Language/12_Expressions/20_Logical_Boolean_Expressions_A02_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; if e1 evaluates to true,  the result of evaluating b is true,
 * otherwise e2 is evaluated to an object o, 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
 * @reviewer kaigorodov
 */
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.isTrue(counterT==1);
  Expect.isTrue(getFalse() || getTrue());
  Expect.isTrue(counterF==1);
  Expect.isTrue(counterT==2);
}