Robert Nystrom
fc1b1ecc71
Change-Id: Idbcc965a27e9ffeedf5e0a1068b019de4193070f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127745 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
39 lines
1.5 KiB
Dart
39 lines
1.5 KiB
Dart
// Copyright (c) 2014, 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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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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getValueNonOptimized(x) {
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// DateTime.now() cannot be predicted statically, never equal to ASCII 42 '*'.
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if (new DateTime.now() == 42) return getValueNonOptimized(2);
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return x;
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}
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main() {
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// TODO(terry): Should check:
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// - const map is immutable
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// - simple expressions are const e.g., 2 + 3, true && !false, etc.
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// - const with final and/or static with same const attributes
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// Additionally new class instances with a static const same identity
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// - const for all types (int, num, double, String, boolean, and objects)
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// - canonicalization - const created only once same identity e.g.,
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//
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// getConstMap() => const [1, 2];
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// var a = getConstMap();
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// var b = getConstMap();
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// Expect.equals(a.hashCode, b.hashCode);
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// Make sure that const maps use the == operator and not object identity. The
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// specification does not explicitly require it, otherwise ints and Strings
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// wouldn't make much sense as keys.
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var m = const {1: 42, "foo": 499, 2: "bar"};
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Expect.equals(42, m[getValueNonOptimized(1.0)]);
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Expect.equals(
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499, m[getValueNonOptimized(new String.fromCharCodes("foo".runes))]);
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Expect.equals('bar', m[getValueNonOptimized(2)]);
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}
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