/**
* Whether an edge between vertices at given indices exists.
*
* @param first_vertex The index of the first vertex.
* @param second_vertex The index of the second vertex.
*
* @return True if the edge exists, false otherwise.
*
* @throws ArgumentException exception if first_vertex or second_vertex
* is negative or greater-or-equal than the number of vertices in the
* graph.
*/
public bool EdgeExists(int first_vertex, int second_vertex)
{
if (first_vertex < 0 || first_vertex >= Size || second_vertex < 0 || second_vertex >= Size)
{
throw new ArgumentException();
}
return(Edges.EdgeExists(first_vertex, second_vertex));
}