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