// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_mathd
#define tools_mathd

namespace tools {

//have : static const pi = 3.1415926535897931160E0; ???

//HEALPix lsconstants.h. Quite not the same as us.
//const double pi=3.141592653589793238462643383279502884197;
//const double twopi=6.283185307179586476925286766559005768394;
//const double fourpi=12.56637061435917295385057353311801153679;
//const double halfpi=1.570796326794896619231321691639751442099;

inline double pi()      {return 3.1415926535897931160E0;}
inline double two_pi()  {return 6.2831853071795862320E0;}
inline double half_pi() {return 1.5707963267948965580E0;}

inline double deg2rad() {
  static const double s_v = pi()/180.0;
  return s_v;
}
inline double rad2deg() {
  static const double s_v = 180.0/pi();
  return s_v;
}

}

#include <cmath>

namespace tools {

inline double dfabs(const double& a_x) {return ::fabs(a_x);} //if passing a_fabs(const T&).

}

#endif