diff --git a/sprout/container/container_range_traits.hpp b/sprout/container/container_range_traits.hpp
index 62698769..fc88e1ca 100644
--- a/sprout/container/container_range_traits.hpp
+++ b/sprout/container/container_range_traits.hpp
@@ -632,7 +632,7 @@ namespace sprout {
 			typename sprout::container_traits<Container>::size_type
 		>::type
 		range_index_of_impl(Container& cont, typename sprout::container_traits<Container>::iterator p) {
-			return sprout::distance(begin(cont), p);
+			return sprout::distance(sprout::begin(cont), p);
 		}
 		template<typename Container>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
@@ -648,7 +648,7 @@ namespace sprout {
 			typename sprout::container_traits<Container const>::size_type
 		>::type
 		range_index_of_impl(Container const& cont, typename sprout::container_traits<Container const>::iterator p) {
-			return sprout::distance(begin(cont), p);
+			return sprout::distance(sprout::begin(cont), p);
 		}
 	}	// namespace detail
 }	// namespace sprout
@@ -658,24 +658,22 @@ namespace sprout_container_range_detail {
 	inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::iterator
 	range_begin(Container& cont) {
 		return sprout::detail::range_begin_impl(cont);
-//		return cont.begin();
 	}
 	template<typename Container>
 	inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
 	range_begin(Container const& cont) {
 		return sprout::detail::range_begin_impl(cont);
-//		return cont.begin();
 	}
 
 	template<typename Container>
 	inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::iterator
 	range_end(Container& cont) {
-		return cont.end();
+		return sprout::detail::range_end_impl(cont);
 	}
 	template<typename Container>
 	inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
 	range_end(Container const& cont) {
-		return cont.end();
+		return sprout::detail::range_end_impl(cont);
 	}
 
 	template<typename Container>
diff --git a/sprout/container/std/array.hpp b/sprout/container/std/array.hpp
index 4516058c..3c4d84ae 100644
--- a/sprout/container/std/array.hpp
+++ b/sprout/container/std/array.hpp
@@ -9,16 +9,37 @@
 #define SPROUT_CONTAINER_STD_ARRAY_HPP
 
 #include <array>
+#include <utility>
+#include <type_traits>
 #include <sprout/config.hpp>
-#if SPROUT_USE_INDEX_ITERATOR_IMPLEMENTATION
-#	include <type_traits>
-#	include <sprout/workaround/std/cstddef.hpp>
-#	include <sprout/container/traits.hpp>
-#	include <sprout/iterator/index_iterator.hpp>
-#endif
+#include <sprout/workaround/std/cstddef.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/iterator/index_iterator.hpp>
+#include <sprout/utility/forward.hpp>
+#include <sprout/utility/as_const.hpp>
+#include <sprout/memory/addressof.hpp>
+#include <sprout/functional/transparent.hpp>
 
-#if SPROUT_USE_INDEX_ITERATOR_IMPLEMENTATION
 namespace sprout {
+	namespace detail {
+		template<typename T = void>
+		struct const_subscript;
+		template<>
+		struct const_subscript<void>
+			: public sprout::transparent<>
+		{
+		public:
+			template<typename T, typename U>
+			SPROUT_CONSTEXPR decltype(std::declval<T>()[std::declval<U>()])
+			operator()(T&& x, U&& y)
+			const SPROUT_NOEXCEPT_IF_EXPR(std::declval<T>()[std::declval<U>()])
+			{
+				typedef decltype(std::declval<T>()[std::declval<U>()]) type;
+				return const_cast<type>(sprout::as_const(x)[SPROUT_FORWARD(U, y)]);
+			}
+		};
+	}	// namespace detail
+
 	//
 	// container_traits
 	//
@@ -27,8 +48,8 @@ namespace sprout {
 		: public sprout::detail::container_traits_default<std::array<T, N> >
 	{
 	public:
-		typedef sprout::index_iterator<std::array<T, N>&, true> iterator;
-		typedef sprout::index_iterator<std::array<T, N> const&, true> const_iterator;
+		typedef sprout::index_iterator<std::array<T, N>&, true, sprout::detail::const_subscript<> > iterator;
+		typedef sprout::index_iterator<std::array<T, N> const&, true, sprout::detail::const_subscript<> > const_iterator;
 	};
 
