diff --git a/sprout/algorithm/fit/partition_copy.hpp b/sprout/algorithm/fit/partition_copy.hpp
index 86bf3026..bd4b9422 100644
--- a/sprout/algorithm/fit/partition_copy.hpp
+++ b/sprout/algorithm/fit/partition_copy.hpp
@@ -7,7 +7,9 @@
 #include <sprout/algorithm/fixed/partition_copy.hpp>
 #include <sprout/algorithm/fit/result_of.hpp>
 #include <sprout/sub_array.hpp>
+#include <sprout/detail/algorithm_ext.hpp>
 #include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT_DETAIL
+#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT_DETAIL
 
 namespace sprout {
 	namespace fit {
@@ -24,7 +26,14 @@ namespace sprout {
 				return sprout::sub_copy(
 					sprout::get_fixed(sprout::fixed::partition_copy(first, last, result, pred)),
 					offset,
-					offset + NS_SSCRISK_CEL_OR_SPROUT_DETAIL::min(NS_SSCRISK_CEL_OR_SPROUT_DETAIL::count_if(first, last, pred), sprout::size(result))
+					offset + sprout::detail::count_n_if(
+						first,
+						NS_SSCRISK_CEL_OR_SPROUT_DETAIL::min(
+							NS_SSCRISK_CEL_OR_SPROUT_DETAIL::distance(first, last),
+							sprout::size(result)
+							),
+						pred
+						)
 					);
 			}
 		}	// namespace detail
diff --git a/sprout/algorithm/fixed/copy.hpp b/sprout/algorithm/fixed/copy.hpp
index 198ad235..77d8d6cc 100644
--- a/sprout/algorithm/fixed/copy.hpp
+++ b/sprout/algorithm/fixed/copy.hpp
@@ -10,6 +10,7 @@
 #include <sprout/fixed_container/functions.hpp>
 #include <sprout/iterator/operation.hpp>
 #include <sprout/algorithm/fixed/result_of.hpp>
+#include <sprout/detail/container_complate.hpp>
 #include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT_DETAIL
 
 namespace sprout {
@@ -53,37 +54,15 @@ namespace sprout {
 					NS_SSCRISK_CEL_OR_SPROUT_DETAIL::distance(first, last)
 					);
 			}
-			template<typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_impl_3(
-				Result const& result,
-				Args const&... args
-				)
-			{
-				return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
-			}
-			template<typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_impl_3(
-				Result const& result,
-				Args const&... args
-				)
-			{
-				return copy_impl_3(result, args..., *sprout::next(sprout::fixed_begin(result), sizeof...(Args)));
-			}
 			template<typename InputIterator, typename Result, typename... Args>
 			SPROUT_CONSTEXPR inline typename std::enable_if<
 				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_impl_2(
+			>::type copy_impl(
 				InputIterator first,
 				InputIterator last,
 				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
+				typename sprout::fixed_container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
@@ -93,59 +72,19 @@ namespace sprout {
 			SPROUT_CONSTEXPR inline typename std::enable_if<
 				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_impl_2(
+			>::type copy_impl(
 				InputIterator first,
 				InputIterator last,
 				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
+				typename sprout::fixed_container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
-				return first != last && sizeof...(Args) < static_cast<std::size_t>(offset)
-					? copy_impl_2(sprout::next(first), last, result, offset, args..., *first)
-					: copy_impl_3(result, args...)
+				return first != last && sizeof...(Args) < size
+					? sprout::fixed::detail::copy_impl(sprout::next(first), last, result, size, args..., *first)
+					: sprout::detail::container_complate(result, args...)
 					;
 			}
-			template<typename InputIterator, typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_impl_1(
-				InputIterator first,
-				InputIterator last,
-				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
-				Args const&... args
-				)
-			{
-				return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
-			}
-			template<typename InputIterator, typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_impl_1(
-				InputIterator first,
-				InputIterator last,
-				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
-				Args const&... args
-				)
-			{
-				return sizeof...(Args) < static_cast<std::size_t>(offset)
-					? copy_impl_1(first, last, result, offset, args..., *sprout::next(sprout::fixed_begin(result), sizeof...(Args)))
-					: copy_impl_2(first, last, result, offset + sprout::size(result), args...)
