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fixpoint: implementacion de numero de punto fijo
fixpoint: implementacion de numero de punto fijo
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fixpoint.h
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/ trunk / firmware / sources / timeEngined / libte / fixpoint.h
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/*
* fixpoint<T>.h
*
* Created on: Feb 24, 2015
* Author: aras
*/
#ifndef FIXPOINT_H_
#define FIXPOINT_H_
#include <inttypes.h>
#include <math.h>
#include <typeinfo>
#include <cstdio>
typedef fixpoint<int32_t> fix19_12;
#define N43_20 fixpoint<int64_t>
#define N9_23 fixpoint<int32_t>
#define FAC64 20
#define FAC32 12
template<class T>
class fixpoint {
private:
uint8_t factor;
T value;
public:
fixpoint<T>();
fixpoint<T>(T num);
void set_from_float(float num){value=T(num*(1<<factor));}
void set(T val){value = val;}
float tofloat();
friend inline fixpoint<T> operator-(const fixpoint<T> &num1, const fixpoint<T> &num2){
return fixpoint<T>(num1.value-num2.value);
}
friend inline fixpoint<T> operator+(const fixpoint<T> &num1, const fixpoint<T> &num2){
return fixpoint<T>(num1.value+num2.value);
}
friend inline fixpoint<T> operator*(const fixpoint<T> &num1, const fixpoint<T> &num2){
int64_t aux = (int64_t(num1.value)*int64_t(num2.value))>>num1.factor;
return fixpoint<T>(aux);
}
friend inline fixpoint<T> operator/(const fixpoint<T> &num1, const fixpoint<T> &num2){
int64_t aux = (int64_t(num1.value)<<num1.factor);
return fixpoint<T>(aux/num2.value);
}
inline fixpoint<T> power();
inline fixpoint<T> sqroot();
};
template<class T>
fixpoint<T>::fixpoint(){
if(typeid(T)==typeid(int32_t)){
factor=FAC32;
}
else{
factor=FAC64;
}
value=0;
}
template<class T>
fixpoint<T>::fixpoint(T num){
if(typeid(T)==typeid(int32_t)){
factor=FAC32;
}
else{
factor=FAC64;
}
value=num;
}
template<class T>
float fixpoint<T>::tofloat(){
return float(value)/(1<<factor);
}
template<class T>
fixpoint<T> fixpoint<T>::power(){
int64_t aux = (int64_t(value)*int64_t(value))>>factor;
return fixpoint<T>(aux);
}
template<class T>
fixpoint<T> fixpoint<T>::sqroot(){
T aux = sqrt(value);
return fixpoint<T>(aux<<(factor/2));
}
#endif /* FIXPOINT_H_ */