Generic Function Add-Edge-Between-Vertexes (2 methods)
(
add-edge-between-vertexes < graph > < value-or-vertex-1 > < value-or-vertex-2 > &rest < args > &key < if-duplicate-do > < edge-type > )
Adds an edge between two vertexes and returns it.
If force-new? is true,
the edge is added even if one already exists.
If the vertexes are not
found in the graph, they will be added (unless :error-if-not-found? is
true). The class of the edge can be specified using :edge-class or
:edge-type. If :edge-type is used, it can be either :directed or
:undirected; the actual class of the edge will be determined by using
the edge-types of the graph. If neither :edge-type nor :edge-class is
specified, then a directed edge will be created.
If-duplicate-do is used when the 'same' edge is added more than once. It can be
either a function on one variable or :ignore or :force. If it is :ignore, then
the previously added edge is returned; if it is :force, then another edge is
added between the two vertexes; if it is a function, then this function will
be called with the previous edge.
Method Summary
