Language/15_Types/4_Interface_Types_A10_t04.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 a type parameter and
 * S is a type parameter bound (S is function type with non-trivial return type and parameters).
 * Checks assignability (no static 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 {}

typedef Map<List, List<Map<num,List>>> complexFunction_t1();
typedef t1_1();
typedef Map<List<int>, List> t1_2();
typedef Map<List<int>, List<Map>> t1_3();
typedef Map<List<complexFunction_t1>, List<Map<int, List<Map<complexFunction_t1, complexFunction_t2>>>>> t1_4();

typedef complexFunction_t1 complexFunction_t2(complexFunction_t1 f1, complexFunction_t1 f2);
typedef t1_1 t2_1(t1_2 f1, t1_3 f2);
typedef t1_3 t2_2(t1_4 f1, t1_1 f2);

typedef K bound(J j, complexFunction_t1 f1, [num i, complexFunction_t2 f2]);
typedef C param1(K j, t1_1 f1, [int i, t2_1 f2]);
typedef K param2(C j, t1_4 f1, [double i, t2_2 f2]);
typedef I param3(J j, t1_2 f1, [double i, t2_2 f2]);
typedef param4(var x, var y, [var i, var f2]);
typedef J param5(I j, t1_1 f1, [Object i, t2_1 f2]);

class Checker<T extends bound> {
  Checker() {}
  
  Checker<bound> f() {}
  
  check() {
    Expect.isTrue(new Checker<T>() is Checker<bound>);
    Checker<bound> c1 = new Checker<T>();
    Checker<T> c2 = f();
  }
}

main() {
  new Checker().check();
  new Checker<param1>().check();
  new Checker<param2>().check();
  new Checker<param3>().check();
  new Checker<param4>().check();
  new Checker<param5>().check();
}