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#ifndef __LOG_REP_H
#define __LOG_REP_H
#ifdef LOGREP
#include "definitions.h"
#include "AddLog.h"
#include <iostream>
#include <cmath>
using namespace std;
/* logRep: enables working with much larger or smaller numbers than normally possible
by the regular double representation
* Representation of a number x by the log of x
Note: Base is 2!!
WARNING: Note that logRep can only be used for positive values
(such as probablities) - you can't have the log of a negative!
For a general real number use class doubleRep.
*/
class logRep{
public:
logRep() : _log(VERYSMALL){}
logRep(MDOUBLE a) {_log = ((a==0.0) ? VERYSMALL : log(a));}
logRep(const logRep& other) : _log(other._log) {}
logRep* clone() {return new logRep(*this);}
void output(ostream &out) const{ out<<exp(_log);}
friend MDOUBLE convert(const logRep& a);
//inline MDOUBLE convert();
inline logRep& operator=(const logRep& a);
inline logRep& operator+=(logRep a);
friend inline logRep operator+(const logRep& a, const logRep& b);
inline logRep& operator-=(const logRep& a);
friend inline logRep operator-(const logRep& a, const logRep& b);
inline logRep& operator*=(const logRep& a);
friend inline logRep operator*(const logRep& a, const logRep& b);
inline logRep& operator/=(const logRep& a);
friend inline logRep operator/(const logRep& a, const logRep& b);
friend inline bool operator==(const logRep& a, const logRep& b);
friend inline bool operator!=(const logRep& a, const logRep& b);
friend inline bool operator<(const logRep& a, const logRep& b);
friend inline bool operator<=(const logRep& a, const logRep& b);
friend inline bool operator>(const logRep& a, const logRep& b);
friend inline bool operator>=(const logRep& a, const logRep& b);
friend inline MDOUBLE log(const logRep& d);
friend inline logRep exp(const logRep& d);
private:
const MDOUBLE getLog() const {return _log;}
private:
MDOUBLE _log;
//static tAddLog_Precompute _add;
};
MDOUBLE convert(const logRep& a); //declaration of this function to be implemented cpp
inline logRep& logRep::operator=(const logRep& a){
_log=a.getLog();
return *this;
}
//inline MDOUBLE convert(){
// return exp(_log);
//}
// Original version by Adi Stern
inline logRep& logRep::operator+=(logRep a){
if (_log == VERYSMALL)
_log = a._log;
else if (a._log == VERYSMALL ) return *this;
else _log = AddLog(_log, a._log);
return *this;
}
inline logRep operator+(const logRep& a, const logRep& b){
logRep temp(a);
temp+=b;
return temp;
}
inline logRep& logRep::operator*=(const logRep& a){
if ((_log == VERYSMALL) || (a._log== VERYSMALL )){
_log = VERYSMALL;
return *this;
}
_log+=a._log;
return *this;
}
inline logRep operator*(const logRep& a, const logRep& b){
logRep temp(a);
temp*=b;
return temp;
}
inline logRep& logRep::operator/=(const logRep& a){
_log-=a._log;
return *this;
}
inline logRep operator/(const logRep& a, const logRep& b){
logRep temp(a);
temp/=b;
return temp;
}
/************************
* Comparison operators *
************************/
inline bool operator==(const logRep& a, const logRep& b){
return (a.getLog()==b.getLog());
}
inline bool operator!=(const logRep& a, const logRep& b){
return !(a==b);
}
inline bool operator<(const logRep& a, const logRep& b){
if (a.getLog()<b.getLog()) {return true;}
else {return false;}
}
inline bool operator>(const logRep& a, const logRep& b){
if (a.getLog()>b.getLog()) {return true;}
else {return false;}
}
inline bool operator<=(const logRep& a, const logRep& b){
return !(a>b);
}
inline bool operator>=(const logRep& a, const logRep& b){
return !(a<b);
}
ostream& operator<<(ostream &out, const logRep& a);
inline MDOUBLE log(const logRep& d) {return d.getLog();}
inline ostream &operator<<(ostream &out, const VlogRep &v){
for (int j=0;j<v.size();++j)
out<< v[j]<<" ";
out <<endl;
return(out);
}
inline ostream &operator<<(ostream &out, const VVlogRep &m){
for (int i=0;i<m.size();++i)
out<<m[i];
out <<endl;
return(out);
}
inline logRep exp(const logRep& d) {
logRep res;
res._log = d.getLog();
return res;
}
#endif
#endif
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