From 46e174935b122c0da4b51532a7f683a512eeaf65 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 15 Feb 2015 14:07:50 +0100
Subject: 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

---
 src/conditional/cond.h                 | 19 +++++++++++++------
 src/conditional/if.h                   |  4 ++--
 src/function/apply.h                   |  8 ++++----
 src/function/detail/apply.h            |  8 ++++----
 src/list/cons.h                        | 26 +++++++++++++++++---------
 src/list/generator/iota.h              | 17 ++++++++++++++---
 src/list/generator/make_list.h         | 16 +++++++++++++---
 src/list/list.h                        | 11 +++++++++--
 src/list/operation/append.h            | 14 ++++++++++++--
 src/list/operation/basic.h             | 15 +++++++++------
 src/list/operation/delete_nth.h        |  4 ++--
 src/list/operation/drop.h              |  9 +++++++++
 src/list/operation/higher/drop_while.h | 14 ++++++++++++--
 src/list/operation/higher/filter.h     | 18 +++++++-----------
 src/list/operation/higher/find.h       | 14 ++++++++++++--
 src/list/operation/higher/fold.h       | 15 +++++++++++++--
 src/list/operation/higher/map.h        | 12 +++++++++++-
 src/list/operation/higher/partition.h  |  5 +++--
 src/list/operation/higher/query.h      | 12 +++++-------
 src/list/operation/higher/remove.h     | 34 ++++++++++++++++++++++++++++++++++
 src/list/operation/higher/sort.h       | 34 ++++++++++++++++++++++------------
 src/list/operation/higher/take_while.h | 18 ++++++++++++++----
 src/list/operation/nth.h               | 26 ++++++++++++++++++--------
 src/list/operation/reverse.h           | 13 ++++++++++---
 src/list/operation/take.h              | 13 +++++++++++--
 src/pair.h                             |  2 +-
 src/runtime/list/for_each.h            |  2 ++
 27 files changed, 283 insertions(+), 100 deletions(-)
 create mode 100644 src/list/operation/higher/remove.h

(limited to 'src')

diff --git a/src/conditional/cond.h b/src/conditional/cond.h
index 2d6a415..f6b7965 100644
--- a/src/conditional/cond.h
+++ b/src/conditional/cond.h
@@ -8,22 +8,29 @@
 
 namespace tav {
 
+namespace detail {
+
 template <typename... Branches>
 class Cond {
 	private:
 		template <typename Pair>
-		using predicate = IsTrue<Eval<Eval<Car<Pair>>>>;
+		using predicate = IsTrue<tav::Car<Pair>>;
 
 	public:
-		typedef Eval<Cdr<
-			Eval<Find<
+		typedef tav::Cdr<
+			tav::Find<
 				predicate,
-				Eval<List<Branches...>>
-			>>
-		>> type;
+				tav::List<Branches...>
+			>
+		> type;
 
 };
 
 }
 
+template <typename... Branches>
+using Cond = Eval<detail::Cond<Branches...>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_CONDITIONAL_COND_H_
diff --git a/src/conditional/if.h b/src/conditional/if.h
index b99f399..9be1a50 100644
--- a/src/conditional/if.h
+++ b/src/conditional/if.h
@@ -10,11 +10,11 @@ template <
 	typename TrueBranch,
 	typename FalseBranch
 >
-using If = std::conditional<
+using If = Eval<std::conditional<
 	Condition::value,
 	TrueBranch,
 	FalseBranch
->;
+>>;
 
 }
 
diff --git a/src/function/apply.h b/src/function/apply.h
index f4de292..591fa8a 100644
--- a/src/function/apply.h
+++ b/src/function/apply.h
@@ -19,22 +19,22 @@ template <
 >
 struct Apply : Cond<
 	Pair<
-		GreaterThan<Eval<detail::count_placeholders<Arguments...>>, Size<2>>,
+		GreaterThan<detail::count_placeholders<Arguments...>, Size<2>>,
 		detail::apply_variadic<Function, Arguments...>
 	>,
 	Pair<
-		IsEqualValue<Eval<detail::count_placeholders<Arguments...>>, Size<2>>,
+		IsEqualValue<detail::count_placeholders<Arguments...>, Size<2>>,
 		detail::apply_pair<Function, Arguments...>
 	>,
 	Pair<
-		IsEqualValue<Eval<detail::count_placeholders<Arguments...>>, Size<1>>,
+		IsEqualValue<detail::count_placeholders<Arguments...>, Size<1>>,
 		detail::apply_single<Function, Arguments...>
 	>,
 	Pair<
 		Boolean<true>,
 		detail::apply_none<Function, Arguments...>
 	>
->::type { };
+> { };
 
