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#ifndef TYPEASVALUE_SRC_LIST_OPERATION_NTH_H_
#define TYPEASVALUE_SRC_LIST_OPERATION_NTH_H_
#include "operation/math.h"
namespace tav {
namespace detail {
template <
typename Index,
typename List
>
struct Nth {
typedef Eval<Nth<
Substract<Index, Size<1>>,
Tail<List>
>> type;
};
template <typename List>
struct Nth<Size<0>, List> {
typedef Head<List> type;
};
template <typename Index>
struct Nth<Index, void> {
typedef void type;
};
template <>
struct Nth<Size<0>, void> {
typedef void type;
};
}
template <
typename Index,
typename List
>
using Nth = Eval<detail::Nth<Index, List>>;
template <typename List>
using First = Nth<Size<0>, List>;
template <typename List>
using Second = Nth<Size<1>, List>;
template <typename List>
using Third = Nth<Size<2>, List>;
}
#endif // TYPEASVALUE_SRC_LIST_OPERATION_NTH_H_
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