/// <inheritdoc cref="ImmutableHashSet{T}.Builder.ExceptWith(IEnumerable{T})"/>
public void ExceptWith(IEnumerable <T> other)
{
if (other is null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.other);
}
if (_mutableSet is not null)
{
_mutableSet.ExceptWith(other);
return;
}
if (other == this)
{
Clear();
return;
}
else if (other is ImmutableSegmentedHashSet <T> otherSet)
{
if (otherSet == _set)
{
Clear();
return;
}
else if (otherSet.IsEmpty)
{
// No action required
return;
}
else
{
GetOrCreateMutableSet().ExceptWith(otherSet._set);
return;
}
}
else
{
// Manually enumerate to avoid changes to the builder if 'other' is empty or does not contain any
// items present in the current set.
SegmentedHashSet <T>?mutableSet = null;
foreach (var item in other)
{
if (mutableSet is null)
{
if (!ReadOnlySet.Contains(item))
{
continue;
}
mutableSet = GetOrCreateMutableSet();
}
mutableSet.Remove(item);
}
return;
}
}