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299 lines
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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_generic"></a><a href="unfused_generic.html" title="unfused_generic">unfused_generic</a></h4></div></div></div>
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<a name="fusion.functional.adapters.unfused_generic.description"></a><h5>
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<a name="id666486"></a>
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<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.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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Non-const LValue arguments are transported as references to non-const,
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otherwise references to const are used.
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</p>
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<div class="sidebar"><p>
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<span class="inlinemediaobject"><img src="../../../images/tip.png" alt="tip"></span> Detecting mutable LValues on a per-argument basis
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is currently a compile time expensive operation (see <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1385.htm" target="_top">The
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Forwarding Problem</a> for details). Therefore, there are two, lightweight
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and more restricted variants of this class template, <a href="unfused_lvalue_args.html" title="unfused_lvalue_args"><tt class="computeroutput"><span class="identifier">unfused_lvalue_args</span></tt></a> and <a href="unfused_rvalue_args.html" title="unfused_rvalue_args"><tt class="computeroutput"><span class="identifier">unfused_rvalue_args</span></tt></a>.
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</p></div>
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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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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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<p>
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/functional/adapter/unfused_generic.hpp>
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</p>
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<a name="fusion.functional.adapters.unfused_generic.synopsis"></a><h5>
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<a name="id666643"></a>
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<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.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">unfused_generic</span><span class="special">;</span>
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</pre>
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<a name="fusion.functional.adapters.unfused_generic.template_parameters"></a><h5>
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<a name="id666724"></a>
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<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.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><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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An 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></tbody>
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</table></div>
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<a name="fusion.functional.adapters.unfused_generic.model_of"></a><h5>
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<a name="id666840"></a>
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<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.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">F</span></tt></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"><tt class="computeroutput"><span class="identifier">f</span></tt></span></dt>
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<dd><p>
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An object convertible to <tt class="computeroutput"><span class="identifier">F</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">UG</span></tt></span></dt>
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<dd><p>
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The type <tt class="computeroutput"><span class="identifier">unfused_generic</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">ug</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">UG</span></tt>,
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initialized with <tt class="computeroutput"><span class="identifier">f</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">a0</span></tt>...<tt class="computeroutput"><span class="identifier">aN</span></tt></span></dt>
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<dd><p>
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Arguments to <tt class="computeroutput"><span class="identifier">ug</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.unfused_generic.expression_semantics"></a><h5>
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<a name="id667108"></a>
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<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.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">UG</span><span class="special">(</span><span class="identifier">f</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">f</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">UG</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">F</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">ug</span><span class="special">(</span><span class="identifier">a0</span></tt>...<tt class="computeroutput"><span class="identifier">aN</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">f</span></tt> with a
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<a href="../../sequence.html" title="Sequence">Sequence</a> that contains references
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to the arguments <tt class="computeroutput"><span class="identifier">a0</span></tt>...<tt class="computeroutput"><span class="identifier">aN</span></tt>.
