internal static void AddValue <T>(ref ISet <T> references, T value)
{
if (references == null)
{
references = new SetOfOne <T>(value);
}
else if (references is SetOfOne <T> )
{
if (!references.Contains(value))
{
references = new SetOfTwo <T>(((SetOfOne <T>)references).Value, value);
}
}
else if (references is SetOfTwo <T> )
{
if (!references.Contains(value))
{
references = new HashSet <T>(references);
references.Add(value);
}
}
else
{
references.Add(value);
}
}
/// <summary>
/// Returns the union of the new two sets as a new set tracking whether
/// or not self is a locally created HashSet.
/// </summary>
public static ISet <Namespace> Union(this ISet <Namespace> self, ISet <Namespace> value, ref bool madeSet)
{
Namespace selfOne, valueOne;
if (self.Count == 0)
{
return(value);
}
else if (value.Count == 0)
{
return(self);
}
else if ((selfOne = self as Namespace) != null)
{
if ((valueOne = value as Namespace) != null)
{
if (object.ReferenceEquals(selfOne, valueOne))
{
return(selfOne);
}
var res = new SetOfTwo <Namespace>(selfOne, valueOne);
return(res);
}
else
{
var res = new HashSet <Namespace>(value);
res.Add(selfOne);
return(res);
}
}
else if ((valueOne = value as Namespace) != null)
{
var res = new HashSet <Namespace>(self);
res.Add(valueOne);
return(res);
}
if (!madeSet)
{
self = new HashSet <Namespace>(self);
madeSet = true;
}
self.UnionWith(value);
return(self);
}