diff --git a/sprout/tuple/array.hpp b/sprout/tuple/array.hpp
index 102f6852..b514e5e1 100644
--- a/sprout/tuple/array.hpp
+++ b/sprout/tuple/array.hpp
@@ -27,6 +27,8 @@ namespace sprout {
 			return std::move(sprout::tuples::get<I>(t));
 		}
 	}	// namespace tuples
+
+	using sprout::tuples::get;
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_TUPLE_TUPLE_COMPARISON_HPP
diff --git a/sprout/tuple/sscrisk/cel/array.hpp b/sprout/tuple/sscrisk/cel/array.hpp
index 1cf94747..018eec1b 100644
--- a/sprout/tuple/sscrisk/cel/array.hpp
+++ b/sprout/tuple/sscrisk/cel/array.hpp
@@ -27,6 +27,8 @@ namespace sprout {
 			return std::move(sprout::tuples::get<I>(t));
 		}
 	}	// namespace tuples
+
+	using sprout::tuples::get;
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_TUPLE_SSCRISK_CEL_ARRAY_HPP
diff --git a/sprout/tuple/sscrisk/cel/utility.hpp b/sprout/tuple/sscrisk/cel/utility.hpp
new file mode 100644
index 00000000..d02cd0fe
--- /dev/null
+++ b/sprout/tuple/sscrisk/cel/utility.hpp
@@ -0,0 +1,98 @@
+#ifndef SPROUT_TUPLE_SSCRISK_CEL_UTILITY_HPP
+#define SPROUT_TUPLE_SSCRISK_CEL_UTILITY_HPP
+
+#include <cstddef>
+#include <type_traits>
+#include <sprout/config.hpp>
+#include <sprout/tuple/tuple.hpp>
+#include <sscrisk/cel/utility.hpp>
+
+namespace sprout {
+	namespace tuples {
+		//
+		// tuple_size
+		//
+		template<typename T1, typename T2>
+		struct tuple_size<sscrisk::cel::pair<T1, T2> >
+			: public std::integral_constant<std::size_t, 2>
+		{};
+
+		//
+		// tuple_element
+		//
+		namespace detail {
+			template<std::size_t I, typename T>
+			struct tuple_element_impl;
+			template<typename T1, typename T2>
+			struct tuple_element_impl<0, sscrisk::cel::pair<T1, T2> > {
+			public:
+				typedef T1 type;
+			};
+			template<typename T1, typename T2>
+			struct tuple_element_impl<1, sscrisk::cel::pair<T1, T2> > {
+			public:
+				typedef T2 type;
+			};
+		}	// namespace detail
+		template<std::size_t I, typename T1, typename T2>
+		struct tuple_element<I, sscrisk::cel::pair<T1, T2> >
+			: public sprout::tuples::detail::tuple_element_impl<I, sscrisk::cel::pair<T1, T2> >
+		{};
+
+		//
+		// get
+		//
+		namespace detail {
+			template<std::size_t I, typename T>
+			struct get_impl;
+			template<typename T1, typename T2>
+			struct get_impl<0, sscrisk::cel::pair<T1, T2> > {
+			public:
+				T1& operator()(sscrisk::cel::pair<T1, T2>& t) const {
+					return t.first;
+				}
+				T1 const& operator()(sscrisk::cel::pair<T1, T2> const& t) const {
+					return t.first;
+				}
+			};
+			template<typename T1, typename T2>
+			struct get_impl<1, sscrisk::cel::pair<T1, T2> > {
+			public:
+			public:
+				T2& operator()(sscrisk::cel::pair<T1, T2>& t) const {
+					return t.second;
+				}
+				T2 const& operator()(sscrisk::cel::pair<T1, T2> const& t) const {
+					return t.second;
+				}
+			};
+		}	// namespace detail
+		template<std::size_t I, typename T1, typename T2>
+		typename sprout::tuples::tuple_element<I, sscrisk::cel::pair<T1, T2> >::type& get(
+			sscrisk::cel::pair<T1, T2>& t
+			) SPROUT_NOEXCEPT
+		{
+			static_assert(I < 2, "get: index out of range");
+			return sprout::tuples::detail::get_impl<I, sscrisk::cel::pair<T1, T2> >()(t);
+		}
+		template<std::size_t I, typename T1, typename T2>
+		SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sscrisk::cel::pair<T1, T2> >::type const& get(
+			sscrisk::cel::pair<T1, T2> const& t
+			) SPROUT_NOEXCEPT
+		{
+			static_assert(I < 2, "get: index out of range");
+			return sprout::tuples::detail::get_impl<I, sscrisk::cel::pair<T1, T2> >()(t);
+		}
+		template<std::size_t I, typename T1, typename T2>
+		typename sprout::tuples::tuple_element<I, sscrisk::cel::pair<T1, T2> >::type&& get(
+			sscrisk::cel::pair<T1, T2>&& t
+			) SPROUT_NOEXCEPT
+		{
+			return std::move(sprout::tuples::get<I>(t));
+		}
+	}	// namespace tuples
+
+	using sprout::tuples::get;
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_TUPLE_SSCRISK_CEL_UTILITY_HPP
diff --git a/sprout/tuple/string.hpp b/sprout/tuple/string.hpp
index 9f49315f..a0d599ae 100644
--- a/sprout/tuple/string.hpp
+++ b/sprout/tuple/string.hpp
@@ -27,6 +27,8 @@ namespace sprout {
 			return std::move(sprout::tuples::get<I>(t));
 		}
 	}	// namespace tuples
+
+	using sprout::tuples::get;
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_TUPLE_STRING_HPP
diff --git a/sprout/tuple/tuple.hpp b/sprout/tuple/tuple.hpp
index 3441cf0d..d2bd9bf8 100644
--- a/sprout/tuple/tuple.hpp
+++ b/sprout/tuple/tuple.hpp
@@ -261,6 +261,18 @@ namespace sprout {
 			return sprout::tuples::tuple<Types&...>(args...);
 		}
 
