diff --git a/sprout/compost/effects/superposed.hpp b/sprout/compost/effects/superposed.hpp
index 2eb093c6..e92a27d1 100644
--- a/sprout/compost/effects/superposed.hpp
+++ b/sprout/compost/effects/superposed.hpp
@@ -5,6 +5,8 @@
 #include <sprout/functional/plus.hpp>
 #include <sprout/utility/forward.hpp>
 #include <sprout/utility/value_holder.hpp>
+#include <sprout/utility/lvalue_forward.hpp>
+#include <sprout/type_traits/lvalue_reference.hpp>
 #include <sprout/range/adaptor/transformed.hpp>
 
 namespace sprout {
diff --git a/sprout/compost/formats.hpp b/sprout/compost/formats.hpp
index a292ad3f..53e3ccd8 100644
--- a/sprout/compost/formats.hpp
+++ b/sprout/compost/formats.hpp
@@ -5,5 +5,9 @@
 #include <sprout/compost/formats/as_pcm_wave.hpp>
 #include <sprout/compost/formats/left_channel.hpp>
 #include <sprout/compost/formats/right_channel.hpp>
+#include <sprout/compost/formats/stereo.hpp>
+#include <sprout/compost/formats/effected_each_cannel.hpp>
+#include <sprout/compost/formats/effected_left_cannel.hpp>
+#include <sprout/compost/formats/effected_right_cannel.hpp>
 
 #endif	// #ifndef SPROUT_COMPOST_FORMATS_HPP
diff --git a/sprout/compost/formats/effected_each_cannel.hpp b/sprout/compost/formats/effected_each_cannel.hpp
new file mode 100644
index 00000000..bb6bc4e1
--- /dev/null
+++ b/sprout/compost/formats/effected_each_cannel.hpp
@@ -0,0 +1,107 @@
+#ifndef SPROUT_COMPOST_FORMATS_EFFECTED_EACH_CHANNEL_HPP
+#define SPROUT_COMPOST_FORMATS_EFFECTED_EACH_CHANNEL_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/utility/lvalue_forward.hpp>
+#include <sprout/compost/formats/left_channel.hpp>
+#include <sprout/compost/formats/right_channel.hpp>
+#include <sprout/compost/formats/stereo.hpp>
+
+namespace sprout {
+	namespace compost {
+		namespace formats {
+			//
+			// effect_each_channel_holder
+			//
+			template<typename LAdaptor, typename RAdaptor = void>
+			class effect_each_channel_holder {
+			public:
+				typedef LAdaptor left_adaptor_type;
+				typedef RAdaptor right_adaptor_type;
+			private:
+				left_adaptor_type left_adaptor_;
+				right_adaptor_type right_adaptor_;
+			public:
+				SPROUT_CONSTEXPR effect_each_channel_holder(left_adaptor_type const& left_adaptor, right_adaptor_type const& right_adaptor)
+					: left_adaptor_(left_adaptor), right_adaptor_(right_adaptor)
+				{}
+				SPROUT_CONSTEXPR left_adaptor_type const& left_adaptor() const {
+					return left_adaptor_;
+				}
+				SPROUT_CONSTEXPR right_adaptor_type const& right_adaptor() const {
+					return right_adaptor_;
+				}
+			};
+			template<typename Adaptor>
+			class effect_each_channel_holder<Adaptor, void> {
+			public:
+				typedef Adaptor adaptor_type;
+			private:
+				adaptor_type adaptor_;
+			public:
+				explicit SPROUT_CONSTEXPR effect_each_channel_holder(adaptor_type const& adaptor)
+					: adaptor_(adaptor)
+				{}
+				SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
+					return adaptor_;
+				}
+			};
+
+			//
+			// effected_each_cannel_forwarder
+			//
+			class effected_each_cannel_forwarder {
+			public:
+				template<typename LAdaptor, typename RAdaptor>
+				SPROUT_CONSTEXPR sprout::compost::formats::effect_each_channel_holder<LAdaptor, RAdaptor>
+				operator()(LAdaptor const& left_adaptor, RAdaptor const& right_adaptor) {
+					return sprout::compost::formats::effect_each_channel_holder<LAdaptor, RAdaptor>(left_adaptor, right_adaptor);
+				}
+				template<typename Adaptor>
+				SPROUT_CONSTEXPR sprout::compost::formats::effect_each_channel_holder<Adaptor>
+				operator()(Adaptor const& adaptor) {
+					return sprout::compost::formats::effect_each_channel_holder<Adaptor>(adaptor);
