gplib/include/gp/math/details/math_definitions.hpp

#pragma once

namespace gp {
  namespace math {
    template<typename T>
    constexpr T pi;

    template<typename T>
    T abs(T);
        
    template<typename word_t>
    word_t log2(word_t v);

    /**
      * @brief Returns \f$n\f$ so that it is the smallest value that matches for \f$v\leq{}log2(2^n)\f$
      * 
      * @tparam word_t 
      * @param v 
      * @return constexpr word_t 
      */
    template<typename word_t>
    constexpr word_t msb(word_t v);

    /**
    * @brief Reads the sign of a value
    * 
    * @tparam T 
    * @return -1 if the value is negative
    * @return 0 if the value is 0 or not a number
    * @return 1 if the value is positive
    */
    template<typename T>
    T sign(T);
  }
}