public HSetInternal <T> Subtract(HSetInternal <T> rhs)
{
var self = this;
foreach (var item in rhs)
{
self = self.Remove(item);
}
return(self);
}
public HSetInternal <T> Append(HSetInternal <T> rhs)
{
var self = this;
foreach (var item in rhs)
{
if (!self.Contains(item))
{
self = self.Add(item);
}
}
return(self);
}
public bool IsSubsetOf(IEnumerable <T> other)
{
if (IsEmpty)
{
return(true);
}
var otherSet = new HSetInternal <T>(other);
int matches = 0;
foreach (var item in otherSet)
{
if (Contains(item))
{
matches++;
}
}
return(matches == Count);
}
internal HSetInternal(IEnumerable <T> items, bool checkUniqueness = false)
{
var set = new HSetInternal <T>();
if (checkUniqueness)
{
foreach (var item in items)
{
set = set.TryAdd(item);
}
}
else
{
foreach (var item in items)
{
set = set.Add(item);
}
}
}
public bool Equals(HSetInternal <T> other)
{
if (other == null || Count != other.Count)
{
return(false);
}
var iterx = GetEnumerator();
var itery = other.GetEnumerator();
var eq = EqualityComparer <T> .Default;
for (int i = 0; i < count; i++)
{
iterx.MoveNext();
itery.MoveNext();
if (!eq.Equals(iterx.Current, itery.Current))
{
return(false);
}
}
return(true);
}
public bool IsProperSubsetOf(IEnumerable <T> other)
{
if (IsEmpty)
{
return(other.Any());
}
var otherSet = new HSetInternal <T>(other);
if (Count >= otherSet.Count)
{
return(false);
}
int matches = 0;
bool extraFound = false;
foreach (var item in otherSet)
{
if (Contains(item))
{
matches++;
}
else
{
extraFound = true;
}
if (matches == Count && extraFound)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Ctor that takes an initial (distinct) set of items
/// </summary>
/// <param name="items"></param>
internal HSet(IEnumerable <T> items, bool checkUniqueness = false)
{
value = new HSetInternal <T>(items, checkUniqueness);
}
static HSet <U> Wrap <U>(HSetInternal <U> value) => new HSet <U>(value);
HSet <T> Wrap(HSetInternal <T> value) => new HSet <T>(value);
internal HSet(HSetInternal <T> value)
{
this.value = value;
}