blob: a8a67e82ea051bda81973333698d0980052c5c48 [file] [log] [blame]
/*
* 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.
* @static-clean
* @author iefremov
* @reviewer rodionov
*/
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> {
Checker_Object() {}
Checker_Object<Object> f2() {}
check() {
Expect.isTrue(new Checker_Object<T>() is Checker_Object<Object>);
Checker_Object<Object> c1 = new Checker_Object<T>();
Checker_Object<T> 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();
}