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<Title>Edge Mutable Graph</Title>
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<H2><A NAME="concept:EdgeMutableGraph">
Edge Mutable Graph
</H2>

The <I>Edge Mutable Graph</I> concept defines the interface for a
graph that supports the addition and removal of edges.

<H3>Refinement of</H3>

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

<H3>Associated Types</H3>

No additional associated types.

<h3>Valid Expressions</h3>

<ul>

<li><a name="sec:add_edge"><TT>add_edge(u, v, g)</TT></a> 
<b>returns</b> <TT>std::pair&lt;edge_descriptor,&nbsp;bool&gt;</TT>
<br><br>

<b>Semantics:</b> Try to insert the edge <i>(u,v)</i> into the graph,
returning the inserted edge or a parallel edge and a flag that
specifies whether an edge was inserted.  This operation must not
invalidate vertex descriptors or vertex iterators of the graph, though
it may invalidate edge descriptors or edge iterators.<br>

<b>Preconditions:</b> <i>u</i> and <i>v</i> are vertices in the
graph. <br>

<b>Postconditions:</b> <i>(u,v)</i> is in the edge set of
the graph.  The returned edge descriptor will have <i>u</i> in the
source position and <i>v</i> in the target position. If the graph
allows parallel edges, then the returned flag is always
<tt>true</tt>. If the graph does not allow parallel edges, if
<i>(u,v)</i> was already in the graph then the returned flag is
<tt>false</tt>. If <i>(u,v)</i> was not in the graph then the returned
flag is <tt>true</tt>.<br>
</li><br>

<li><a name="sec:remove_edge_by_pair"><tt>remove_edge(u, v, g)</tt></a>
<b>returns</b> <tt>void</tt><br><br>
<b>Semantics:</b> Remove the edge <i>(u,v)</i> from the graph. If the
graph allows parallel edges this removes all occurrences of <i>(u,v)</i>. <br>
<b>Precondition:</b> <i>(u,v)</i> is in the edge set of the graph. <br>
<b>Postcondition:</b> <i>(u,v)</i> is no longer in the edge set of the graph. <br>
</li><br>

<li>
<a name="sec:remove_edge"><tt>remove_edge(e, g)</tt></a>
<b>returns</b> <tt>void</tt><br><br>
<b>Semantics:</b> Remove the edge <i>e</i> from the graph.<br>
<b>Precondition:</b> <i>e</i> is an edge in the graph. <br>
<b>Postcondition:</b> <i>e</i> is no longer in the edge set for <tt>g</tt>. <br>
</li><br>

<li>
<a name="sec:clear_vertex"><tt>clear_vertex(u, g)</tt></a>
<b>returns</b> <tt>void</tt><br><br>
<b>Semantics:</b> Remove all edges to and from vertex <i>u</i> from the graph. <br>
<b>Precondition:</b> <i>u</i> is a valid vertex descriptor of
<tt>g</tt>. <br> <b>Postconditions:</b> <i>u</i> does not appear as a
source or target of any edge in <tt>g</tt>.
</li>

</ul>


<H3>Complexity guarantees</H3>

<P>
UNDER CONSTRUCTION

<H3>See Also</H3>

<a href="./graph_concepts.html">Graph concepts</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>)
</TD></TR></TABLE>

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