diff options
| -rw-r--r-- | src/list/operation/basic.h | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/src/list/operation/basic.h b/src/list/operation/basic.h index 586cf2f..ff0a4d7 100644 --- a/src/list/operation/basic.h +++ b/src/list/operation/basic.h @@ -2,20 +2,23 @@ #define TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_ #include "operation/math.h" +#include "higher/fold.h" namespace tav { template <typename Cons> -struct Length { - typedef Add< - Size<1>, - typename Length<Tail<Cons> - >::type> type; -}; +class Length { + private: + template < + typename, + typename Current + > + struct Count { + typedef Add<Size<1>, Current> type; + }; -template <> -struct Length<void> { - typedef Size<0> type; + public: + typedef typename Fold<Count, Size<0>, Cons>::type type; }; template < |