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<div class="section" lang="en">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.functional.adapters.fused_function_object"></a><a href="fused_function_object.html" title="fused_function_object">fused_function_object</a></h4></div></div></div>
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<a name="fusion.functional.adapters.fused_function_object.description"></a><h5>
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<a name="id651278"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.description">Description</a>
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</h5>
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<p>
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An unary <a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic Function
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Object</a> adapter template for a <a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic
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Function Object</a> target function. It takes a <a href="../../sequences/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a> that contains the arguments for the target function.
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</p>
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<p>
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The type of the target function is allowed to be const qualified or a reference.
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Const qualification is preserved and propagated appropriately (in other
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words, only const versions of <tt class="literal">operator()</tt> can be used
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for an target function object that is const or, if the target function
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object is held by value, the adapter is const).
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</p>
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<a name="fusion.functional.adapters.fused_function_object.header"></a><h5>
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<a name="id651355"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.header">Header</a>
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</h5>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</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">></span>
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</pre>
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<a name="fusion.functional.adapters.fused_function_object.synopsis"></a><h5>
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<a name="id651462"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.synopsis">Synopsis</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Function</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">fused_function_object</span><span class="special">;</span>
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</pre>
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<a name="fusion.functional.adapters.fused_function_object.template_parameters"></a><h5>
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<a name="id651545"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.template_parameters">Template
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parameters</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<p>
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Parameter
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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<th>
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<p>
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Default
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">Function</span></tt>
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</p>
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</td>
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<td>
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<p>
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<a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic Function
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Object</a> type
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</p>
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</td>
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<td>
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<p>
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<a name="fusion.functional.adapters.fused_function_object.model_of"></a><h5>
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<a name="id651661"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.model_of">Model
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of</a>
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</h5>
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<div class="itemizedlist"><ul type="disc">
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<li><a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic Function
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Object</a></li>
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<li><a href="../concepts/def_callable.html" title=" Deferred
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Callable Object">Deferred Callable
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Object</a></li>
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</ul></div>
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<div class="variablelist">
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<p class="title"><b>Notation</b></p>
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<dl>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">R</span></tt></span></dt>
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<dd><p>
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A possibly const qualified <a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic
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Function Object</a> type or reference type thereof
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">r</span></tt></span></dt>
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<dd><p>
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An object convertible to <tt class="computeroutput"><span class="identifier">R</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
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<dd><p>
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A <a href="../../sequences.html" title="Sequences">Sequence</a> of arguments that
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are accepted by <tt class="computeroutput"><span class="identifier">r</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">f</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">fused</span><span class="special"><</span><span class="identifier">R</span><span class="special">></span></tt>
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</p></dd>
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</dl>
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</div>
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<a name="fusion.functional.adapters.fused_function_object.expression_semantics"></a><h5>
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<a name="id651881"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.expression_semantics">Expression
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Semantics</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Semantics
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">R</span><span class="special">>(</span><span class="identifier">r</span><span class="special">)</span></tt>
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</p>
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</td>
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<td>
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<p>
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Creates a fused function as described above, initializes the target
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function with <tt class="computeroutput"><span class="identifier">r</span></tt>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">R</span><span class="special">>()</span></tt>
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</p>
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</td>
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<td>
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<p>
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Creates a fused function as described above, attempts to use <tt class="computeroutput"><span class="identifier">R</span></tt>'s default constructor.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
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</p>
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</td>
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<td>
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<p>
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Calls <tt class="computeroutput"><span class="identifier">r</span></tt> with the
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elements in <tt class="computeroutput"><span class="identifier">s</span></tt> as
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its arguments.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.functional.adapters.fused_function_object.example"></a><h5>
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<a name="id652139"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.example">Example</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">template</span><span class="special"><</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">></span>
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<span class="keyword">typename</span> <a href="../../algorithms/transformation/metafunctions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></tt></a><span class="special"><</span> <span class="identifier">zip_view</span><span class="special"><</span><span class="identifier">SeqOfSeqs</span><span class="special">></span> <span class="keyword">const</span><span class="special">,</span>
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<span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&></span> <span class="special">>::</span><span class="identifier">type</span>
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<span class="identifier">n_ary_transform</span><span class="special">(</span><span class="identifier">SeqOfSeqs</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">f</span><span class="special">)</span>
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<span class="special">{</span>
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<span class="keyword">return</span> <a href="../../algorithms/transformation/functions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a><span class="special">(</span><span class="identifier">zip_view</span><span class="special"><</span><span class="identifier">SeqOfSeqs</span><span class="special">>(</span><span class="identifier">s</span><span class="special">),</span>
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<span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&>(</span><span class="identifier">f</span><span class="special">));</span>
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<span class="special">}</span>
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<span class="keyword">struct</span> <span class="identifier">sub</span>
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<span class="special">{</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span>
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<span class="keyword">template</span> <span class="special"><</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">></span>
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<span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</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">></span>
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<span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
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<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>
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<span class="special">{</span>
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<span class="keyword">return</span> <span class="identifier">lhs</span> <span class="special">-</span> <span class="identifier">rhs</span><span class="special">;</span>
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<span class="special">}</span>
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<span class="special">};</span>
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<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span>
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<span class="special">{</span>
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<a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></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>
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<a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></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>
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<a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></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>
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<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 href="../../sequences/generation/functions/vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></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>
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<span class="special">}</span>
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||
</pre>
|
||
<a name="fusion.functional.adapters.fused_function_object.see_also"></a><h5>
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<a name="id653198"></a>
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<a href="fused_function_object.html#fusion.functional.adapters.fused_function_object.see_also">See
|
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also</a>
|
||
</h5>
|
||
<div class="itemizedlist"><ul type="disc">
|
||
<li><a href="fused.html" title="fused"><tt class="computeroutput"><span class="identifier">fused</span></tt></a></li>
|
||
<li><a href="fused_procedure.html" title="fused_procedure"><tt class="computeroutput"><span class="identifier">fused_procedure</span></tt></a></li>
|
||
<li><a href="../invocation/functions/invoke_fobj.html" title="
|
||
invoke_function_object"><tt class="computeroutput"><span class="identifier">invoke_function_object</span></tt></a></li>
|
||
<li><a href="../../support/deduce.html" title="deduce"><tt class="computeroutput"><span class="identifier">deduce</span></tt></a></li>
|
||
</ul></div>
|
||
</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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||
<td align="right"><small>Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
|
||
Schwinger</small></td>
|
||
</tr></table>
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<hr>
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<div class="spirit-nav">
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