| // 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 GenericType<T> is a subtype of GenericType<S> where |
| /// T and S are simple functions. |
| /// @author iefremov |
| |
| import "../../../Utils/expect.dart"; |
| |
| class I0 {} |
| class I1 extends I0 {} |
| class I2 extends I1 {} |
| class I3 extends I2 {} |
| class I4 extends I2 {} |
| |
| class G<T> {} |
| |
| typedef t1(); |
| typedef void t1_1(); // void <: Dynamic |
| typedef G<List<t1>> t1_2(); |
| |
| typedef I2 t2(I2 i, [I2 j]); |
| typedef I0 t2_1(I0 i, [I0 j]); |
| typedef I4 t2_2(I4 i, [I4 j]); |
| typedef I4 t2_3(I0 i, [I4 j]); |
| typedef I0 t2_4(I4 i, [I0 j]); |
| |
| typedef t1 t3(t1 f1, [t1 f2]); |
| typedef t1_1 t3_1(t1_1 f1, [t1_1 f2]); |
| typedef t1_2 t3_2(t1_2 f1, [t1_2 f2]); |
| |
| main() { |
| Expect.isTrue(new List<t1>.empty() is List<t1>); |
| Expect.isTrue(new List<t1_1>.empty() is List<t1>); |
| Expect.isTrue(new List<t1_2>.empty() is List<t1>); |
| |
| Expect.isTrue(new List<t2>.empty() is List<t2>); |
| Expect.isFalse(new List<t2_1>.empty() is List<t2>); |
| Expect.isFalse(new List<t2_2>.empty() is List<t2>); |
| Expect.isFalse(new List<t2_3>.empty() is List<t2>); |
| Expect.isFalse(new List<t2_4>.empty() is List<t2>); |
| |
| Expect.isTrue(new List<t3>.empty() is List<t3>); |
| Expect.isTrue(new List<t3_1>.empty() is List<t3>); |
| Expect.isFalse(new List<t3_2>.empty() is List<t3>); |
| } |