FixedPoint 클래스 (C++)

정확도 향상을 위해서 굳이 floating point 를 사용할 필요가 없을 때,

FixedPoint 를 사용해서 사칙연산이 가능하도록 틈틈히 맹글어 두었다.

애초에 point position 을 지정할 수 있게 template 으로 맹글려 했으나,

첫 버전부터 너무 완벽하면 재미가 없을까봐 3 자리 FixedPoint 를 만듬.

FixedPoint.h

#ifndef _FIXED_POINT_H_ #define _FIXED_POINT_H_ namespace babo { class FixedPoint { public: FixedPoint() : _num(0) {} FixedPoint(int32 num) {operator=(num);} FixedPoint(float num) {operator=(num);} FixedPoint(double num) {operator=(num);} FixedPoint(const FixedPoint &num) {operator=(num);} ~FixedPoint() {} public: static const FixedPoint MAX; static const FixedPoint MIN; /***< fixed point position */ enum { POINT_POSITION = 1000, }; private: int32 _num; public: /**@ for serialization : write to int32*/ int32 makeInt32() const {return _num;} /**@ for serialization : read from int32*/ FixedPoint& fromInt32(int32 num) {_num = num; return *this;} public: FixedPoint& roundOffUnderPointAt(uint32 position); public: int32 getInt() const {return _num / POINT_POSITION;} float getFloat() const {return static_cast<float>(_num) / POINT_POSITION;} double getDouble() const {return static_cast<double>(_num) / POINT_POSITION;} FixedPoint& operator =(int32 op) {_num = op * POINT_POSITION; return *this;} FixedPoint& operator =(float op) {_num = static_cast<int32>(op * POINT_POSITION); return *this;} FixedPoint& operator =(double op) {_num = static_cast<int32>(op * POINT_POSITION); return *this;} FixedPoint& operator =(const FixedPoint &op) {_num = op._num; return *this;} FixedPoint& operator+=(int32 op) {_num += op * POINT_POSITION; return *this;} FixedPoint& operator+=(float op) {_num += static_cast<int32>(op * POINT_POSITION); return *this;} FixedPoint& operator+=(double op) {_num += static_cast<int32>(op * POINT_POSITION); return *this;} FixedPoint& operator+=(const FixedPoint &op) {_num += op._num; return *this;} FixedPoint& operator-=(int32 op) {_num -= op * POINT_POSITION; return *this;} FixedPoint& operator-=(float op) {_num -= static_cast<int32>(op * POINT_POSITION); return *this;} FixedPoint& operator-=(double op) {_num -= static_cast<int32>(op * POINT_POSITION); return *this;} FixedPoint& operator-=(const FixedPoint &op) {_num -= op._num; return *this;} FixedPoint& operator*=(int32 op) {_num *= op; return *this;} FixedPoint& operator*=(float op) {operator=(getDouble() * op); return *this;} FixedPoint& operator*=(double op) {operator=(getDouble() * op); return *this;} FixedPoint& operator*=(const FixedPoint &op) {operator=(getDouble() * op.getDouble()); return *this;} FixedPoint& operator/=(int32 op) {operator=(this->getDouble() / op); return *this;} FixedPoint& operator/=(float op) {operator=(this->getDouble() / op); return *this;} FixedPoint& operator/=(double op) {operator=(this->getDouble() / op); return *this;} FixedPoint& operator/=(const FixedPoint &op) {operator=(this->getDouble() / op.getDouble()); return *this;} bool operator==(int32 op) const {return (_num == op * POINT_POSITION);} bool operator==(float op) const {return (_num == static_cast<int32>(op * POINT_POSITION));} bool operator==(double op) const {return (_num == static_cast<int32>(op * POINT_POSITION));} bool operator==(const FixedPoint& op) const {return (_num == op._num);} bool operator!=(int32 op) const {return !(operator==(op));} bool operator!=(float op) const {return !(operator==(op));} bool operator!=(double op) const {return !(operator==(op));} bool operator!=(const FixedPoint& op) const {return (_num != op._num);} bool operator >(const FixedPoint &op) const {return _num > op._num;} bool operator >(int32 op) const {return operator>(FixedPoint(op));} bool operator >(float op) const {return operator>(FixedPoint(op));} bool operator >(double op) const {return operator>(FixedPoint(op));} bool operator <(const FixedPoint &op) const {return _num < op._num;} bool operator <(int32 op) const {return operator<(FixedPoint(op));} bool operator <(float op) const {return operator<(FixedPoint(op));} bool operator <(double op) const {return operator<(FixedPoint(op));} bool operator>=(const FixedPoint &op) const {return (_num >= op._num);} bool operator>=(int32 op) const {return operator>=(FixedPoint(op));} bool operator>=(float op) const {return operator>=(FixedPoint(op));} bool operator>=(double op) const {return operator>=(FixedPoint(op));} bool operator<=(const FixedPoint &op) const {return (_num <= op._num);} bool operator<=(int32 op) const {return operator<=(FixedPoint(op));} bool operator<=(float op) const {return operator<=(FixedPoint(op));} bool operator<=(double op) const {return operator<=(FixedPoint(op));} }; FixedPoint operator+(const FixedPoint& fp1, const FixedPoint& fp2); FixedPoint operator+(const FixedPoint& fp, int32 i); FixedPoint operator+(const FixedPoint& fp, float f); FixedPoint operator+(const FixedPoint& fp, double d); FixedPoint operator-(const FixedPoint& fp1, const FixedPoint& fp2); FixedPoint operator-(const FixedPoint& fp, int32 i); FixedPoint operator-(const FixedPoint& fp, float f); FixedPoint operator-(const FixedPoint& fp, double d); FixedPoint operator*(const FixedPoint& fp1, const FixedPoint& fp2); FixedPoint operator*(const FixedPoint& fp, int32 i); FixedPoint operator*(const FixedPoint& fp, float f); FixedPoint operator*(const FixedPoint& fp, double d); FixedPoint operator/(const FixedPoint& fp1, const FixedPoint& fp2); FixedPoint operator/(const FixedPoint& fp, int32 i); FixedPoint operator/(const FixedPoint& fp, float f); FixedPoint operator/(const FixedPoint& fp, double d); } //namespace babo #endif //_FIXED_POINT_H_

