<HTML>
<!--
     Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
     Copyright (c) 2010 Matthias Walter (xammy@xammy.homelinux.net)
     Copyright (c) 2010 Trustees of Indiana University
    
     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>Boost Graph Library: property_put</Title>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" 
        ALINK="#ff0000"> 
<IMG SRC="../../../boost.png" 
     ALT="C++ Boost" width="277" height="86"> 

<BR Clear>

<H1>
<pre>
property_put&lt;PropertyMap, EventTag&gt;
</pre>
</H1>

This is an <a href="./EventVisitor.html">EventVisitor</a> that can be
used to write a fixed value to a property map when a vertex or edge is
visited at some event-point within an algorithm.  For example, this
visitor can be used as an alternative to a loop to initialize a
property map, or it can be used to mark only back edges with a
property.

<p>
<tt>property_put</tt> can be used with graph algorithms by
wrapping it with the algorithm-specific adaptor, such as <a
href="./bfs_visitor.html"><tt>bfs_visitor</tt></a> and <a
href="./dfs_visitor.html"><tt>dfs_visitor</tt></a>. Also, this event
visitor can be combined with other event visitors using
<tt>std::pair</tt> to form an EventVisitorList.

<h3>Example</h3>

<pre>
  boost::depth_first_search
    (G, boost::visitor(
          boost::make_dfs_visitor(
            boost::put_property(is_back_edge, boost::on_back_edge()))));
</pre>

<h3>Model of</h3>

<a href="./EventVisitor.html">EventVisitor</a>


<H3>Where Defined</H3>

<P>
<a href="../../../boost/graph/visitors.hpp">
<TT>boost/graph/visitors.hpp</TT></a>

<H3>Template Parameters</H3>

<P>
<TABLE border>
<TR>
<th>Parameter</th><th>Description</th><th>Default</th>
</tr>

<TR><TD><TT>PropertyMap</TT></TD>
<TD>
A <a
href="../../property_map/doc/WritablePropertyMap.html">WritablePropertyMap</a>,
where the <tt>key_type</tt> is the vertex descriptor type or edge
descriptor of the graph (depending on the kind of event tag).
</TD>
<TD>&nbsp;</TD>
</TR>

<TR><TD><TT>EventTag</TT></TD>
<TD>
The tag to specify when the <tt>property_put</tt> should be
applied during the graph algorithm.
</TD>
<TD>&nbsp;</TD>
</TR>

</table>

<H2>Associated Types</H2>

<table border>

<tr>
<th>Type</th><th>Description</th>
</tr>

<tr>
<td><tt>property_put::event_filter</tt></td>
<td>
This will be the same type as the template parameter <tt>EventTag</tt>.
</td>
</tr>

</table>

<h3>Member Functions</h3>

<p>

<table border>
<tr>
<th>Member</th><th>Description</th>
</tr>

<tr>
<td><tt>
property_put(PropertyMap pa, property_traits<PropertyMap>::value_type val);
</tt></td>
<td>
Construct a property put object with the property map
<tt>pa</tt> and constant value <tt>val</tt>.
</td>
</tr>

<tr>
<td><tt>
template &lt;class X, class Graph&gt;<br>
void operator()(X x, const Graph& g);
</tt></td>
<td>
This puts the value <tt>val</tt> into the property map for the vertex
or edge <tt>x</tt>.<br>
</td>
</tr>

</table>

<h3>Non-Member Functions</h3>

<table border>
<tr>
<th>Function</th><th>Description</th>
</tr>

<tr><td><tt>
template &lt;class PropertyMap, class EventTag&gt;<br>
property_put&lt;PropertyMap, EventTag&gt;<br>
put_property(PropertyMap pa,
             typename property_traits<PropertyMap>::value_type val,
             EventTag);
</tt></td><td>
A convenient way to create a <tt>property_put</tt>.
</td></tr>

</table>

<h3>See Also</h3>

<a href="./visitor_concepts.html">Visitor concepts</a>
<p>
The following are other event visitors: <a
<a href="./distance_recorder.html"><tt>distance_recorder</tt></a>,
<a href="./predecessor_recorder.html"><tt>predecessor_recorder</tt></a>,
and <a href="./time_stamper.html"><tt>time_stamper</tt></a>.

<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright &copy; 2000-2001</TD><TD>
<A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>,
Indiana University (<A
HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
<A HREF="http://www.boost.org/people/liequan_lee.htm">Lie-Quan Lee</A>, Indiana University (<A HREF="mailto:llee@cs.indiana.edu">llee@cs.indiana.edu</A>)<br>
<A HREF="http://www.osl.iu.edu/~lums">Andrew Lumsdaine</A>,
Indiana University (<A
HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
</TD></TR>
<tr><td>Copyright &copy; 2010</td><td>Matthias Walter (<a href="mailto:xammy@xammy.homelinux.net">xammy@xammy.homelinux.net</a>)</td></tr>
<tr><td></td><td>Trustees of Indiana University</td></tr>
</TABLE>

</BODY>
</HTML> 
<!--  LocalWords:  PropertyMap OutputIterator EventTag EventVisitor bfs dfs EventVisitorList
 -->
<!--  LocalWords:  cpp num dtime ftime int WritablePropertyMap map adaptor
 -->
<!--  LocalWords:  const Siek Univ Quan Lumsdaine typename
 -->