Constants.hpp

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#ifndef DART_MATH_CONSTANTS_HPP_
#define DART_MATH_CONSTANTS_HPP_
 
#include <limits>
 
namespace dart {
namespace math {
 
template <typename T>
struct constants
{
  static constexpr T pi()
  {
    return 3.141592653589793238462643383279502884197169399375105820974944592L;
  }
  static constexpr T two_pi()
  {
    return 2.0 * pi();
  }
  static constexpr T half_pi()
  {
    return 0.5 * pi();
  }
  static constexpr T pi_sqr()
  {
    return pi() * pi();
  }
 
  static constexpr T phi()
  {
    return 1.618033988749894848204586834365638117720309179805762862135448623L;
  }
 
  static constexpr T inf()
  {
    return std::numeric_limits<T>::infinity();
  }
};
 
using constantsf = constants<float>;
using constantsd = constants<double>;
 
} // namespace math
} // namespace dart
 
#endif // DART_MATH_CONSTANTS_HPP_