blob: c9856ef3071a930120bed220afc123af1e062309 [file] [log] [blame]
// 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 SplayTreeMap([int compare(K key1, K key2),
/// bool isValidKey(potentialKey)])
/// ...
/// Keys of the map are compared using the compare function passed in the
/// constructor, both for ordering and for equality.
/// If the [compare] function is omitted, the objects are assumed to be
/// [Comparable], and are compared using their [Comparable.compareTo] method.
/// Non-comparable objects (including [null]) will not work as keys in that case.
/// @description Checks that if compare function is not specified then key object
/// should implement comparable.
/// @author
import "dart:collection";
import "../../../Utils/expect.dart";
class C implements Comparable {
int value;
compareTo(Object? other) {
return this.value - (other as C).value;
main() {
SplayTreeMap map = new SplayTreeMap();
C c1 = new C(2);
C c2 = new C(1);
map[c1] = 1;
map[c2] = 2;
Expect.equals(c2, map.firstKey());
Expect.equals(c1, map.lastKey());