diff --git a/sprout/functional/hash.hpp b/sprout/functional/hash.hpp
index 2d6de228..d98932d7 100644
--- a/sprout/functional/hash.hpp
+++ b/sprout/functional/hash.hpp
@@ -7,8 +7,7 @@
 #include <sprout/functional/hash/to_hash.hpp>
 #include <sprout/functional/hash/hash.hpp>
 #include <sprout/functional/hash/hash_combine.hpp>
-#include <sprout/functional/hash/hash_range.hpp>
-#include <sprout/functional/hash/hash_values_combine.hpp>
 #include <sprout/functional/hash/hash_values.hpp>
+#include <sprout/functional/hash/hash_range.hpp>
 
 #endif	// #ifndef SPROUT_FUNCTIONAL_HASH_HPP
diff --git a/sprout/functional/hash/hash_combine.hpp b/sprout/functional/hash/hash_combine.hpp
index 0cd8f1f4..36de65de 100644
--- a/sprout/functional/hash/hash_combine.hpp
+++ b/sprout/functional/hash/hash_combine.hpp
@@ -7,13 +7,30 @@
 #include <sprout/functional/hash/to_hash.hpp>
 
 namespace sprout {
+	namespace detail {
+		template<typename T>
+		inline SPROUT_CONSTEXPR std::size_t
+		hash_combine_impl(std::size_t seed) {
+			return seed;
+		}
+		template<typename T>
+		inline SPROUT_CONSTEXPR std::size_t
+		hash_combine_impl(std::size_t seed, T const& v) {
+			return seed ^ (sprout::to_hash(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2));
+		}
+		template<typename Head, typename... Tail>
+		inline SPROUT_CONSTEXPR std::size_t
+		hash_combine_impl(std::size_t seed, Head const& head, Tail const&... tail) {
+			return sprout::detail::hash_combine_impl(sprout::detail::hash_combine_impl(seed, head), tail...);
+		}
+	}	// namespace detail
 	//
 	// hash_combine
 	//
-	template<typename T>
+	template<typename... Args>
 	inline SPROUT_CONSTEXPR std::size_t
-	hash_combine(std::size_t seed, T const& v) {
-		return seed ^ (sprout::to_hash(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2));
+	hash_combine(std::size_t seed, Args const&... args) {
+		return sprout::detail::hash_combine_impl(seed, args...);
 	}
 }	// namespace sprout
 
diff --git a/sprout/functional/hash/hash_fwd.hpp b/sprout/functional/hash/hash_fwd.hpp
index 1227a3d9..05dd4f13 100644
--- a/sprout/functional/hash/hash_fwd.hpp
+++ b/sprout/functional/hash/hash_fwd.hpp
@@ -20,23 +20,9 @@ namespace sprout {
 	//
 	// hash_combine
 	//
-	template<typename T>
-	SPROUT_CONSTEXPR std::size_t hash_combine(std::size_t seed, T const& v);
-
-	//
-	// hash_range
-	//
-	template<typename Iterator>
-	SPROUT_CONSTEXPR std::size_t hash_range(Iterator first, Iterator last);
-	template<typename Iterator>
-	SPROUT_CONSTEXPR std::size_t hash_range(std::size_t seed, Iterator first, Iterator last);
-
-	//
-	// hash_values_combine
-	//
 	template<typename... Args>
 	inline SPROUT_CONSTEXPR std::size_t
-	hash_values_combine(std::size_t seed, Args const&... args);
+	hash_combine(std::size_t seed, Args const&... args);
 
 	//
 	// hash_values
@@ -44,6 +30,18 @@ namespace sprout {
 	template<typename... Args>
 	inline SPROUT_CONSTEXPR std::size_t
 	hash_values(Args const&... args);
+
+	//
+	// hash_range
+	//
+	template<typename Iterator>
+	SPROUT_CONSTEXPR std::size_t hash_range(std::size_t seed, Iterator first, Iterator last);
+	template<typename Iterator>
+	SPROUT_CONSTEXPR std::size_t hash_range(Iterator first, Iterator last);
+	template<typename InputRange>
+	SPROUT_CONSTEXPR std::size_t hash_range(std::size_t seed, InputRange const& rng);
+	template<typename InputRange>
+	SPROUT_CONSTEXPR std::size_t hash_range(InputRange const& rng);
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_FUNCTIONAL_HASH_HASH_FWD_HPP
diff --git a/sprout/functional/hash/hash_range.hpp b/sprout/functional/hash/hash_range.hpp
index 6048d1db..c11e1468 100644
--- a/sprout/functional/hash/hash_range.hpp
+++ b/sprout/functional/hash/hash_range.hpp
@@ -5,25 +5,49 @@
 #include <sprout/config.hpp>
 #include <sprout/functional/hash/hash_fwd.hpp>
 #include <sprout/functional/hash/hash_combine.hpp>
-#include <sprout/iterator/next.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/numeric/accumulate.hpp>
 