+				}
+			};
+
+			//
+			// effected_each_cannel
+			//
+			namespace {
+				SPROUT_STATIC_CONSTEXPR sprout::compost::formats::effected_each_cannel_forwarder effected_each_cannel{};
+			}	// anonymous-namespace
+
+			//
+			// operator|
+			//
+			template<typename Range, typename LAdaptor, typename RAdaptor>
+			inline SPROUT_CONSTEXPR auto
+			operator|(Range&& lhs, sprout::compost::formats::effect_each_channel_holder<LAdaptor, RAdaptor> const& rhs)
+			-> decltype(
+				sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel | rhs.left_adaptor()
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel | rhs.right_adaptor())
+				)
+			{
+				return sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel | rhs.left_adaptor()
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel | rhs.right_adaptor())
+					;
+			}
+			template<typename Range, typename Adaptor>
+			inline SPROUT_CONSTEXPR auto
+			operator|(Range&& lhs, sprout::compost::formats::effect_each_channel_holder<Adaptor> const& rhs)
+			-> decltype(
+				sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel | rhs.adaptor()
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel | rhs.adaptor())
+				)
+			{
+				return sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel | rhs.adaptor()
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel | rhs.adaptor())
+					;
+			}
+		}	// namespace formats
+
+		using sprout::compost::formats::effected_each_cannel;
+	}	// namespace compost
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_COMPOST_FORMATS_EFFECTED_EACH_CHANNEL_HPP
diff --git a/sprout/compost/formats/effected_left_cannel.hpp b/sprout/compost/formats/effected_left_cannel.hpp
new file mode 100644
index 00000000..202fbf9e
--- /dev/null
+++ b/sprout/compost/formats/effected_left_cannel.hpp
@@ -0,0 +1,71 @@
+#ifndef SPROUT_COMPOST_FORMATS_EFFECTED_LEFT_CHANNEL_HPP
+#define SPROUT_COMPOST_FORMATS_EFFECTED_LEFT_CHANNEL_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/utility/lvalue_forward.hpp>
+#include <sprout/compost/formats/left_channel.hpp>
+#include <sprout/compost/formats/right_channel.hpp>
+#include <sprout/compost/formats/stereo.hpp>
+
+namespace sprout {
+	namespace compost {
+		namespace formats {
+			//
+			// effect_left_channel_holder
+			//
+			template<typename Adaptor>
+			class effect_left_channel_holder {
+			public:
+				typedef Adaptor adaptor_type;
+			private:
+				adaptor_type adaptor_;
+			public:
+				explicit SPROUT_CONSTEXPR effect_left_channel_holder(adaptor_type const& adaptor)
+					: adaptor_(adaptor)
+				{}
+				SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
+					return adaptor_;
+				}
+			};
+
+			//
+			// effected_left_cannel_forwarder
+			//
+			class effected_left_cannel_forwarder {
+			public:
+				template<typename Adaptor>
+				SPROUT_CONSTEXPR sprout::compost::formats::effect_left_channel_holder<Adaptor>
+				operator()(Adaptor const& adaptor) {
+					return sprout::compost::formats::effect_left_channel_holder<Adaptor>(adaptor);
+				}
+			};
+
+			//
+			// effected_left_cannel
+			//
+			namespace {
+				SPROUT_STATIC_CONSTEXPR sprout::compost::formats::effected_left_cannel_forwarder effected_left_cannel{};
+			}	// anonymous-namespace
+
+			//
+			// operator|
+			//
+			template<typename Range, typename Adaptor>
+			inline SPROUT_CONSTEXPR auto
+			operator|(Range&& lhs, sprout::compost::formats::effect_left_channel_holder<Adaptor> const& rhs)
+			-> decltype(
+				sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel | rhs.adaptor()
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel)
+				)
