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updated boost from 1_33_1 to 1_34_1
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10<title>The MPL Reference Manual: clear</title>
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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="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./clear.html" class="navigation-link">clear</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="clear">
18<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id357" name="clear">clear</a></h1>
19<div class="section" id="clear-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename Sequence
24    &gt;
25struct <a href="./clear.html" class="identifier">clear</a>
26{
27    typedef <em>unspecified</em> type;
28};
29</pre>
30</div>
31<div class="section" id="clear-description">
32<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
33<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>
34</div>
35<div class="section" id="clear-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/clear.hpp" class="header">boost/mpl/clear.hpp</a>&gt;
39</pre>
40</div>
41<div class="section" id="clear-model-of">
42<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
43<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
44</div>
45<div class="section" id="clear-parameters">
46<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
47<table border="1" class="table">
48<colgroup>
49<col width="17%" />
50<col width="39%" />
51<col width="44%" />
52</colgroup>
53<thead valign="bottom">
54<tr><th>Parameter</th>
55<th>Requirement</th>
56<th>Description</th>
57</tr>
58</thead>
59<tbody valign="top">
60<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
61<td><a class="reference" href="./extensible-sequence.html">Extensible Sequence</a> or
62<a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
63<td>A sequence to get an empty &quot;copy&quot; of.</td>
64</tr>
65</tbody>
66</table>
67</div>
68<div class="section" id="clear-expression-semantics">
69<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
70<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>
71<pre class="literal-block">
72typedef <a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type t;
73</pre>
74<table class="field-list" frame="void" rules="none">
75<col class="field-name" />
76<col class="field-body" />
77<tbody valign="top">
78<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>
79</tr>
80<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
81<pre class="last literal-block">
82typedef <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;
83</pre>
84</td>
85</tr>
86<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>
87</tr>
88</tbody>
89</table>
90</div>
91<div class="section" id="clear-complexity">
92<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
93<p>Amortized constant time.</p>
94</div>
95<div class="section" id="clear-example">
96<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
97<pre class="literal-block">
98typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,3,5,7,9,11&gt; odds;
99typedef <a href="./clear.html" class="identifier">clear</a>&lt;odds&gt;::type nothing;
100
101<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./empty.html" class="identifier">empty</a>&lt;nothing&gt; ));
102</pre>
103</div>
104<div class="section" id="clear-see-also">
105<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
106<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>
107<!-- modtime: November 13, 2004 01:25:47 +0000 -->
108<!-- Sequences/Intrinsic Metafunctions//empty -->
109</div>
110</div>
111
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