30 lines
1.1 KiB
C#
30 lines
1.1 KiB
C#
//namespace Immutable {
|
|
using System;
|
|
using System.Collections.Generic;
|
|
|
|
public class DefaultDictionary<TKey, TValue> : ImmutableDictionary<TKey, TValue> {
|
|
public readonly TValue defaultValue;
|
|
|
|
public DefaultDictionary(TValue defaultValue, ImmutableDictionary<TKey, TValue> dictionary) : base(dictionary) {
|
|
this.defaultValue = defaultValue;
|
|
}
|
|
|
|
public DefaultDictionary(DefaultDictionary<TKey, TValue> dictionary, TKey key, TValue value) : base(dictionary, key, value) {
|
|
this.defaultValue = dictionary.defaultValue;
|
|
}
|
|
|
|
public new TValue this[TKey key] {
|
|
get {
|
|
return this.GetOrDefault(key, defaultValue);
|
|
}
|
|
}
|
|
|
|
public new DefaultDictionary<TKey, TValue> With(TKey key, TValue value)
|
|
=> new DefaultDictionary<TKey, TValue>(this, key, value);
|
|
}
|
|
|
|
public static class DefaultDictionaryExtensionMethods {
|
|
public static DefaultDictionary<UKey, UValue> ToDefaultDictionary<T, UKey, UValue>(this IEnumerable<T> e, UValue defaultValue, Func<T, UKey> key, Func<T, UValue> value)
|
|
=> new DefaultDictionary<UKey, UValue>(defaultValue, e.ToImmutableDictionary(key, value));
|
|
}
|
|
//} |