+			{
+				return sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel | rhs.adaptor()
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel)
+					;
+			}
+		}	// namespace formats
+
+		using sprout::compost::formats::effected_left_cannel;
+	}	// namespace compost
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_COMPOST_FORMATS_EFFECTED_LEFT_CHANNEL_HPP
diff --git a/sprout/compost/formats/effected_right_cannel.hpp b/sprout/compost/formats/effected_right_cannel.hpp
new file mode 100644
index 00000000..162839fe
--- /dev/null
+++ b/sprout/compost/formats/effected_right_cannel.hpp
@@ -0,0 +1,71 @@
+#ifndef SPROUT_COMPOST_FORMATS_EFFECTED_RIGHT_CHANNEL_HPP
+#define SPROUT_COMPOST_FORMATS_EFFECTED_RIGHT_CHANNEL_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/utility/lvalue_forward.hpp>
+#include <sprout/compost/formats/left_channel.hpp>
+#include <sprout/compost/formats/right_channel.hpp>
+#include <sprout/compost/formats/stereo.hpp>
+
+namespace sprout {
+	namespace compost {
+		namespace formats {
+			//
+			// effect_right_channel_holder
+			//
+			template<typename Adaptor>
+			class effect_right_channel_holder {
+			public:
+				typedef Adaptor adaptor_type;
+			private:
+				adaptor_type adaptor_;
+			public:
+				explicit SPROUT_CONSTEXPR effect_right_channel_holder(adaptor_type const& adaptor)
+					: adaptor_(adaptor)
+				{}
+				SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
+					return adaptor_;
+				}
+			};
+
+			//
+			// effected_right_cannel_forwarder
+			//
+			class effected_right_cannel_forwarder {
+			public:
+				template<typename Adaptor>
+				SPROUT_CONSTEXPR sprout::compost::formats::effect_right_channel_holder<Adaptor>
+				operator()(Adaptor const& adaptor) {
+					return sprout::compost::formats::effect_right_channel_holder<Adaptor>(adaptor);
+				}
+			};
+
+			//
+			// effected_right_cannel
+			//
+			namespace {
+				SPROUT_STATIC_CONSTEXPR sprout::compost::formats::effected_right_cannel_forwarder effected_right_cannel{};
+			}	// anonymous-namespace
+
+			//
+			// operator|
+			//
+			template<typename Range, typename Adaptor>
+			inline SPROUT_CONSTEXPR auto
+			operator|(Range&& lhs, sprout::compost::formats::effect_right_channel_holder<Adaptor> const& rhs)
+			-> decltype(
+				sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel | rhs.adaptor())
+				)
+			{
+				return sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::left_channel
+					| sprout::compost::formats::stereo(sprout::lvalue_forward<Range>(lhs) | sprout::compost::formats::right_channel | rhs.adaptor())
+					;
+			}
+		}	// namespace formats
+
+		using sprout::compost::formats::effected_right_cannel;
+	}	// namespace compost
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_COMPOST_FORMATS_EFFECTED_RIGHT_CHANNEL_HPP
diff --git a/sprout/compost/formats/stereo.hpp b/sprout/compost/formats/stereo.hpp
new file mode 100644
index 00000000..0489f844
--- /dev/null
+++ b/sprout/compost/formats/stereo.hpp
@@ -0,0 +1,22 @@
+#ifndef SPROUT_COMPOST_FORMATS_STEREO_HPP
+#define SPROUT_COMPOST_FORMATS_STEREO_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/range/adaptor/alternated.hpp>
+
+namespace sprout {
+	namespace compost {
+		namespace formats {
+			//
+			// stereo
+			//
+			namespace {
+				SPROUT_STATIC_CONSTEXPR sprout::adaptors::alternated_forwarder stereo{};
+			}	// anonymous-namespace
+		}	// namespace formats
+
+		using sprout::compost::formats::stereo;
+	}	// namespace compost
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_COMPOST_FORMATS_STEREO_HPP
diff --git a/sprout/iterator/adaptor.hpp b/sprout/iterator/adaptor.hpp
