Language/Interfaces/Superinterfaces/Inheritance_and_Overriding/inheritance_t06.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 We define inherited(J, K) to be
 * the set of members m such that all of the following hold:
 * • m is accessible to K and
 * • A is a direct superinterface of J and either
 * – A declares a member m or
 * – m is a member of inherited(A, K).
 * • m is not overridden by J.
 * ...
 * Otherwise, if the static types T1,...,Tk of the members m1,...,mk are not
 * identical, then there must be a member mx such that Tx <: Ti, 1 ≤ x ≤ k for
 * all i ∈ 1..k, or a static type warning occurs. The member that is inherited
 * is mx, if it exists; otherwise: let numberOf P ositionals(f) denote the
 * number of positional parameters of a function f, and let numberOf
 * RequiredParams(f) denote the number of required parameters of a function f.
 * Furthermore, let s denote the set of all named parameters of the m1,...,mk.
 * Then let
 * h = max(numberOf Positionals(mi)),
 * r = min(numberOf RequiredParams(mi)), i ∈ 1..k.
 * Then I has a method named n, with r required parameters of type dynamic,
 * h positional parameters of type dynamic, named parameters s of type dynamic
 * and return type dynamic.
 * @description Checks that there's no static warning if class implements two
 * interfaces with same named methods and different number of required formal
 * parameters and defines method with minimum number of required parameters
 * and maximum number of positional parameters.
 * @static-clean
 * @author ngl@unipro.ru
 */

abstract class SI1 {
  void foo(var v);
}

abstract class SI2 {
  void foo(var v, var vv);
}

class I implements SI1, SI2 {
  // It is expected that I inherits void foo(dynamic v1, [dynamic a])
  void foo(dynamic v, [dynamic a]) {}
}

main() {
  I i = new I();
  i.foo(1);
  i.foo(1,2);
}