public ISimpleSet <T> Union(ISimpleSet <T> other)
{
var set = new SimpleHashSet <T>();
foreach (var item in this.Concat(other))
{
set.Add(item);
}
return(set);
}
public ISimpleSet <T> Diff(ISimpleSet <T> other)
{
var set = new SimpleHashSet <T>();
foreach (var item in this)
{
if (!other.Contains(item))
{
set.Add(item);
}
}
return(set);
}