diff --git a/libs/tuple/test/tuple.cpp b/libs/tuple/test/tuple.cpp
index 192677de..0c8d9baf 100644
--- a/libs/tuple/test/tuple.cpp
+++ b/libs/tuple/test/tuple.cpp
@@ -10,6 +10,7 @@
 
 #include <sstream>
 #include <sprout/tuple/tuple.hpp>
+#include <sprout/utility/pair.hpp>
 #include <testspr/tools.hpp>
 
 namespace testspr {
@@ -92,6 +93,18 @@ namespace testspr {
 				TESTSPR_ASSERT(sprout::tuples::get<0>(tup3) == 1);
 				TESTSPR_ASSERT(sprout::tuples::get<1>(tup3) == 1.0);
 			}
+			{
+				auto tup3 = tup2;
+				tup3 = sprout::pair<int, double>(1, 1.0);
+				TESTSPR_ASSERT(sprout::tuples::get<0>(tup3) == 1);
+				TESTSPR_ASSERT(sprout::tuples::get<1>(tup3) == 1.0);
+			}
+			{
+				auto tup3 = tup2;
+				tup3 = sprout::pair<long, float>(1l, 1.0f);
+				TESTSPR_ASSERT(sprout::tuples::get<0>(tup3) == 1);
+				TESTSPR_ASSERT(sprout::tuples::get<1>(tup3) == 1.0);
+			}
 
 			// swap
 			{
diff --git a/sprout/cstdlib/str_to_float.hpp b/sprout/cstdlib/str_to_float.hpp
index d1ed165a..07f4c422 100644
--- a/sprout/cstdlib/str_to_float.hpp
+++ b/sprout/cstdlib/str_to_float.hpp
@@ -241,15 +241,13 @@ namespace sprout {
 		inline SPROUT_CONSTEXPR FloatType
 		str_to_float(CStrIterator str, CharPtr* endptr) {
 			return !endptr ? sprout::detail::str_to_float<FloatType>(str)
-#ifdef __MINGW32__
-				: std::is_same<typename std::remove_cv<FloatType>::type, float>::value ? strtof(&*str, endptr)
+#if defined(__MINGW32__)
+				: std::is_same<typename std::remove_cv<FloatType>::type, float>::value ? ::strtof(&*str, endptr)
+				: std::is_same<typename std::remove_cv<FloatType>::type, double>::value ? std::strtod(&*str, endptr)
+				: ::strtold(&*str, endptr)
 #else
 				: std::is_same<typename std::remove_cv<FloatType>::type, float>::value ? std::strtof(&*str, endptr)
-#endif
 				: std::is_same<typename std::remove_cv<FloatType>::type, double>::value ? std::strtod(&*str, endptr)
-#ifdef __MINGW32__
-				: strtold(&*str, endptr)
-#else
 				: std::strtold(&*str, endptr)
 #endif
 				;
diff --git a/sprout/cstdlib/str_to_int.hpp b/sprout/cstdlib/str_to_int.hpp
index 4c2893f8..3b8db4f5 100644
--- a/sprout/cstdlib/str_to_int.hpp
+++ b/sprout/cstdlib/str_to_int.hpp
@@ -99,31 +99,29 @@ namespace sprout {
 		template<typename IntType, typename CStrIterator, typename CharPtr>
 		inline SPROUT_CONSTEXPR IntType
 		str_to_int(CStrIterator str, CharPtr* endptr, int base) {
-#if defined(_MSC_VER)
 			return !endptr ? sprout::detail::str_to_int<IntType>(str, base)
+#if defined(_MSC_VER)
 				: std::is_signed<IntType>::value
 					? static_cast<IntType>(std::strtol(&*str, endptr, base))
 					: static_cast<IntType>(std::strtoul(&*str, endptr, base))
-				;
-#else
-			return !endptr ? sprout::detail::str_to_int<IntType>(str, base)
+#elif defined(__MINGW32__)
 				: std::is_signed<IntType>::value
 					? sizeof(IntType) <= sizeof(long) ? static_cast<IntType>(std::strtol(&*str, endptr, base))
-#ifdef __MINGW32__
-						: sizeof(IntType) <= sizeof(long long) ? static_cast<IntType>(strtoll(&*str, endptr, base))
-#else
-						: sizeof(IntType) <= sizeof(long long) ? static_cast<IntType>(std::strtoll(&*str, endptr, base))
