negator.cpp

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#include "stlexam.h"
#pragma hdrstop
/**************************************************************************
 *
 * negator.cpp - Example program for reversing the sense of predicate 
 *               function objects by using function adaptors and function
 *               objects. See Class Reference Section
 *
 ***************************************************************************
 *
 * (c) Copyright 1994, 1998 Rogue Wave Software, Inc.
 * ALL RIGHTS RESERVED
 *
 * The software and information contained herein are proprietary to, and
 * comprise valuable trade secrets of, Rogue Wave Software, Inc., which
 * intends to preserve as trade secrets such software and information.
 * This software is furnished pursuant to a written license agreement and
 * may be used, copied, transmitted, and stored only in accordance with
 * the terms of such license and with the inclusion of the above copyright
 * notice.  This software and information or any other copies thereof may
 * not be provided or otherwise made available to any other person.
 *
 * Notwithstanding any other lease or license that may pertain to, or
 * accompany the delivery of, this computer software and information, the
 * rights of the Government regarding its use, reproduction and disclosure
 * are as set forth in Section 52.227-19 of the FARS Computer
 * Software-Restricted Rights clause.
 * 
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
 * Technical Data and Computer Software clause at DFARS 252.227-7013.
 * Contractor/Manufacturer is Rogue Wave Software, Inc.,
 * P.O. Box 2328, Corvallis, Oregon 97339.
 *
 * This computer software and information is distributed with "restricted
 * rights."  Use, duplication or disclosure is subject to restrictions as
 * set forth in NASA FAR SUP 18-52.227-79 (April 1985) "Commercial
 * Computer Software-Restricted Rights (April 1985)."  If the Clause at
 * 18-52.227-74 "Rights in Data General" is specified in the contract,
 * then the "Alternate III" clause applies.
 *
 **************************************************************************/
#include<functional>
#include<algorithm>

#ifdef _RW_STD_IOSTREAM
#include <iostream>
#else
#include <iostream.h>
#endif     

#ifndef _RWSTD_NO_NAMESPACE
using namespace std;
#endif

#ifndef _RWSTD_NO_NAMESPACE
using std::unary_function;
#endif
//
// Create a new predicate from unary_function.
//
template<class Arg>
class is_odd : public unary_function<Arg, bool>
{
public:
  bool operator() (const Arg& arg1) const
  {
    return (arg1 % 2 ? true : false);
  }
};

int main ()
{
#ifndef _RWSTD_NO_NAMESPACE
using namespace std;
#endif

  less<int> less_func;
  //
  // Use not2 on less.
  //
  cout << (less_func(1,4) ? "TRUE" : "FALSE") << endl;
  cout << (less_func(4,1) ? "TRUE" : "FALSE") << endl;
  cout << (not2(less<int>())(1,4) ? "TRUE" : "FALSE") << endl;
  cout << (not2(less<int>())(4,1) ? "TRUE" : "FALSE") << endl;   
  //
  // Create an instance of our predicate.
  //
  is_odd<int> odd;
  //
  // Use not1 on our user defined predicate.
  //
  cout << (odd(1) ? "TRUE" : "FALSE") << endl;
  cout << (odd(4) ? "TRUE" : "FALSE") << endl;
  cout << (not1(odd)(1) ? "TRUE" : "FALSE") << endl;
  cout << (not1(odd)(4) ? "TRUE" : "FALSE") << endl;

  return 0;
}