Edge Mutable Graph

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

No additional associated types.

add_edge(u, v, g) returns std::pair<edge_descriptor, bool>

Semantics: Try to insert the edge (u,v) 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.
Preconditions: u and v are vertices in the graph.
Postconditions: (u,v) is in the edge set of the graph. The returned edge descriptor will have u in the source position and v in the target position. If the graph allows parallel edges, then the returned flag is always true. If the graph does not allow parallel edges, if (u,v) was already in the graph then the returned flag is false. If (u,v) was not in the graph then the returned flag is true.

remove_edge(u, v, g) returns void

Semantics: Remove the edge (u,v) from the graph. If the graph allows parallel edges this removes all occurrences of (u,v).
Precondition: (u,v) is in the edge set of the graph.
Postcondition: (u,v) is no longer in the edge set of the graph.

remove_edge(e, g) returns void

Semantics: Remove the edge e from the graph.
Precondition: e is an edge in the graph.
Postcondition: e is no longer in the edge set for g.

clear_vertex(u, g) returns void

Semantics: Remove all edges to and from vertex u from the graph.
Precondition: u is a valid vertex descriptor of g.
Postconditions: u does not appear as a source or target of any edge in g.

UNDER CONSTRUCTION

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