Stores the indexes of an edge's nodes and its label.
Constructor for the EdgeRef class.
EdgeRef
The index of the first vertex of the edge in the diagram.
The index of the second vertex of the edge in the diagram.
The label of the edge in the diagram.
Gets either of the vertices of the edge by their key.
index0 or index1, depending on the value of key.
index0
index1
key
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Stores the indexes of an edge's nodes and its label.