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// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion UnmodifiableMapBase<K, V>
/// Basic implementation of an unmodifiable [Map].
/// This class has a basic implementation of all but two of the members of an
/// umodifiable [Map]. A simple unmodifiable [Map] class can be implemented by
/// extending this class and implementing [keys] and operator[].
/// @description Implementation of [simple UnmodifiableMapBase]
/// @author
library unmodifiable_map_base_lib;
import "dart:collection";
class UnmodifiableMapBaseImpl<K, V> extends UnmodifiableMapBase<K, V> {
LinkedHashMap<K, V> _map;
UnmodifiableMapBaseImpl(Map content): _map =
new LinkedHashMap<K, V>.from(content);
Iterable<K> get keys => _map.keys;
V? operator [](Object? key) => _map[key];