index ba4dff42..c36574c1 100644
--- a/sprout/iterator/adaptor.hpp
+++ b/sprout/iterator/adaptor.hpp
@@ -9,6 +9,7 @@
 #include <sprout/iterator/indexed_iterator.hpp>
 #include <sprout/iterator/valued_iterator.hpp>
 #include <sprout/iterator/joint_iterator.hpp>
+#include <sprout/iterator/alternate_iterator.hpp>
 #include <sprout/iterator/size_enum_iterator.hpp>
 #include <sprout/iterator/bytes_iterator.hpp>
 
diff --git a/sprout/iterator/alternate_iterator.hpp b/sprout/iterator/alternate_iterator.hpp
new file mode 100644
index 00000000..bda8c619
--- /dev/null
+++ b/sprout/iterator/alternate_iterator.hpp
@@ -0,0 +1,329 @@
+#ifndef SPROUT_ITERATOR_ALTERNATE_ITERATOR_HPP
+#define SPROUT_ITERATOR_ALTERNATE_ITERATOR_HPP
+
+#include <iterator>
+#include <utility>
+#include <type_traits>
+#include <sprout/config.hpp>
+#include <sprout/iterator/next.hpp>
+#include <sprout/iterator/prev.hpp>
+#include <sprout/iterator/distance.hpp>
+#include <sprout/iterator/type_traits/common.hpp>
+#include <sprout/utility/swap.hpp>
+#include <sprout/type_traits/arithmetic_promote.hpp>
+#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
+
+namespace sprout {
+	//
+	// alternate_iterator
+	//
+	template<typename LIterator, typename RIterator>
+	class alternate_iterator
+		: public std::iterator<
+			typename sprout::common_iterator_category<LIterator, RIterator>::type,
+			typename sprout::common_iterator_value_type<LIterator, RIterator>::type,
+			typename sprout::common_iterator_difference_type<LIterator, RIterator>::type,
+			typename sprout::common_iterator_pointer<LIterator, RIterator>::type,
+			typename sprout::common_iterator_reference<LIterator, RIterator>::type
+		>
+	{
+	public:
+		typedef LIterator iterator_type;
+		typedef RIterator iterator2_type;
+		typedef typename sprout::common_iterator_category<LIterator, RIterator>::type iterator_category;
+		typedef typename sprout::common_iterator_value_type<LIterator, RIterator>::type value_type;
+		typedef typename sprout::common_iterator_difference_type<LIterator, RIterator>::type difference_type;
+		typedef typename sprout::common_iterator_pointer<LIterator, RIterator>::type pointer;
+		typedef typename sprout::common_iterator_reference<LIterator, RIterator>::type reference;
+	protected:
+		iterator_type current1;
+		iterator2_type current2;
+		bool in_left;
+	private:
+		SPROUT_CONSTEXPR alternate_iterator advance_impl_1(difference_type n) const {
+			return alternate_iterator(sprout::next(current1, n / 2), sprout::next(current2, n / 2), n % 2);
+		}
+		SPROUT_CONSTEXPR alternate_iterator advance_impl(difference_type n) const {
+			return advance_impl_1(n + (!is_in_left() ? 1 : 0));
+		}
+		SPROUT_CONSTEXPR alternate_iterator(iterator_type it1, iterator2_type it2, bool in_left)
+			: current1(it1), current2(it2), in_left(in_left)
+		{}
+	public:
+		alternate_iterator()
+			: current1(), current2(), in_left(true)
+		{}
+		alternate_iterator(alternate_iterator const&) = default;
+		SPROUT_CONSTEXPR alternate_iterator(iterator_type it1, iterator2_type it2)
+			: current1(it1), current2(it2), in_left(true)
+		{}
+		template<typename U, typename V>
+		SPROUT_CONSTEXPR alternate_iterator(alternate_iterator<U, V> const& it)
+			: current1(it.base()), current2(it.base2()), in_left(it.is_in_left())
+		{}
+		template<typename U, typename V>
+		alternate_iterator& operator=(alternate_iterator<U, V> const& it) {
+			alternate_iterator temp(it);
+			temp.swap(*this);
+			return *this;
+		}
+		SPROUT_CONSTEXPR iterator_type base() const {
+			return current1;
+		}
+		SPROUT_CONSTEXPR iterator2_type base2() const {
+			return current2;
+		}
