TimeDependence.h

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// Copyright András Vukics 2006–2014. Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE.txt)
// -*- C++ -*-
#ifndef   CPPQEDCORE_STRUCTURE_TIME_H_INCLUDED
#define   CPPQEDCORE_STRUCTURE_TIME_H_INCLUDED

#include "TimeFwd.h"

#include <boost/operators.hpp>

#include <boost/mpl/if.hpp>


namespace structure {



enum TimeDependence {
  TWO_TIME, 
  ONE_TIME, 
  NO_TIME   
};


class TwoTime : private boost::equality_comparable<TwoTime>
{
public:
  TwoTime(double t, double t0) : t_(t), t0_(t0) {}
  
  double getT () const {return t_ ;}
  double getT0() const {return t0_;}
  
private:
  friend bool operator==(TwoTime t1, TwoTime t2) {return t1.t_==t2.t_ && t1.t0_==t2.t0_;}
  
  double t_, t0_;
  
};

class OneTime : private boost::equality_comparable<OneTime>
{
public:
  explicit OneTime(double t, double t0=0) : deltaT_(t-t0) {}

  operator double() const {return deltaT_;}

private:
  friend bool operator==(OneTime t1, OneTime t2) {return t1.deltaT_==t2.deltaT_;}

  double deltaT_;
  
};

class NoTime
{
public:
  explicit NoTime(double, double=0) {}

};



namespace time {


template<TimeDependence TD>
struct Dispatcher : boost::mpl::if_c<TD==TWO_TIME,TwoTime,
                                     typename boost::mpl::if_c<TD==ONE_TIME,OneTime,NoTime>::type
                                     >
{};



template<bool IS_TIME_DEPENDENT>
struct DispatcherIsTimeDependent : boost::mpl::if_c<IS_TIME_DEPENDENT,OneTime,NoTime>
{};



template<bool IS_TWO_TIME>
struct DispatcherIsTwoTime : boost::mpl::if_c<IS_TWO_TIME,TwoTime,OneTime>
{};

} // time


} // structure

#endif // CPPQEDCORE_STRUCTURE_TIME_H_INCLUDED