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<div class="section" lang="en">
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<div class="titlepage">
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<div><div><h3 class="title">
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<a name="fusion.view.transform_view"></a><a href="transform_view.html" title="transform_view">transform_view</a>
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</h3></div></div>
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<div></div>
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</div>
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<p>
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The unary version of <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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presents a view of its underlying sequence given a unary function object
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or function pointer. The binary version of <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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presents a view of 2 underlying sequences, given a binary function object
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or function pointer. The <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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inherits the traversal characteristics (see <a href="../sequence/concepts.html#fusion.sequence.concepts.traversal">Sequence
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Traversal Concept</a>) of its underlying sequence or sequences.
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</p>
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<a name="fusion.view.transform_view.header"></a><h4>
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<a name="id524861"></a>
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<a href="transform_view.html#fusion.view.transform_view.header">Header</a>
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</h4>
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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">view</span><span class="special">/</span><span class="identifier">transform_view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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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">include</span><span class="special">/</span><span class="identifier">transform_view</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.view.transform_view.synopsis"></a><h4>
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<a name="id525017"></a>
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<a href="transform_view.html#fusion.view.transform_view.synopsis">Synopsis</a>
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</h4>
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<p>
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<span class="bold"><b>Unary Version</b></span>
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</p>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">F1</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">transform_view</span><span class="special">;</span>
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</pre>
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<p>
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<span class="bold"><b>Binary Version</b></span>
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</p>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sequence1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence2</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">F2</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">transform_view</span><span class="special">;</span>
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</pre>
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<a name="fusion.view.transform_view.template_parameters"></a><h4>
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<a name="id525221"></a>
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<a href="transform_view.html#fusion.view.transform_view.template_parameters">Template parameters</a>
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</h4>
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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><p>
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Parameter
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</p></th>
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<th><p>
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Description
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</p></th>
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<th><p>
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Default
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</p></th>
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</tr></thead>
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<tbody>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">Sequence</span></tt>
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</p></td>
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<td><p>
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A <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</p></td>
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<td><p>
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">Sequence1</span></tt>
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</p></td>
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<td><p>
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A <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</p></td>
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<td><p>
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">Sequence2</span></tt>
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</p></td>
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<td><p>
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A <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</p></td>
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<td><p>
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">F1</span></tt>
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</p></td>
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<td><p>
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A unary function object or function pointer. <tt class="computeroutput"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></tt></a><span class="special"><</span><span class="identifier">F1</span><span class="special">(</span><span class="identifier">E</span><span class="special">)>::</span><span class="identifier">type</span></tt> is the return type of an instance
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of <tt class="computeroutput"><span class="identifier">F1</span></tt> when called
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with a value of each element type <tt class="computeroutput"><span class="identifier">E</span></tt>
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in the input sequence.
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</p></td>
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<td><p>
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">F2</span></tt>
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</p></td>
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<td><p>
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A binary function object or function pointer. <tt class="computeroutput"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></tt></a><span class="special"><</span><span class="identifier">F2</span><span class="special">(</span><span class="identifier">E1</span><span class="special">,</span> <span class="identifier">E2</span><span class="special">)>::</span><span class="identifier">type</span></tt> is the return type of an instance
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of <tt class="computeroutput"><span class="identifier">F2</span></tt> when called
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with a value of each corresponding pair of element type <tt class="computeroutput"><span class="identifier">E1</span></tt> and <tt class="computeroutput"><span class="identifier">E2</span></tt>
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in the input sequences.
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</p></td>
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<td><p>
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</p></td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.view.transform_view.model_of"></a><h4>
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<a name="id525686"></a>
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<a href="transform_view.html#fusion.view.transform_view.model_of">Model of</a>
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</h4>
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<div class="itemizedlist"><ul type="disc"><li>
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<a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward Sequence</a>,
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<a href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional
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Sequence">Bidirectional
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Sequence</a> or <a href="../sequence/concepts/random_access_sequence.html" title="Random
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Access Sequence">Random
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Access Sequence</a> depending on the traversal characteristics (see
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<a href="../sequence/concepts.html#fusion.sequence.concepts.traversal">Sequence Traversal Concept</a>)
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of its underlying sequence.
