diff --git a/sprout/algorithm/fixed/copy.hpp b/sprout/algorithm/fixed/copy.hpp
index 28c3d599..dee70dde 100644
--- a/sprout/algorithm/fixed/copy.hpp
+++ b/sprout/algorithm/fixed/copy.hpp
@@ -16,7 +16,6 @@
 #include <sprout/container/functions.hpp>
 #include <sprout/container/indexes.hpp>
 #include <sprout/iterator/operation.hpp>
-#include <sprout/iterator/next_iterator.hpp>
 #include <sprout/algorithm/fixed/result_of.hpp>
 #include <sprout/pit/pit.hpp>
 #include <sprout/math/comparison.hpp>
@@ -64,7 +63,7 @@ namespace sprout {
 				sprout::container_traits<Result>::static_size == sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
 			>::type
-			copy_impl_fw(
+			copy_impl(
 				InputIterator, InputIterator, Result const& result,
 				typename sprout::container_traits<Result>::size_type,
 				Args const&... args
@@ -77,14 +76,14 @@ namespace sprout {
 				sprout::container_traits<Result>::static_size != sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
 			>::type
-			copy_impl_fw(
+			copy_impl(
 				InputIterator first, InputIterator last, Result const& result,
 				typename sprout::container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
 				return first != last && sizeof...(Args) < size
-					? sprout::fixed::detail::copy_impl_fw(sprout::next(first), last, result, size, args..., *first)
+					? sprout::fixed::detail::copy_impl(sprout::next(first), last, result, size, args..., *first)
 					: sprout::detail::container_complate(result, args...)
 					;
 			}
@@ -92,67 +91,10 @@ namespace sprout {
 			inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Result>::type
 			copy(
 				InputIterator first, InputIterator last, Result const& result,
-				std::forward_iterator_tag*
-				)
-			{
-				return sprout::fixed::detail::copy_impl_fw(first, last, result, sprout::size(result));
-			}
-
-			template<typename InputIterator, typename Result, typename... Args>
-			inline SPROUT_CONSTEXPR typename std::enable_if<
-				sprout::container_traits<Result>::static_size == sizeof...(Args) + 1,
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type
-			copy_impl_in(
-				sprout::next_iterator<InputIterator> const& first, InputIterator, Result const& result,
-				typename sprout::container_traits<Result>::size_type,
-				Args const&... args
-				)
-			{
-				return sprout::remake<Result>(result, sprout::size(result), args..., *first);
-			}
-			template<typename InputIterator, typename Result, typename... Args>
-			inline SPROUT_CONSTEXPR typename std::enable_if<
-				sprout::container_traits<Result>::static_size != sizeof...(Args) + 1,
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type
-			copy_impl_in(
-				sprout::next_iterator<InputIterator> const& first, InputIterator last, Result const& result,
-				typename sprout::container_traits<Result>::size_type size,
-				Args const&... args
-				)
-			{
-				return first.base() != last && sizeof...(Args) + 1 < size
-					? sprout::fixed::detail::copy_impl_in(sprout::next(first), last, result, size, args..., *first)
-					: sprout::detail::container_complate(result, args..., *first)
-					;
-			}
-			template<typename InputIterator, typename Result>
-			inline SPROUT_CONSTEXPR typename std::enable_if<
-				sprout::container_traits<Result>::static_size == 0,
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type
-			copy(
-				InputIterator, InputIterator, Result const& result,
 				std::input_iterator_tag*
 				)
 			{
-				return sprout::remake<Result>(result, sprout::size(result));
-			}
-			template<typename InputIterator, typename Result>
-			inline SPROUT_CONSTEXPR typename std::enable_if<
-				sprout::container_traits<Result>::static_size != 0,
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type
-			copy(
-				InputIterator first, InputIterator last, Result const& result,
-				std::input_iterator_tag*
-				)
-			{
-				return first != last
-					? sprout::fixed::detail::copy_impl_in(sprout::make_next_iterator(first), last, result, sprout::size(result))
-					: sprout::detail::container_complate(result)
-					;
+				return sprout::fixed::detail::copy_impl(first, last, result, sprout::size(result));
 			}
 
 			template<typename InputIterator, typename Result>