-#endif
+						: sizeof(IntType) <= sizeof(long long) ? static_cast<IntType>(::strtoll(&*str, endptr, base))
 						: static_cast<IntType>(std::strtoimax(&*str, endptr, base))
 					: sizeof(IntType) <= sizeof(unsigned long) ? static_cast<IntType>(std::strtoul(&*str, endptr, base))
-#ifdef __MINGW32__
-						: sizeof(IntType) <= sizeof(unsigned long long) ? static_cast<IntType>(strtoull(&*str, endptr, base))
-#else
-						: sizeof(IntType) <= sizeof(unsigned long long) ? static_cast<IntType>(std::strtoull(&*str, endptr, base))
-#endif
+						: sizeof(IntType) <= sizeof(unsigned long long) ? static_cast<IntType>(::strtoull(&*str, endptr, base))
+						: static_cast<IntType>(std::strtoumax(&*str, endptr, base))
+#else
+				: std::is_signed<IntType>::value
+					? sizeof(IntType) <= sizeof(long) ? static_cast<IntType>(std::strtol(&*str, endptr, base))
+						: sizeof(IntType) <= sizeof(long long) ? static_cast<IntType>(std::strtoll(&*str, endptr, base))
+						: static_cast<IntType>(std::strtoimax(&*str, endptr, base))
+					: sizeof(IntType) <= sizeof(unsigned long) ? static_cast<IntType>(std::strtoul(&*str, endptr, base))
+						: sizeof(IntType) <= sizeof(unsigned long long) ? static_cast<IntType>(std::strtoull(&*str, endptr, base))
 						: static_cast<IntType>(std::strtoumax(&*str, endptr, base))
-				;
 #endif
+				;
 		}
 	}	// namespace detail
 
diff --git a/sprout/static_assert.hpp b/sprout/static_assert.hpp
new file mode 100644
index 00000000..17ee7ece
--- /dev/null
+++ b/sprout/static_assert.hpp
@@ -0,0 +1,26 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  Distributed under the Boost Software License, Version 1.0. (See accompanying
+  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#ifndef SPROUT_STATIC_ASSERT_HPP
+#define SPROUT_STATIC_ASSERT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/preprocessor/stringize.hpp>
+
+//
+// SPROUT_STATIC_ASSERT_MSG
+// SPROUT_STATIC_ASSERT
+// SPROUT_STATIC_ASSERT_PREPROCESSED
+//
+#define SPROUT_STATIC_ASSERT_MSG(COND, MESSAGE) \
+	static_assert(COND, MESSAGE)
+#define SPROUT_STATIC_ASSERT(COND) \
+	SPROUT_STATIC_ASSERT_MSG(COND, #COND)
+#define SPROUT_STATIC_ASSERT_PREPROCESSED(COND) \
+	SPROUT_STATIC_ASSERT_MSG(COND, #COND " \n[[preprocessed]]: " SPROUT_PP_STRINGIZE(COND))
+
+#endif	// #ifndef SPROUT_STATIC_ASSERT_HPP
diff --git a/sprout/static_warning.hpp b/sprout/static_warning.hpp
new file mode 100644
index 00000000..6da4f6ef
--- /dev/null
+++ b/sprout/static_warning.hpp
@@ -0,0 +1,49 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  Distributed under the Boost Software License, Version 1.0. (See accompanying
+  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#ifndef SPROUT_STATIC_WARNING_HPP
+#define SPROUT_STATIC_WARNING_HPP
+
+#include <sprout/config.hpp>
+
+namespace sprout {
+	//
+	// static_warning
+	//
+	template<bool C>
+	struct static_warning;
+	template<>
+	struct static_warning<true> {
+		template<typename Message>
+		static void warn() {}
+	};
+	template <>
+	struct static_warning<false> {
+		template<typename Message>
+		static void warn() {
+			Message static_warning_failed;
+		}