+		SPROUT_CONSTEXPR bool is_in_left() const {
+			return in_left;
+		}
+		SPROUT_CONSTEXPR reference operator*() const {
+			return is_in_left() ? *current1 : *current2;
+		}
+		SPROUT_CONSTEXPR pointer operator->() const {
+			return &*(*this);
+		}
+		alternate_iterator& operator++() {
+			if (is_in_left()) {
+				in_left = false;
+			} else {
+				in_left = true;
+				++current1;
+				++current2;
+			}
+			return *this;
+		}
+		alternate_iterator operator++(int) {
+			alternate_iterator result(*this);
+			if (is_in_left()) {
+				in_left = false;
+			} else {
+				in_left = true;
+				++current1;
+				++current2;
+			}
+			return result;
+		}
+		alternate_iterator& operator--() {
+			if (is_in_left()) {
+				in_left = false;
+				--current1;
+				--current2;
+			} else {
+				in_left = true;
+			}
+			return *this;
+		}
+		alternate_iterator operator--(int) {
+			alternate_iterator temp(*this);
+			if (is_in_left()) {
+				in_left = false;
+				--current1;
+				--current2;
+			} else {
+				in_left = true;
+			}
+			return temp;
+		}
+		SPROUT_CONSTEXPR alternate_iterator operator+(difference_type n) const {
+			return advance_impl(n);
+		}
+		SPROUT_CONSTEXPR alternate_iterator operator-(difference_type n) const {
+			return advance_impl(-n);
+		}
+		alternate_iterator& operator+=(difference_type n) {
+			alternate_iterator temp(*this + n);
+			temp.swap(*this);
+			return *this;
+		}
+		alternate_iterator& operator-=(difference_type n) {
+			alternate_iterator temp(*this - n);
+			temp.swap(*this);
+			return *this;
+		}
+		SPROUT_CONSTEXPR reference operator[](difference_type n) const {
+			return *(*this + n);
+		}
+		SPROUT_CONSTEXPR alternate_iterator next() const {
+			return is_in_left() ? alternate_iterator(current1, current2, false)
+				: alternate_iterator(sprout::next(current1), sprout::next(current2), true)
+				;
+		}
+		SPROUT_CONSTEXPR alternate_iterator prev() const {
+			return is_in_left() ? alternate_iterator(sprout::prev(current1), sprout::prev(current2), false)
+				: alternate_iterator(current1, current2, true)
+				;
+		}
+		void swap(alternate_iterator& other)
+		SPROUT_NOEXCEPT_EXPR(
+			SPROUT_NOEXCEPT_EXPR(sprout::swap(current1, other.current1))
+			&& SPROUT_NOEXCEPT_EXPR(sprout::swap(current2, other.current2))
+			&& SPROUT_NOEXCEPT_EXPR(sprout::swap(in_left, other.in_left))
+			)
+		{
+			sprout::swap(current1, other.current1);
+			sprout::swap(current2, other.current2);
+			sprout::swap(in_left, other.in_left);
+		}
+	};
+
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR bool operator==(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return lhs.base() == rhs.base() && (lhs.is_in_left() == rhs.is_in_left());
+	}
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR bool operator!=(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return !(lhs == rhs);
+	}
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR bool operator<(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return lhs.base() < rhs.base() || (lhs.base() == rhs.base() && lhs.is_in_left() && !rhs.is_in_left());
+	}
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR bool operator>(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return rhs < lhs;
+	}
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR bool operator<=(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return !(rhs < lhs);
+	}
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR bool operator>=(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return !(lhs < rhs);
+	}
+	template<
+		typename LIterator1, typename RIterator1,
+		typename LIterator2, typename RIterator2