-					;
-			}
-			template<typename InputIterator, typename Result>
-			SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Result>::type copy_impl(
-				InputIterator first,
-				InputIterator last,
-				Result const& result
-				)
-			{
-				return copy_impl_1(first, last, result, sprout::fixed_begin_offset(result));
-			}
 			template<typename InputIterator, typename Result>
 			SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Result>::type copy(
 				InputIterator first,
@@ -157,7 +96,8 @@ namespace sprout {
 				return sprout::fixed::detail::copy_impl(
 					first,
 					last,
-					result
+					result,
+					sprout::size(result)
 					);
 			}
 		}	// namespace detail
diff --git a/sprout/algorithm/fixed/copy_backward.hpp b/sprout/algorithm/fixed/copy_backward.hpp
index 9f241386..33390019 100644
--- a/sprout/algorithm/fixed/copy_backward.hpp
+++ b/sprout/algorithm/fixed/copy_backward.hpp
@@ -10,6 +10,7 @@
 #include <sprout/fixed_container/functions.hpp>
 #include <sprout/iterator/operation.hpp>
 #include <sprout/algorithm/fixed/result_of.hpp>
+#include <sprout/detail/container_complate_backward.hpp>
 #include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT_DETAIL
 
 namespace sprout {
@@ -53,37 +54,15 @@ namespace sprout {
 					NS_SSCRISK_CEL_OR_SPROUT_DETAIL::distance(first, last)
 					);
 			}
-			template<typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_backward_impl_3(
-				Result const& result,
-				Args const&... args
-				)
-			{
-				return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
-			}
-			template<typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_backward_impl_3(
-				Result const& result,
-				Args const&... args
-				)
-			{
-				return copy_backward_impl_3(result, *sprout::prev(sprout::fixed_end(result), sizeof...(Args) + 1), args...);
-			}
 			template<typename BidirectionalIterator, typename Result, typename... Args>
 			SPROUT_CONSTEXPR inline typename std::enable_if<
 				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_backward_impl_2(
+			>::type copy_backward_impl(
 				BidirectionalIterator first,
 				BidirectionalIterator last,
 				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
+				typename sprout::fixed_container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
@@ -93,59 +72,19 @@ namespace sprout {
 			SPROUT_CONSTEXPR inline typename std::enable_if<
 				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_backward_impl_2(
+			>::type copy_backward_impl(
 				BidirectionalIterator first,
 				BidirectionalIterator last,
 				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
+				typename sprout::fixed_container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
-				return first != last && sizeof...(Args) < static_cast<std::size_t>(offset)
-					? copy_backward_impl_2(first, sprout::prev(last), result, offset, *sprout::prev(last), args...)
-					: copy_backward_impl_3(result, args...)
+				return first != last && sizeof...(Args) < size
+					? copy_backward_impl(first, sprout::prev(last), result, size, *sprout::prev(last), args...)
+					: sprout::detail::container_complate_backward(result, args...)
 					;
 			}
-			template<typename BidirectionalIterator, typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_backward_impl_1(
-				BidirectionalIterator first,
-				BidirectionalIterator last,
-				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
-				Args const&... args
-				)
-			{
-				return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
-			}
-			template<typename BidirectionalIterator, typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type copy_backward_impl_1(
-				BidirectionalIterator first,
-				BidirectionalIterator last,
-				Result const& result,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
-				Args const&... args
-				)
-			{
-				return sizeof...(Args) < static_cast<std::size_t>(offset)
-					? copy_backward_impl_1(first, last, result, offset, *sprout::prev(sprout::fixed_end(result), sizeof...(Args) + 1), args...)
-					: copy_backward_impl_2(first, last, result, offset + sprout::size(result), args...)
