diff --git a/sprout/functional/hash/hash.hpp b/sprout/functional/hash/hash.hpp
index e2ac263a..b62983c2 100644
--- a/sprout/functional/hash/hash.hpp
+++ b/sprout/functional/hash/hash.hpp
@@ -85,11 +85,11 @@ namespace sprout {
 				);
 		}
 
-		SPROUT_CONSTEXPR inline std::size_t hash_value_pointer_1(std::size_t x) {
+		inline std::size_t hash_value_pointer_1(std::size_t x) {
 			return x + (x >> 3);
 		}
 		template<typename T>
-		SPROUT_CONSTEXPR std::size_t hash_value_pointer(T* v) {
+		std::size_t hash_value_pointer(T const* v) {
 			return sprout::hash_detail::hash_value_pointer_1(static_cast<std::size_t>(reinterpret_cast<std::ptrdiff_t>(v)));
 		}
 	}	// namespace hash_detail
@@ -145,12 +145,21 @@ namespace sprout {
 		return sprout::hash_range(&v[0], &v[0] + N);
 	}
 
+	//
+	// to_hash
+	//
+	template<typename T>
+	SPROUT_CONSTEXPR std::size_t to_hash(T const& v) {
+		using sprout::hash_value;
+		return hash_value(v);
+	}
+
 	//
 	// hash_combine
 	//
 	template<typename T>
 	SPROUT_CONSTEXPR std::size_t hash_combine(std::size_t seed, T const& v) {
-		return seed ^ (sprout::hash<T>()(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2));
+		return seed ^ (sprout::to_hash(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2));
 	}
 
 	//
@@ -178,8 +187,7 @@ namespace sprout {
 		typedef std::size_t result_type;
 	public:
 		SPROUT_CONSTEXPR std::size_t operator()(T const& v) const {
-			using sprout::hash_value;
-			return hash_value(v);
+			return sprout::to_hash(v);
 		}
 	};
 
@@ -224,16 +232,26 @@ namespace sprout {
 #undef SPROUT_HASH_SPECIALIZE_REF
 
 	template<typename T>
-	struct hash<T*> {
+	struct hash<T const> {
 	public:
-		typedef T* argument_type;
+		typedef T argument_type;
 		typedef std::size_t result_type;
 	public:
-		SPROUT_CONSTEXPR std::size_t operator()(T* v) const {
+		SPROUT_CONSTEXPR std::size_t operator()(T const& v) const {
 			using sprout::hash_value;
 			return hash_value(v);
 		}
 	};
+	template<typename T>
+	struct hash<T const*> {
+	public:
+		typedef T const* argument_type;
+		typedef std::size_t result_type;
+	public:
+		std::size_t operator()(T const* v) const {
+			return sprout::to_hash(v);
+		}
+	};
 }	//namespace sprout
 
 #endif	// #ifndef SPROUT_FUNCTIONAL_HASH_HASH_HPP
diff --git a/sprout/functional/hash/hash_fwd.hpp b/sprout/functional/hash/hash_fwd.hpp
index c442c436..2f54e6a2 100644
--- a/sprout/functional/hash/hash_fwd.hpp
+++ b/sprout/functional/hash/hash_fwd.hpp
@@ -11,6 +11,12 @@ namespace sprout {
 	template<typename T>
 	struct hash;
 
+	//
+	// to_hash
+	//
+	template<typename T>
+	SPROUT_CONSTEXPR std::size_t to_hash(T const& v);
+
 	//
 	// hash_combine
 	//
diff --git a/sprout/random/unique_seed.hpp b/sprout/random/unique_seed.hpp
index b201ab44..5d9956c1 100644
--- a/sprout/random/unique_seed.hpp
+++ b/sprout/random/unique_seed.hpp
@@ -1,22 +1,56 @@
 #ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP
 #define SPROUT_RANDOM_UNIQUE_SEED_HPP
 
-#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
-#	include <cstddef>
-#	include <type_traits>
-#endif
+#include <cstddef>
+#include <type_traits>
 #include <sprout/config.hpp>
+#include <sprout/array.hpp>
 #include <sprout/functional/hash/hash.hpp>
 #include <sprout/preprocessor/unique_string.hpp>
 
+namespace sprout {
+	//
+	// make_seed
+	//
+	template<typename T>
+	SPROUT_CONSTEXPR std::size_t make_seed(T const& v) {
+		return sprout::to_hash(v);
+	}
+
+	namespace detail {
+		template<std::size_t N, typename T, typename... Args>
+		SPROUT_CONSTEXPR typename std::enable_if<
+			sizeof...(Args) + 1 == N,
+			sprout::array<std::size_t, N>
+		>::type make_seed_seq_impl(T const& v, std::size_t seed, Args const&... args) {
+			return sprout::array<std::size_t, N>{{args..., seed}};
+		}
+		template<std::size_t N, typename T, typename... Args>
+		SPROUT_CONSTEXPR typename std::enable_if<
+			sizeof...(Args) + 1 != N,
+			sprout::array<std::size_t, N>
+		>::type make_seed_seq_impl(T const& v, std::size_t seed, Args const&... args) {
+			return sprout::detail::make_seed_seq_impl<N>(v, sprout::hash_combine(seed, v), args..., seed);
+		}
+	}	// namespace detail
+	//
+	// make_seed_seq
+	//
+	template<std::size_t N, typename T>
+	SPROUT_CONSTEXPR sprout::array<std::size_t, N> make_seed_seq(T const& v) {
+		return sprout::detail::make_seed_seq_impl<N>(v, sprout::to_hash(v));
+	}
+}	// namespace sprout
+
 //
 // SPROUT_UNIQUE_SEED
 //
-#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
-#	define SPROUT_UNIQUE_SEED (::std::integral_constant< ::std::size_t, ::sprout::hash_value(SPROUT_PP_UNIQUE_STRING)>::value)
-#else
-#	define SPROUT_UNIQUE_SEED (::sprout::hash_value(SPROUT_PP_UNIQUE_STRING))
-#endif
+#define SPROUT_UNIQUE_SEED (::sprout::make_seed(SPROUT_PP_UNIQUE_STRING))
+
+//
+// SPROUT_UNIQUE_SEED_SEQ
+//
+#define SPROUT_UNIQUE_SEED_SEQ(N) (::sprout::make_seed_seq<N>(SPROUT_PP_UNIQUE_STRING))
 
 #endif	// #ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP