/**
* create new Vertices instance
*
* You can pass in just about anything that can be expressed as a Set of
* Vertices, such as:
* - an array of Vertex instances
* - any Algorithm that implements the VerticesAggregate interface
* - a Graph instance or
* - an existing Set of Vertices which will be returned as-is
*
* @param array|Vertices|VerticesAggregate $vertices
* @return Vertices
*/
public static function factory($vertices)
{
if ($vertices instanceof VerticesAggregate) {
return $vertices->getVertices();
}
return new self($vertices);
}
