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7<title>The MPL Reference Manual: remove_if</title>
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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./remove.html" class="navigation-link">Prev</a>&nbsp;<a href="./unique.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./remove.html" class="navigation-link">Back</a>&nbsp;<a href="./unique.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./transformation-algorithms.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="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./transformation-algorithms.html" class="navigation-link">Transformation Algorithms</a> / <a href="./remove-if.html" class="navigation-link">remove_if</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="remove-if">
15<h1><a class="toc-backref" href="./transformation-algorithms.html#id420" name="remove-if">remove_if</a></h1>
16<div class="section" id="transformation-remove-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    , typename Pred
22    , typename In = <em>unspecified</em>
23    &gt;
24struct <a href="./remove-if.html" class="identifier">remove_if</a>
25{
26    typedef <em>unspecified</em> type;
27};
28</pre>
29</div>
30<div class="section" id="transformation-remove-description">
31<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
32<p>Returns a new sequence that contains all the elements from [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;Sequence&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Sequence&gt;::type</span></tt>) range
33except those that satisfy the predicate <tt class="literal"><span class="pre">Pred</span></tt>.</p>
34<!-- Returns a copy of the original sequence with all elements satisfying the predicate
35``Pred`` removed. -->
36<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
37<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
38details in all cases — <em>end note</em>]</p>
39</div>
40<div class="section" id="transformation-remove-header">
41<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
42<pre class="literal-block">
43#include &lt;<a href="../../../../boost/mpl/remove_if.hpp" class="header">boost/mpl/remove_if.hpp</a>&gt;
44</pre>
45</div>
46<div class="section" id="transformation-remove-model-of">
47<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
48<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
49</div>
50<div class="section" id="transformation-remove-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">Sequence</span></tt></td>
66<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
67<td>An original sequence.</td>
68</tr>
69<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
70<td>Unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
71<td>A removal condition.</td>
72</tr>
73<tr><td><tt class="literal"><span class="pre">In</span></tt></td>
74<td><a class="reference" href="./inserter.html">Inserter</a></td>
75<td>An inserter.</td>
76</tr>
77</tbody>
78</table>
79</div>
80<div class="section" id="transformation-remove-expression-semantics">
81<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
82<p>The semantics of an expression are defined only
83where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
84<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and an <a class="reference" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>, and an unary
85<a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>:</p>
86<pre class="literal-block">
87typedef <a href="./remove-if.html" class="identifier">remove_if</a>&lt;s,pred,in&gt;::type r;
88</pre>
89<table class="field-list" frame="void" rules="none">
90<col class="field-name" />
91<col class="field-body" />
92<tbody valign="top">
93<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
94</tr>
95<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
96<pre class="last literal-block">
97typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
98typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type op;
99
100typedef <a href="./fold.html" class="identifier">fold</a>&lt;
101      s
102    , in::state
103    , <a href="./eval-if.html" class="identifier">eval_if</a>&lt;
104          <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>&lt;p,_2&gt;
105        , <a href="./identity.html" class="identifier">identity</a>&lt;_1&gt;
106        , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;op,_1,_2&gt;
107        &gt;
108    &gt;::type r;
109</pre>
110</td>
111</tr>
112</tbody>
113</table>
114</div>
115<div class="section" id="transformation-remove-complexity">
116<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
117<p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and at
118most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
119</div>
120<div class="section" id="transformation-remove-example">
121<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
122<pre class="literal-block">
123typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,5,2,7,5,3,5&gt;::type numbers;
124typedef <a href="./remove-if.html" class="identifier">remove_if</a>&lt; numbers, <a href="./greater.html" class="identifier">greater</a>&lt;_,<a href="./int.html" class="identifier">int_</a>&lt;4&gt; &gt; &gt;::type result;
125
126<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,<a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,2,3&gt;,<a href="./equal-to.html" class="identifier">equal_to</a>&lt;_,_&gt; > ));
127</pre>
128</div>
129<div class="section" id="transformation-remove-see-also">
130<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
131<p><a class="reference" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="refentry reference" href="./reverse-remove-if.html"><tt class="refentry literal"><span class="pre">reverse_remove_if</span></tt></a>, <a class="refentry reference" href="./remove.html"><tt class="refentry literal"><span class="pre">remove</span></tt></a>, <a class="refentry reference" href="./copy-if.html"><tt class="refentry literal"><span class="pre">copy_if</span></tt></a>, <a class="refentry reference" href="./replace-if.html"><tt class="refentry literal"><span class="pre">replace_if</span></tt></a></p>
132<!-- modtime: November 10, 2004 04:33:13 +0000 -->
133<!-- Algorithms/Transformation Algorithms//unique |80 -->
134</div>
135</div>
136
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