 	//
@@ -38,7 +59,14 @@ namespace sprout {
 	struct container_range_traits<std::array<T, N> >
 		: public sprout::detail::container_range_traits_default<std::array<T, N> >
 	{
+	private:
+		typedef sprout::detail::container_range_traits_default<std::array<T, N> > base_type;
 	public:
+		using base_type::range_front;
+		using base_type::range_back;
+		using base_type::range_at;
+	public:
+		// iterators:
 		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> >::iterator
 		range_begin(std::array<T, N>& cont) {
 			return typename sprout::container_traits<std::array<T, N> >::iterator(cont, 0);
@@ -47,7 +75,6 @@ namespace sprout {
 		range_begin(std::array<T, N> const& cont) {
 			return typename sprout::container_traits<std::array<T, N> const>::iterator(cont, 0);
 		}
-
 		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> >::iterator
 		range_end(std::array<T, N>& cont) {
 			return typename sprout::container_traits<std::array<T, N> >::iterator(cont, cont.size());
@@ -56,8 +83,32 @@ namespace sprout {
 		range_end(std::array<T, N> const& cont) {
 			return typename sprout::container_traits<std::array<T, N> const>::iterator(cont, cont.size());
 		}
+		// element access:
+		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> >::reference
+		range_front(std::array<T, N>& cont) {
+			typedef typename sprout::container_traits<std::array<T, N> >::reference type;
+			return const_cast<type>(base_type::range_front(sprout::as_const(cont)));
+		}
+		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> >::reference
+		range_back(std::array<T, N>& cont) {
+			typedef typename sprout::container_traits<std::array<T, N> >::reference type;
+			return const_cast<type>(base_type::range_back(sprout::as_const(cont)));
+		}
+		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> >::reference
+		range_at(std::array<T, N>& cont, typename sprout::container_traits<std::array<T, N> >::size_type i) {
+			typedef typename sprout::container_traits<std::array<T, N> >::reference type;
+			return const_cast<type>(base_type::range_at(sprout::as_const(cont), i));
+		}
+		// data access:
+		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> >::pointer
+		range_data(std::array<T, N>& cont) {
+			return sprout::addressof(range_front(cont));
+		}
+		static SPROUT_CONSTEXPR typename sprout::container_traits<std::array<T, N> const>::pointer
+		range_data(std::array<T, N> const& cont) {
+			return sprout::addressof(range_front(cont));
+		}
 	};
 }	// namespace sprout
-#endif
 
 #endif	// #ifndef SPROUT_CONTAINER_STD_ARRAY_HPP
diff --git a/sprout/tuple/std/array.hpp b/sprout/tuple/std/array.hpp
index 65e0b253..7e580045 100644
--- a/sprout/tuple/std/array.hpp
+++ b/sprout/tuple/std/array.hpp
@@ -13,6 +13,7 @@
 #include <sprout/config.hpp>
 #include <sprout/workaround/std/cstddef.hpp>
 #include <sprout/utility/move.hpp>
+#include <sprout/utility/as_const.hpp>
 #include <sprout/tuple/tuple/tuple_access_traits.hpp>
 #include <sprout/tuple/tuple/get.hpp>
 
@@ -28,7 +29,7 @@ namespace sprout {
 			static SPROUT_CONSTEXPR T&
 			tuple_get(std::array<T, N>& t) SPROUT_NOEXCEPT {
 				static_assert(I < N, "tuple_get: index out of range");
-				return t[I];
+				return const_cast<T&>(sprout::as_const(t)[I]);
 			}
 			template<std::size_t I>
 			static SPROUT_CONSTEXPR T const&
diff --git a/sprout/type_traits/is_within_tag_namespace.hpp b/sprout/type_traits/is_within_tag_namespace.hpp
index cf9dcfba..7689547a 100644
--- a/sprout/type_traits/is_within_tag_namespace.hpp
+++ b/sprout/type_traits/is_within_tag_namespace.hpp
@@ -46,10 +46,10 @@
 	struct SPROUT_PP_CAT(is_within_namespace_, NAME) \
 		: public sprout::is_within_tag_namespace<NAMESPACE::SPROUT_ADL_TEST_TAG(NAME), T> \
 	{}; \
-	SPROUT_IS_WITHIN_NAMESPACE_V(NAME, NAMESPACE);
+	SPROUT_IS_WITHIN_NAMESPACE_V(NAME, NAMESPACE)
 #if SPROUT_USE_VARIABLE_TEMPLATES
 #	define SPROUT_IS_WITHIN_NAMESPACE_V(NAME, NAMESPACE) \
-		template<typename T>
+		template<typename T> \
 		SPROUT_STATIC_CONSTEXPR bool SPROUT_PP_CAT(SPROUT_PP_CAT(is_within_namespace_, NAME), _v) = SPROUT_PP_CAT(is_within_namespace_, NAME)<T>::value
 #else	// #if SPROUT_USE_VARIABLE_TEMPLATES
 #	define SPROUT_IS_WITHIN_NAMESPACE_V(NAME, NAMESPACE) \