TEdge IImplicitGraph <TVertex, TEdge> .OutEdge(TVertex v, int index)
{
IImplicitGraph <TVertex, TEdge> ithis = this;
Contract.Requires(v != null);
Contract.Requires(ithis.ContainsVertex(v));
Contract.Ensures(Enumerable.Any(ithis.OutEdges(v), e => e.Equals(Contract.Result <TEdge>())));
return(default(TEdge));
}
int IImplicitGraph <TVertex, TEdge> .OutDegree(TVertex v)
{
IImplicitGraph <TVertex, TEdge> ithis = this;
Contract.Requires(v != null);
Contract.Requires(ithis.ContainsVertex(v));
Contract.Ensures(Contract.Result <int>() == Enumerable.Count <TEdge>(ithis.OutEdges(v)));
return(default(int));
}
bool IImplicitGraph <TVertex, TEdge> .IsOutEdgesEmpty(TVertex v)
{
IImplicitGraph <TVertex, TEdge> ithis = this;
Contract.Requires(v != null);
Contract.Requires(ithis.ContainsVertex(v));
Contract.Ensures(Contract.Result <bool>() == (ithis.OutDegree(v) == 0));
return(default(bool));
}
IEnumerable <TEdge> IImplicitGraph <TVertex, TEdge> .OutEdges(TVertex v)
{
IImplicitGraph <TVertex, TEdge> ithis = this;
Contract.Requires(v != null);
Contract.Requires(ithis.ContainsVertex(v));
Contract.Ensures(Contract.Result <IEnumerable <TEdge> >() != null);
Contract.Ensures(Enumerable.All(Contract.Result <IEnumerable <TEdge> >(), e => e.Source.Equals(v)));
return(default(IEnumerable <TEdge>));
}
TEdge IImplicitGraph <TVertex, TEdge> .OutEdge(TVertex v, int index)
{
IImplicitGraph <TVertex, TEdge> ithis = this;
Contract.Requires(v != null);
Contract.Requires(ithis.ContainsVertex(v));
Contract.Requires(index >= 0 && index < ithis.OutDegree(v));
Contract.Ensures(
Enumerable.ElementAt(ithis.OutEdges(v), index).Equals(Contract.Result <TEdge>()));
return(default(TEdge));
}
public bool ContainsVertex(Vertex vertex)
{
return(_impl.ContainsVertex(vertex));
}