p></dd>
  73 <dt><span class="term"><code class="computeroutput"><span class="identifier">T1</span> <span class="special">...</span><span class="identifier">TN</span></code></span></dt>
  74 <dd><p>
  75                 <code class="computeroutput"><span class="identifier">T</span></code>i is <code class="computeroutput"><span class="identifier">A</span></code>i <code class="computeroutput"><span class="special">&amp;</span></code>
  76                 if <code class="computeroutput"><span class="identifier">a</span></code>i is an LValue,
  77                 same as <code class="computeroutput"><span class="identifier">A</span></code>i, otherwise
  78               </p></dd>
  79 </dl>
  80 </div>
  81 <h6>
  82 <a name="fusion.functional.concepts.def_callable.h2"></a>
  83           <span class="phrase"><a name="fusion.functional.concepts.def_callable.expression_requirements"></a></span><a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.expression_requirements">Expression
  84           requirements</a>
  85         </h6>
  86 <div class="informaltable"><table class="table">
  87 <colgroup>
  88 <col>
  89 <col>
  90 </colgroup>
  91 <thead><tr>
  92 <th>
  93                   <p>
  94                     Expression
  95                   </p>
  96                 </th>
  97 <th>
  98                   <p>
  99                     Type
 100                   </p>
 101                 </th>
 102 </tr></thead>
 103 <tbody><tr>
 104 <td>
 105                   <p>
 106                     <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></a><code class="computeroutput"><span class="special">&lt;</span> <span class="identifier">F</span><span class="special">(</span><span class="identifier">T1</span>
 107                     <span class="special">...</span><span class="identifier">TN</span><span class="special">)</span> <span class="special">&gt;::</span><span class="identifier">type</span></code>
 108                   </p>
 109                 </td>
 110 <td>
 111                   <p>
 112                     Result of a call with <code class="computeroutput"><span class="identifier">A1</span>
 113                     <span class="special">...</span><span class="identifier">AN</span></code>-typed
 114                     arguments
 115                   </p>
 116                 </td>
 117 </tr></tbody>
 118 </table></div>
 119 <h6>
 120 <a name="fusion.functional.concepts.def_callable.h3"></a>
 121           <span class="phrase"><a name="fusion.functional.concepts.def_callable.models"></a></span><a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.models">Models</a>
 122         </h6>
 123 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 124 <li class="listitem">
 125               <a class="link" href="poly.html" title="Polymorphic Function Object">Polymorphic Function
 126               Object</a> types
 127             </li>
 128 <li class="listitem">
 129               member (function or data) pointer types
 130             </li>
 131 </ul></div>
 132 <h6>
 133 <a name="fusion.functional.concepts.def_callable.h4"></a>
 134           <span class="phrase"><a name="fusion.functional.concepts.def_callable.examples"></a></span><a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.examples">Examples</a>
 135         </h6>
 136 <pre class="programlisting"><span class="special">&amp;</span> <span class="identifier">a_free_function</span>
 137 <span class="special">&amp;</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_static_member_function</span>
 138 <span class="special">&amp;</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_nonstatic_data_member</span>
 139 <span class="special">&amp;</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_nonstatic_member_function</span>
 140 <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;()</span>
 141 <span class="comment">// using namespace boost;</span>
 142 <span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;(),</span> <span class="identifier">_1</span><span class="special">,</span> <span class="number">5</span><span class="special">)</span>
 143 <span class="comment">// Note: Boost.Lambda expressions don't work with __boost_result_of__</span>
 144 <span class="identifier">fusion</span><span class="special">::</span><a class="link" href="../generation/functions/mk_fused_fobj.html" title="make_fused_function_object"><code class="computeroutput"><span class="identifier">make_fused_function_object</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;())</span>
 145 </pre>
 146 </div>
 147 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 148 <td align="left"></td>
 149 <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2006, 2011, 2012 Joel de Guzman,
 150       Dan Marsden, Tobias Schwinger<p>
 151         Distributed under the Boost Software License, Version 1.0. (See accompanying
 152         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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