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7<title>The MPL Reference Manual: empty_sequence</title>
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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./views.html" class="navigation-link">Prev</a>&nbsp;<a href="./filter-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group">Back&nbsp;<a href="./filter-view.html" class="navigation-link">Along</a></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="./empty-sequence.html" class="navigation-link">empty_sequence</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="empty-sequence">
15<h1><a class="toc-backref" href="./views.html#id345" name="empty-sequence">empty_sequence</a></h1>
16<div class="section" id="empty-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19struct <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
20{
21    // <em>unspecified</em>
22    // <em>...</em>
23};
24</pre>
25</div>
26<div class="section" id="empty-description">
27<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
28<p>Represents a sequence containing no elements.</p>
29</div>
30<div class="section" id="empty-header">
31<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
32<pre class="literal-block">
33#include &lt;<a href="../../../../boost/mpl/empty_sequence.hpp" class="header">boost/mpl/empty_sequence.hpp</a>&gt;
34</pre>
35</div>
36<div class="section" id="empty-expression-semantics">
37<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
38<p>The semantics of an expression are defined only
39where they differ from, or are not defined in <a class="reference" href="./random-access-sequence.html">Random Access Sequence</a>.</p>
40<p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt>.</p>
41<table border="1" class="table">
42<colgroup>
43<col width="34%" />
44<col width="66%" />
45</colgroup>
46<thead valign="bottom">
47<tr><th>Expression</th>
48<th>Semantics</th>
49</tr>
50</thead>
51<tbody valign="top">
52<tr><td><tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt></td>
53<td>An empty <a class="reference" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
54</tr>
55<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::type</span></tt></td>
56<td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">==</span> <span class="pre">0</span></tt>; see <a class="reference" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
57</tr>
58</tbody>
59</table>
60</div>
61<div class="section" id="empty-example">
62<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
63<pre class="literal-block">
64typedef <a href="./begin.html" class="identifier">begin</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::type first;
65typedef <a href="./end.html" class="identifier">end</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::type last;
66
67<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;first,last&gt; ));
68<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::value, ==, 0 );
69
70typedef <a href="./transform-view.html" class="identifier">transform_view</a>&lt;
71      <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
72    , add_pointer&lt;_&gt;
73    &gt; empty_view;
74
75<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::value, ==, 0 );
76</pre>
77</div>
78<div class="section" id="empty-see-also">
79<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
80<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./views.html">Views</a>, <a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a>, <a class="refentry reference" href="./list.html"><tt class="refentry literal"><span class="pre">list</span></tt></a>, <a class="refentry reference" href="./single-view.html"><tt class="refentry literal"><span class="pre">single_view</span></tt></a></p>
81<!-- modtime: November 13, 2004 20:20:53 +0000 -->
82<!-- Sequences/Views//filter_view -->
83</div>
84</div>
85
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