Language/Expressions/Logical_Boolean_Expressions/evaluation_form_or_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 Evaluation of a logical boolean expression b of the form e1 || e2
 * causes the evaluation of e1 which is then subjected to boolean conversion,
 * yielding an object o1; if e1 evaluates to true, the result of evaluating b
 * is true, otherwise e2 is evaluated to an object o2, which is then subjected
 * to boolean conversion producing an object r, which is the value of b.
 * @description Checks that an expression of the form e1 || e2 is evaluated
 * correctly.
 * @author msyabro
 */
import '../../../Utils/expect.dart';

int counterF = 0;
int counterT = 0;

bool getFalse() {
  counterF++;
  return false;
}

bool getTrue() {
  counterT++;
  return true;
}

main() {
  Expect.isTrue(true || true);
  Expect.isTrue(true || false);
  Expect.isTrue(false || true);
  Expect.isFalse(false || false);

  Expect.isTrue(getTrue() || getTrue());
  Expect.equals(1, counterT);
  Expect.isTrue(getFalse() || getTrue());
  Expect.equals(1, counterF);
  Expect.equals(2, counterT);
}