Di.h

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#pragma once
 
#include <cmath>
 
#include <algorithm>
#include <iostream>
#include <type_traits>
 
#include "Core/Objects/interface/Jet.h"
#include "Core/Objects/interface/Lepton.h"
#include "Core/Objects/interface/Variation.h"
#include "Core/Objects/interface/Photon.h"
 
#include "Math/VectorUtil.h"
 
namespace DAS {
 
template<typename Obj1, typename Obj2> struct Di : public std::pair<Obj1*, Obj2*>,
                                                   public AbstractPhysicsObject {
 
    using base = std::pair<Obj1*, Obj2*>;
 
    using std::pair<Obj1*, Obj2*>::pair;   
    using std::pair<Obj1*, Obj2*>::first,  
          std::pair<Obj1*, Obj2*>::second; 
 
public:
    explicit operator bool () const { return first && second; }
 
    inline void clear () { first = nullptr; second = nullptr; }
 
    inline FourVector CorrP4 (const Uncertainties::Variation& v = Uncertainties::nominal) const override
                        { return first->CorrP4(v) + second->CorrP4(v); }
    inline float      CorrPt (const Uncertainties::Variation& v = Uncertainties::nominal) const override
                        { return CorrP4(v).Pt(); }
 
    inline float Rapidity (const Uncertainties::Variation& v = Uncertainties::nominal) const override
                        { return CorrP4(v).Rapidity(); }
    inline float AbsRap   (const Uncertainties::Variation& v = Uncertainties::nominal) const override
                        { return std::abs(Rapidity(v)); }
 
    inline float DeltaEta (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return second->CorrP4(v).Eta() - first->CorrP4(v).Eta(); }
    inline float DeltaPhi (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return ROOT::Math::VectorUtil::DeltaPhi(first->CorrP4(v), second->CorrP4(v)); }
    inline float DeltaR   (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return ROOT::Math::VectorUtil::DeltaR  (first->CorrP4(v), second->CorrP4(v)); }
 
    inline float Yboost (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return (first->Rapidity(v) + second->Rapidity(v))/2; }
    inline float Ystar  (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return (first->Rapidity(v) - second->Rapidity(v))/2; }
 
    inline float Ymax (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return std::max(first->AbsRap(), second->AbsRap()); }
    inline float HT   (const Uncertainties::Variation& v = Uncertainties::nominal) const
                        { return (first->CorrPt(v) + second->CorrPt(v))/2; }
 
    inline double Weight (const Uncertainties::Variation& v = Uncertainties::nominal) const override
                        { return first->Weight(v) * second->Weight(v); }
};
 
using GenDijet = Di<GenJet,GenJet>;
using GenDimuon = Di<GenMuon,GenMuon>;
using GenZJet = Di<GenDimuon,GenJet>;
using GenMmg = Di<GenDimuon,GenPhoton>;
using RecDijet = Di<RecJet,RecJet>;
using RecDimuon = Di<RecMuon,RecMuon>;
using RecZJet = Di<RecDimuon,RecJet>;
using RecMmg = Di<RecDimuon,RecPhoton>;
 
} // end of DAS namespace
 
template<typename Obj1, typename Obj2,
    class = typename std::enable_if_t<std::is_base_of_v<DAS::AbstractPhysicsObject, Obj1>>,
    class = typename std::enable_if_t<std::is_base_of_v<DAS::AbstractPhysicsObject, Obj2>>>
auto operator+ (Obj1& o1, Obj2& o2)
{
    return DAS::Di<Obj1,Obj2>{&o1,&o2};
}
 
template<typename Obj1, typename Obj2>
std::ostream& operator<< (std::ostream& s, const DAS::Di<Obj1,Obj2>& di)
{
    if (di)
        return s << '[' << *di.first << ", " << *di.second << "] = " << di.CorrP4();
    else
        return s << "\x1B[33minvalid system\x1B[0m";
}
 
#if defined(__ROOTCLING__)
#pragma link C++ class DAS::GenDijet::base +;
#pragma link C++ class DAS::GenDimuon::base +;
#pragma link C++ class DAS::GenZJet::base +;
#pragma link C++ class DAS::RecDijet::base +;
#pragma link C++ class DAS::RecDimuon::base +;
#pragma link C++ class DAS::RecZJet::base +;
 
#pragma link C++ class DAS::GenDijet +;
#pragma link C++ class DAS::GenDimuon +;
#pragma link C++ class DAS::GenZJet +;
#pragma link C++ class DAS::RecDijet +;
#pragma link C++ class DAS::RecDimuon +;
#pragma link C++ class DAS::RecZJet +;
#endif