public bool MultiSetEquals(IEnumerable <T> other)
{
var multiset = new MultiSet <T>(other);
foreach (T el in elements.Keys)
{
if (!multiset.Contains(el) || multiset[el] != this[el])
{
return(false);
}
}
return(true);
}
public MultiSet <T> ExceptWith(IEnumerable <T> other)
{
if (other is null)
{
throw new ArgumentNullException();
}
ThrowExceptionIfReadOnly();
var multiset = new MultiSet <T>(other);
var enumerator = multiset.GetEnumerator();
while (enumerator.MoveNext())
{
Remove(enumerator.Current, multiset[enumerator.Current]);
}
return(this);
}
public bool IsSupersetOf(IEnumerable <T> other)
{
if (other is null)
{
throw new ArgumentNullException();
}
var multiset = new MultiSet <T>(other);
var enumerator = multiset.GetEnumerator();
while (enumerator.MoveNext())
{
if (!Contains(enumerator.Current) || multiset[enumerator.Current] > this[enumerator.Current])
{
return(false);
}
}
return(true);
}
public static MultiSet <T> operator +(MultiSet <T> first, MultiSet <T> second)
{
if (first is null || second is null)
{
throw new ArgumentNullException();
}
var multiset = new MultiSet <T>();
var firstEnumerator = first.GetEnumerator();
var secondEnumerator = second.GetEnumerator();
while (firstEnumerator.MoveNext())
{
multiset.Add(firstEnumerator.Current, first[firstEnumerator.Current]);
}
while (secondEnumerator.MoveNext())
{
multiset.Add(secondEnumerator.Current, second[secondEnumerator.Current]);
}
return(multiset);
}