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<div class="section" title="Polymorphic Function Object">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.functional.concepts.poly"></a><a class="link" href="poly.html" title="Polymorphic Function Object"> Polymorphic Function
        Object</a>
</h4></div></div></div>
<a name="fusion.functional.concepts.poly.description"></a><h6>
<a name="id820948"></a>
          <a class="link" href="poly.html#fusion.functional.concepts.poly.description">Description</a>
        </h6>
<p>
          A non-member-pointer <a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred
          Callable Object</a> type.
        </p>
<a name="fusion.functional.concepts.poly.refinement_of"></a><h6>
<a name="id820970"></a>
          <a class="link" href="poly.html#fusion.functional.concepts.poly.refinement_of">Refinement
          of</a>
        </h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><a class="link" href="reg_callable.html" title="Regular Callable Object">Regular Callable
            Object</a></li>
<li class="listitem"><a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred Callable
            Object</a></li>
</ul></div>
<div class="variablelist" title="Notation">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
<dd><p>
              A possibly const-qualified Polymorphic Function Object type
            </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
<dd><p>
              An object or reference to an object of type F
            </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">A1</span>
          <span class="special">...</span><span class="identifier">AN</span></code></span></dt>
<dd><p>
              Argument types
            </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">a1</span>
          <span class="special">...</span><span class="identifier">aN</span></code></span></dt>
<dd><p>
              Objects or references to objects with types <code class="computeroutput"><span class="identifier">A1</span>
              <span class="special">...</span><span class="identifier">AN</span></code>
            </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">T1</span>
          <span class="special">...</span><span class="identifier">TN</span></code></span></dt>
<dd><p>
              <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>
              if <code class="computeroutput"><span class="identifier">a</span></code>i is an LValue,
              same as <code class="computeroutput"><span class="identifier">A</span></code>i, otherwise
            </p></dd>
</dl>
</div>
<a name="fusion.functional.concepts.poly.expression_requirements"></a><h6>
<a name="id821178"></a>
          <a class="link" href="poly.html#fusion.functional.concepts.poly.expression_requirements">Expression
          requirements</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Expression
                </p>
                </th>
<th>
                <p>
                  Return Type
                </p>
                </th>
<th>
                <p>
                  Runtime Complexity
                </p>
                </th>
</tr></thead>
<tbody><tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">a1</span><span class="special">,</span>
                  <span class="special">...</span><span class="identifier">aN</span><span class="special">)</span></code>
                </p>
                </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">result_of</span><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="special">...</span><span class="identifier">TN</span><span class="special">)</span> <span class="special">&gt;::</span><span class="identifier">type</span></code>
                </p>
                </td>
<td>
                <p>
                  Unspecified
                </p>
                </td>
</tr></tbody>
</table></div>
<a name="fusion.functional.concepts.poly.models"></a><h6>
<a name="id821331"></a>
          <a class="link" href="poly.html#fusion.functional.concepts.poly.models">Models</a>
        </h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
            function pointers
          </li>
<li class="listitem">
            function objects of the Standard Library
          </li>
<li class="listitem">
            all Fusion <a class="link" href="../adapters.html" title="Adapters">functional adapters</a>
</li>
</ul></div>
<a name="fusion.functional.concepts.poly.examples"></a><h6>
<a name="id821363"></a>
          <a class="link" href="poly.html#fusion.functional.concepts.poly.examples">Examples</a>
        </h6>
<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="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 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>
</pre>
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