/// <summary>
/// Initializes a new instance of the <see cref="LayeredTopologicalSortAlgorithm{TVertex,TEdge}"/> class.
/// </summary>
/// <param name="visitedGraph">Graph to visit.</param>
public LayeredTopologicalSortAlgorithm(
[NotNull] IVertexAndEdgeListGraph <TVertex, TEdge> visitedGraph)
: base(visitedGraph)
{
// Create a copy from the graph
_tmpGraph = visitedGraph.CopyToBidirectionalGraph();
}