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Christopher Schmidt cd811f56bc Fusion: merge from trunk 
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2010-12-29 19:54:59 +00:00

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<title>Deferred Callable Object</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.functional.concepts.def_callable"></a><a class="link" 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><h6>
<a name="id1034620"></a>
<a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.description">Description</a>
</h6>
<p>
<a class="link" 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><h6>
<a name="id1034646"></a>
<a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.refinement_of">Refinement
of</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<a class="link" href="callable.html" title="Callable Object">Callable Object</a>
</li></ul></div>
<div class="sidebar">
<p class="title"><b></b></p>
<p>
note Once C++ supports the <code class="literal">decltype</code> keyword, all models
of <a class="link" href="callable.html" title="Callable Object">Callable Object</a>
will also be models of <a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred
Callable Object</a>, because function objects won't need client-side
support for <code class="computeroutput"><span class="identifier">result_of</span></code>.
</p>
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<div class="variablelist">
<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 Deferred Callable Object type
</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>
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<a name="fusion.functional.concepts.def_callable.expression_requirements"></a><h6>
<a name="id1034869"></a>
<a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.expression_requirements">Expression
requirements</a>
</h6>
<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"><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>
<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>
Result of a call with <code class="computeroutput"><span class="identifier">A1</span>
<span class="special">...</span><span class="identifier">AN</span></code>-typed
arguments
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.functional.concepts.def_callable.models"></a><h6>
<a name="id1035009"></a>
<a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.models">Models</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="poly.html" title="Polymorphic Function Object">Polymorphic Function
Object</a> types
</li>
<li class="listitem">
member (function or data) pointer types
</li>
</ul></div>
<a name="fusion.functional.concepts.def_callable.examples"></a><h6>
<a name="id1035045"></a>
<a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.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="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 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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<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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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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