forked from boostorg/fusion
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296 lines
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<link rel="start" href="../../../index.html" title="Chapter 1. Fusion 2.0">
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<table cellpadding="2" width="100%"><tr>
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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.unfused"></a><a href="unfused.html" title="unfused">unfused</a></h4></div></div></div>
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<a name="fusion.functional.adapters.unfused.description"></a><h5>
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<a name="id1312214"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.description">Description</a>
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</h5>
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<p>
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An n-ary <a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic Function
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Object</a> adapter template for an unary <a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic
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Function Object</a> target function. When called, its arguments are
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bundled to a <a href="../../sequence/concepts/random_access_sequence.html" title="Random
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Access Sequence">Random
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Access Sequence</a> of references that is passed to the target function
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object.
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</p>
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<p>
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The nullary overload of the call operator can be removed by setting the
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second template parameter to <code class="computeroutput"><span class="keyword">false</span></code>,
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which is very useful if the result type computation would result in a compile
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error, otherwise (nullary call operator's prototypes can't be templates
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and thus are instantiated as early as the class template).
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</p>
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<p>
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Only LValue arguments are accepted. To overcome this limitation, apply
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<a href="http://www.boost.org/libs/functional/forward/doc/html/index.html" target="_top">Boost.Functional/Forward</a>.
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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 <code class="literal">operator()</code> can be used
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if the target function object is const - or, in case 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.unfused.header"></a><h5>
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<a name="id1312314"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.header">Header</a>
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</h5>
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<pre class="programlisting"><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">unfused</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.unfused.synopsis"></a><h5>
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<a name="id1312406"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.synopsis">Synopsis</a>
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</h5>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Function</span><span class="special">,</span> <span class="keyword">bool</span> <span class="identifier">AllowNullary</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">unfused</span><span class="special">;</span>
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</pre>
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<a name="fusion.functional.adapters.unfused.template_parameters"></a><h5>
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<a name="id1312501"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.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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<th>
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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>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">Function</span></code>
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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 unary <a href="../concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic
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Function Object</a>
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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>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">AllowNullary</span></code>
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</p>
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</td>
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<td>
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<p>
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Boolean constant
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</p>
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</td>
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<td>
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<p>
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true
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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.unfused.model_of"></a><h5>
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<a name="id1312635"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.model_of">Model 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"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
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<dd><p>
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A possibly const qualified, unary <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"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
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<dd><p>
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An object convertible to <code class="computeroutput"><span class="identifier">F</span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">UL</span></code></span></dt>
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<dd><p>
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The type <code class="computeroutput"><span class="identifier">unfused</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">ul</span></code></span></dt>
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<dd><p>
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An instance of <code class="computeroutput"><span class="identifier">UL</span></code>,
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initialized with <code class="computeroutput"><span class="identifier">f</span></code>
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt>
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<dd><p>
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Arguments to <code class="computeroutput"><span class="identifier">ul</span></code>
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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.unfused.expression_semantics"></a><h5>
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<a name="id1312873"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.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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<code class="computeroutput"><span class="identifier">UL</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
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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 <code class="computeroutput"><span class="identifier">f</span></code>.
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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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<code class="computeroutput"><span class="identifier">UL</span><span class="special">()</span></code>
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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 <code class="computeroutput"><span class="identifier">F</span></code>'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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<code class="computeroutput"><span class="identifier">ul</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code>
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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 <code class="computeroutput"><span class="identifier">f</span></code> with a
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<a href="../../sequence.html" title="Sequence">Sequence</a> that contains references
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to the arguments <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>.
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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.unfused.example"></a><h5>
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<a name="id1313108"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.example">Example</a>
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</h5>
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<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">fused_incrementer</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">class</span> <span class="identifier">Seq</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">result</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">type</span><span class="special">;</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">class</span> <span class="identifier">Seq</span><span class="special">></span>
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<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Seq</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span>
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<span class="special">{</span>
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<a href="../../algorithm/iteration/functions/for_each.html" title="for_each"><code class="computeroutput"><span class="identifier">for_each</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,++</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">lambda</span><span class="special">::</span><span class="identifier">_1</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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<span class="identifier">unfused</span><span class="special"><</span><span class="identifier">fused_incrementer</span><span class="special">></span> <span class="identifier">increment</span><span class="special">;</span>
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<span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">b</span> <span class="special">=</span> <span class="char">'X'</span><span class="special">;</span>
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<span class="identifier">increment</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">);</span>
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<span class="identifier">assert</span><span class="special">(</span><span class="identifier">a</span> <span class="special">==</span> <span class="number">3</span> <span class="special">&&</span> <span class="identifier">b</span> <span class="special">==</span> <span class="char">'Y'</span><span class="special">);</span>
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<span class="special">}</span>
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</pre>
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<a name="fusion.functional.adapters.unfused.see_also"></a><h5>
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<a name="id1313547"></a>
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<a href="unfused.html#fusion.functional.adapters.unfused.see_also">See also</a>
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</h5>
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<div class="itemizedlist"><ul type="disc">
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<li><a href="unfused_typed.html" title="unfused_typed"><code class="computeroutput"><span class="identifier">unfused_typed</span></code></a></li>
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<li><a href="../generation/functions/mk_unfused.html" title="
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make_unfused"><code class="computeroutput"><span class="identifier">make_unfused</span></code></a></li>
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</ul></div>
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</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"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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