mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
38 lines
881 B
C++
38 lines
881 B
C++
|
#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>
|
||
|
|
SPROUT_CONSTEXPR inline 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>
|
||
|
|
SPROUT_CONSTEXPR inline 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
|