 }
 
diff --git a/src/function/detail/apply.h b/src/function/detail/apply.h
index da347f7..8d4ef6d 100644
--- a/src/function/detail/apply.h
+++ b/src/function/detail/apply.h
@@ -13,7 +13,7 @@ namespace detail {
 struct placeholder_tag { };
 
 template <typename Type>
-using is_placeholder = tav::Boolean<
+using is_placeholder = Boolean<
 	std::is_base_of<placeholder_tag, Type>::value
 >;
 
@@ -33,13 +33,13 @@ template <
 	int      Index
 >
 struct resolve_placeholder<Partials, placeholder<Index>> {
-	typedef Eval<Nth<Size<Index>, Partials>> type;
+	typedef tav::Nth<Size<Index>, Partials> type;
 };
 
 template <typename... Arguments>
 using count_placeholders = Count<
 	is_placeholder,
-	Eval<List<Arguments...>>
+	tav::List<Arguments...>
 >;
 
 template <
@@ -58,7 +58,7 @@ struct apply_variadic {
 	template <typename... Partials>
 	using function = Function<
 		Eval<resolve_placeholder<
-			Eval<List<Partials...>>,
+			tav::List<Partials...>,
 			Arguments
 		>>...
 	>;
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_
diff --git a/src/list/generator/iota.h b/src/list/generator/iota.h
index 56ebeca..73b7cc8 100644
--- a/src/list/generator/iota.h
+++ b/src/list/generator/iota.h
@@ -5,20 +5,22 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename Count,
 	typename Initial,
 	typename Step
 >
 struct Iota {
-	typedef Eval<Cons<
+	typedef Cons<
 		Initial,
 		Eval<Iota<
 			Substract<Count, Size<1>>,
 			Add<Initial, Step>,
 			Step
 		>>
-	>> type;
+	> type;
 };
 
 template <
@@ -26,9 +28,18 @@ template <
 	typename Step
 >
 struct Iota<Size<1>, Initial, Step> {
-	typedef Eval<Cons<Initial, void>> type;
+	typedef Cons<Initial, void> type;
 };
 
 }
 
+template <
+	typename Count,
+	typename Initial,
+	typename Step
+>
+using Iota = Eval<detail::Iota<Count, Initial, Step>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_GENERATOR_IOTA_H_
diff --git a/src/list/generator/make_list.h b/src/list/generator/make_list.h
index d927905..863dce2 100644
--- a/src/list/generator/make_list.h
+++ b/src/list/generator/make_list.h
@@ -6,25 +6,35 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename Count,
 	typename Element
 >
 struct MakeList {
-	typedef Eval<Cons<
+	typedef Cons<
 		Element,
 		Eval<MakeList<
 			Substract<Count, Size<1>>,
 			Element
 		>>
-	>> type;
+	> type;
 };
 
 template <typename Element>
 struct MakeList<Size<1>, Element> {
-	typedef Eval<Cons<Element, void>> type;
+	typedef Cons<Element, void> type;
 };
 
 }
 
+template <
+	typename Count,
+	typename Element
+>
+using MakeList = Eval<detail::MakeList<Count, Element>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_GENERATOR_MAKE_LIST_H_
diff --git a/src/list/list.h b/src/list/list.h
index e369739..c9e6a9e 100644
--- a/src/list/list.h
+++ b/src/list/list.h
@@ -5,6 +5,8 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename    Head,
 	typename... Tail
@@ -36,6 +38,11 @@ struct List<void, void> {
 	typedef void type;
 };
 
+}
+
+template <typename... Elements>
+using List = Eval<detail::List<Elements...>>;
+
 template <
 	typename Type,
 	Type...  Values
@@ -45,10 +52,10 @@ using ListOfType = List<
 >;
 
 template <typename Cons>
-using Head = Eval<Car<Cons>>;
+using Head = Car<Cons>;
 
 template <typename Cons>
-using Tail = Eval<Cdr<Cons>>;
+using Tail = Cdr<Cons>;
 