+	>
+	inline SPROUT_CONSTEXPR decltype(std::declval<LIterator1>() - std::declval<LIterator2>())
+	operator-(
+		sprout::alternate_iterator<LIterator1, RIterator1> const& lhs,
+		sprout::alternate_iterator<LIterator2, RIterator2> const& rhs
+		)
+	{
+		return lhs.base() - rhs.base() + (lhs.is_in_left() ? (rhs.is_in_left() ? 0 : 1) : (rhs.is_in_left() ? 1 : 0));
+	}
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR sprout::alternate_iterator<LIterator, RIterator> operator+(
+		typename sprout::alternate_iterator<LIterator, RIterator>::difference_type n,
+		sprout::alternate_iterator<LIterator, RIterator> const& it
+		)
+	{
+		return it + n;
+	}
+
+	//
+	// make_alternate_iterator
+	//
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR sprout::alternate_iterator<LIterator, RIterator>
+	make_alternate_iterator(LIterator it1, RIterator it2) {
+		return sprout::alternate_iterator<LIterator, RIterator>(it1, it2);
+	}
+
+	//
+	// swap
+	//
+	template<typename LIterator, typename RIterator>
+	inline void
+	swap(
+		sprout::alternate_iterator<LIterator, RIterator>& lhs,
+		sprout::alternate_iterator<LIterator, RIterator>& rhs
+		)
+	SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
+	{
+		lhs.swap(rhs);
+	}
+
+	//
+	// iterator_distance
+	//
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR typename std::iterator_traits<sprout::alternate_iterator<LIterator, RIterator> >::difference_type
+	iterator_distance(
+		sprout::alternate_iterator<LIterator, RIterator> first,
+		sprout::alternate_iterator<LIterator, RIterator> last
+		)
+	{
+		return last - first;
+	}
+
+	//
+	// iterator_next
+	//
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR sprout::alternate_iterator<LIterator, RIterator>
+	iterator_next(sprout::alternate_iterator<LIterator, RIterator> const& it) {
+		return it.next();
+	}
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR sprout::alternate_iterator<LIterator, RIterator>
+	iterator_next(
+		sprout::alternate_iterator<LIterator, RIterator> const& it,
+		typename sprout::alternate_iterator<LIterator, RIterator>::difference_type n
+		)
+	{
+		return it + n;
+	}
+
+	//
+	// iterator_prev
+	//
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR sprout::alternate_iterator<LIterator, RIterator>
+	iterator_prev(sprout::alternate_iterator<LIterator, RIterator> const& it) {
+		return it.prev();
+	}
+	template<typename LIterator, typename RIterator>
+	inline SPROUT_CONSTEXPR sprout::alternate_iterator<LIterator, RIterator>
+	iterator_prev(
+		sprout::alternate_iterator<LIterator, RIterator> const& it,
+		typename sprout::alternate_iterator<LIterator, RIterator>::difference_type n
+		)
+	{
+		return it - n;
+	}
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_ITERATOR_ALTERNATE_ITERATOR_HPP
diff --git a/sprout/range/adaptor.hpp b/sprout/range/adaptor.hpp
index 8ddb79d7..fc727800 100644
--- a/sprout/range/adaptor.hpp
+++ b/sprout/range/adaptor.hpp
@@ -25,6 +25,7 @@
 #include <sprout/range/adaptor/adapted_offset.hpp>
 #include <sprout/range/adaptor/steps.hpp>
 #include <sprout/range/adaptor/jointed.hpp>
+#include <sprout/range/adaptor/alternated.hpp>
 #include <sprout/range/adaptor/deep_copied.hpp>
 #include <sprout/range/adaptor/indexed.hpp>
 #include <sprout/range/adaptor/valued.hpp>
diff --git a/sprout/range/adaptor/adapted_dropped.hpp b/sprout/range/adaptor/adapted_dropped.hpp
index 0baa42b9..03e59132 100644
--- a/sprout/range/adaptor/adapted_dropped.hpp
+++ b/sprout/range/adaptor/adapted_dropped.hpp
@@ -21,7 +21,7 @@ namespace sprout {
 			adaptor_type adaptor_;
 			difference_type distance_;
 		public:
