//IMPORTANT: this part uses the fact that GetHashCode() is consistent with the notion of equality in the set
public int GetHashCode(ObservableSortedSet <T> obj)
{
int hashCode = 0;
foreach (T t in obj)
{
hashCode ^= EqualityComparer.GetHashCode(t) & 0x7FFFFFFF;
}
return(hashCode);
}
// using comparer to keep equals properties in tact; don't want to choose one of the comparers
public bool Equals(ObservableSortedSet <T> x, ObservableSortedSet <T> y)
{
return(ObservableSortedSet <T> .SetEquals(x, y, Comparer));
}