#ifndef SPROUT_DETAIL_PARAM_AT_HPP
#define SPROUT_DETAIL_PARAM_AT_HPP

#include <cstddef>
#include <type_traits>
#include <sprout/config.hpp>

namespace sprout {
	namespace detail {
		template<typename R, typename T, typename... Values>
		inline SPROUT_CONSTEXPR typename std::enable_if<
			sizeof...(Values) == 0,
			R
		>::type param_at(
			std::size_t n,
			T const& v,
			Values const&... values
			)
		{
			return v;
		}
		template<typename R, typename T, typename... Values>
		inline SPROUT_CONSTEXPR typename std::enable_if<
			sizeof...(Values) != 0,
			R
		>::type param_at(
			std::size_t n,
			T const& v,
			Values const&... values
			)
		{
			return n == 0 ? v : sprout::detail::param_at<R>(n - 1, values...);
		}
	}	// namespace detail
}	// namespace sprout

#endif	// #ifndef SPROUT_DETAIL_PARAM_AT_HPP