Language/13_Statements/15_Assert_A03_t08.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 In checked mode, execution of an assert statement assert(e); proceeds as follows:
 * The conditional expression e is evaluated to an object o. If the class of o is
 * a subtype of Function then let r be the result of invoking o with no arguments.
 * Otherwise, let r be o. It is a dynamic type error if o is not of type bool or
 * of type Function, or if r is not of type bool. If r is false, we say that the
 * assertion failed. If r is true, we say that the assertion succeeded. If the assertion
 * succeeded, execution of the assert statement is complete. If the assertion failed,
 * an AssertionError is thrown.
 * @description Checks that the assert statement succeeds if the conditional expression
 * evaluates to either true or () => true.
 * @author rodionov
 * @reviewer iefremov
 */
import "../../Utils/expect.dart";

import "../../Utils/dynamic_check.dart";

bool t() {return true;}
bool f() {return false;}

bool flag = false;
bool check() {flag = true; return flag;}

main() {
  assert(check());
  if(isCheckedMode()) {
    Expect.isTrue(flag);
  }
  assert(true);
  assert(true ? true : true);
  assert((1 > 0 ? true && true : true || false));
  assert(() => true);
  assert(t);
  assert("string".contains("tri") ? t : f);
  assert("string".contains("tri") ? (() => true) : (() => false));
}