PtEtaPhiMass.h

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#ifndef DataFormats_Math_PtEtaPhiMass_h
#define DataFormats_Math_PtEtaPhiMass_h

#include<cmath>
inline float __attribute__((always_inline)) __attribute__ ((pure))
etaFromXYZ(float x, float y, float z) { float t(z/std::sqrt(x*x+y*y)); return ::asinhf(t);} 
inline float __attribute__((always_inline)) __attribute__ ((pure))
etaFromRZ(float r, float z) { float t(z/r); return ::asinhf(t);} 



class PtEtaPhiMass {
private:
  float pt_, eta_, phi_, mass_;
public:
  // default constructor (unitialized)
  PtEtaPhiMass() {}

  //positional constructor (still compatible with Root, c++03)
  PtEtaPhiMass(float ipt, float ieta, float iphi, float imass):
    pt_(ipt), eta_(ieta), phi_(ieta), mass_(imass){}

  float pt() const { return pt_;}
  float eta() const { return eta_; }
  float phi() const { return phi_; }
  float mass() const { return mass_; }

};



#endif