| // 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 Trivial checks that GenericType<T> is a subtype of |
| /// GenericType<S> where T is a type parameter and S is a type parameter bound. |
| /// Checks their mutual assignability (no static type warnings) as well. |
| /// @author iefremov |
| |
| import "../../../Utils/expect.dart"; |
| |
| class I {} |
| class J extends I {} |
| class K extends J {} |
| class C implements K {} |
| |
| class Checker_I<T extends I> implements I { |
| Checker_I() {} |
| |
| check() { |
| Expect.isTrue(new Checker_I<T>() is Checker_I<I>); |
| Checker_I<I> c1 = new Checker_I<T>(); |
| } |
| } |
| |
| class Checker_Object<T extends Object> { |
| Checker_Object() {} |
| |
| Checker_Object<Object>? f2() {} |
| |
| check() { |
| Expect.isTrue(new Checker_Object<T>() is Checker_Object<Object>); |
| Expect.runtimeIsType<Checker_Object<Object>>(new Checker_Object<T>()); |
| Checker_Object<Object> c1 = new Checker_Object<T>(); |
| Checker_Object<Object>? c2 = f2(); |
| } |
| } |
| |
| main() { |
| new Checker_I().check(); |
| new Checker_I<Checker_I>().check(); |
| new Checker_I<I>().check(); |
| new Checker_I<J>().check(); |
| new Checker_I<K>().check(); |
| new Checker_I<C>().check(); |
| |
| new Checker_Object().check(); |
| new Checker_Object<Checker_Object>().check(); |
| new Checker_Object<Checker_I>().check(); |
| new Checker_Object<I>().check(); |
| new Checker_Object<J>().check(); |
| new Checker_Object<K>().check(); |
| new Checker_Object<C>().check(); |
| } |