 

FixedPoint.cpp

#include <FixedPoint.h> using namespace babo; namespace babo { FixedPoint& FixedPoint::roundOffUnderPointAt(uint32 position) { if (position == 0 || position > 3) return *this; int32 devider = 1000; for (uint32 i = 1; i < position; i++) { devider /= 10; } _num = (_num + devider / 2) / devider * devider; return *this; } FixedPoint operator+(const FixedPoint& fp1, const FixedPoint& fp2) { FixedPoint fp; fp = fp1; return fp += fp2; } FixedPoint operator-(const FixedPoint& fp1, const FixedPoint& fp2) { FixedPoint fp; fp = fp1; return fp -= fp2; } FixedPoint operator*(const FixedPoint& fp1, const FixedPoint& fp2) { FixedPoint fp; fp = fp1; return fp *= fp2; } FixedPoint operator/(const FixedPoint& fp1, const FixedPoint& fp2) { FixedPoint fp; fp = fp1; return fp /= fp2; } FixedPoint operator+(const FixedPoint& fp, int32 i) {return (fp + FixedPoint(i));} FixedPoint operator+(const FixedPoint& fp, float f) {return (fp + FixedPoint(f));} FixedPoint operator+(const FixedPoint& fp, double d) {return (fp + FixedPoint(d));} FixedPoint operator-(const FixedPoint& fp, int32 i) {return (fp - FixedPoint(i));} FixedPoint operator-(const FixedPoint& fp, float f) {return (fp - FixedPoint(f));} FixedPoint operator-(const FixedPoint& fp, double d) {return (fp - FixedPoint(d));} FixedPoint operator*(const FixedPoint& fp, int32 i) {return (fp * FixedPoint(i));} FixedPoint operator*(const FixedPoint& fp, float f) {return (fp * FixedPoint(f));} FixedPoint operator*(const FixedPoint& fp, double d) {return (fp * FixedPoint(d));} FixedPoint operator/(const FixedPoint& fp, int32 i) {return (fp / FixedPoint(i));} FixedPoint operator/(const FixedPoint& fp, float f) {return (fp / FixedPoint(f));} FixedPoint operator/(const FixedPoint& fp, double d) {return (fp / FixedPoint(d));} } //namespace babo