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rational.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef COMMON_RATIONAL_H
00024 #define COMMON_RATIONAL_H
00025 
00026 #include "common/scummsys.h"
00027 #include "common/frac.h"
00028 
00029 namespace Common {
00030 
00032 class Rational {
00033 public:
00034     Rational();
00035     Rational(int num);
00036     Rational(int num, int denom);
00037 
00038     Rational &operator=(const Rational &right);
00039     Rational &operator=(int right);
00040 
00041     Rational &operator+=(const Rational &right);
00042     Rational &operator-=(const Rational &right);
00043     Rational &operator*=(const Rational &right);
00044     Rational &operator/=(const Rational &right);
00045 
00046     Rational &operator+=(int right);
00047     Rational &operator-=(int right);
00048     Rational &operator*=(int right);
00049     Rational &operator/=(int right);
00050 
00051     const Rational operator-() const;
00052 
00053     const Rational operator+(const Rational &right) const;
00054     const Rational operator-(const Rational &right) const;
00055     const Rational operator*(const Rational &right) const;
00056     const Rational operator/(const Rational &right) const;
00057 
00058     const Rational operator+(int right) const;
00059     const Rational operator-(int right) const;
00060     const Rational operator*(int right) const;
00061     const Rational operator/(int right) const;
00062 
00063     bool operator==(const Rational &right) const;
00064     bool operator!=(const Rational &right) const;
00065     bool operator>(const Rational &right) const;
00066     bool operator<(const Rational &right) const;
00067     bool operator>=(const Rational &right) const;
00068     bool operator<=(const Rational &right) const;
00069 
00070     bool operator==(int right) const;
00071     bool operator!=(int right) const;
00072     bool operator>(int right) const;
00073     bool operator<(int right) const;
00074     bool operator>=(int right) const;
00075     bool operator<=(int right) const;
00076 
00077     void invert();
00078     Rational getInverse() const;
00079 
00080     int toInt() const;
00081     double toDouble() const;
00082     frac_t toFrac() const;
00083 
00084     int getNumerator() const { return _num; }
00085     int getDenominator() const { return _denom; }
00086 
00087     bool isOne() const { return _num == _denom; }
00088 
00089     void debugPrint(int debuglevel = 0, const char *caption = "Rational:") const;
00090 
00091 private:
00092     int _num;
00093     int _denom;
00094 
00095     void cancel();
00096 };
00097 
00098 const Rational operator+(int left, const Rational &right);
00099 const Rational operator-(int left, const Rational &right);
00100 const Rational operator*(int left, const Rational &right);
00101 const Rational operator/(int left, const Rational &right);
00102 
00103 bool operator==(int left, const Rational &right);
00104 bool operator!=(int left, const Rational &right);
00105 bool operator>(int left, const Rational &right);
00106 bool operator<(int left, const Rational &right);
00107 bool operator>=(int left, const Rational &right);
00108 bool operator<=(int left, const Rational &right);
00109 
00110 } // End of namespace Common
00111 
00112 #endif


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