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// Copyright (c) 2016, 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 ListBase<E> class
/// Implements ListMixin<E>
/// Abstract implementation of a list.
/// All operations are defined in terms of length, operator[], operator[]= and
/// length=, which need to be implemented.
/// @description Implementation of length, operator[], operator[]= and length=
/// @author
library list_base_lib;
import "dart:collection";
class ListBaseImpl<E> extends ListBase<E> {
List<E> _list;
ListBaseImpl.empty(): _list = new List<E>.empty(growable: true);
ListBaseImpl(int length, E fill): _list = new List.filled(length, fill);
E operator [](int index) => _list[index];
void operator []=(int index, E value) {
_list[index] = value;
int get length => _list.length;
void set length(int newLength) {
_list.length = newLength;
ListBase<E> create<E>([int? length, E? fill]) {
if (length == null) {
return new ListBaseImpl<E>.empty();
if (fill != null) {
return new ListBaseImpl(length, fill);
throw new Exception("List length specified but fill is null");