/// <summary>
/// Initializes a new instance of the <see cref="UndirectedGraph{TVertex,TEdge}"/> class that is empty.
/// </summary>
public UndirectedGraph()
{
this._vertices = new(0);
this._edges = new(0);
this._links = new(0, 31);
}
/// <summary>
/// Initializes a new instance of the <see cref="DirectedGraphWithoutInEdges{TVertex,TEdge}"/> class that is empty.
/// </summary>
public DirectedGraphWithoutInEdges()
{
this._vertices = new(0);
this._edges = new(0);
this._links = new(0, 31);
}