angle.h

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#ifndef Math_angle_h
#define Math_angle_h
/* function to compute 3D angle 
 *
 * Ported from original code in RecoJets 
 * by Fedor Ratnikov, FNAL
 */
#include <cmath>

template <class T>
T angle(T x1, T y1, T z1, T x2, T y2, T z2) {
  return std::acos((x1 * x2 + y1 * y2 + z1 * z2) /
                   std::sqrt((x1 * x1 + y1 * y1 + z1 * z1) * (x2 * x2 + y2 * y2 + z2 * z2)));
}

template <typename T1, typename T2>
double angle(const T1& t1, const T2& t2) {
  return angle(t1.x(), t1.y(), t1.z(), t2.x(), t2.y(), t2.z());
}

#endif