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10<title>The MPL Reference Manual: replace_if</title>
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14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./replace.html" class="navigation-link">Prev</a>&nbsp;<a href="./remove.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./replace.html" class="navigation-link">Back</a>&nbsp;<a href="./remove.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>
15<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="./replace-if.html" class="navigation-link">replace_if</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="replace-if">
18<h1><a class="toc-backref" href="./transformation-algorithms.html#id418" name="replace-if">replace_if</a></h1>
19<div class="section" id="transformation-replace-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    , typename Pred
25    , typename In = <em>unspecified</em>
26    &gt;
27struct <a href="./replace-if.html" class="identifier">replace_if</a>
28{
29    typedef <em>unspecified</em> type;
30};
31</pre>
32</div>
33<div class="section" id="transformation-replace-description">
34<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
35<p>Returns a copy of the original sequence where every type that satisfies
36the predicate <tt class="literal"><span class="pre">Pred</span></tt> has been replaced with <tt class="literal"><span class="pre">NewType</span></tt>.</p>
37<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
38<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
39details in all cases — <em>end note</em>]</p>
40</div>
41<div class="section" id="transformation-replace-header">
42<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
43<pre class="literal-block">
44#include &lt;<a href="../../../../boost/mpl/replace_if.hpp" class="header">boost/mpl/replace_if.hpp</a>&gt;
45</pre>
46</div>
47<div class="section" id="transformation-replace-model-of">
48<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
49<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
50</div>
51<div class="section" id="transformation-replace-parameters">
52<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
53<table border="1" class="table">
54<colgroup>
55<col width="19%" />
56<col width="43%" />
57<col width="38%" />
58</colgroup>
59<thead valign="bottom">
60<tr><th>Parameter</th>
61<th>Requirement</th>
62<th>Description</th>
63</tr>
64</thead>
65<tbody valign="top">
66<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
67<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
68<td>An original sequence.</td>
69</tr>
70<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
71<td>Unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
72<td>A replacement condition.</td>
73</tr>
74<tr><td><tt class="literal"><span class="pre">NewType</span></tt></td>
75<td>Any type</td>
76<td>A type to replace with.</td>
77</tr>
78<tr><td><tt class="literal"><span class="pre">In</span></tt></td>
79<td><a class="reference" href="./inserter.html">Inserter</a></td>
80<td>An inserter.</td>
81</tr>
82</tbody>
83</table>
84</div>
85<div class="section" id="transformation-replace-expression-semantics">
86<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
87<p>The semantics of an expression are defined only
88where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
89<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, an unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>,
90an <a class="reference" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>, and arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
91<pre class="literal-block">
92typedef <a href="./replace-if.html" class="identifier">replace_if</a>&lt;s,pred,x,in&gt;::type r;
93</pre>
94<table class="field-list" frame="void" rules="none">
95<col class="field-name" />
96<col class="field-body" />
97<tbody valign="top">
98<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
99</tr>
100<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
101<pre class="last literal-block">
102typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
103typedef <a href="./transform.html" class="identifier">transform</a>&lt; s, <a href="./if.html" class="identifier">if_</a>&lt; apply_wrap1&lt;p,_1&gt;,x,_1&gt;, in &gt;::type r;
104</pre>
105</td>
106</tr>
107</tbody>
108</table>
109</div>
110<div class="section" id="transformation-replace-complexity">
111<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
112<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 most
113<tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
114</div>
115<div class="section" id="transformation-replace-example">
116<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
117<pre class="literal-block">
118typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,5,2,7,5,3,5&gt; numbers;
119typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,0,2,0,0,3,0&gt; expected;
120typedef <a href="./replace-if.html" class="identifier">replace_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;, <a href="./int.html" class="identifier">int_</a>&lt;0&gt; &gt;::type result;
121
122<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,expected, <a href="./equal-to.html" class="identifier">equal_to</a>&lt;_,_&gt; > ));
123</pre>
124</div>
125<div class="section" id="transformation-replace-see-also">
126<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
127<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-replace-if.html"><tt class="refentry literal"><span class="pre">reverse_replace_if</span></tt></a>, <a class="refentry reference" href="./replace.html"><tt class="refentry literal"><span class="pre">replace</span></tt></a>, <a class="refentry reference" href="./remove-if.html"><tt class="refentry literal"><span class="pre">remove_if</span></tt></a>, <a class="refentry reference" href="./transform.html"><tt class="refentry literal"><span class="pre">transform</span></tt></a></p>
128<!-- modtime: November 10, 2004 04:33:05 +0000 -->
129<!-- Algorithms/Transformation Algorithms//remove |60 -->
130</div>
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