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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.functional.concepts.def_callable"></a><a href="def_callable.html" title=" Deferred
        Callable Object"> Deferred
        Callable Object</a></h4></div></div></div>
<a name="fusion.functional.concepts.def_callable.description"></a><h5>
<a name="id652988"></a>
          <a href="def_callable.html#fusion.functional.concepts.def_callable.description">Description</a>
        </h5>
<p>
          <a href="callable.html" title=" Callable Object">Callable Object</a>
          types that work with <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a>
          to determine the result of a call.
        </p>
<a name="fusion.functional.concepts.def_callable.refinement_of"></a><h5>
<a name="id653035"></a>
          <a href="def_callable.html#fusion.functional.concepts.def_callable.refinement_of">Refinement
          of</a>
        </h5>
<div class="itemizedlist"><ul type="disc"><li><a href="callable.html" title=" Callable Object">Callable Object</a></li></ul></div>
<div class="sidebar"><p>
          note Once C++ supports the <tt class="literal">decltype</tt> keyword, all models
          of <a href="callable.html" title=" Callable Object">Callable Object</a>
          will also be models of <a href="def_callable.html" title=" Deferred
        Callable Object">Deferred
          Callable Object</a>, because function objects won't need client-side
          support for <tt class="computeroutput"><span class="identifier">result_of</span></tt>.
        </p></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">F</span></tt></span></dt>
<dd><p>
              A possibly const qualified Deferred Callable Object type
            </p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">A1</span>
          <span class="special">...</span><span class="identifier">AN</span></tt></span></dt>
<dd><p>
              Argument types
            </p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">a1</span>
          <span class="special">...</span><span class="identifier">aN</span></tt></span></dt>
<dd><p>
              Objects or references to objects with types <tt class="computeroutput"><span class="identifier">A1</span>
              <span class="special">...</span><span class="identifier">AN</span></tt>
            </p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">T1</span>
          <span class="special">...</span><span class="identifier">TN</span></tt></span></dt>
<dd><p>
              <tt class="computeroutput"><span class="identifier">T</span></tt>i is <tt class="computeroutput"><span class="identifier">A</span></tt>i <tt class="computeroutput"><span class="special">&amp;</span></tt>
              if <tt class="computeroutput"><span class="identifier">a</span></tt>i is an LValue,
              same as <tt class="computeroutput"><span class="identifier">A</span></tt>i, otherwise
            </p></dd>
</dl>
</div>
<a name="fusion.functional.concepts.def_callable.expression_requirements"></a><h5>
<a name="id653342"></a>
          <a href="def_callable.html#fusion.functional.concepts.def_callable.expression_requirements">Expression
          requirements</a>
        </h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Expression
                </p>
                </th>
<th>
                <p>
                  Type
                </p>
                </th>
</tr></thead>
<tbody><tr>
<td>
                <p>
                  <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></tt></a><tt class="computeroutput"><span class="special">&lt;</span> <span class="identifier">F</span><span class="special">(</span><span class="identifier">T1</span>
                  <span class="special">...</span><span class="identifier">TN</span><span class="special">)</span> <span class="special">&gt;::</span><span class="identifier">type</span></tt>
                </p>
                </td>
<td>
                <p>
                  Result of a call with <tt class="computeroutput"><span class="identifier">A1</span>
                  <span class="special">...</span><span class="identifier">AN</span></tt>-typed
                  arguments
                </p>
                </td>
</tr></tbody>
</table></div>
<a name="fusion.functional.concepts.def_callable.models"></a><h5>
<a name="id653525"></a>
          <a href="def_callable.html#fusion.functional.concepts.def_callable.models">Models</a>
        </h5>
<div class="itemizedlist"><ul type="disc">
<li>
<a href="poly.html" title=" Polymorphic Function
        Object">Polymorphic Function
            Object</a> types
          </li>
<li>
            member (function or data) pointer types
          </li>
</ul></div>
<a name="fusion.functional.concepts.def_callable.examples"></a><h5>
<a name="id653571"></a>
          <a href="def_callable.html#fusion.functional.concepts.def_callable.examples">Examples</a>
        </h5>
<pre class="programlisting">
<span class="special">&amp;</span> <span class="identifier">a_free_function</span>
<span class="special">&amp;</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_static_member_function</span>
<span class="special">&amp;</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_nonstatic_data_member</span>
<span class="special">&amp;</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_nonstatic_member_function</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="comment">// using namespace boost;
</span><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>
<span class="comment">// Note: Boost.Lambda expressions don't work with __boost_result_of__
</span><span class="identifier">fusion</span><span class="special">::</span><a href="../generation/functions/mk_fused_fobj.html" title="
          make_fused_function_object"><tt class="computeroutput"><span class="identifier">make_fused_function_object</span></tt></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>
</pre>
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