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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_generic.example"></a><h5>
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<a name="id667374"></a>
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<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.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">typename</span> <span class="identifier">Function</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">class</span> <span class="identifier">fused_bound_1st</span>
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<span class="special">{</span>
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<span class="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">deduce</span><span class="special"><</span><span class="identifier">Function</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">fnc_deferred</span><span class="special">;</span>
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<span class="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">deduce</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">xxx_bound</span><span class="special">;</span>
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<span class="keyword">public</span><span class="special">:</span>
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<span class="identifier">fused_bound_1st</span><span class="special">(</span><span class="identifier">Function</span> <span class="identifier">deferred</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">bound</span><span class="special">)</span>
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<span class="special">:</span> <span class="identifier">fnc_deferred</span><span class="special">(</span><span class="identifier">deferred</span><span class="special">),</span> <span class="identifier">xxx_bound</span><span class="special">(</span><span class="identifier">bound</span><span class="special">)</span>
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<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">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">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><span class="special"><</span> <span class="identifier">Self</span><span class="special">(</span><span class="identifier">Seq</span><span class="special">)</span> <span class="special">></span>
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<span class="special">:</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke</span><span class="special"><</span> <span class="identifier">Function</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">push_front</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">>::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="special">></span>
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<span class="special">{</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">Seq</span><span class="special">></span>
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<span class="keyword">typename</span> <span class="identifier">result</span><span class="special"><</span> <span class="keyword">void</span><span class="special">(</span><span class="identifier">Seq</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">type</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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<span class="keyword">return</span> <span class="identifier">invoke</span><span class="special">(</span><span class="identifier">fnc_deferred</span><span class="special">,</span> <span class="identifier">push_front</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">xxx_bound</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">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Function</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">unfused_generic</span><span class="special"><</span> <span class="identifier">fused_bound_1st</span><span class="special"><</span><span class="identifier">Function</span><span class="special">,</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span>
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<span class="identifier">bind_1st</span><span class="special">(</span><span class="identifier">Function</span> <span class="identifier">f</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">x</span><span class="special">)</span>
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<span class="special">{</span>
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<span class="keyword">return</span> <span class="identifier">unfused_generic</span><span class="special"><</span> <span class="identifier">fused_bound_1st</span><span class="special"><</span><span class="identifier">Function</span><span class="special">,</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span>
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<span class="identifier">fused_bound_1st</span><span class="special"><</span><span class="identifier">Function</span><span class="special">,</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">f</span><span class="special">,</span><span class="identifier">x</span><span class="special">)</span> <span class="special">);</span>
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<span class="special">}</span>
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<span class="keyword">int</span> <span class="identifier">test_func</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">a</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">b</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">c</span><span class="special">)</span>
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||
<span class="special">{</span>
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||
<span class="keyword">return</span> <span class="identifier">a</span><span class="special">+</span><span class="identifier">b</span><span class="special">+</span><span class="identifier">c</span><span class="special">;</span>
|
||
<span class="special">}</span>
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||
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<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span>
|
||
<span class="special">{</span>
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||
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">bind_1st</span><span class="special">(&</span> <span class="identifier">test_func</span><span class="special">,</span><span class="number">3</span><span class="special">)(-</span><span class="number">2</span><span class="special">,-</span><span class="number">1</span><span class="special">)</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
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<span class="identifier">assert</span><span class="special">(</span><span class="identifier">bind_1st</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">plus</span><span class="special"><</span><span class="keyword">float</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="special">==</span> <span class="number">1.5f</span><span class="special">);</span>
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||
<span class="special">}</span>
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||
</pre>
|
||
<a name="fusion.functional.adapters.unfused_generic.see_also"></a><h5>
|
||
<a name="id668770"></a>
|
||
<a href="unfused_generic.html#fusion.functional.adapters.unfused_generic.see_also">See
|
||
also</a>
|
||
</h5>
|
||
<div class="itemizedlist"><ul type="disc">
|
||
<li><a href="unfused_lvalue_args.html" title="unfused_lvalue_args"><tt class="computeroutput"><span class="identifier">unfused_lvalue_args</span></tt></a></li>
|
||
<li><a href="unfused_rvalue_args.html" title="unfused_rvalue_args"><tt class="computeroutput"><span class="identifier">unfused_rvalue_args</span></tt></a></li>
|
||
<li><a href="unfused_typed.html" title="unfused_typed"><tt class="computeroutput"><span class="identifier">unfused_typed</span></tt></a></li>
|
||
<li><a href="../../support/deduce.html" title="deduce"><tt class="computeroutput"><span class="identifier">deduce</span></tt></a></li>
|
||
<li><a href="../../support/deduce_sequence.html" title="deduce_sequence"><tt class="computeroutput"><span class="identifier">deduce_sequence</span></tt></a></li>
|
||
</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
|
||
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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</div></td>
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</tr></table>
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