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| author | Adrian Kummerlaender | 2015-02-18 20:23:35 +0100 |
|---|---|---|
| committer | Adrian Kummerlaender | 2015-02-18 20:23:35 +0100 |
| commit | a3cfc224111c324324e29a9a7a61b511053ec14c (patch) | |
| tree | 64c92507ee353e64b00597460d428ad4c84e7b14 /src | |
| parent | af5662781840ac45c21cbf14cbc7973bcf39d1da (diff) | |
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Reimplemented `Append` in terms of `Fold`
* `Fold` already implements the necessary partial specializations for traversing list structures
Diffstat (limited to 'src')
| -rw-r--r-- | src/list/operation/append.h | 40 | ||||
| -rw-r--r-- | src/list/operation/concatenate.h | 1 | ||||
| -rw-r--r-- | src/list/operation/reverse.h | 2 |
3 files changed, 24 insertions, 19 deletions
diff --git a/src/list/operation/append.h b/src/list/operation/append.h index 2dcd184..77f72d9 100644 --- a/src/list/operation/append.h +++ b/src/list/operation/append.h @@ -1,27 +1,23 @@ #ifndef TYPEASVALUE_SRC_LIST_OPERATION_APPEND_H_ #define TYPEASVALUE_SRC_LIST_OPERATION_APPEND_H_ +#include "higher/fold.h" + namespace tav { namespace detail { -template < - typename Primary, - typename Secondary -> -struct Append { - typedef Cons< - Head<Primary>, - Eval<Append< - Tail<Primary>, - Secondary - >> - > type; -}; - -template <typename Secondary> -struct Append<void, Secondary> { - typedef Secondary type; +template <typename Replacement> +struct replace_void_cdr { + template <typename CAR, typename CDR> + using function = Cons< + CAR, + If< + Eval<std::is_void<CDR>>, + Replacement, + CDR + > + >; }; } @@ -30,7 +26,15 @@ template < typename Primary, typename Secondary > -using Append = Eval<detail::Append<Primary, Secondary>>; +using Append = If< + Eval<std::is_void<Primary>>, + Secondary, + Fold< + detail::replace_void_cdr<Secondary>::template function, + void, + Primary + > +>; } diff --git a/src/list/operation/concatenate.h b/src/list/operation/concatenate.h index 944470b..a5cbaa6 100644 --- a/src/list/operation/concatenate.h +++ b/src/list/operation/concatenate.h @@ -2,6 +2,7 @@ #define TYPEASVALUE_SRC_LIST_OPERATION_CONCATENATE_H_ #include "append.h" +#include "higher/remove.h" #include "higher/fold.h" namespace tav { diff --git a/src/list/operation/reverse.h b/src/list/operation/reverse.h index 6d9237d..cabc229 100644 --- a/src/list/operation/reverse.h +++ b/src/list/operation/reverse.h @@ -12,7 +12,7 @@ template < typename Current, typename Previous > -using reversed_append = tav::Append<Previous, List<Current>>; +using reversed_append = Append<Previous, List<Current>>; } |