ImmMap <TKey, TValue> Subtract <TValue2>(ImmMap <TKey, TValue2> other,
ValueSelector <TKey, TValue, TValue2, Optional <TValue> > subtraction = null)
{
other.CheckNotNull("other");
return(_root.Except(other._root, Lineage.Mutable(), subtraction).WrapMap(_equality));
}
protected override ImmMap <TKey, TValue> Join(ImmMap <TKey, TValue> other,
ValueSelector <TKey, TValue, TValue, TValue> collision = null)
{
return(_root.Intersect(other._root, Lineage.Mutable(), collision).WrapMap(_equality));
}
/// <summary>
/// Returns an empty ImmMap that uses the specified equality comparer to equate elements.
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="eq">Optionally, the equality comparer used to equate keys. Otherwise, the default equality comparer is used.</param>
/// <returns></returns>
public static ImmMap <TKey, TValue> Empty <TKey, TValue>(IEqualityComparer <TKey> eq = null)
{
return(ImmMap <TKey, TValue> .Empty(eq ?? FastEquality <TKey> .Default));
}
/// <summary>
/// Converts the specified sequence of key-value pairs to a ImmMap, using the optionally specified equality comparer for determining equality between keys.
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="kvps">A sequence of key-value pairs.</param>
/// <param name="eq">An equality comparer</param>
/// <returns></returns>
public static ImmMap <TKey, TValue> ToImmMap <TKey, TValue>(this IEnumerable <KeyValuePair <TKey, TValue> > kvps,
IEqualityComparer <TKey> eq = null)
{
return(ImmMap <TKey, TValue> .Empty(eq).AddRange(kvps));
}
/// <summary>
/// Uses the specified IEqualityComparer as a factory, producing an empty ImmMap using that comparer.
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="eq"></param>
/// <returns></returns>
public static ImmMap <TKey, TValue> CreateMap <TKey, TValue>(this IEqualityComparer <TKey> eq)
{
return(ImmMap <TKey, TValue> .Empty(eq));
}