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rational.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-2-0/common/rational.h $
 * $Id: rational.h 52616 2010-09-07 09:02:46Z wjpalenstijn $
 */

#ifndef COMMON_RATIONAL_H
#define COMMON_RATIONAL_H

#include "common/scummsys.h"
#include "common/frac.h"

namespace Common {

/** A simple rational class that holds fractions. */
00034 class Rational {
public:
      Rational();
      Rational(int num);
      Rational(int num, int denom);

      Rational &operator=(const Rational &right);
      Rational &operator=(int right);

      Rational &operator+=(const Rational &right);
      Rational &operator-=(const Rational &right);
      Rational &operator*=(const Rational &right);
      Rational &operator/=(const Rational &right);

      Rational &operator+=(int right);
      Rational &operator-=(int right);
      Rational &operator*=(int right);
      Rational &operator/=(int right);

      const Rational operator-() const;

      const Rational operator+(const Rational &right) const;
      const Rational operator-(const Rational &right) const;
      const Rational operator*(const Rational &right) const;
      const Rational operator/(const Rational &right) const;

      const Rational operator+(int right) const;
      const Rational operator-(int right) const;
      const Rational operator*(int right) const;
      const Rational operator/(int right) const;

      bool operator==(const Rational &right) const;
      bool operator!=(const Rational &right) const;
      bool operator>(const Rational &right) const;
      bool operator<(const Rational &right) const;
      bool operator>=(const Rational &right) const;
      bool operator<=(const Rational &right) const;

      bool operator==(int right) const;
      bool operator!=(int right) const;
      bool operator>(int right) const;
      bool operator<(int right) const;
      bool operator>=(int right) const;
      bool operator<=(int right) const;

      void invert();
      Rational getInverse() const;

      int toInt() const;
      double toDouble() const;
      frac_t toFrac() const;

      void debugPrint(int debuglevel = 0, const char *caption = "Rational:") const;

private:
      int _num;
      int _denom;

      void cancel();
};

const Rational operator+(int left, const Rational &right);
const Rational operator-(int left, const Rational &right);
const Rational operator*(int left, const Rational &right);
const Rational operator/(int left, const Rational &right);

bool operator==(int left, const Rational &right);
bool operator!=(int left, const Rational &right);
bool operator>(int left, const Rational &right);
bool operator<(int left, const Rational &right);
bool operator>=(int left, const Rational &right);
bool operator<=(int left, const Rational &right);

} // End of namespace Common

#endif

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