 }
 
diff --git a/src/list/operation/append.h b/src/list/operation/append.h
index 28c9adf..2dcd184 100644
--- a/src/list/operation/append.h
+++ b/src/list/operation/append.h
@@ -3,18 +3,20 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename Primary,
 	typename Secondary
 >
 struct Append {
-	typedef Eval<Cons<
+	typedef Cons<
 		Head<Primary>,
 		Eval<Append<
 			Tail<Primary>,
 			Secondary
 		>>
-	>> type;
+	> type;
 };
 
 template <typename Secondary>
@@ -24,4 +26,12 @@ struct Append<void, Secondary> {
 
 }
 
+template <
+	typename Primary,
+	typename Secondary
+>
+using Append = Eval<detail::Append<Primary, Secondary>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_APPEND_H_
diff --git a/src/list/operation/basic.h b/src/list/operation/basic.h
index 5f9a3f9..a299938 100644
--- a/src/list/operation/basic.h
+++ b/src/list/operation/basic.h
@@ -6,21 +6,24 @@
 
 namespace tav {
 
-template <typename Cons>
+namespace detail {
+
+template <typename List>
 class Length {
 	private:
 		template <typename, typename Accumulated>
 		using accumulate = Add<Size<1>, Accumulated>;
 
 	public:
-		typedef Eval<Fold<
-			accumulate,
-			Size<0>,
-			Cons
-		>> type;
+		typedef tav::Fold<accumulate, Size<0>, List> type;
 
 };
 
 }
 
+template <typename List>
+using Length = Eval<detail::Length<List>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_
diff --git a/src/list/operation/delete_nth.h b/src/list/operation/delete_nth.h
index 6127ade..18e52bf 100644
--- a/src/list/operation/delete_nth.h
+++ b/src/list/operation/delete_nth.h
@@ -12,8 +12,8 @@ template <
 	typename List
 >
 using DeleteNth = Append<
-	Eval<Take<Index, List>>,
-	Eval<Drop<Add<Index, Size<1>>, List>>
+	Take<Index, List>,
+	Drop<Add<Index, Size<1>>, List>
 >;
 
 }
diff --git a/src/list/operation/drop.h b/src/list/operation/drop.h
index c61983b..c7745d7 100644
--- a/src/list/operation/drop.h
+++ b/src/list/operation/drop.h
@@ -5,6 +5,8 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename Count,
 	typename Current
@@ -31,6 +33,13 @@ struct Drop<Size<0>, void> {
 	typedef void type;
 };
 
+}
+
+template <
+	typename Count,
+	typename Current
+>
+using Drop = Eval<detail::Drop<Count, Current>>;
 
 }
 
diff --git a/src/list/operation/higher/drop_while.h b/src/list/operation/higher/drop_while.h
index 8ba2664..021698f 100644
--- a/src/list/operation/higher/drop_while.h
+++ b/src/list/operation/higher/drop_while.h
@@ -5,16 +5,18 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename> class Predicate,
 	typename                 Current
 >
 struct DropWhile {
-	typedef Eval<If<
+	typedef If<
 		Eval<Predicate<Head<Current>>>,
 		Eval<DropWhile<Predicate, Tail<Current>>>,
 		Current
-	>> type;
+	> type;
 };
 
 template <
@@ -26,4 +28,12 @@ struct DropWhile<Predicate, void> {
 
 }
 
+template <
+	template<typename> class Predicate,
+	typename                 Current
+>
+using DropWhile = Eval<detail::DropWhile<Predicate, Current>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_DROP_WHILE_H_
diff --git a/src/list/operation/higher/filter.h b/src/list/operation/higher/filter.h
index 3588400..17d49c2 100644
--- a/src/list/operation/higher/filter.h
+++ b/src/list/operation/higher/filter.h
@@ -6,6 +6,8 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename> class Predicate,
 	typename                 List
@@ -18,28 +20,22 @@ class Filter {
 		>
 		using predicate_wrapper = If<
 			Eval<Predicate<Current>>,
-			Eval<Cons<Current, Previous>>,
+			Cons<Current, Previous>,
 			Previous
 		>;
 
 	public:
-		typedef Eval<Fold<predicate_wrapper, void, List>> type;
+		typedef tav::Fold<predicate_wrapper, void, List> type;
 
