public WeightingComparer(Weightings weights)
 {
     if (weights == null)
     {
         throw new ArgumentNullException("weights");
     }
     _weights = weights;
 }
 /// <summary>
 /// Creates a new Weighted Optimiser which reads weights from the given RDF Graph
 /// </summary>
 /// <param name="g">Graph</param>
 public WeightedOptimiser(IGraph g)
 {
     _weights = new Weightings(g);
 }