+	};
+}	// namespace sprout
+
+//
+// SPROUT_STATIC_WARNING
+//
+#define SPROUT_STATIC_WARNING_IMPL_2(cond, msg, line) \
+	struct sprout_static_warning_line_ ## line { \
+		struct msg {}; \
+		sprout_static_warning_line_ ## line() { \
+			::sprout::static_warning<(cond)>:: \
+				warn<void***** (msg::*****)()>(); \
+		} \
+	}
+#define SPROUT_STATIC_WARNING_IMPL(cond, msg) \
+	SPROUT_STATIC_WARNING_IMPL_2(cond, msg, __LINE__)
+#define SPROUT_STATIC_WARNING(cond) \
+	SPROUT_STATIC_WARNING_IMPL(cond, static_warning_failed)
+
+#endif	// #ifndef SPROUT_STATIC_WARNING_HPP
diff --git a/sprout/string/to_string_value.hpp b/sprout/string/to_string_value.hpp
index bde1b6d4..aac08ce2 100644
--- a/sprout/string/to_string_value.hpp
+++ b/sprout/string/to_string_value.hpp
@@ -16,9 +16,8 @@
 namespace sprout {
 	//
 	// to_string_value
-	//	[[deprecated]]
 	//
-	struct SPROUT_DEPRECATED to_string_value {
+	struct to_string_value {
 	public:
 		template<typename T>
 		SPROUT_CONSTEXPR decltype(sprout::to_string(std::declval<T>()))
diff --git a/sprout/tuple/tuple/tuple.hpp b/sprout/tuple/tuple/tuple.hpp
index 7e08771e..b4f4c685 100644
--- a/sprout/tuple/tuple/tuple.hpp
+++ b/sprout/tuple/tuple/tuple.hpp
@@ -53,6 +53,29 @@ namespace sprout {
 		inline SPROUT_CONSTEXPR sprout::tuples::tuple<Types...>::tuple(sprout::tuples::flexibly_construct_t, sprout::pair<UType1, UType2>&& t)
 			: impl_type(SPROUT_FORWARD(UType1, t.first), SPROUT_FORWARD(UType2, t.second))
 		{}
+		// tuple assignment
+		template<typename... Types>
+		template<
+			typename UType1, typename UType2,
+			typename
+		>
+		inline SPROUT_CXX14_CONSTEXPR sprout::tuples::tuple<Types...>&
+		sprout::tuples::tuple<Types...>::operator=(sprout::pair<UType1, UType2> const& rhs) {
+			sprout::tuples::detail::tuple_impl<0, Types...>::head(*this) = rhs.first;
+			sprout::tuples::detail::tuple_impl<1, Types...>::head(*this) = rhs.second;
+			return *this;
+		}
+		template<typename... Types>
+		template<
+			typename UType1, typename UType2,
+			typename
+		>
+		inline SPROUT_CXX14_CONSTEXPR sprout::tuples::tuple<Types...>&
+		sprout::tuples::tuple<Types...>::operator=(sprout::pair<UType1, UType2>&& rhs) {
+			sprout::tuples::detail::tuple_impl<0, Types...>::head(*this) = sprout::move(rhs.first);
+			sprout::tuples::detail::tuple_impl<1, Types...>::head(*this) = sprout::move(rhs.second);
+			return *this;
+		}
 	}	// namespace tuples
 }	// namespace sprout
 
diff --git a/sprout/tuple/tuple/tuple_decl.hpp b/sprout/tuple/tuple/tuple_decl.hpp
index 56ba143d..fe710ce7 100644
--- a/sprout/tuple/tuple/tuple_decl.hpp
+++ b/sprout/tuple/tuple/tuple_decl.hpp
@@ -272,6 +272,18 @@ namespace sprout {
 					>...
 				>
 			{};
+
+			template<typename TndexTuple, typename... Utypes>
+			struct is_flexibly_assignable_impl;
+			template<sprout::index_t... Indexes, typename... Utypes>
+			struct is_flexibly_assignable_impl<sprout::index_tuple<Indexes...>, Utypes...>
+				: public sprout::tpp::all_of<
+					std::is_assignable<
+						typename sprout::pack_element<Indexes, Types...>::type,
+						typename sprout::pack_element<Indexes, Utypes...>::type
+					>...
