GTime.hpp
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/***************************************************************************
* GTime.hpp - Time class *
* ----------------------------------------------------------------------- *
* copyright (C) 2010-2012 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* 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 3 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, see <http://www.gnu.org/licenses/>. *
* *
***************************************************************************/
/**
* @file GTime.hpp
* @brief Time class interface definition
* @author Juergen Knoedlseder
*/
#ifndef GTIME_HPP
#define GTIME_HPP
/* __ Includes ___________________________________________________________ */
#include <string>
#include "GBase.hpp"
#include "GTimeReference.hpp"
/***********************************************************************//**
* @class GTime
*
* @brief Handles times in a system independent way
*
* The GTime class stores a time value in seconds in a GammaLib native time
* reference system. The GammaLib native time reference (i.e. time=0) is
* defined as
*
* January 1, 2010, 00:00:00 (TT)
*
* The time system is Terrestrial Time (TT). With respect to Coordinated
* Universal Time (UTC), TT time is greater than UTC time by 66.184 sec at
* January 1, 2010, 00:00:00. The difference is due to the introduction of
* leap seconds that synchronize TT with the Earth rotation (UTC).
***************************************************************************/
class GTime : public GBase {
// Operator friends
friend GTime operator+ (const GTime &a, const GTime &b);
friend GTime operator- (const GTime &a, const GTime &b);
friend GTime operator* (const double &a, const GTime &b);
friend GTime operator* (const GTime &a, const double &b);
friend GTime operator/ (const GTime &a, const double &b);
friend bool operator== (const GTime &a, const GTime &b);
friend bool operator!= (const GTime &a, const GTime &b);
friend bool operator< (const GTime &a, const GTime &b);
friend bool operator<= (const GTime &a, const GTime &b);
friend bool operator> (const GTime &a, const GTime &b);
friend bool operator>= (const GTime &a, const GTime &b);
public:
// Constructors and destructors
GTime(void);
GTime(const GTime& time);
explicit GTime(const double& time, const std::string& unit = "sec");
explicit GTime(const double& time, const GTimeReference& ref);
virtual ~GTime(void);
// Operators
GTime& operator=(const GTime& time);
// Methods
void clear(void);
GTime* clone(void) const;
double jd(void) const;
double mjd(void) const;
double secs(void) const;
double days(void) const;
double convert(const GTimeReference& ref) const;
void jd(const double& time);
void mjd(const double& time);
void secs(const double& seconds);
void days(const double& days);
void set(const double& time, const GTimeReference& ref);
GTimeReference reference(void) const;
std::string print(void) const;
protected:
// Protected methods
void init_members(void);
void copy_members(const GTime& time);
void free_members(void);
// Protected data members
double m_time; //!< Time in seconds in native reference
};
/***************************************************************************
* Inline friends *
***************************************************************************/
inline
GTime operator+ (const GTime& a, const GTime& b)
{
GTime result;
result.m_time = a.m_time + b.m_time;
return result;
}
inline
GTime operator- (const GTime& a, const GTime& b)
{
GTime result;
result.m_time = a.m_time - b.m_time;
return result;
}
inline
GTime operator* (const double& a, const GTime& b)
{
GTime result;
result.m_time = a * b.m_time;
return result;
}
inline
GTime operator* (const GTime& a, const double& b)
{
GTime result;
result.m_time = b * a.m_time;
return result;
}
inline
GTime operator/ (const GTime& a, const double& b)
{
GTime result;
result.m_time = a.m_time / b;
return result;
}
inline
bool operator== (const GTime &a, const GTime &b)
{
return (a.m_time == b.m_time);
}
inline
bool operator!= (const GTime &a, const GTime &b)
{
return (a.m_time != b.m_time);
}
inline
bool operator< (const GTime &a, const GTime &b)
{
return (a.m_time < b.m_time);
}
inline
bool operator<= (const GTime &a, const GTime &b)
{
return (a.m_time <= b.m_time);
}
inline
bool operator> (const GTime &a, const GTime &b)
{
return (a.m_time > b.m_time);
}
inline
bool operator>= (const GTime &a, const GTime &b)
{
return (a.m_time >= b.m_time);
}
#endif /* GTIME_HPP */