-			explicit SPROUT_CONSTEXPR adapt_drop_holder(adaptor_type const& adaptor, difference_type distance)
+			SPROUT_CONSTEXPR adapt_drop_holder(adaptor_type const& adaptor, difference_type distance)
 				: adaptor_(adaptor), distance_(distance)
 			{}
 			SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
diff --git a/sprout/range/adaptor/adapted_dropped_end.hpp b/sprout/range/adaptor/adapted_dropped_end.hpp
index 56a90ab0..94c65313 100644
--- a/sprout/range/adaptor/adapted_dropped_end.hpp
+++ b/sprout/range/adaptor/adapted_dropped_end.hpp
@@ -21,7 +21,7 @@ namespace sprout {
 			adaptor_type adaptor_;
 			difference_type distance_;
 		public:
-			explicit SPROUT_CONSTEXPR adapt_drop_end_holder(adaptor_type const& adaptor, difference_type distance)
+			SPROUT_CONSTEXPR adapt_drop_end_holder(adaptor_type const& adaptor, difference_type distance)
 				: adaptor_(adaptor), distance_(distance)
 			{}
 			SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
diff --git a/sprout/range/adaptor/adapted_taken.hpp b/sprout/range/adaptor/adapted_taken.hpp
index 1fc85fe1..b3e0de14 100644
--- a/sprout/range/adaptor/adapted_taken.hpp
+++ b/sprout/range/adaptor/adapted_taken.hpp
@@ -21,7 +21,7 @@ namespace sprout {
 			adaptor_type adaptor_;
 			difference_type distance_;
 		public:
-			explicit SPROUT_CONSTEXPR adapt_take_holder(adaptor_type const& adaptor, difference_type distance)
+			SPROUT_CONSTEXPR adapt_take_holder(adaptor_type const& adaptor, difference_type distance)
 				: adaptor_(adaptor), distance_(distance)
 			{}
 			SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
diff --git a/sprout/range/adaptor/adapted_taken_end.hpp b/sprout/range/adaptor/adapted_taken_end.hpp
index eb609190..4cc7a819 100644
--- a/sprout/range/adaptor/adapted_taken_end.hpp
+++ b/sprout/range/adaptor/adapted_taken_end.hpp
@@ -21,7 +21,7 @@ namespace sprout {
 			adaptor_type adaptor_;
 			difference_type distance_;
 		public:
-			explicit SPROUT_CONSTEXPR adapt_take_end_holder(adaptor_type const& adaptor, difference_type distance)
+			SPROUT_CONSTEXPR adapt_take_end_holder(adaptor_type const& adaptor, difference_type distance)
 				: adaptor_(adaptor), distance_(distance)
 			{}
 			SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
diff --git a/sprout/range/adaptor/alternated.hpp b/sprout/range/adaptor/alternated.hpp
new file mode 100644
index 00000000..2a22792c
--- /dev/null
+++ b/sprout/range/adaptor/alternated.hpp
@@ -0,0 +1,151 @@
+#ifndef SPROUT_RANGE_ADAPTOR_ALTERNATED_HPP
+#define SPROUT_RANGE_ADAPTOR_ALTERNATED_HPP
+
+#include <type_traits>
+#include <sprout/config.hpp>
+#include <sprout/pit.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/iterator/next.hpp>
+#include <sprout/iterator/alternate_iterator.hpp>
+#include <sprout/range/range_container.hpp>
+#include <sprout/range/algorithm/copy.hpp>
+#include <sprout/type_traits/lvalue_reference.hpp>
+#include <sprout/utility/forward.hpp>
+#include <sprout/utility/lvalue_forward.hpp>
+#include <sprout/utility/value_holder.hpp>
+#include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT
+
+namespace sprout {
+	namespace adaptors {
+		//
+		// alternated_range
+		//
+		template<typename LRange, typename RRange>
+		class alternated_range
+			: public sprout::range::range_container<
+				sprout::alternate_iterator<
+					typename sprout::container_traits<LRange>::iterator,
+					typename sprout::container_traits<RRange>::iterator
+				>
+			>
+			, public sprout::detail::container_nosy_static_size<LRange>
+			, public sprout::detail::container_nosy_fixed_size<LRange>
+		{
+		public:
+			typedef LRange range_type;
+			typedef RRange range2_type;