 };
 
+}
+
 template <
 	template<typename> class Predicate,
 	typename                 List
 >
-class Remove {
-	private:
-		template <typename Element>
-		using predicate_negator = Not<Predicate<Element>>;
-
-	public:
-		typedef Eval<Filter<predicate_negator, List>> type;
-
-};
+using Filter = Eval<detail::Filter<Predicate, List>>;
 
 }
 
diff --git a/src/list/operation/higher/find.h b/src/list/operation/higher/find.h
index abc3199..48533b7 100644
--- a/src/list/operation/higher/find.h
+++ b/src/list/operation/higher/find.h
@@ -6,16 +6,18 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename> class Predicate,
 	typename                 Current
 >
 struct Find {
-	typedef Eval<If<
+	typedef If<
 		Eval<Predicate<Head<Current>>>,
 		Head<Current>,
 		Eval<Find<Predicate, Tail<Current>>>
-	>> type;
+	> type;
 };
 
 template <
@@ -27,4 +29,12 @@ struct Find<Predicate, void> {
 
 }
 
+template <
+	template<typename> class Predicate,
+	typename                 List
+>
+using Find = Eval<detail::Find<Predicate, List>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_
diff --git a/src/list/operation/higher/fold.h b/src/list/operation/higher/fold.h
index 3ed0a42..7364fe5 100644
--- a/src/list/operation/higher/fold.h
+++ b/src/list/operation/higher/fold.h
@@ -3,16 +3,18 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename, typename> class Function,
 	typename                           Initial,
 	typename                           Current
 >
 struct Fold {
-	typedef Eval<Function<
+	typedef Function<
 		Head<Current>,
 		Eval<Fold<Function, Initial, Tail<Current>>>
-	>> type;
+	> type;
 };
 
 template <
@@ -25,4 +27,13 @@ struct Fold<Function, Initial, void> {
 
 }
 
+template <
+	template<typename, typename> class Function,
+	typename                           Initial,
+	typename                           Current
+>
+using Fold = Eval<detail::Fold<Function, Initial, Current>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FOLD_H_
diff --git a/src/list/operation/higher/map.h b/src/list/operation/higher/map.h
index ac214b7..cc30355 100644
--- a/src/list/operation/higher/map.h
+++ b/src/list/operation/higher/map.h
@@ -5,6 +5,8 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename> class Function,
 	typename                 List
@@ -21,10 +23,18 @@ class Map {
 		>;
 
 	public:
-		typedef Eval<Fold<function_wrapper, void, List>> type;
+		using type = tav::Fold<function_wrapper, void, List>;
 
 };
 
 }
 
+template <
+	template<typename> class Function,
+	typename                 List
+>
+using Map = Eval<detail::Map<Function, List>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_MAP_H_
diff --git a/src/list/operation/higher/partition.h b/src/list/operation/higher/partition.h
index eedeb91..ee49fcc 100644
--- a/src/list/operation/higher/partition.h
+++ b/src/list/operation/higher/partition.h
@@ -2,6 +2,7 @@
 #define TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_PARTITION_H_
 
 #include "filter.h"
+#include "remove.h"
 
 namespace tav {
 
@@ -10,8 +11,8 @@ template <
 	typename                 Elements
 >
 using Partition = Cons<
-	Eval<Filter<Predicate, Elements>>,
-	Eval<Remove<Predicate, Elements>>
+	Filter<Predicate, Elements>,
+	Remove<Predicate, Elements>
 >;
 
 }
diff --git a/src/list/operation/higher/query.h b/src/list/operation/higher/query.h
index 1d00267..c6c73f4 100644
--- a/src/list/operation/higher/query.h
+++ b/src/list/operation/higher/query.h
@@ -15,7 +15,7 @@ template <
 using Any = Fold<
 	Or,
 	Boolean<false>,
-	Eval<Map<Predicate, List>>
+	Map<Predicate, List>
 >;
 
 template <
@@ -25,16 +25,14 @@ template <
 using All = Fold<
 	And,
 	Boolean<true>,
-	Eval<Map<Predicate, List>>
+	Map<Predicate, List>
 >;
 
 template <
 	template<typename> class Predicate,
 	typename                 List
 >
-using None = Not<
-	Eval<Any<Predicate, List>>
->;
+using None = Not<Any<Predicate, List>>;
 
 template <
 	template<typename> class Predicate,
@@ -42,8 +40,8 @@ template <
 >
 using Count = Fold<
 	Add,
-	tav::Size<0>,
-	Eval<Map<Predicate, List>>
+	Size<0>,
+	Map<Predicate, List>
 >;
 
