Language/Types/Function_Types/subtype_optional_args_t02.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 function type (T1,...Tk,[Tk+1,...,Tn+m]) -> T is a subtype of
 * the function type (S1,...,Sk+j,[Sk+j+1,...,Sn]) -> S, if all of the following
 * conditions are met:
 * 1. Either
 *    • S is void, or
 *    • T <=> S.
 * 2. ∀i ∈ 1..n, Ti ⇐⇒ Si.
 * @description Checks that this statement is true for functions with several
 * positional optional parameters (class, generic, function, Dynamic).
 * @author iefremov
 * @reviewer rodionov
 * @reviewer iefremov
 */
import "../../../Utils/expect.dart";

class A {}
class A1 {}
class A2 {}
class B implements A, A1, A2 {}
class C implements B {}
class D implements C {}

class G<T, S, U, W> {}

typedef classesFunc([A a, B b, C c, D d]);
typedef genericsFunc([Map<num, int> m, List<List<B>> l, G<A, B, C, D> g]);
typedef dynamicFunc([var x, var y, var z, var v]);
typedef funcFunc([classesFunc f1, genericsFunc f2, dynamicFunc f3]);
typedef mixFunc([var x, B b, G<A, B, C, D> g, funcFunc f]);

typedef okWithClassesFunc_1([A a, A1 b, A1 c, A1 d]);
typedef okWithClassesFunc_2([D a, D b, D c, D d]);

typedef okWithGenericsFunc_1([Map<num, num> m, List<List<A1>> l, G<A, A1, A1, A1> g]);
typedef okWithGenericsFunc_2([Map<int, int> m, List<List<D>> l, G<D, D, D, D> g]);

typedef okWithDynamicFunc_1([A x, G y, mixFunc z, var v]);
typedef okWithDynamicFunc_2([int x, bool y, List<Map> z, classesFunc v]);


main() {
  Expect.isTrue(([D a, B b, C c, A d]) {} is classesFunc);
  Expect.isTrue(([A a, A b, A c, A d]) {} is classesFunc);
  Expect.isTrue(([D a, A1 b, A1 c, A1 d]) {} is classesFunc);
  Expect.isTrue(([D a, A2 b, A2 c, A2 d]) {} is classesFunc);
  Expect.isTrue(([D a, D b, D c, D d]) {} is classesFunc);
  Expect.isTrue(([var a, var b, var c, var d]) {} is classesFunc);
  Expect.isTrue(([Object a, Object b, Object c, Object d]) {} is classesFunc);

  Expect.isTrue(([Map<num, num> m, List<List<A1>> l, G<A, A1, A1, A1> g]) {} is genericsFunc);
  Expect.isTrue(([Map<int, int> m, List<List<D>> l, G<D, D, D, D> g]) {} is genericsFunc);
  Expect.isTrue(([var m, var l, var g]) {} is genericsFunc);
  Expect.isTrue(([Object m, Object l, Object g]) {} is genericsFunc);

  Expect.isTrue(([A x, G y, mixFunc z, var v]) {} is dynamicFunc);
  Expect.isTrue(([int x, bool y, List<Map> z, classesFunc v]) {} is dynamicFunc);

  Expect.isTrue(([okWithClassesFunc_1 f1, okWithGenericsFunc_1 f2, okWithDynamicFunc_1 f3]) {} is funcFunc);
  Expect.isTrue(([okWithClassesFunc_2 f1, okWithGenericsFunc_2 f2, okWithDynamicFunc_2 f3]) {} is funcFunc);
}