regis@google.com
02a8df0c83
Patch List and Map (implementation) classes with literal factories. Review URL: https://codereview.chromium.org//11369234 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@14873 260f80e4-7a28-3924-810f-c04153c831b5
36 lines
1.1 KiB
Dart
36 lines
1.1 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Note that the optimizing compiler depends on the algorithm which
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// returns a _GrowableObjectArray if length is null, otherwise returns
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// fixed size array.
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patch class _ListImpl<E> {
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/* patch */ factory List([int length = null]) {
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if (length == null) {
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return new _GrowableObjectArray<E>();
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} else {
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return new _ObjectArray<E>(length);
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}
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}
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/* patch */ factory List.from(Iterable<E> other) {
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_GrowableObjectArray<E> list = new _GrowableObjectArray<E>();
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for (final e in other) {
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list.add(e);
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}
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return list;
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}
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// Factory constructing a mutable List from a parser generated List literal.
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// [elements] contains elements that are already type checked.
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factory List._fromLiteral(List elements) {
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var list = new List<E>();
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if (elements.length > 0) {
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list._setData(elements);
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list.length = elements.length;
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}
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return list;
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}
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}
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