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It provides an easy-to-use graph data structure together with several
operations and algorithms over graphs, in Graph.Pack. It is a reasonably
efficient imperative data structure for directed graphs with vertices
and edges labeled with integers. Several other graph implementations
are proposed for those not satisfied with the one above. Some are
persistent (imutable) and other imperative (mutable). Some are directed
and other are not. Some have labels for vertices, or labels for edges,
or both. Some have abstract types for vertices. etc. These
implementations are written as functors: you give the types of vertices
labels, edge labels, etc. and you get the data structure as a result.
it also provides several classic operations and algorithms over graphs.
They are also written as functors i.e. independently of the data
structure for graphs. One consequence is that you can define your own
data structure for graphs and yet re-use all the algorithms from this
library: you only need to provide a few operations such as iterating
over all vertices, over the successors of a vertex, etc.