<html>
<!--
Copyright (c) 2013 Eurodecision
Authors: Guillaume Pinot
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
-->
<head>
<title>Compose Property Map Adaptor</title>
</head>
<body bgcolor="#ffffff" link="#0000ee" text="#000000" vlink="#551a8b"
alink="#ff0000">
<img src="../../../boost.png"
alt="C++ Boost" width="277" height="86">
<br Clear>
<h2>
<a name="sec:compose-property-map"></a>Compose Property Map
Adaptor
</h2>
<pre>
compose_property_map<FPMap, GPMap>
</pre>
<p>
This property map is an adaptor that composes two property map. The
new property map will of the same model
as <tt>FPMap</tt>. <tt>GPMap</tt> must
model <a href="./ReadablePropertyMap.html">Readable Property Map</a>.
</p>
<h3>Example</h3>
<a href="../example/compose_property_map_example.cpp">compose_property_map_example.cpp</a>:
<pre>
#include <boost/property_map/compose_property_map.hpp>
#include <iostream>
int main()
{
const int idx[] = {2, 0, 4, 1, 3};
double v[] = {1., 3., 0., 4., 2.};
boost::compose_property_map<double*, const int*> cpm(v, idx);
for (int i = 0; i < 5; ++i)
std::cout << get(cpm, i) << " ";
std::cout << std::endl;
for (int i = 0; i < 5; ++i)
++cpm[i];
for (int i = 0; i < 5; ++i)
std::cout << get(cpm, i) << " ";
std::cout << std::endl;
for (int i = 0; i < 5; ++i)
put(cpm, i, 42.);
for (int i = 0; i < 5; ++i)
std::cout << get(cpm, i) << " ";
std::cout << std::endl;
return 0;
}
</pre>
<p>Output:</p>
<pre>
0 1 2 3 4
1 2 3 4 5
42 42 42 42 42
</pre>
<h3>Where Defined</h3>
<p>
<a href="../../../boost/property_map/compose_property_map.hpp"><tt>boost/property_map/compose_property_map.hpp</tt></a>
</p>
<h3>Template Parameters</h3>
<P>
<table border>
<tr>
<th>Parameter</th><th>Description</th>
</tr>
<tr>
<td><tt>FPMap</tt></td>
<td>Must be a property map of any kind.</td>
</tr>
<tr>
<td><tt>GPMap</tt></td>
<td>Must be a model of <a href="./ReadablePropertyMap.html">Readable Property Map</a>.</td>
</tr>
</table>
<H3>Members</H3>
<p>
In addition to the methods and functions required by property maps,
this class has the following members:
</p>
<hr>
<pre>
compose_property_map(const FPMap& f, const GPMap& g);
</pre>
Constructor.
<hr>
<h3>Non-Member functions</h3>
<hr>
<pre>
template <class FPMap, class GPMap>
compose_property_map<FPMap, GPMap>
make_compose_property_map(const FPMap& f, const GPMap& g);
</pre>
Returns a <tt>compose_property_map</tt> using the given property maps type.
<hr>
<table>
<tr valign="top">
<td nowrap>Copyright © 2013</td>
<td>Eurodecision</td>
</tr>
<tr valign="top">
<td nowrap>Author:</td>
<td>Guillaume Pinot</td>
</tr>
</table>
</body>
</html>