public static StringSet operator +(StringSet first, StringSet second)
{
var result = new StringSet();
CopyItems(first, result);
CopyItems(second, result);
return result;
}
public static StringSet operator -(StringSet first, StringSet second)
{
var result = new StringSet();
foreach (var item in first._items) {
if (second._items.Contains(item))
result.Add(item);
}
return result;
}
private static void CopyItems(StringSet source, StringSet destination)
{
foreach (var item in source._items) {
destination.Add(item);
}
}
public StringSet Union(StringSet second)
{
return this + second;
}
public StringSet Intersect(StringSet second)
{
return this - second;
}