 namespace sprout {
+	//
+	// hash_combine_accumulator
+	//
+	template<typename T = std::size_t>
+	struct hash_combine_accumulator {
+	public:
+		typedef T first_argument_type;
+		typedef T result_type;
+	public:
+		template<typename U>
+		SPROUT_CONSTEXPR T operator()(T const& seed, U const& v) const {
+			return sprout::hash_combine(seed, v);
+		}
+	};
+
 	//
 	// hash_range
 	//
 	template<typename InputIterator>
 	inline SPROUT_CONSTEXPR std::size_t
 	hash_range(std::size_t seed, InputIterator first, InputIterator last) {
-		return first != last
-			? sprout::hash_range(sprout::hash_combine(seed, *first), sprout::next(first), last)
-			: seed
-			;
+		return sprout::accumulate(first, last, seed, sprout::hash_combine_accumulator<>());
 	}
 	template<typename InputIterator>
 	inline SPROUT_CONSTEXPR std::size_t
 	hash_range(InputIterator first, InputIterator last) {
 		return sprout::hash_range(0, first, last);
 	}
+
+	template<typename InputRange>
+	inline SPROUT_CONSTEXPR std::size_t
+	hash_range(std::size_t seed, InputRange const& rng) {
+		return sprout::hash_range(seed, sprout::begin(rng), sprout::end(rng));
+	}
+	template<typename InputRange>
+	inline SPROUT_CONSTEXPR std::size_t
+	hash_range(InputRange const& rng) {
+		return sprout::hash_range(0, rng);
+	}
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_FUNCTIONAL_HASH_HASH_RANGE_HPP
diff --git a/sprout/functional/hash/hash_values.hpp b/sprout/functional/hash/hash_values.hpp
index 81bcf1cc..20dac850 100644
--- a/sprout/functional/hash/hash_values.hpp
+++ b/sprout/functional/hash/hash_values.hpp
@@ -4,7 +4,7 @@
 #include <cstddef>
 #include <sprout/config.hpp>
 #include <sprout/functional/hash/hash_fwd.hpp>
-#include <sprout/functional/hash/hash_values_combine.hpp>
+#include <sprout/functional/hash/hash_combine.hpp>
 
 namespace sprout {
 	//
@@ -13,7 +13,7 @@ namespace sprout {
 	template<typename... Args>
 	inline SPROUT_CONSTEXPR std::size_t
 	hash_values(Args const&... args) {
-		return sprout::hash_values_combine(0, args...);
+		return sprout::hash_combine(0, args...);
 	}
 }	// namespace sprout
 
diff --git a/sprout/functional/hash/hash_values_combine.hpp b/sprout/functional/hash/hash_values_combine.hpp
deleted file mode 100644
index 5c6d1c11..00000000
--- a/sprout/functional/hash/hash_values_combine.hpp
+++ /dev/null
@@ -1,33 +0,0 @@
-#ifndef SPROUT_FUNCTIONAL_HASH_HASH_VALUES_COMBINE_HPP
-#define SPROUT_FUNCTIONAL_HASH_HASH_VALUES_COMBINE_HPP
-
-#include <cstddef>
-#include <sprout/config.hpp>
-#include <sprout/functional/hash/hash_fwd.hpp>
-#include <sprout/functional/hash/hash_combine.hpp>
-
-namespace sprout {
-	namespace detail {
-		template<typename T>
-		inline SPROUT_CONSTEXPR std::size_t
-		hash_values_combine_impl(std::size_t seed, T const& v) {
-			return sprout::hash_combine(seed, v);
-		}
-		template<typename Head, typename... Tail>
-		inline SPROUT_CONSTEXPR std::size_t
-		hash_values_combine_impl(std::size_t seed, Head const& head, Tail const&... tail) {
-			return sprout::detail::hash_values_combine_impl(sprout::hash_combine(seed, head), tail...);
-		}
-	}	// namespace detail
-
-	//
-	// hash_values_combine
-	//
-	template<typename... Args>
-	inline SPROUT_CONSTEXPR std::size_t
-	hash_values_combine(std::size_t seed, Args const&... args) {
-		return sprout::detail::hash_values_combine_impl(seed, args...);
-	}
-}	// namespace sprout
-
-#endif	// #ifndef SPROUT_FUNCTIONAL_HASH_HASH_VALUES_COMBINE_HPP