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Boost.RangeEx merged into Boost.Range

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[SVN r60897]
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Neil Groves
2010-03-28 16:08:35 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Boost.Range Range Adaptors </title>
<link rel="stylesheet" href="../style.css" type="text/css">
</head>
<body>
<table border="0" >
<tr>
<td ><img src="../../../boost.png" border="0" /></td>
<td ><h1 align="center">Boost.Range </h1></td>
</tr>
</table>
<h2> Range Adaptors </h2>
<hr />
<a name="map_values"></a>
<h4><code>map_values</code></h4>
<blockquote>
<pre>rng | boost::adaptors::map_values</pre>
<pre>boost::make_map_value_range( rng )</pre>
</blockquote>
<ul>
<li>
<b>Precondition:</b>
The value-type of the range is an instantiation of std::pair.
</li>
<li>
<b>Postcondition:</b>
For all elements <code>x</code> in the returned range,
<code>x</code> is the result of <code>y.second</code> where
<code>y</code> is the corresponding element in the original range.
</li>
<li>
<b>Range Category:</b>
SinglePassRange
</li>
</ul>
<hr />
<h3>Example</h3>
<pre>
<span class="keyword">#include</span> &lt;boost/range/adaptor/map.hpp&gt;
<span class="keyword">#include</span> &lt;boost/range/algorithm/copy.hpp&gt;
<span class="keyword">#include</span> &lt;boost/assign.hpp&gt;
<span class="keyword">#include</span> &lt;algorithm&gt;
<span class="keyword">#include</span> &lt;iostream&gt;
<span class="keyword">#include</span> &lt;map&gt;
<span class="keyword">#include</span> &lt;vector&gt;
<span class="keyword">int</span> main(<span class="keyword">int</span> argc, <span class="keyword">const char</span>* argv[])
{
<span class="keyword">using namespace</span> boost::assign;
<span class="keyword">using namespace</span> boost::adaptors;
std::map&lt;<span class="keyword">int</span>,<span class="keyword">int</span>&gt; input;
<span class="keyword">for</span> (<span class="keyword">int</span> i = 0; i < 10; ++i)
input.insert(std::make_pair(i, i * 10));
boost::copy(
input | map_values,
std::ostream_iterator&lt;<span class="keyword">int</span>&gt;(std::cout, ","));
<span class="keyword">return</span> 0;
}
</pre>
<p>
This produces the output: <br />
<code>
0,10,20,30,40,50,60,70,80,90
</code>
</p>
<hr />
<p>
(C) Copyright Neil Groves 2009
(C) Copyright Thorsten Ottosen 2003-2004
</p>
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</body>
</html>