-					;
-			}
-			template<typename BidirectionalIterator, typename Result>
-			SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Result>::type copy_backward_impl(
-				BidirectionalIterator first,
-				BidirectionalIterator last,
-				Result const& result
-				)
-			{
-				return copy_backward_impl_1(first, last, result, sprout::fixed_end_offset(result));
-			}
 			template<typename BidirectionalIterator, typename Result>
 			SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Result>::type copy_backward(
 				BidirectionalIterator first,
@@ -157,7 +96,8 @@ namespace sprout {
 				return sprout::fixed::detail::copy_backward_impl(
 					first,
 					last,
-					result
+					result,
+					sprout::size(result)
 					);
 			}
 		}	// namespace detail
diff --git a/sprout/algorithm/fixed/partition_copy.hpp b/sprout/algorithm/fixed/partition_copy.hpp
index 1a2b2c4f..c27f9e17 100644
--- a/sprout/algorithm/fixed/partition_copy.hpp
+++ b/sprout/algorithm/fixed/partition_copy.hpp
@@ -8,42 +8,21 @@
 #include <sprout/fixed_container/functions.hpp>
 #include <sprout/iterator/operation.hpp>
 #include <sprout/algorithm/fixed/result_of.hpp>
+#include <sprout/detail/container_complate.hpp>
 
 namespace sprout {
 	namespace fixed {
 		namespace detail {
-			template<typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type partition_copy_impl_3(
-				Result const& result,
-				Args const&... args
-				)
-			{
-				return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
-			}
-			template<typename Result, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type partition_copy_impl_3(
-				Result const& result,
-				Args const&... args
-				)
-			{
-				return partition_copy_impl_3(result, args..., *sprout::next(sprout::fixed_begin(result), sizeof...(Args)));
-			}
 			template<typename InputIterator, typename Result, typename Predicate, typename... Args>
 			SPROUT_CONSTEXPR inline typename std::enable_if<
 				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type partition_copy_impl_2(
+			>::type partition_copy_impl(
 				InputIterator first,
 				InputIterator last,
 				Result const& result,
 				Predicate pred,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
+				typename sprout::fixed_container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
@@ -53,65 +32,22 @@ namespace sprout {
 			SPROUT_CONSTEXPR inline typename std::enable_if<
 				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
 				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type partition_copy_impl_2(
+			>::type partition_copy_impl(
 				InputIterator first,
 				InputIterator last,
 				Result const& result,
 				Predicate pred,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
+				typename sprout::fixed_container_traits<Result>::size_type size,
 				Args const&... args
 				)
 			{
-				return first != last && sizeof...(Args) < static_cast<std::size_t>(offset)
+				return first != last && sizeof...(Args) < size
 					? pred(*first)
-						? partition_copy_impl_2(sprout::next(first), last, result, pred, offset, *first, args...)
-						: partition_copy_impl_2(sprout::next(first), last, result, pred, offset, args..., *first)
-					: partition_copy_impl_3(result, args...)
+						? sprout::fixed::detail::partition_copy_impl(sprout::next(first), last, result, pred, size, *first, args...)
+						: sprout::fixed::detail::partition_copy_impl(sprout::next(first), last, result, pred, size, args..., *first)
+					: sprout::detail::container_complate(result, args...)
 					;
 			}
-			template<typename InputIterator, typename Result, typename Predicate, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type partition_copy_impl_1(
-				InputIterator first,
-				InputIterator last,
-				Result const& result,
-				Predicate pred,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
-				Args const&... args
-				)
-			{
-				return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
-			}
-			template<typename InputIterator, typename Result, typename Predicate, typename... Args>
-			SPROUT_CONSTEXPR inline typename std::enable_if<
-				sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
-				typename sprout::fixed::result_of::algorithm<Result>::type
-			>::type partition_copy_impl_1(
-				InputIterator first,
-				InputIterator last,
-				Result const& result,
-				Predicate pred,
-				typename sprout::fixed_container_traits<Result>::difference_type offset,
-				Args const&... args
-				)
-			{
-				return sizeof...(Args) < static_cast<std::size_t>(offset)
-					? partition_copy_impl_1(first, last, result, pred, offset, args..., *sprout::next(sprout::fixed_begin(result), sizeof...(Args)))
-					: partition_copy_impl_2(first, last, result, pred, offset + sprout::size(result), args...)
