Moved class-based implementations into `detail` namespace

* while class templates enable e.g. hiding implementation details they also require evaluation via `Eval`
** this clutters up the actual logic and is now hidden behind aliae that perform the evaluation

1 files changed, 17 insertions, 9 deletions

diff --git a/src/list/cons.h b/src/list/cons.h
index 8efca67..95783b2 100644
--- a/src/list/cons.h
+++ b/src/list/cons.h
@@ -5,18 +5,12 @@
 
 namespace tav {
 
-template <
-	typename CAR,
-	typename CDR
->
-struct Cons {
-	typedef Pair<CAR, CDR> type;
-};
+namespace detail {
 
 template <typename Pair>
 struct Car {
 	static_assert(
-		Eval<IsPair<Pair>>::value,
+		IsPair<Pair>::value,
 		"Pair type required"
 	);
 
@@ -26,7 +20,7 @@ struct Car {
 template <typename Pair>
 struct Cdr {
 	static_assert(
-		Eval<IsPair<Pair>>::value,
+		IsPair<Pair>::value,
 		"Pair type required"
 	);
 
@@ -35,4 +29,18 @@ struct Cdr {
 
 }
 
+template <
+	typename CAR,
+	typename CDR
+>
+using Cons = Pair<CAR, CDR>;
+
+template <typename Pair>
+using Car = Eval<detail::Car<Pair>>;
+
+template <typename Pair>
+using Cdr = Eval<detail::Cdr<Pair>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_CONS_H_