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<!--
-- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
--
-- 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)
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<Head>
<Title>Boost Graph Library: ColorValue Concept</Title>
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ALINK="#ff0000">
<IMG SRC="../../../boost.png"
ALT="C++ Boost" width="277" height="86">
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<H1><A NAME="concept:ColorValue"></A>
ColorValue
</H1>
<P>
This concept describes the requirements for the type used for color
values, as in for coloring a graph during a breath-first search to
mark which vertices have been visited.
<P>
<h3>Refinement of</h3> <a
href="http://www.sgi.com/tech/stl/EqualityComparable.html">EqualityComparable</a>
and <a
href="http://www.sgi.com/tech/stl/DefaultConstructible.html">DefaultConstructible</a>
<h3>Notation</h3>
<Table>
<TR>
<TD><tt>T</tt></TD>
<TD>A type that is a model of ColorValue.</TD>
</TR>
<TR>
<TD><tt>cv</tt></TD>
<TD>An object of type <tt>T</tt>.</TD>
</TR>
</table>
<h3>Valid Expressions</h3>
<Table border>
<tr>
<th>Name</th><th>Expression</th><th>Return Type</th><th>Description</th>
</tr>
<tr>
<td>Get Color White </td>
<TD><TT>color_traits<T>::white()</TT></TD>
<TD><TT>T</TT></TD>
<TD>Returns an object that represents the color white.</TD>
</TR>
<tr>
<td>Get Color Gray </td>
<TD><TT>color_traits<T>::gray()</TT></TD>
<TD><TT>T</TT></TD>
<TD>Returns an object that represents the color gray.</TD>
</TR>
<tr>
<td>Get Color Black </td>
<TD><TT>color_traits<T>::black()</TT></TD>
<TD><TT>T</TT></TD>
<TD>Returns an object that represents the color black.</TD>
</TR>
</TABLE>
<P>
</LI>
</UL>
<h3>Models</h3>
<ul>
<li><tt>default_color_type</tt> (in <a href="../../../boost/graph/properties.hpp"><tt>boost/graph/properties.hpp</tt>)
</ul>
<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright © 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></TABLE>
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