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10<title>The MPL Reference Manual: zip_view</title>
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13<body class="docframe refmanual">
14<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>
15<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>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="zip-view">
18<h1><a class="toc-backref" href="./views.html#id351" name="zip-view">zip_view</a></h1>
19<div class="section" id="zip-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename <a href="./sequences.html" class="identifier">Sequences</a>
24    &gt;
25struct <a href="./zip-view.html" class="identifier">zip_view</a>
26{
27    // <em>unspecified</em>
28    // <em>...</em>
29};
30</pre>
31</div>
32<div class="section" id="zip-description">
33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
34<p>Provides a &quot;zipped&quot; view onto several sequences; that is, represents several
35sequences as a single sequence of elements each of which, in turn,
36is a sequence of the corresponding <tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt>' elements.</p>
37</div>
38<div class="section" id="zip-header">
39<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
40<pre class="literal-block">
41#include &lt;<a href="../../../../boost/mpl/zip_view.hpp" class="header">boost/mpl/zip_view.hpp</a>&gt;
42</pre>
43</div>
44<div class="section" id="zip-model-of">
45<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
46<ul class="simple">
47<li><a class="reference" href="./forward-sequence.html">Forward Sequence</a></li>
48</ul>
49</div>
50<div class="section" id="zip-parameters">
51<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
52<table border="1" class="table">
53<colgroup>
54<col width="19%" />
55<col width="43%" />
56<col width="38%" />
57</colgroup>
58<thead valign="bottom">
59<tr><th>Parameter</th>
60<th>Requirement</th>
61<th>Description</th>
62</tr>
63</thead>
64<tbody valign="top">
65<tr><td><tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt></td>
66<td>A <a class="reference" href="./forward-sequence.html">Forward Sequence</a> of
67<a class="reference" href="./forward-sequence.html">Forward Sequence</a>s</td>
68<td>Sequences to be &quot;zipped&quot;.</td>
69</tr>
70</tbody>
71</table>
72</div>
73<div class="section" id="zip-expression-semantics">
74<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
75<p>The semantics of an expression are defined only
76where they differ from, or are not defined in <a class="reference" href="./forward-sequence.html">Forward Sequence</a>.</p>
77<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" href="./forward-sequence.html">Forward Sequence</a> of <tt class="literal"><span class="pre">n</span></tt>
78<a class="reference" href="./forward-sequence.html">Forward Sequence</a>s.</p>
79<table border="1" class="table">
80<colgroup>
81<col width="34%" />
82<col width="66%" />
83</colgroup>
84<thead valign="bottom">
85<tr><th>Expression</th>
86<th>Semantics</th>
87</tr>
88</thead>
89<tbody valign="top">
90<tr><td><pre class="first last literal-block">
91<a href="./zip-view.html" class="identifier">zip_view</a>&lt;seq&gt;
92<a href="./zip-view.html" class="identifier">zip_view</a>&lt;seq&gt;::type
93</pre>
94</td>
95<td>A lazy <a class="reference" 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>
96in [<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
97[<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>)
98<tt class="literal"><span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;i&gt;::type</span></tt> is identical to
99<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;_1&gt;</span> <span class="pre">&gt;::type</span></tt>.</td>
100</tr>
101<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;v&gt;::type</span></tt></td>
102<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>
103<pre class="literal-block">
104<a href="./deref.html" class="identifier">deref</a>&lt; <a href="./min-element.html" class="identifier">min_element</a>&lt;
105      <a href="./transform-view.html" class="identifier">transform_view</a>&lt; seq, <a href="./size.html" class="identifier">size</a>&lt;_1&gt; &gt;
106    &gt;::type &gt;::type::value;
107</pre>
108<p class="last">linear complexity; see <a class="reference" href="./forward-sequence.html">Forward Sequence</a>.</p>
109</td>
110</tr>
111</tbody>
112</table>
113</div>
114<div class="section" id="zip-example">
115<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
116<p>Element-wise sum of three vectors.</p>
117<pre class="literal-block">
118typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,2,3,4,5&gt; v1;
119typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,5,4,3,2,1&gt; v2;
120typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,1,1,1,1&gt; v3;
121
122typedef <a href="./transform-view.html" class="identifier">transform_view</a>&lt;
123      <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;
124    , <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt; <a href="./plus.html" class="identifier">plus</a>&lt;_1,_2,_3&gt; &gt;
125    &gt; sum;
126
127<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; > ));
128</pre>
129</div>
130<div class="section" id="zip-see-also">
131<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
132<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./views.html">Views</a>, <a class="refentry reference" href="./filter-view.html"><tt class="refentry literal"><span class="pre">filter_view</span></tt></a>, <a class="refentry reference" href="./transform-view.html"><tt class="refentry literal"><span class="pre">transform_view</span></tt></a>, <a class="refentry reference" href="./joint-view.html"><tt class="refentry literal"><span class="pre">joint_view</span></tt></a>, <a class="refentry reference" href="./single-view.html"><tt class="refentry literal"><span class="pre">single_view</span></tt></a>, <a class="refentry reference" href="./iterator-range.html"><tt class="refentry literal"><span class="pre">iterator_range</span></tt></a></p>
133<!-- modtime: November 13, 2004 01:15:49 +0000 -->
134</div>
135</div>
136
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