 }
diff --git a/src/list/operation/higher/remove.h b/src/list/operation/higher/remove.h
new file mode 100644
index 0000000..e67e962
--- /dev/null
+++ b/src/list/operation/higher/remove.h
@@ -0,0 +1,34 @@
+#ifndef TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_REMOVE_H_
+#define TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_REMOVE_H_
+
+#include "filter.h"
+
+namespace tav {
+
+namespace detail {
+
+template <
+	template<typename> class Predicate,
+	typename                 List
+>
+class Remove {
+	private:
+		template <typename Element>
+		using predicate_negator = Not<Predicate<Element>>;
+
+	public:
+		typedef tav::Filter<predicate_negator, List> type;
+
+};
+
+}
+
+template <
+	template<typename> class Predicate,
+	typename                 List
+>
+using Remove = Eval<detail::Remove<Predicate, List>>;
+
+}
+
+#endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_REMOVE_H_
diff --git a/src/list/operation/higher/sort.h b/src/list/operation/higher/sort.h
index cf86e9b..2976e06 100644
--- a/src/list/operation/higher/sort.h
+++ b/src/list/operation/higher/sort.h
@@ -8,31 +8,33 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename, typename> class Comparator,
 	typename                           Sequence
 >
 class Sort {
 	private:
-		using index = Divide<Eval<Length<Sequence>>, Size<2>>;
-		using pivot = Eval<Nth<index, Sequence>>;
+		using index = Divide<tav::Length<Sequence>, Size<2>>;
+		using pivot = tav::Nth<index, Sequence>;
 
-		using partitions = Eval<Partition<
+		using partitions = Partition<
 			Apply<Comparator, pivot, _0>::template function,
-			Eval<DeleteNth<index, Sequence>>
-		>>;
+			DeleteNth<index, Sequence>
+		>;
 
-		using lhs = Eval<Car<partitions>>;
-		using rhs = Eval<Cdr<partitions>>;
+		using lhs = tav::Car<partitions>;
+		using rhs = tav::Cdr<partitions>;
 
 	public:
-		typedef Eval<Concatenate<
-			Eval<List<
+		using type = Concatenate<
+			tav::List<
 				Eval<Sort<Comparator, lhs>>,
-				Eval<List<pivot>>,
+				tav::List<pivot>,
 				Eval<Sort<Comparator, rhs>>
-			>>
-		>> type;
+			>
+		>;
 };
 
 template <template<typename, typename> class Comparator>
@@ -42,4 +44,12 @@ struct Sort<Comparator, void> {
 
 }
 
+template <
+	template<typename, typename> class Comparator,
+	typename                           Sequence
+>
+using Sort = Eval<detail::Sort<Comparator, Sequence>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_SORT_H_
diff --git a/src/list/operation/higher/take_while.h b/src/list/operation/higher/take_while.h
index 8e61c45..dec5551 100644
--- a/src/list/operation/higher/take_while.h
+++ b/src/list/operation/higher/take_while.h
@@ -5,19 +5,21 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	template<typename> class Predicate,
 	typename                 Current
 >
 struct TakeWhile {
-	typedef Eval<If<
+	typedef If<
 		Eval<Predicate<Head<Current>>>,
-		Eval<Cons<
+		Cons<
 			Head<Current>,
 			Eval<TakeWhile<Predicate, Tail<Current>>>
-		>>,
+		>,
 		void
-	>> type;
+	> type;
 };
 
 template <
@@ -29,4 +31,12 @@ struct TakeWhile<Predicate, void> {
 
 }
 
+template <
+	template<typename> class Predicate,
+	typename                 Current
+>
+using TakeWhile = Eval<detail::TakeWhile<Predicate, Current>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_TAKE_WHILE_H_
diff --git a/src/list/operation/nth.h b/src/list/operation/nth.h
index 08e60cc..5a604f4 100644
--- a/src/list/operation/nth.h
+++ b/src/list/operation/nth.h
@@ -5,20 +5,22 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename Index,
-	typename Pair
+	typename List
 >
 struct Nth {
 	typedef Eval<Nth<
 		Substract<Index, Size<1>>,
-		Tail<Pair>
+		Tail<List>
 	>> type;
 };
 