-					;
-			}
-			template<typename InputIterator, typename Result, typename Predicate>
-			SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Result>::type partition_copy_impl(
-				InputIterator first,
-				InputIterator last,
-				Result const& result,
-				Predicate pred
-				)
-			{
-				return partition_copy_impl_1(first, last, result, pred, sprout::fixed_begin_offset(result));
-			}
 		}	// namespace detail
 		//
 		// partition_copy
@@ -124,7 +60,13 @@ namespace sprout {
 			Predicate pred
 			)
 		{
-			return sprout::fixed::detail::partition_copy_impl(first, last, result, pred);
+			return sprout::fixed::detail::partition_copy_impl(
+				first,
+				last,
+				result,
+				pred,
+				sprout::size(result)
+				);
 		}
 	}	// namespace fixed
 
diff --git a/sprout/detail/algorithm.hpp b/sprout/detail/algorithm.hpp
index 5cffac09..a55d0c1b 100644
--- a/sprout/detail/algorithm.hpp
+++ b/sprout/detail/algorithm.hpp
@@ -34,11 +34,11 @@ namespace sprout {
 		//
 		// count
 		//
-		template<typename Iterator, typename T>
-		SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type count(
-			Iterator first,
-			Iterator last,
-			T const & value
+		template<typename InputIterator, typename T>
+		SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type count(
+			InputIterator first,
+			InputIterator last,
+			T const& value
 			)
 		{
 			return first == last
@@ -50,26 +50,27 @@ namespace sprout {
 		//
 		// count_if
 		//
-		template<typename Iterator, typename Predicate>
-		SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type count_if(
-			Iterator first,
-			Iterator last,
+		template<typename InputIterator, typename Predicate>
+		SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type count_if(
+			InputIterator first,
+			InputIterator last,
 			Predicate pred
 			)
 		{
 			return first == last
 				? 0
-				: (pred(*first) ? 1 : 0) + sprout::detail::count_if(sprout::next(first), last, pred);
+				: (pred(*first) ? 1 : 0) + sprout::detail::count_if(sprout::next(first), last, pred)
+				;
 		}
 
 		//
 		// equal
 		//
-		template<typename Iterator1, typename Iterator2>
+		template<typename InputIterator1, typename InputIterator2>
 		SPROUT_CONSTEXPR bool equal(
-			Iterator1 first1,
-			Iterator1 last1,
-			Iterator2 first2
+			InputIterator1 first1,
+			InputIterator1 last1,
+			InputIterator2 first2
 			)
 		{
 			return first1 == last1
@@ -77,28 +78,29 @@ namespace sprout {
 				: *first1 == *first2 && sprout::detail::equal(sprout::next(first1), last1, sprout::next(first2))
 				;
 		}
-		template<typename Iterator1, typename Iterator2, typename Predicate>
+		template<typename InputIterator1, typename InputIterator2, typename Predicate>
 		SPROUT_CONSTEXPR bool equal(
-			Iterator1 first1,
-			Iterator1 last1,
-			Iterator2 first2,
+			InputIterator1 first1,
+			InputIterator1 last1,
+			InputIterator2 first2,
 			Predicate pred
 			)
 		{
 			return first1 == last1
 				? true
-				: pred(*first1, *first2) && sprout::detail::equal(sprout::next(first1), last1, sprout::next(first2), pred);
+				: pred(*first1, *first2) && sprout::detail::equal(sprout::next(first1), last1, sprout::next(first2), pred)
+				;
 		}
 
 		//
 		// lexicographical_compare
 		//
-		template<typename Iterator1, typename Iterator2>
+		template<typename InputIterator1, typename InputIterator2>
 		SPROUT_CONSTEXPR bool lexicographical_compare(
-			Iterator1 first1,
-			Iterator1 last1,
-			Iterator2 first2,
-			Iterator2 last2
+			InputIterator1 first1,
+			InputIterator1 last1,
+			InputIterator2 first2,
+			InputIterator2 last2
 			)
 		{
 			return first2 == last2
@@ -107,14 +109,15 @@ namespace sprout {
 				? true
 				: *first2 < *first1
 				? false
-				: sprout::detail::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2);
+				: sprout::detail::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2)
+				;
 		}
-		template<typename Iterator1, typename Iterator2, typename Compare>
+		template<typename InputIterator1, typename InputIterator2, typename Compare>
 		SPROUT_CONSTEXPR bool lexicographical_compare(
-			Iterator1 first1,
-			Iterator1 last1,
-			Iterator2 first2,
-			Iterator2 last2,
+			InputIterator1 first1,
+			InputIterator1 last1,
+			InputIterator2 first2,
+			InputIterator2 last2,
 			Compare comp
 			)
 		{
@@ -124,14 +127,15 @@ namespace sprout {
 				? true
 				: comp(*first2, *first1)
 				? false
-				: sprout::detail::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2, comp);
+				: sprout::detail::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2, comp)
+				;
 		}
 
 		//
 		// find
 		//
-		template<typename Iterator, typename T>
-		SPROUT_CONSTEXPR Iterator find(Iterator first, Iterator last, T const& value) {