+		//
+		// swap
+		//
+		template<typename... Types>
+		inline void swap(
+			sprout::tuples::tuple<Types...>& lhs,
+			sprout::tuples::tuple<Types...>& rhs
+			) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
+		{
+			lhs.swap(rhs);
+		}
+
 		namespace detail {
 			template<std::size_t I, typename T>
 			struct tuple_element_impl;
@@ -281,6 +293,7 @@ namespace sprout {
 	using sprout::tuples::make_tuple;
 	using sprout::tuples::forward_as_tuple;
 	using sprout::tuples::tie;
+	using sprout::tuples::swap;
 }	// namespace sprout
 
 namespace std {
@@ -325,7 +338,8 @@ namespace sprout {
 		template<std::size_t I, typename T>
 		SPROUT_CONSTEXPR auto get(
 			T&& t
-			) SPROUT_NOEXCEPT -> decltype(std::get<I>(sprout::forward<T>(t)))
+			) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(std::get<I>(sprout::forward<T>(t))))
+			-> decltype(std::get<I>(sprout::forward<T>(t)))
 		{
 			return std::get<I>(sprout::forward<T>(t));
 		}
@@ -371,20 +385,11 @@ namespace sprout {
 		{
 			return sprout::tuples::detail::get_helper<I>(t);
 		}
-
-		//
-		// swap
-		//
-		template<typename... Types>
-		inline void swap(tuple<Types...>& lhs, tuple<Types...>& rhs) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs))) {
-			lhs.swap(rhs);
-		}
 	}	// namespace tuples
 
 	using sprout::tuples::tuple_size;
 	using sprout::tuples::tuple_element;
 	using sprout::tuples::get;
-	using sprout::tuples::swap;
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_TUPLE_TUPLE_HPP
diff --git a/sprout/tuple/uuid.hpp b/sprout/tuple/uuid.hpp
index e6800159..2a43d1b5 100644
--- a/sprout/tuple/uuid.hpp
+++ b/sprout/tuple/uuid.hpp
@@ -27,6 +27,8 @@ namespace sprout {
 			return std::move(std::get<I>(t));
 		}
 	}	// namespace tuples
+
+	using sprout::tuples::get;
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_TUPLE_UUID_HPP