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</li></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">TV</span></tt></span></dt>
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<dd><p>
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A <tt class="computeroutput"><span class="identifier">transform_view</span></tt> type
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">BTV</span></tt></span></dt>
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<dd><p>
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A binary <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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type
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">UTV</span></tt></span></dt>
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<dd><p>
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A unary <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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type
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">f1</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">F1</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">f2</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">F2</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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An instance of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">s1</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">Sequence1</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">s2</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">Sequence2</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tv</span></tt>,
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<tt class="computeroutput"><span class="identifier">tv2</span></tt></span></dt>
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<dd><p>
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Instances of <tt class="computeroutput"><span class="identifier">transform_view</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.view.transform_view.expression_semantics"></a><h4>
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<a name="id526088"></a>
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<a href="transform_view.html#fusion.view.transform_view.expression_semantics">Expression
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Semantics</a>
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</h4>
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<p>
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Semantics of an expression is defined only where it differs from, or is not
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defined in <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <a href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional
|
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Sequence">Bidirectional
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Sequence</a> or <a href="../sequence/concepts/random_access_sequence.html" title="Random
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Access Sequence">Random
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Access Sequence</a> depending on the traversal characteristics (see <a href="../sequence/concepts.html#fusion.sequence.concepts.traversal">Sequence Traversal Concept</a>)
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of its underlying sequence or sequences.
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</p>
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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><p>
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Expression
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</p></th>
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<th><p>
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Semantics
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</p></th>
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</tr></thead>
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<tbody>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">UTV</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">f1</span><span class="special">)</span></tt>
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</p></td>
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<td><p>
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Creates a unary <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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given sequence, <tt class="computeroutput"><span class="identifier">s</span></tt>
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and unary function object or function pointer, <tt class="computeroutput"><span class="identifier">f1</span></tt>.
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">BTV</span><span class="special">(</span><span class="identifier">s1</span><span class="special">,</span> <span class="identifier">s2</span><span class="special">,</span> <span class="identifier">f2</span><span class="special">)</span></tt>
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</p></td>
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<td><p>
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Creates a binary <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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given sequences, <tt class="computeroutput"><span class="identifier">s1</span></tt>
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and <tt class="computeroutput"><span class="identifier">s2</span></tt> and binary
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function object or function pointer, <tt class="computeroutput"><span class="identifier">f2</span></tt>.
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">TV</span><span class="special">(</span><span class="identifier">tv</span><span class="special">)</span></tt>
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</p></td>
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<td><p>
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Copy constructs a <tt class="computeroutput"><span class="identifier">transform_view</span></tt>
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from another <tt class="computeroutput"><span class="identifier">transform_view</span></tt>,
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<tt class="computeroutput"><span class="identifier">tv</span></tt>.
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">tv</span> <span class="special">=</span>
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<span class="identifier">tv2</span></tt>
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</p></td>
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<td><p>
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Assigns to a <tt class="computeroutput"><span class="identifier">transform_view</span></tt>,
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<tt class="computeroutput"><span class="identifier">tv</span></tt>, from another
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<tt class="computeroutput"><span class="identifier">transform_view</span></tt>,
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<tt class="computeroutput"><span class="identifier">tv2</span></tt>.
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</p></td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.view.transform_view.example"></a><h4>
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<a name="id526566"></a>
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<a href="transform_view.html#fusion.view.transform_view.example">Example</a>
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</h4>
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<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">square</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">typename</span> <span class="identifier">U</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">square</span><span class="special">(</span><span class="identifier">U</span><span class="special">)></span>
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<span class="special">:</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">U</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">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">x</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">x</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="special">};</span>
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<span class="keyword">typedef</span> <a href="../container/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">short</span><span class="special">,</span> <span class="keyword">double</span><span class="special">></span> <span class="identifier">vector_type</span><span class="special">;</span>
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<span class="identifier">vector_type</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="number">5</span><span class="special">,</span> <span class="number">3.3</span><span class="special">);</span>
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<span class="identifier">transform_view</span><span class="special"><</span><span class="identifier">vector_type</span><span class="special">,</span> <span class="identifier">square</span><span class="special">></span> <span class="identifier">transform</span><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">square</span><span class="special">());</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">transform</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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</pre>
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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>
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||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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</div></td>
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</tr></table>
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<hr>
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