| /* |
| * Copyright (c) 2011, 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 A type T is more specific than a type S, written T << S, if T is S. |
| * << is a partial order on types. T is a subtype of S, written T <: S, iff [⊥/Dynamic]T << S. |
| * A type T may be assigned to a type S, written T <=> S, if either T <: S or S <: T. |
| * @description Checks that a generic type T with several type parameters is a subtype of itself and |
| * T is assignable to itself. |
| * @author iefremov |
| * @reviewer rodionov |
| */ |
| import "../../Utils/expect.dart"; |
| |
| class A<T, S, U> { |
| } |
| |
| main() { |
| //trivial check |
| A a = new A(); |
| Expect.isTrue(a is A); |
| A b = a; |
| a = new A(); |
| Expect.isFalse(identical(a, b)); |
| |
| //check with type parameters |
| A<int, double, A> n = new A<int, double, A>(); |
| Expect.isTrue(a is A<int, double, A>); |
| Expect.isTrue(n is A); |
| |
| a = n; |
| n = new A(); |
| |
| //type parameters are also generic |
| a = new A(); |
| A<A<A, int, double>, List<String>, A> n2 = new A<A<A, int, double>, List<String>, A>(); |
| Expect.isTrue(a is A<A<A, int, double>, List<String>, A>); |
| Expect.isTrue(n2 is A); |
| |
| a = n2; |
| n2 = new A(); |
| |
| Map m = new Map(); |
| Expect.isTrue(m is Map); |
| Map m2 = m; |
| m = new Map(); |
| |
| Map<int, Object> mio = new Map<int, Object>(); |
| Expect.isTrue(mio is Map<int, Object>); |
| Map<int, Object> mio2 = mio; |
| mio = new Map<int, Object>(); |
| } |