+		template<typename InputIterator, typename T>
+		SPROUT_CONSTEXPR InputIterator find(InputIterator first, InputIterator last, T const& value) {
 			return first == last || *first == value
 				? first
 				: sprout::detail::find(sprout::next(first), last, value)
diff --git a/sprout/detail/algorithm_ext.hpp b/sprout/detail/algorithm_ext.hpp
new file mode 100644
index 00000000..58db22b1
--- /dev/null
+++ b/sprout/detail/algorithm_ext.hpp
@@ -0,0 +1,44 @@
+#ifndef SPROUT_DETAIL_ALGORITHM_EXT_HPP
+#define SPROUT_DETAIL_ALGORITHM_EXT_HPP
+
+#include <iterator>
+#include <sprout/config.hpp>
+#include <sprout/iterator/operation.hpp>
+
+namespace sprout {
+	namespace detail {
+		//
+		// count_n
+		//
+		template<typename InputIterator, typename Size, typename T>
+		SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type count_n(
+			InputIterator first,
+			Size n,
+			T const& value
+			)
+		{
+			return n == 0
+				? 0
+				: (*first == value ? 1 : 0) + sprout::detail::count_n(sprout::next(first), n - 1, value)
+				;
+		}
+
+		//
+		// count_n_if
+		//
+		template<typename InputIterator, typename Size, typename Predicate>
+		SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type count_n_if(
+			InputIterator first,
+			Size n,
+			Predicate pred
+			)
+		{
+			return n == 0
+				? 0
+				: (pred(*first) ? 1 : 0) + sprout::detail::count_n_if(sprout::next(first), n - 1, pred)
+				;
+		}
+	}	// namespace detail
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_DETAIL_ALGORITHM_EXT_HPP
diff --git a/sprout/detail/container_complate.hpp b/sprout/detail/container_complate.hpp
new file mode 100644
index 00000000..d67b087e
--- /dev/null
+++ b/sprout/detail/container_complate.hpp
@@ -0,0 +1,87 @@
+#ifndef SPROUT_DETAIL_CONTAINER_COMPLATE_HPP
+#define SPROUT_DETAIL_CONTAINER_COMPLATE_HPP
+
+#include <type_traits>
+#include <sprout/config.hpp>
+#include <sprout/fixed_container/traits.hpp>
+#include <sprout/fixed_container/functions.hpp>
+#include <sprout/iterator/operation.hpp>
+#include <sprout/algorithm/fixed/result_of.hpp>
+
+namespace sprout {
+	namespace detail {
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_2(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_2(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return container_complate_2(result, args..., *sprout::next(sprout::fixed_begin(result), sizeof...(Args)));
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_1(
+			Result const& result,
+			typename sprout::fixed_container_traits<Result>::difference_type remain,
+			Args const&... args
+			)
+		{
+			return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_1(
+			Result const& result,
+			typename sprout::fixed_container_traits<Result>::difference_type remain,
+			Args const&... args
+			)
+		{
+			return remain != 0
+				? container_complate_1(result, remain - 1, *sprout::next(sprout::fixed_begin(result), remain - 1), args...)
+				: container_complate_2(result, args...)
+				;
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return container_complate_1(result, sprout::fixed_begin_offset(result), args...);
+		}
+	}	// namespace detail
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_DETAIL_CONTAINER_COMPLATE_HPP
diff --git a/sprout/detail/container_complate_backward.hpp b/sprout/detail/container_complate_backward.hpp
new file mode 100644
index 00000000..23174f1a
--- /dev/null
+++ b/sprout/detail/container_complate_backward.hpp
@@ -0,0 +1,87 @@
+#ifndef SPROUT_DETAIL_CONTAINER_COMPLATE_BACKWARD_HPP
+#define SPROUT_DETAIL_CONTAINER_COMPLATE_BACKWARD_HPP
+
+#include <type_traits>
+#include <sprout/config.hpp>
+#include <sprout/fixed_container/traits.hpp>
+#include <sprout/fixed_container/functions.hpp>
+#include <sprout/iterator/operation.hpp>
+#include <sprout/algorithm/fixed/result_of.hpp>
+
+namespace sprout {
+	namespace detail {
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_backward_2(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_backward_2(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return container_complate_backward_2(result, *sprout::prev(sprout::fixed_end(result), sizeof...(Args) + 1), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_backward_1(
+			Result const& result,
+			typename sprout::fixed_container_traits<Result>::difference_type remain,
+			Args const&... args
+			)
+		{
+			return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_backward_1(
+			Result const& result,
+			typename sprout::fixed_container_traits<Result>::difference_type remain,
+			Args const&... args
+			)
+		{
+			return remain != 0
+				? container_complate_backward_1(result, remain - 1, args..., *sprout::prev(sprout::fixed_end(result), remain))
+				: container_complate_backward_2(result, args...)
