1<HTML> 2<!-- 3 Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000 4 5 Distributed under the Boost Software License, Version 1.0. 6 (See accompanying file LICENSE_1_0.txt or copy at 7 http://www.boost.org/LICENSE_1_0.txt) 8 --> 9<Head> 10<Title>Boost Graph Library: ColorValue Concept</Title> 11<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" 12 ALINK="#ff0000"> 13<IMG SRC="../../../boost.png" 14 ALT="C++ Boost" width="277" height="86"> 15 16<BR Clear> 17 18 19<H1><A NAME="concept:ColorValue"></A> 20ColorValue 21</H1> 22 23<P> 24This concept describes the requirements for the type used for color 25values, as in for coloring a graph during a breath-first search to 26mark which vertices have been visited. 27 28<P> 29 30<h3>Refinement of</h3> <a 31href="http://www.boost.org/sgi/stl/EqualityComparable.html">EqualityComparable</a> 32and <a 33href="http://www.boost.org/sgi/stl/DefaultConstructible.html">DefaultConstructible</a> 34 35 36<h3>Notation</h3> 37 38<Table> 39<TR> 40<TD><tt>T</tt></TD> 41<TD>A type that is a model of ColorValue.</TD> 42</TR> 43 44<TR> 45<TD><tt>cv</tt></TD> 46<TD>An object of type <tt>T</tt>.</TD> 47</TR> 48 49</table> 50 51<h3>Valid Expressions</h3> 52 53<Table border> 54 55<tr> 56<th>Name</th><th>Expression</th><th>Return Type</th><th>Description</th> 57</tr> 58 59<tr> 60<td>Get Color White </td> 61<TD><TT>color_traits<T>::white()</TT></TD> 62<TD><TT>T</TT></TD> 63<TD>Returns an object that represents the color white.</TD> 64</TR> 65 66<tr> 67<td>Get Color Gray </td> 68<TD><TT>color_traits<T>::gray()</TT></TD> 69<TD><TT>T</TT></TD> 70<TD>Returns an object that represents the color gray.</TD> 71</TR> 72 73<tr> 74<td>Get Color Black </td> 75<TD><TT>color_traits<T>::black()</TT></TD> 76<TD><TT>T</TT></TD> 77<TD>Returns an object that represents the color black.</TD> 78</TR> 79 80</TABLE> 81 82<P> 83</LI> 84</UL> 85 86<h3>Models</h3> 87 88<ul> 89 <li><tt>default_color_type</tt> (in <a href="../../../boost/graph/properties.hpp"><tt>boost/graph/properties.hpp</tt>) 90</ul> 91 92 93<br> 94<HR> 95<TABLE> 96<TR valign=top> 97<TD nowrap>Copyright © 2000-2001</TD><TD> 98<A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>, 99Indiana University (<A 100HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br> 101<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> 102<A HREF="https://homes.cs.washington.edu/~al75">Andrew Lumsdaine</A>, 103Indiana University (<A 104HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>) 105</TD></TR></TABLE> 106 107</BODY> 108</HTML> 109
