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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>fused_function_object</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.functional.adapters.fused_function_object"></a><a class="link" href="fused_function_object.html" title="fused_function_object">fused_function_object</a>
</h4></div></div></div>
<a name="fusion.functional.adapters.fused_function_object.description"></a><h6>
<a name="id1044269"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.description">Description</a>
</h6>
<p>
An unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function
Object</a> adapter template for a <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic
Function Object</a> target function. It takes a <a class="link" href="../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
Sequence</a> that contains the arguments for the target function.
</p>
<p>
The type of the target function is allowed to be const qualified or a reference.
Const qualification is preserved and propagated appropriately (in other
words, only const versions of <code class="literal">operator()</code> can be used
for an target function object that is const or, if the target function
object is held by value, the adapter is const).
</p>
<a name="fusion.functional.adapters.fused_function_object.header"></a><h6>
<a name="id1044312"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.header">Header</a>
</h6>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">adapter</span><span class="special">/</span><span class="identifier">fused_function_object</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.functional.adapters.fused_function_object.synopsis"></a><h6>
<a name="id1044384"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.synopsis">Synopsis</a>
</h6>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Function</span><span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">fused_function_object</span><span class="special">;</span>
</pre>
<a name="fusion.functional.adapters.fused_function_object.template_parameters"></a><h6>
<a name="id1044438"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.template_parameters">Template
parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Description
</p>
</th>
<th>
<p>
Default
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">Function</span></code>
</p>
</td>
<td>
<p>
<a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function
Object</a> type
</p>
</td>
<td>
</td>
</tr></tbody>
</table></div>
<a name="fusion.functional.adapters.fused_function_object.model_of"></a><h6>
<a name="id1044529"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.model_of">Model
of</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function
Object</a>
</li>
<li class="listitem">
<a class="link" href="../concepts/def_callable.html" title="Deferred Callable Object">Deferred Callable
Object</a>
</li>
</ul></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><code class="computeroutput"><span class="identifier">R</span></code></span></dt>
<dd><p>
A possibly const qualified <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic
Function Object</a> type or reference type thereof
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">r</span></code></span></dt>
<dd><p>
An object convertible to <code class="computeroutput"><span class="identifier">R</span></code>
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt>
<dd><p>
A <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> of arguments that
are accepted by <code class="computeroutput"><span class="identifier">r</span></code>
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
<dd><p>
An instance of <code class="computeroutput"><span class="identifier">fused</span><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;</span></code>
</p></dd>
</dl>
</div>
<a name="fusion.functional.adapters.fused_function_object.expression_semantics"></a><h6>
<a name="id1044698"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.expression_semantics">Expression
Semantics</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">fused_function_object</span><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;(</span><span class="identifier">r</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
Creates a fused function as described above, initializes the
target function with <code class="computeroutput"><span class="identifier">r</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">fused_function_object</span><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;()</span></code>
</p>
</td>
<td>
<p>
Creates a fused function as described above, attempts to use
<code class="computeroutput"><span class="identifier">R</span></code>'s default constructor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
Calls <code class="computeroutput"><span class="identifier">r</span></code> with
the elements in <code class="computeroutput"><span class="identifier">s</span></code>
as its arguments.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.functional.adapters.fused_function_object.example"></a><h6>
<a name="id1045031"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.example">Example</a>
</h6>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">SeqOfSeqs</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Func</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a class="link" href="../../algorithm/transformation/metafunctions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></code></a><span class="special">&lt;</span> <span class="identifier">zip_view</span><span class="special">&lt;</span><span class="identifier">SeqOfSeqs</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">,</span>
<span class="identifier">fused_function_object</span><span class="special">&lt;</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&amp;&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">n_ary_transform</span><span class="special">(</span><span class="identifier">SeqOfSeqs</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">f</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <a class="link" href="../../algorithm/transformation/functions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">transform</span></code></a><span class="special">(</span><span class="identifier">zip_view</span><span class="special">&lt;</span><span class="identifier">SeqOfSeqs</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">),</span>
<span class="identifier">fused_function_object</span><span class="special">&lt;</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&amp;&gt;(</span><span class="identifier">f</span><span class="special">));</span>
<span class="special">}</span>
<span class="keyword">struct</span> <span class="identifier">sub</span>
<span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Self</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">result</span><span class="special">&lt;</span> <span class="identifier">Self</span><span class="special">(</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">T</span><span class="special">)</span> <span class="special">&gt;</span>
<span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">T</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">lhs</span> <span class="special">-</span> <span class="identifier">rhs</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span>
<span class="special">{</span>
<a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">a</span><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">2.0f</span><span class="special">);</span>
<a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">b</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">1.5f</span><span class="special">);</span>
<a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">c</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">0.5f</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">c</span> <span class="special">==</span> <span class="identifier">n_ary_transform</span><span class="special">(</span><a class="link" href="../../container/generation/functions/vector_tie.html" title="vector_tie"><code class="computeroutput"><span class="identifier">vector_tie</span></code></a><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">),</span> <span class="identifier">sub</span><span class="special">()));</span>
<span class="special">}</span>
</pre>
<a name="fusion.functional.adapters.fused_function_object.see_also"></a><h6>
<a name="id1045803"></a>
<a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.see_also">See
also</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="fused.html" title="fused"><code class="computeroutput"><span class="identifier">fused</span></code></a>
</li>
<li class="listitem">
<a class="link" href="fused_procedure.html" title="fused_procedure"><code class="computeroutput"><span class="identifier">fused_procedure</span></code></a>
</li>
<li class="listitem">
<a class="link" href="../invocation/functions/invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">invoke_function_object</span></code></a>
</li>
<li class="listitem">
<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>
</li>
<li class="listitem">
<a class="link" href="../../support/deduce.html" title="deduce"><code class="computeroutput"><span class="identifier">deduce</span></code></a>
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
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>)
</p>
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