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| <title>The MPL Reference Manual: zip_view</title> |
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| <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a> / <a href="./zip-view.html" class="navigation-link">zip_view</a></td> |
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| <div class="section" id="zip-view"> |
| <h1><a class="toc-backref" href="./views.html#id1423">zip_view</a></h1> |
| <div class="section" id="id167"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename <a href="./sequences.html" class="identifier">Sequences</a> |
| > |
| struct <a href="./zip-view.html" class="identifier">zip_view</a> |
| { |
| // <em>unspecified</em> |
| // <em>...</em> |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id168"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>Provides a "zipped" view onto several sequences; that is, represents several |
| sequences as a single sequence of elements each of which, in turn, |
| is a sequence of the corresponding <tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt>' elements.</p> |
| </div> |
| <div class="section" id="id169"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/zip_view.hpp" class="header">boost/mpl/zip_view.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id170"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
| <ul class="simple"> |
| <li><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></li> |
| </ul> |
| </div> |
| <div class="section" id="id171"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
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| <col width="19%" /> |
| <col width="43%" /> |
| <col width="38%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Parameter</th> |
| <th class="head">Requirement</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt></td> |
| <td>A <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of |
| <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s</td> |
| <td>Sequences to be "zipped".</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id172"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>The semantics of an expression are defined only |
| where they differ from, or are not defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p> |
| <p>In the following table, <tt class="literal"><span class="pre">v</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./zip-view.html" class="identifier">zip_view</a></span></tt>, <tt class="literal"><span class="pre">seq</span></tt> a <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of <tt class="literal"><span class="pre">n</span></tt> |
| <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s.</p> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="34%" /> |
| <col width="66%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Expression</th> |
| <th class="head">Semantics</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><pre class="first last literal-block"> |
| <a href="./zip-view.html" class="identifier">zip_view</a><seq> |
| <a href="./zip-view.html" class="identifier">zip_view</a><seq>::type |
| </pre> |
| </td> |
| <td>A lazy <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">v</span></tt> such that for each <tt class="literal"><span class="pre">i</span></tt> |
| in [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><v>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><v>::type</span></tt>) and for each <tt class="literal"><span class="pre">j</span></tt> in |
| [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><seq>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><seq>::type</span></tt>) |
| <tt class="literal"><span class="pre"><a href="./deref.html" class="identifier">deref</a><i>::type</span></tt> is identical to |
| <tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a><</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a><j>::type,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a><<a href="./placeholders.html" class="identifier">_1</a>></span> <span class="pre">>::type</span></tt>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::type</span></tt></td> |
| <td><p class="first">The size of <tt class="literal"><span class="pre">v</span></tt>; <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::value</span></tt> is equal to</p> |
| <pre class="literal-block"> |
| <a href="./deref.html" class="identifier">deref</a>< <a href="./min-element.html" class="identifier">min_element</a>< |
| <a href="./transform-view.html" class="identifier">transform_view</a>< seq, <a href="./size.html" class="identifier">size</a><<a href="./placeholders.html" class="identifier">_1</a>> > |
| >::type >::type::value; |
| </pre> |
| <p class="last">linear complexity; see <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id173"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <p>Element-wise sum of three vectors.</p> |
| <pre class="literal-block"> |
| typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,1,2,3,4,5> v1; |
| typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,5,4,3,2,1> v2; |
| typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,1,1,1,1,1> v3; |
| |
| typedef <a href="./transform-view.html" class="identifier">transform_view</a>< |
| <a href="./zip-view.html" class="identifier">zip_view</a>< <a href="./vector.html" class="identifier">vector</a><v1,v2,v3> > |
| , <a href="./unpack-args.html" class="identifier">unpack_args</a>< <a href="./plus.html" class="identifier">plus</a><<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_3</a>> > |
| > sum; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< sum, <a href="./vector-c.html" class="identifier">vector_c</a><int,7,7,7,7,7> > )); |
| </pre> |
| </div> |
| <div class="section" id="id174"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./filter-view.html">filter_view</a>, <a class="reference internal" href="./transform-view.html">transform_view</a>, <a class="reference internal" href="./joint-view.html">joint_view</a>, <a class="reference internal" href="./single-view.html">single_view</a>, <a class="reference internal" href="./iterator-range.html">iterator_range</a></p> |
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