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7<title>The MPL Reference Manual: clear</title>
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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="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./clear.html" class="navigation-link">clear</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="clear">
15<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id357" name="clear">clear</a></h1>
16<div class="section" id="clear-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Sequence
21    &gt;
22struct <a href="./clear.html" class="identifier">clear</a>
23{
24    typedef <em>unspecified</em> type;
25};
26</pre>
27</div>
28<div class="section" id="clear-description">
29<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
30<p>Returns an empty sequence <a class="reference" href="./terminology.html#concept-identical">concept-identical</a> to <tt class="literal"><span class="pre">Sequence</span></tt>.</p>
31</div>
32<div class="section" id="clear-header">
33<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
34<pre class="literal-block">
35#include &lt;<a href="../../../../boost/mpl/clear.hpp" class="header">boost/mpl/clear.hpp</a>&gt;
36</pre>
37</div>
38<div class="section" id="clear-model-of">
39<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
40<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
41</div>
42<div class="section" id="clear-parameters">
43<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
44<table border="1" class="table">
45<colgroup>
46<col width="17%" />
47<col width="39%" />
48<col width="44%" />
49</colgroup>
50<thead valign="bottom">
51<tr><th>Parameter</th>
52<th>Requirement</th>
53<th>Description</th>
54</tr>
55</thead>
56<tbody valign="top">
57<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
58<td><a class="reference" href="./extensible-sequence.html">Extensible Sequence</a> or
59<a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
60<td>A sequence to get an empty &quot;copy&quot; of.</td>
61</tr>
62</tbody>
63</table>
64</div>
65<div class="section" id="clear-expression-semantics">
66<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
67<p>For any <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
68<pre class="literal-block">
69typedef <a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type t;
70</pre>
71<table class="field-list" frame="void" rules="none">
72<col class="field-name" />
73<col class="field-body" />
74<tbody valign="top">
75<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a>.</td>
76</tr>
77<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
78<pre class="last literal-block">
79typedef <a href="./erase.html" class="identifier">erase</a>&lt; s, <a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type, <a href="./end.html" class="identifier">end</a>&lt;s&gt;::type &gt;::type t;
80</pre>
81</td>
82</tr>
83<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;s&gt;::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</td>
84</tr>
85</tbody>
86</table>
87</div>
88<div class="section" id="clear-complexity">
89<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
90<p>Amortized constant time.</p>
91</div>
92<div class="section" id="clear-example">
93<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
94<pre class="literal-block">
95typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,3,5,7,9,11&gt; odds;
96typedef <a href="./clear.html" class="identifier">clear</a>&lt;odds&gt;::type nothing;
97
98<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./empty.html" class="identifier">empty</a>&lt;nothing&gt; ));
99</pre>
100</div>
101<div class="section" id="clear-see-also">
102<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
103<p><a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a>, <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>, <a class="refentry reference" href="./empty.html"><tt class="refentry literal"><span class="pre">empty</span></tt></a>, <a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a>, <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a></p>
104<!-- modtime: November 13, 2004 01:25:47 +0000 -->
105<!-- Sequences/Intrinsic Metafunctions//empty -->
106</div>
107</div>
108
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