Language/Expressions/Postfix_Expressions/conditional_decrement_t01.dart

// Copyright (c) 2016, 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 Execution of a postfix expression of the form e1?.v-- is
/// equivalent to executing ((x) => x == null? null: x.v--)(e1) unless e1 is
/// a type literal, in which case it is equivalent to e1.v--
/// @description Checks that evaluation of an expression of the form  e1?.v-- is
/// equivalent to executing ((x) => x == null? null: x.v--)(e1)
/// @author sgrekhov@unipro.ru

import '../../../Utils/expect.dart';

class C {
  int v = 0;
}

main() {
  C? c1 = null;
  Expect.equals(c1?.v--, null);

  var c2 = new C() as C?;
  Expect.equals(c2?.v--, 0);
  Expect.equals(c2?.v, -1);
}