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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 // Test that static members cannot be overridden (static type warning only). | 5 // Test the semantics of static members mixed with instance members. |
| 6 | 6 |
| 7 m() {} | 7 // Following are relevant quotes from Dart Programming Language |
| 8 // Specification, Draft Version 0.10, June 7, 2012. | |
| 9 | |
| 10 // 7 Classes: | |
| 11 | |
| 12 // "It is a compile-time error if a class has an instance method and a | |
| 13 // static member method with the same name." | |
| 14 | |
| 15 // 7.1 Instance Methods: | |
| 16 | |
| 17 // "Instance methods are functions (6) whose declarations are | |
| 18 // immediately contained within a class declaration and that are not | |
| 19 // declared static. The instance methods of a class C are those | |
| 20 // instance methods declared by C and the instance methods inherited | |
| 21 // by C from its superclass." | |
| 22 | |
| 23 | |
| 24 // 7.6 Static Methods | |
| 25 | |
| 26 // "Static methods are functions whose declarations are immediately | |
| 27 // contained within a class declaration and that are declared | |
| 28 // static. The static methods of a class C are those static methods | |
| 29 // declared by C." | |
| 30 | |
| 31 // 7.7 Static Variables | |
| 32 | |
| 33 // "Static variables are variables whose declarations are immediately | |
| 34 // contained within a class declaration and that are declared | |
| 35 // static. The static variables of a class C are those static | |
| 36 // variables declared by C." | |
| 37 | |
| 38 // "A static variable declaration of one of the forms static T v;, | |
| 39 // static T v = e; , static const T v = e; or static final T v = e; | |
| 40 // always induces an implicit static getter function (7.2) with | |
| 41 // signature static T get v() whose invocation evaluates as described | |
| 42 // below (7.7.1)." | |
| 43 | |
| 44 m() => 'top level'; | |
| 8 | 45 |
| 9 class Super { | 46 class Super { |
| 10 Super() {} | |
| 11 // No error from hiding. | 47 // No error from hiding. |
| 12 static m() {} | 48 static m() => 'super'; |
| 13 | 49 |
| 14 static var i; | 50 static var i = 'super'; |
| 15 | 51 |
| 16 instanceMethod() {} | 52 instanceMethod() => m(); |
| 53 | |
| 54 instanceMethod2() => m(); | |
| 17 } | 55 } |
| 18 | 56 |
| 19 class Sub extends Super { | 57 class Sub extends Super { |
| 20 Sub() : super(); | 58 // According to 7.6, static methods are not inherited. |
| 21 static m() {} /// 01: static type warning | 59 static m() => 'sub'; |
| 22 | 60 |
| 23 static var i; /// 02: static type warning | 61 // According to 7.7, static variables are not inherited. |
| 62 static var i = 'sub'; | |
| 24 | 63 |
| 25 static instanceMethod() {} /// 03: compile-time error | 64 // According to 7.1, instance methods include those of the |
| 65 // superclass, and according to 7, it is a compile-time to have an | |
| 66 // instance method and static method with the same name. | |
| 67 static /// 03: compile-time error | |
| 68 instanceMethod() => m(); | |
| 26 | 69 |
| 27 static i() {} /// 04: static type warning | 70 // According to 7.7, static variables are not inherited. |
| 71 static i() => m(); | |
|
kasperl
2012/06/20 08:58:32
So you can have a static method called i and a sta
ahe
2012/06/20 09:04:40
No. Static members are not inherited.
zundel
2012/06/20 09:08:57
Its the lesser of evils maybe. Unqualified access
ahe
2012/06/20 11:00:18
Actually, after removing the "compile-time error"
| |
| 28 | 72 |
| 29 static var instanceMethod; /// 05: compile-time error | 73 // According to 7.1, instance methods include those of the |
| 74 // superclass, and according to 7, it is a compile-time to have an | |
| 75 // instance method and static method with the same | |
| 76 // name. Furthermore, according to 7.7 a static variable induces an | |
| 77 // implicit getter function (a static method). | |
| 78 static var instanceMethod2; /// 05: compile-time error | |
| 30 | 79 |
| 31 foo() {} | 80 foo() => 'foo'; |
| 32 } | 81 } |
| 33 | 82 |
| 34 main() { | 83 main() { |
| 35 new Sub().foo(); | 84 Expect.equals('foo', new Sub().foo()); |
| 85 Expect.equals('top level', m()); | |
| 86 Expect.equals('super', Super.m()); | |
| 87 Expect.equals('sub', Sub.m()); | |
| 88 Expect.equals('super', Super.i); | |
| 89 Expect.equals('sub', Sub.i()); | |
| 90 Expect.equals('super', new Super().instanceMethod()); | |
| 91 Expect.equals('sub', new Sub().instanceMethod()); | |
| 92 Expect.equals('super', new Super().instanceMethod2()); | |
| 93 Expect.equals('super', new Sub().instanceMethod2()); | |
| 36 } | 94 } |
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