| /* |
| * 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 one |
| * of the following conditions is met: |
| * • T is S. |
| * • T is ⊥ |
| * • S is dynamic. |
| * • S is a direct supertype of T. |
| * • T is a type parameter and S is the upper bound of T. |
| * • T is a type parameter and S is Object. |
| * • T is of the form I<T1, ..., Tn > and S is of the form I <S1, ..., Sn> |
| * and Ti << Si 1 <= i <= n. |
| * • T and S are both function types, and T << S under the rules of section |
| * (Types/Function Types). |
| * • T is a function type and S is Function. |
| * • T << U and U << S. |
| * << is a partial order on types. T is a subtype of S, written T <: S, iff |
| * [⊥/Dynamic]T << S. |
| * . . . |
| * An interface 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 a single type parameter is a |
| * subtype of itself and T is assignable to itself. |
| * @author iefremov |
| */ |
| import "../../../Utils/expect.dart"; |
| |
| class A<T> { |
| } |
| |
| main() { |
| A a = new A(); |
| Expect.isTrue(a is A); |
| A b = a; |
| a = new A(); |
| Expect.isFalse(identical(a, b)); |
| |
| A<int> n = new A<int>(); |
| Expect.isTrue(n is A<int>); |
| Expect.isTrue(a is A); |
| |
| a = n; |
| n = new A(); |
| |
| List l1 = new List.empty(); |
| Expect.isTrue(l1 is List); |
| List l2 = l1; |
| l1 = new List.empty(); |
| |
| List<int> li1 = new List<int>.empty(); |
| Expect.isTrue(li1 is List<int>); |
| List li2 = li1; |
| li1 = new List<int>.empty(); |
| |
| List<List<List>> ll1 = new List<List<List>>.empty(); |
| Expect.isTrue(ll1 is List<List<List>>); |
| List ll2 = ll1; |
| ll1 = new List<List<List>>.empty(); |
| |
| A<Map<List, List<Map<Object, Map>>>> z = new A<Map<List, List<Map<Object, Map>>>>(); |
| Expect.isTrue(z is A<Map<List, List<Map<Object, Map>>>>); |
| A<Map<List, List<Map<Object, Map>>>> z2 = z; |
| z = new A<Map<List, List<Map<Object, Map>>>>(); |
| } |