-template <typename Pair>
-struct Nth<Size<0>, Pair> {
-	typedef Head<Pair> type;
+template <typename List>
+struct Nth<Size<0>, List> {
+	typedef Head<List> type;
 };
 
 template <typename Index>
@@ -31,14 +33,22 @@ struct Nth<Size<0>, void> {
 	typedef void type;
 };
 
+}
+
+template <
+	typename Index,
+	typename List
+>
+using Nth = Eval<detail::Nth<Index, List>>;
+
 template <typename List>
-using First  = Eval<Nth<Size<0>, List>>;
+using First  = Nth<Size<0>, List>;
 
 template <typename List>
-using Second = Eval<Nth<Size<1>, List>>;
+using Second = Nth<Size<1>, List>;
 
 template <typename List>
-using Third  = Eval<Nth<Size<2>, List>>;
+using Third  = Nth<Size<2>, List>;
 
 }
 
diff --git a/src/list/operation/reverse.h b/src/list/operation/reverse.h
index d4b2be9..aabba92 100644
--- a/src/list/operation/reverse.h
+++ b/src/list/operation/reverse.h
@@ -6,6 +6,8 @@
 
 namespace tav {
 
+namespace detail {
+
 template <typename Sequence>
 class Reverse {
 	private:
@@ -13,16 +15,21 @@ class Reverse {
 			typename Current,
 			typename Previous
 		>
-		using reversed_append = Append<
+		using reversed_append = tav::Append<
 			Previous,
-			Eval<List<Current>>
+			tav::List<Current>
 		>;
 
 	public:
-		typedef Eval<Fold<reversed_append, void, Sequence>> type;
+		typedef tav::Fold<reversed_append, void, Sequence> type;
 
 };
 
 }
 
+template <typename Sequence>
+using Reverse = Eval<detail::Reverse<Sequence>>;
+
+}
+
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_REVERSE_H_
diff --git a/src/list/operation/take.h b/src/list/operation/take.h
index fdff123..effba33 100644
--- a/src/list/operation/take.h
+++ b/src/list/operation/take.h
@@ -5,18 +5,20 @@
 
 namespace tav {
 
+namespace detail {
+
 template <
 	typename Count,
 	typename Current
 >
 struct Take {
-	typedef Eval<Cons<
+	typedef Cons<
 		Head<Current>,
 		Eval<Take<
 			Substract<Count, Size<1>>,
 			Tail<Current>
 		>>
-	>> type;
+	> type;
 };
 
 template <typename Current>
@@ -34,6 +36,13 @@ struct Take<Size<0>, void> {
 	typedef void type;
 };
 
+}
+
+template <
+	typename Count,
+	typename Current
+>
+using Take = Eval<detail::Take<Count, Current>>;
 
 }
 
diff --git a/src/pair.h b/src/pair.h
index 20bef4e..8234382 100644
--- a/src/pair.h
+++ b/src/pair.h
@@ -19,7 +19,7 @@ struct Pair : detail::pair_tag {
 };
 
 template <typename Type>
-using IsPair = std::is_base_of<detail::pair_tag, Type>;
+using IsPair = Eval<std::is_base_of<detail::pair_tag, Type>>;
 
 }
 
diff --git a/src/runtime/list/for_each.h b/src/runtime/list/for_each.h
index b7496a8..a7dc2a8 100644
--- a/src/runtime/list/for_each.h
+++ b/src/runtime/list/for_each.h
@@ -7,6 +7,7 @@
 #include "list/list.h"
 
 namespace tav {
+
 namespace runtime {
 
 template <
@@ -28,6 +29,7 @@ void for_each(const Function& function) {
 }
 
 }
+
 }
 
 #endif  // TYPEASVALUE_SRC_RUNTIME_LIST_FOR_EACH_H_
-- 
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