ceph/src/boost/libs/mpl/doc/refmanual/zip-view.html

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   7 <title>The MPL Reference Manual: zip_view</title>
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  11 <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./transform-view.html" class="navigation-link">Prev</a>&nbsp;<a href="./intrinsic-metafunctions.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./transform-view.html" class="navigation-link">Back</a>&nbsp;Along</span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./views.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
  12 <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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  14 <div class="section" id="zip-view">
  15 <h1><a class="toc-backref" href="./views.html#id1423">zip_view</a></h1>
  16 <div class="section" id="id167">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename <a href="./sequences.html" class="identifier">Sequences</a>
  21     &gt;
  22 struct <a href="./zip-view.html" class="identifier">zip_view</a>
  23 {
  24     // <em>unspecified</em>
  25     // <em>...</em>
  26 };
  27 </pre>
  28 </div>
  29 <div class="section" id="id168">
  30 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  31 <p>Provides a &quot;zipped&quot; view onto several sequences; that is, represents several
  32 sequences as a single sequence of elements each of which, in turn,
  33 is a sequence of the corresponding <tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt>' elements.</p>
  34 </div>
  35 <div class="section" id="id169">
  36 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  37 <pre class="literal-block">
  38 #include &lt;<a href="../../../../boost/mpl/zip_view.hpp" class="header">boost/mpl/zip_view.hpp</a>&gt;
  39 </pre>
  40 </div>
  41 <div class="section" id="id170">
  42 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  43 <ul class="simple">
  44 <li><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></li>
  45 </ul>
  46 </div>
  47 <div class="section" id="id171">
  48 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  49 <table border="1" class="docutils table">
  50 <colgroup>
  51 <col width="19%" />
  52 <col width="43%" />
  53 <col width="38%" />
  54 </colgroup>
  55 <thead valign="bottom">
  56 <tr><th class="head">Parameter</th>
  57 <th class="head">Requirement</th>
  58 <th class="head">Description</th>
  59 </tr>
  60 </thead>
  61 <tbody valign="top">
  62 <tr><td><tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt></td>
  63 <td>A <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of
  64 <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s</td>
  65 <td>Sequences to be &quot;zipped&quot;.</td>
  66 </tr>
  67 </tbody>
  68 </table>
  69 </div>
  70 <div class="section" id="id172">
  71 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  72 <p>The semantics of an expression are defined only
  73 where they differ from, or are not defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
  74 <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>
  75 <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s.</p>
  76 <table border="1" class="docutils table">
  77 <colgroup>
  78 <col width="34%" />
  79 <col width="66%" />
  80 </colgroup>
  81 <thead valign="bottom">
  82 <tr><th class="head">Expression</th>
  83 <th class="head">Semantics</th>
  84 </tr>
  85 </thead>
  86 <tbody valign="top">
  87 <tr><td><pre class="first last literal-block">
  88 <a href="./zip-view.html" class="identifier">zip_view</a>&lt;seq&gt;
  89 <a href="./zip-view.html" class="identifier">zip_view</a>&lt;seq&gt;::type
  90 </pre>
  91 </td>
  92 <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>
  93 in [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;v&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;v&gt;::type</span></tt>) and for each <tt class="literal"><span class="pre">j</span></tt> in
  94 [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;seq&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;seq&gt;::type</span></tt>)
  95 <tt class="literal"><span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;i&gt;::type</span></tt> is identical to
  96 <tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a>&lt;</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;j&gt;::type,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;</span> <span class="pre">&gt;::type</span></tt>.</td>
  97 </tr>
  98 <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;v&gt;::type</span></tt></td>
  99 <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>&lt;v&gt;::value</span></tt> is equal to</p>
 100 <pre class="literal-block">
 101 <a href="./deref.html" class="identifier">deref</a>&lt; <a href="./min-element.html" class="identifier">min_element</a>&lt;
 102       <a href="./transform-view.html" class="identifier">transform_view</a>&lt; seq, <a href="./size.html" class="identifier">size</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt; &gt;
 103     &gt;::type &gt;::type::value;
 104 </pre>
 105 <p class="last">linear complexity; see <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
 106 </td>
 107 </tr>
 108 </tbody>
 109 </table>
 110 </div>
 111 <div class="section" id="id173">
 112 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 113 <p>Element-wise sum of three vectors.</p>
 114 <pre class="literal-block">
 115 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,2,3,4,5&gt; v1;
 116 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,5,4,3,2,1&gt; v2;
 117 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,1,1,1,1&gt; v3;
 118
 119 typedef <a href="./transform-view.html" class="identifier">transform_view</a>&lt;
 120       <a href="./zip-view.html" class="identifier">zip_view</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;v1,v2,v3&gt; &gt;
 121     , <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt; <a href="./plus.html" class="identifier">plus</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_3</a>&gt; &gt;
 122     &gt; sum;
 123
 124 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; sum, <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,7,7,7,7,7&gt; > ));
 125 </pre>
 126 </div>
 127 <div class="section" id="id174">
 128 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 129 <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>
 130 </div>
 131 </div>
 132
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 135 <td><div class="copyright-footer"><div class="copyright">Copyright ©  2001-2009 Aleksey Gurtovoy and David Abrahams</div>
 136 Distributed under the Boost Software License, Version 1.0. (See accompanying
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