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6<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
7<title>The MPL Reference Manual: zip_view</title>
8<link rel="stylesheet" href="../style.css" type="text/css" />
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10<body class="docframe refmanual">
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>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="zip-view">
15<h1><a class="toc-backref" href="./views.html#id351" name="zip-view">zip_view</a></h1>
16<div class="section" id="zip-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename <a href="./sequences.html" class="identifier">Sequences</a>
21    &gt;
22struct <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="zip-description">
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
32sequences as a single sequence of elements each of which, in turn,
33is 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="zip-header">
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="zip-model-of">
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" href="./forward-sequence.html">Forward Sequence</a></li>
45</ul>
46</div>
47<div class="section" id="zip-parameters">
48<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
49<table border="1" class="table">
50<colgroup>
51<col width="19%" />
52<col width="43%" />
53<col width="38%" />
54</colgroup>
55<thead valign="bottom">
56<tr><th>Parameter</th>
57<th>Requirement</th>
58<th>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" href="./forward-sequence.html">Forward Sequence</a> of
64<a class="reference" 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="zip-expression-semantics">
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
73where they differ from, or are not defined in <a class="reference" 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" href="./forward-sequence.html">Forward Sequence</a> of <tt class="literal"><span class="pre">n</span></tt>
75<a class="reference" href="./forward-sequence.html">Forward Sequence</a>s.</p>
76<table border="1" class="table">
77<colgroup>
78<col width="34%" />
79<col width="66%" />
80</colgroup>
81<thead valign="bottom">
82<tr><th>Expression</th>
83<th>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" 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>
93in [<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;_1&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;_1&gt; &gt;
103    &gt;::type &gt;::type::value;
104</pre>
105<p class="last">linear complexity; see <a class="reference" href="./forward-sequence.html">Forward Sequence</a>.</p>
106</td>
107</tr>
108</tbody>
109</table>
110</div>
111<div class="section" id="zip-example">
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">
115typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,2,3,4,5&gt; v1;
116typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,5,4,3,2,1&gt; v2;
117typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,1,1,1,1&gt; v3;
118
119typedef <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;_1,_2,_3&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="zip-see-also">
128<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
129<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>
130<!-- modtime: November 13, 2004 01:15:49 +0000 -->
131</div>
132</div>
133
134<div class="footer-separator"></div>
135<table class="footer"><tr class="footer"><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>
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