blob: 7531b2aa38939200f7314654419f8e3017cbf083 [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 bool operator ==(Object other)
/// Test whether another object is equal to this function.
/// System-created function objects are only equal to other functions.
/// Two function objects are known to represent the same function if
/// - It is the same object. Static and top-level functions are compile time
/// constants when used as values, so referring to the same function twice
/// always give the same object,
/// - or if they refer to the same member method extracted from the same object.
/// Extracting a member method as a function value twice gives equal, but not
/// necessarily identical, function values.
/// Function expressions never give rise to equal function objects. Each time a
/// function expression is evaluated, it creates a new closure value that is not
/// known to be equal to other closures created by the same expression.
/// Classes implementing Function by having a call method should have their own
/// operator== and hashCode depending on the object.
/// @description Checks that equality operator works as expected.
/// @author
/// @issue 42895
import "../../../Utils/expect.dart";
class C {
m() {
String foo(x1, y1, {x2 : "x2", y2}) {
return "$x1$y1$x2$y2";
String bar(x1, y1, {x2 : "x2", y2}) {
return "$x1$y1$x2$y2";
main() {
Function f1 = foo;
Function f2 = foo;
Function b1 = bar;
Function b2 = bar;
Expect.isTrue(f1 == f2);
Expect.isTrue(b1 == b2);
Expect.isFalse(f1 == b1);
Function m1 = new C().m;
Function m2 = new C().m;
Expect.isFalse(m1 == m2);