Language/15_Types/4_Interface_Types_A10_t01.dart

/*
 * 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 of the form I<T1, ..., Tn> and
 * S is of the form I<S1, ..., Sn> and: Ti << Si , 1 <= i <= n
 * << 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 GenericType<T> is a subtype of GenericType<S> where T is subtype of S
 * (T and S are non-generic interfaces and/or Dynamic).
 * @author iefremov
 * @reviewer rodionov
 */
import "../../Utils/expect.dart";

class I {}
class J implements I {}
class K implements J {}

class Z<T> {
  Z() {}
}

main() {
  Expect.isTrue(new List<String>() is List);
  Expect.isTrue(new List() is List<String>);
  Expect.isTrue(new List<String>() is List<Object>);
  Expect.isTrue(new List<String>() is List<Object>);
  Expect.isTrue(new List<int>() is List<num>);
  Expect.isTrue(new List<int>() is List);
  Expect.isTrue(new List<int>() is List<Object>);
  Expect.isTrue(new List<double>() is List<Object>);
  Expect.isTrue(new List<double>() is List);
  Expect.isTrue(new List<double>() is List<num>);
  Expect.isTrue(new List<J>() is List);
  Expect.isTrue(new List<J>() is List<Object>);
  Expect.isTrue(new List<J>() is List<I>);
  Expect.isTrue(new List<K>() is List<I>);
  Expect.isTrue(new List<K>() is List<J>);

  Expect.isTrue(new Z<String>() is Z);
  Expect.isTrue(new Z() is Z<String>);
  Expect.isTrue(new Z<String>() is Z<Object>);
  Expect.isTrue(new Z<String>() is Z<Object>);
  Expect.isTrue(new Z<int>() is Z<num>);
  Expect.isTrue(new Z<int>() is Z);
  Expect.isTrue(new Z<int>() is Z<Object>);
  Expect.isTrue(new Z<double>() is Z<Object>);
  Expect.isTrue(new Z<double>() is Z);
  Expect.isTrue(new Z<double>() is Z<num>);
  Expect.isTrue(new Z<J>() is Z);
  Expect.isTrue(new Z<J>() is Z<Object>);
  Expect.isTrue(new Z<J>() is Z<I>);
  Expect.isTrue(new Z<K>() is Z<I>);
  Expect.isTrue(new Z<K>() is Z<J>);
}