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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.sequences.views.transform_view"></a><a href="transform_view.html" title="transform_view">transform_view</a></h4></div></div></div>
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<p>
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<code class="computeroutput"><span class="identifier">transform_view</span></code> presents
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a transformed view of its underlying sequence given a unary <a href="../../functional/concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic
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Function Object</a>. The <code class="computeroutput"><span class="identifier">transform_view</span></code>
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inherits the traversal characteristics (see <a href="../concepts.html#fusion.sequences.concepts.traversal">Sequence
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Traversal Concept</a>) of its underlying sequence.
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</p>
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<a name="fusion.sequences.views.transform_view.header"></a><h5>
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<a name="id997916"></a>
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<a href="transform_view.html#fusion.sequences.views.transform_view.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">sequence</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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</pre>
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<a name="fusion.sequences.views.transform_view.synopsis"></a><h5>
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<a name="id998008"></a>
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<a href="transform_view.html#fusion.sequences.views.transform_view.synopsis">Synopsis</a>
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</h5>
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<p>
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<span class="bold"><strong>Unary Version</strong></span>
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</p>
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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">Sequence</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">F</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"><strong>Binary Version</strong></span>
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</p>
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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">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">F</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.sequences.views.transform_view.template_parameters"></a><h5>
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<a name="id998187"></a>
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<a href="transform_view.html#fusion.sequences.views.transform_view.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>Parameter</th>
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<th>Description</th>
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<th>Default</th>
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</tr></thead>
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<tbody>
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<tr>
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<td><code class="computeroutput"><span class="identifier">Sequence</span></code></td>
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<td>A
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<a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</td>
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<td> </td>
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</tr>
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<tr>
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<td><code class="computeroutput"><span class="identifier">Sequence1</span></code></td>
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<td>A
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<a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</td>
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<td> </td>
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</tr>
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<tr>
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<td><code class="computeroutput"><span class="identifier">Sequence2</span></code></td>
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<td>A
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<a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</td>
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<td> </td>
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</tr>
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<tr>
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<td><code class="computeroutput"><span class="identifier">F</span></code></td>
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<td>A
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<a href="../../functional/concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic Function
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Object</a>
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</td>
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<td> </td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.sequences.views.transform_view.model_of"></a><h5>
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<a name="id998334"></a>
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<a href="transform_view.html#fusion.sequences.views.transform_view.model_of">Model of</a>
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</h5>
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<div class="itemizedlist"><ul type="disc"><li>
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<a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward Sequence</a>,
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<a href="../concepts/bidirectional_sequence.html" title="Bidirectional
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Sequence">Bidirectional
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Sequence</a> or <a href="../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="../concepts.html#fusion.sequences.concepts.traversal">Sequence Traversal
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Concept</a>) 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"><code class="computeroutput"><span class="identifier">TV</span></code></span></dt>
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<dd>
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A <code class="computeroutput"><span class="identifier">transform_view</span></code> type
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</dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">BTV</span></code></span></dt>
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<dd>
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A binary <code class="computeroutput"><span class="identifier">transform_view</span></code>
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type
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</dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">UTV</span></code></span></dt>
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<dd>
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A unary <code class="computeroutput"><span class="identifier">transform_view</span></code>
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type
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</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>
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An instance of <code class="computeroutput"><span class="identifier">F</span></code>
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</dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt>
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<dd>
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An instance of <code class="computeroutput"><span class="identifier">Sequence</span></code>
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</dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">s1</span></code></span></dt>
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<dd>
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An instance of <code class="computeroutput"><span class="identifier">Sequence1</span></code>
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</dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">s2</span></code></span></dt>
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<dd>
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An instance of <code class="computeroutput"><span class="identifier">Sequence2</span></code>
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</dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">tv</span></code>,
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<code class="computeroutput"><span class="identifier">tv2</span></code></span></dt>
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<dd>
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Instances of <code class="computeroutput"><span class="identifier">transform_view</span></code>
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</dd>
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</dl>
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</div>
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<a name="fusion.sequences.views.transform_view.expression_semantics"></a><h5>
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<a name="id998610"></a>
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<a href="transform_view.html#fusion.sequences.views.transform_view.expression_semantics">Expression
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Semantics</a>
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</h5>
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<p>
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Semantics of an expression is defined only where it differs from, or is
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not defined in <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <a href="../concepts/bidirectional_sequence.html" title="Bidirectional
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Sequence">Bidirectional
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Sequence</a> or <a href="../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="../concepts.html#fusion.sequences.concepts.traversal">Sequence Traversal
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Concept</a>) of its underlying sequence.
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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>Expression</th>
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<th>Semantics</th>
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</tr></thead>
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<tbody>
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<tr>
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<td><code class="computeroutput"><span class="identifier">UTV</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">f</span><span class="special">)</span></code></td>
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<td>Creates
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a unary <code class="computeroutput"><span class="identifier">transform_view</span></code>
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given sequence, <code class="computeroutput"><span class="identifier">s</span></code>
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and unary <a href="../../functional/concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic
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Function Object</a>, <code class="computeroutput"><span class="identifier">f</span></code>.</td>
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</tr>
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<tr>
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<td><code 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">f</span><span class="special">)</span></code></td>
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<td>Creates
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a binary <code class="computeroutput"><span class="identifier">transform_view</span></code>
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given sequences, <code class="computeroutput"><span class="identifier">s1</span></code>
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and <code class="computeroutput"><span class="identifier">s2</span></code> and unary
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<a href="../../functional/concepts/poly.html" title=" Polymorphic Function
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Object">Polymorphic Function
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Object</a>, <code class="computeroutput"><span class="identifier">f</span></code>.</td>
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</tr>
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<tr>
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<td><code class="computeroutput"><span class="identifier">TV</span><span class="special">(</span><span class="identifier">tv</span><span class="special">)</span></code></td>
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<td>Copy
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constructs a <code class="computeroutput"><span class="identifier">transform_view</span></code>
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from another <code class="computeroutput"><span class="identifier">transform_view</span></code>,
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<code class="computeroutput"><span class="identifier">tv</span></code>.</td>
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</tr>
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<tr>
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<td><code class="computeroutput"><span class="identifier">tv</span> <span class="special">=</span>
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<span class="identifier">tv2</span></code></td>
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<td>Assigns
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to a <code class="computeroutput"><span class="identifier">transform_view</span></code>,
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<code class="computeroutput"><span class="identifier">tv</span></code>, from another
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<code class="computeroutput"><span class="identifier">transform_view</span></code>,
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<code class="computeroutput"><span class="identifier">tv2</span></code>.</td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.sequences.views.transform_view.example"></a><h5>
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<a name="id998984"></a>
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<a href="transform_view.html#fusion.sequences.views.transform_view.example">Example</a>
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</h5>
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<pre class="programlisting">
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<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">T</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="identifier">T</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">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="../containers/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></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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<td align="left"></td>
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<td align="right"><small>Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger</small></td>
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