norm.hpp

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# /*
#  * Created by YongGyu Lee on 2020/12/08.
#  */
#
# ifndef VCCC_NUMERIC_NORM_HPP
# define VCCC_NUMERIC_NORM_HPP
#
# include <cmath>
#
# include "vccc/type_traits.hpp"
# include "vccc/__numeric/sum.hpp"
 
namespace vccc {
 
template<typename InputIterator, std::enable_if_t<is_iterable<InputIterator>::value, int> = 0>
inline auto
norm(InputIterator first, InputIterator last)
{
  return std::sqrt(square_sum(first, last));
}
 
template<typename T, std::enable_if_t<std::is_arithmetic<T>::value, int> = 0>
inline T norm(T arg) {
  return std::abs(arg);
}
 
template<typename Arg, typename ...Args,
    std::enable_if_t<conjunction<std::is_arithmetic<Arg>, std::is_arithmetic<Args...>>::value, int> = 0>
inline auto
norm(Arg arg, Args... args)
{
  return std::sqrt(square_sum(arg, args...));
}
 
 
} // namespace vccc
 
#endif // VCCC_NUMERIC_NORM_HPP