diff options
Diffstat (limited to 'src/list')
| -rw-r--r-- | src/list/operation/basic.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/list/operation/basic.h b/src/list/operation/basic.h index 1e05a50..cee4cbc 100644 --- a/src/list/operation/basic.h +++ b/src/list/operation/basic.h @@ -1,6 +1,8 @@ #ifndef TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_ #define TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_ +#include "operation/math.h" + namespace tav { template <typename Cons> @@ -16,6 +18,23 @@ struct Length<void> { typedef Size<0> type; }; +template < + typename Index, + typename Cons +> +struct Nth { + typedef If< + equal_value<Index, Size<0>>::value, + Head<Cons>, + typename Nth<Substract<Index, Size<1>>, Tail<Cons>>::type + > type; +}; + +template <typename Index> +struct Nth<Index, void> { + typedef void type; +}; + } #endif // TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_ |