+			typedef sprout::range::range_container<
+				sprout::alternate_iterator<
+					typename sprout::container_traits<LRange>::iterator,
+					typename sprout::container_traits<RRange>::iterator
+				>
+			> base_type;
+			typedef typename base_type::iterator iterator;
+		public:
+			alternated_range() = default;
+			alternated_range(alternated_range const&) = default;
+			SPROUT_CONSTEXPR alternated_range(range_type& range1, range2_type& range2)
+				: base_type(
+					iterator(sprout::begin(range1), sprout::begin(range2)),
+					iterator(
+						sprout::next(sprout::begin(range1), NS_SSCRISK_CEL_OR_SPROUT::min(sprout::size(range1), sprout::size(range2))),
+						sprout::next(sprout::begin(range2), NS_SSCRISK_CEL_OR_SPROUT::min(sprout::size(range1), sprout::size(range2)))
+						)
+					)
+			{}
+		};
+
+		//
+		// alternate_holder
+		//
+		template<typename RRange>
+		class alternate_holder {
+		public:
+			typedef RRange range2_type;
+		private:
+			sprout::value_holder<range2_type&> range_;
+		public:
+			alternate_holder() = default;
+			alternate_holder(alternate_holder const&) = default;
+			explicit SPROUT_CONSTEXPR alternate_holder(range2_type& range)
+				: range_(range)
+			{}
+			SPROUT_CONSTEXPR range2_type& range() const {
+				return range_;
+			}
+		};
+
+		//
+		// alternated_forwarder
+		//
+		class alternated_forwarder {
+		public:
+			template<typename RRange>
+			SPROUT_CONSTEXPR sprout::adaptors::alternate_holder<
+				typename std::remove_reference<typename sprout::lvalue_reference<RRange>::type>::type
+			>
+			operator()(RRange&& range) {
+				return sprout::adaptors::alternate_holder<
+					typename std::remove_reference<typename sprout::lvalue_reference<RRange>::type>::type
+				>(
+					sprout::lvalue_forward<RRange>(range)
+					);
+			}
+		};
+
+		//
+		// alternated
+		//
+		namespace {
+			SPROUT_STATIC_CONSTEXPR sprout::adaptors::alternated_forwarder alternated{};
+		}	// anonymous-namespace
+
+		//
+		// operator|
+		//
+		template<typename LRange, typename RRange>
+		inline SPROUT_CONSTEXPR sprout::adaptors::alternated_range<
+			typename std::remove_reference<typename sprout::lvalue_reference<LRange>::type>::type,
+			RRange
+		>
+		operator|(LRange&& lhs, sprout::adaptors::alternate_holder<RRange> const& rhs) {
+			return sprout::adaptors::alternated_range<
+				typename std::remove_reference<typename sprout::lvalue_reference<LRange>::type>::type,
+				RRange
+			>(
+				sprout::lvalue_forward<LRange>(lhs),
+				rhs.range()
+				);
+		}
+	}	// namespace adaptors
+
+	//
+	// container_construct_traits
+	//
+	template<typename LRange, typename RRange>
+	struct container_construct_traits<sprout::adaptors::alternated_range<LRange, RRange> > {
+	public:
+		typedef typename sprout::container_construct_traits<LRange>::copied_type copied_type;
+	public:
+		template<typename Cont>
+		static SPROUT_CONSTEXPR copied_type deep_copy(Cont&& cont) {
+			return sprout::range::fixed::copy(sprout::forward<Cont>(cont), sprout::pit<copied_type>());
+		}
+		template<typename... Args>
+		static SPROUT_CONSTEXPR copied_type make(Args&&... args) {
+			return sprout::make<copied_type>(sprout::forward<Args>(args)...);
+		}
+		template<typename Cont, typename... Args>
+		static SPROUT_CONSTEXPR copied_type remake(
+			Cont&& cont,
+			typename sprout::container_traits<sprout::adaptors::alternated_range<LRange, RRange> >::difference_type size,
+			Args&&... args
+			)
+		{
+			return sprout::remake<copied_type>(sprout::forward<Cont>(cont), size, sprout::forward<Args>(args)...);
+		}
+	};
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_ADAPTOR_ALTERNATED_HPP