+				;
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size == sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_backward(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return sprout::remake_clone<Result, Result>(result, sprout::size(result), args...);
+		}
+		template<typename Result, typename... Args>
+		SPROUT_CONSTEXPR inline typename std::enable_if<
+			sprout::fixed_container_traits<Result>::fixed_size != sizeof...(Args),
+			typename sprout::fixed::result_of::algorithm<Result>::type
+		>::type container_complate_backward(
+			Result const& result,
+			Args const&... args
+			)
+		{
+			return container_complate_backward_1(result, sprout::fixed_end_offset_backward(result), args...);
+		}
+	}	// namespace detail
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_DETAIL_CONTAINER_COMPLATE_BACKWARD_HPP
diff --git a/sprout/fixed_container/fixed_begin_offset_backward.hpp b/sprout/fixed_container/fixed_begin_offset_backward.hpp
new file mode 100644
index 00000000..13181a50
--- /dev/null
+++ b/sprout/fixed_container/fixed_begin_offset_backward.hpp
@@ -0,0 +1,20 @@
+#ifndef SPROUT_FIXED_CONTAINER_FIXED_BEGIN_OFFSET_BACKWARD_HPP
+#define SPROUT_FIXED_CONTAINER_FIXED_BEGIN_OFFSET_BACKWARD_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/fixed_container/traits.hpp>
+#include <sprout/fixed_container/begin.hpp>
+#include <sprout/fixed_container/fixed_end.hpp>
+#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT_DETAIL
+
+namespace sprout {
+	//
+	// fixed_begin_offset_backward
+	//
+	template<typename Range>
+	SPROUT_CONSTEXPR typename sprout::fixed_container_traits<Range>::difference_type fixed_begin_offset_backward(Range const& range) {
+		return NS_SSCRISK_CEL_OR_SPROUT_DETAIL::distance(sprout::begin(range), sprout::fixed_end(range));
+	}
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_FIXED_CONTAINER_FIXED_BEGIN_OFFSET_BACKWARD_HPP
diff --git a/sprout/fixed_container/fixed_end_offset_backward.hpp b/sprout/fixed_container/fixed_end_offset_backward.hpp
new file mode 100644
index 00000000..de7a301f
--- /dev/null
+++ b/sprout/fixed_container/fixed_end_offset_backward.hpp
@@ -0,0 +1,20 @@
+#ifndef SPROUT_FIXED_CONTAINER_FIXED_END_OFFSET_BACKWARD_HPP
+#define SPROUT_FIXED_CONTAINER_FIXED_END_OFFSET_BACKWARD_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/fixed_container/traits.hpp>
+#include <sprout/fixed_container/end.hpp>
+#include <sprout/fixed_container/fixed_end.hpp>
+#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT_DETAIL
+
+namespace sprout {
+	//
+	// fixed_end_offset_backward
+	//
+	template<typename Range>
+	SPROUT_CONSTEXPR typename sprout::fixed_container_traits<Range>::difference_type fixed_end_offset_backward(Range const& range) {
+		return NS_SSCRISK_CEL_OR_SPROUT_DETAIL::distance(sprout::end(range), sprout::fixed_end(range));
+	}
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_FIXED_CONTAINER_FIXED_END_OFFSET_BACKWARD_HPP
diff --git a/sprout/fixed_container/functions.hpp b/sprout/fixed_container/functions.hpp
index 40d4e42a..1311ceec 100644
--- a/sprout/fixed_container/functions.hpp
+++ b/sprout/fixed_container/functions.hpp
@@ -10,6 +10,8 @@
 #include <sprout/fixed_container/fixed_end.hpp>
 #include <sprout/fixed_container/fixed_begin_offset.hpp>
 #include <sprout/fixed_container/fixed_end_offset.hpp>
+#include <sprout/fixed_container/fixed_begin_offset_backward.hpp>
+#include <sprout/fixed_container/fixed_end_offset_backward.hpp>
 #include <sprout/fixed_container/get_fixed.hpp>
 #include <sprout/fixed_container/clone.hpp>
 #include <sprout/fixed_container/make_clone.hpp>