constexpr_math.h

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#ifndef LARDATAALG_UTILITIES_CONSTEXPR_MATH_H
#define LARDATAALG_UTILITIES_CONSTEXPR_MATH_H

namespace util {

  // --- BEGIN simple mathematical functions -----------------------------------

  // this bizarre implementation is supposed to guarantee that `abs(-0)` is `0`
  template <typename T>
  constexpr auto abs(T v)
  {
    return (-T(0) < v) ? v : -v;
  }


  // --- END simple mathematical functions -------------------------------------

} // namespace util

#endif // LARDATAALG_UTILITIES_CONSTEXPR_MATH_H