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185 lines
4.1 KiB
HTML
185 lines
4.1 KiB
HTML
<HTML>
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<!--
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-- Copyright (c) Jeremy Siek 2000
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--
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-- Distributed under the Boost Software License, Version 1.0.
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-- (See accompanying file LICENSE_1_0.txt or copy at
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-- http://www.boost.org/LICENSE_1_0.txt)
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-->
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<Head>
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<Title>EdgeListGraph</Title>
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<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
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ALINK="#ff0000">
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<IMG SRC="../../../boost.png"
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ALT="C++ Boost" width="277" height="86">
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<BR Clear>
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<H2><A NAME="concept:EdgeListGraph"></A>
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EdgeListGraph
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</H2>
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The EdgeListGraph concept refines the <a href="./Graph.html">Graph</a>
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concept, and adds the requirement for efficient access to all the
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edges in the graph.
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<H3>Refinement of</H3>
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<a href="./Graph.html">Graph</a>
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<h3>Notation</h3>
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<Table>
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<TR>
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<TD><tt>G</tt></TD>
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<TD>A type that is a model of EdgeListGraph.</TD>
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</TR>
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<TR>
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<TD><tt>g</tt></TD>
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<TD>An object of type <tt>G</tt>.</TD>
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</TR>
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<TR>
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<TD><tt>e</tt></TD>
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<TD>An object of type <tt>boost::graph_traits<G>::edge_descriptor</tt>.</TD>
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</TR>
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</table>
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<H3>Associated Types</H3>
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<table border>
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<tr>
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<td><tt>boost::graph_traits<G>::traversal_category</tt><br><br>
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This tag type must be convertible to <tt>edge_list_graph_tag</tt>.
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</td>
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</tr>
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<tr>
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<td><pre>boost::graph_traits<G>::edge_iterator</pre>
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An edge iterator (obtained via <TT>edges(g)</TT>) provides access to
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all of the edges in a graph. An edge iterator type must meet the
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requirements of <a
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href="../../utility/MultiPassInputIterator.html">MultiPassInputIterator</a>. The
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value type of the edge iterator must be the same as the edge
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descriptor of the graph.
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<tr>
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<td><pre>boost::graph_traits<G>::edges_size_type</pre>
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The unsigned integer type used to represent the number of edges in the
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graph.
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</td>
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</tr>
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</table>
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<h3>Valid Expressions</h3>
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<table border>
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<tr>
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<TD><a name="sec:edges"><TT>edges(g)</TT></a></TD>
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<TD>Returns an iterator-range providing access to all
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the edges in the graph <TT>g</TT>.<br>
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Return type: <TT>std::pair<edge_iterator, edge_iterator></TT>
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</td>
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</TR>
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<tr>
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<TD><TT>num_edges(g)</TT></TD>
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<TD>Returns the number of edges in the graph <TT>g</TT>.<br>
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Return type: <TT>edges_size_type</TT>
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</td>
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</TR>
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<tr>
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<TD><TT>source(e, g)</TT></TD>
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<TD>
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Returns the vertex descriptor for <i>u</i> of the edge <i>(u,v)</i>
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represented by <TT>e</TT>.<br>
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Return type: <TT>vertex_descriptor</TT>
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</td>
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</tr>
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<tr>
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<TD><TT>target(e, g)</TT></TD>
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<TD>
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Returns the vertex descriptor for
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<i>v</i> of the edge <i>(u,v)</i> represented by <TT>e</TT>.<br>
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Return type: <TT>vertex_descriptor</TT>
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</TD>
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</TR>
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</TABLE>
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<H3>Models</H3>
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<UL>
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<LI><a href="./adjacency_list.html"><TT>adjacency_list</TT></a></LI>
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<LI><a href="./edge_list.html"><TT>edge_list</TT></a></LI>
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</UL>
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<H3>Complexity guarantees</H3>
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The <TT>edges()</TT>, <TT>source()</TT>, and <TT>target()</TT> functions
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must all return in constant time.
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<H3>See Also</H3>
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<a href="./graph_concepts.html">Graph concepts</a>
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<H3>Concept Checking Class</H3>
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<P>
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<PRE>
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template <class G>
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struct EdgeListGraphConcept
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{
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typedef typename boost::graph_traits<G>::edge_iterator
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edge_iterator;
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void constraints() {
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function_requires< GraphConcept<G> >();
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function_requires< MultiPassInputIteratorConcept<edge_iterator> >();
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p = edges(g);
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E = num_edges(g);
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e = *p.first;
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u = source(e, g);
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v = target(e, g);
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const_constraints(g);
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}
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void const_constraints(const G& g) {
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p = edges(g);
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E = num_edges(g);
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e = *p.first;
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u = source(e, g);
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v = target(e, g);
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}
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std::pair<edge_iterator,edge_iterator> p;
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typename boost::graph_traits<G>::vertex_descriptor u, v;
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typename boost::graph_traits<G>::edge_descriptor e;
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typename boost::graph_traits<G>::edges_size_type E;
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G g;
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};
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</PRE>
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<br>
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<HR>
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<TABLE>
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<TR valign=top>
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<TD nowrap>Copyright © 2000-2001</TD><TD>
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<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>)
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</TD></TR></TABLE>
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</BODY>
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</HTML>
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