public override int Compare(ImmutableHashSet <T> oldValue, ImmutableHashSet <T> newValue, bool assertMonotonicity)
{
Debug.Assert(oldValue != null);
Debug.Assert(newValue != null);
if (ReferenceEquals(oldValue, newValue))
{
return(0);
}
int result;
// PERF: Avoid additional hash set allocation by using overload which takes
// a set argument instead of IEnumerable argument.
var isSubset = oldValue.IsSubsetOfSet(newValue);
if (isSubset &&
oldValue.Count == newValue.Count)
{
// oldValue == newValue
result = 0;
}
else if (isSubset)
{
// oldValue < newValue
result = -1;
}
else
{
// oldValue > newValue
result = 1;
}
return(result);
}
