Lasse R.H. Nielsen
5430e68680
Change-Id: I6d5e15ff2d432202618fbc490969a65a9181816d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/396281 Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com>
59 lines
2.1 KiB
Dart
59 lines
2.1 KiB
Dart
// Copyright (c) 2021, 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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// Checks that a const map can have a key which overrides `hashCode`.
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// Overriding `hashCode` in const map keys was made an error in Dart 3.0.
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// @dart=2.19
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import 'package:expect/expect.dart';
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/// Returns its argument.
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///
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/// Prevents static optimizations and inlining.
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@pragma('vm:never-inline')
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@pragma('dart2js:noInline')
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dynamic getValueNonOptimized(dynamic x) {
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// DateTime.now() cannot be predicted statically, never equal to 42.
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if (DateTime.now().millisecondsSinceEpoch == 42) {
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return getValueNonOptimized(2);
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}
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return x;
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}
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class MyClass {
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final int n;
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const MyClass(this.n);
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int get hashCode => super.hashCode + 1;
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}
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main() {
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const constInstance = MyClass(1);
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final nonConstInstance = MyClass(1);
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const constMap = {MyClass(1): 11};
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final nonConstMap = {constInstance: 11};
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final nonConstMap2 = {nonConstInstance: 11};
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// operator== is _not_ overridden, so instances are not equal.
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Expect.notEquals(constInstance, nonConstInstance);
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Expect.isTrue(constMap.containsKey(getValueNonOptimized(constInstance)));
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Expect.isFalse(constMap.containsKey(getValueNonOptimized(nonConstInstance)));
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Expect.isTrue(nonConstMap.containsKey(getValueNonOptimized(constInstance)));
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Expect.isFalse(
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nonConstMap.containsKey(getValueNonOptimized(nonConstInstance)));
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Expect.isFalse(nonConstMap2.containsKey(getValueNonOptimized(constInstance)));
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Expect.isTrue(
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nonConstMap2.containsKey(getValueNonOptimized(nonConstInstance)));
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Expect.equals(11, constMap[getValueNonOptimized(constInstance)]);
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Expect.isNull(constMap[getValueNonOptimized(nonConstInstance)]);
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Expect.equals(11, nonConstMap[getValueNonOptimized(constInstance)]);
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Expect.isNull(nonConstMap[getValueNonOptimized(nonConstInstance)]);
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Expect.isNull(nonConstMap2[getValueNonOptimized(constInstance)]);
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Expect.equals(11, nonConstMap2[getValueNonOptimized(nonConstInstance)]);
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}
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