public ImmutableHashSet <T> Add(T item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
var operation = new SetAddOperation <T>(item);
var newRoot = _root.Modify(item.GetHashCode(), operation) ?? EmptyPatriciaTrie <T> .Instance;
return(newRoot == _root ? this : new ImmutableHashSet <T>(newRoot));
}
public ImmutableHashDictionary <TKey, TValue> Add(KeyValuePair <TKey, TValue> item)
{
if (item.Key == null)
{
throw ExceptionHelper.GetKeyCannotBeNullException("item");
}
var operation = new DictionaryAddOperation <TKey, TValue>(item);
var newRoot = _root.Modify(item.Key.GetHashCode(), operation);
if (newRoot == _root)
{
throw ExceptionHelper.GetKeyAlreadyExistsException(item.Key, "item");
}
return(new ImmutableHashDictionary <TKey, TValue>(newRoot));
}