+				>
+			{};
 		public:
 			template<typename... UTypes>
 			struct is_flexibly_convert_constructible
@@ -304,6 +316,38 @@ namespace sprout {
 			struct is_clvref_fixedly_convert_constructible
 				: public is_fixedly_convert_constructible<UTypes const&...>
 			{};
+
+			template<typename... UTypes>
+			struct is_flexibly_assignable
+				: public is_flexibly_assignable_impl<
+					typename sprout::make_index_tuple<(sizeof...(UTypes) < sizeof...(Types) ? sizeof...(UTypes) : sizeof...(Types))>::type,
+					UTypes...
+				>
+			{};
+			template<typename... UTypes>
+			struct is_rvref_flexibly_assignable
+				: public is_flexibly_assignable<UTypes&&...>
+			{};
+			template<typename... UTypes>
+			struct is_clvref_flexibly_assignable
+				: public is_flexibly_assignable<UTypes const&...>
+			{};
+
+			template<typename... UTypes>
+			struct is_fixedly_assignable
+				: public sprout::integral_constant<
+					bool,
+					(sizeof...(UTypes) == sizeof...(Types) && is_flexibly_assignable<UTypes...>::value)
+				>
+			{};
+			template<typename... UTypes>
+			struct is_rvref_fixedly_assignable
+				: public is_fixedly_assignable<UTypes&&...>
+			{};
+			template<typename... UTypes>
+			struct is_clvref_fixedly_assignable
+				: public is_fixedly_assignable<UTypes const&...>
+			{};
 		public:
 			// tuple construction
 			SPROUT_CONSTEXPR tuple()
@@ -428,6 +472,20 @@ namespace sprout {
 				static_cast<impl_type&>(*this) = sprout::move(rhs);
 				return *this;
 			}
+			template<
+				typename UType1, typename UType2,
+				typename = typename std::enable_if<
+					is_clvref_fixedly_assignable<UType1, UType2>::value
+				>::type
+			>
+			SPROUT_CXX14_CONSTEXPR tuple& operator=(sprout::pair<UType1, UType2> const& rhs);
+			template<
+				typename UType1, typename UType2,
+				typename = typename std::enable_if<
+					is_rvref_fixedly_assignable<UType1, UType2>::value
+				>::type
+			>
+			SPROUT_CXX14_CONSTEXPR tuple& operator=(sprout::pair<UType1, UType2>&& rhs);
 			// tuple swap
 			SPROUT_CXX14_CONSTEXPR void swap(tuple& other)
 			SPROUT_NOEXCEPT_EXPR(sprout::tpp::all_of_c<SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(sprout::swap(std::declval<Types&>(), std::declval<Types&>()), false)...>::value)
diff --git a/sprout/type.hpp b/sprout/type.hpp
index de17def8..842ba5c9 100644
--- a/sprout/type.hpp
+++ b/sprout/type.hpp
@@ -18,5 +18,6 @@
 #include <sprout/type/functional.hpp>
 #include <sprout/type/algorithm.hpp>
 #include <sprout/type/operation.hpp>
+#include <sprout/type/print.hpp>
 
 #endif	// #ifndef SPROUT_TYPE_HPP
diff --git a/sprout/type/print.hpp b/sprout/type/print.hpp
new file mode 100644
index 00000000..ba6cdb0a
--- /dev/null
+++ b/sprout/type/print.hpp
@@ -0,0 +1,71 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  Distributed under the Boost Software License, Version 1.0. (See accompanying
+  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#ifndef SPROUT_TYPE_PRINT_HPP
+#define SPROUT_TYPE_PRINT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/type_traits/identity.hpp>
+
+namespace sprout {
+	namespace types {
+		namespace detail {
+#if defined(_MSC_VER)
+#	pragma warning(push, 3)
+#	pragma warning(disable: 4307)
+#elif defined(__MWERKS__)
+#	pragma warn_hidevirtual on
+			struct print_base {
+				virtual void f() {}
+			};
+#endif
+
+#if defined(__EDG_VERSION__)
+			template<typename T>
+			struct dependent_unsigned {
+				static unsigned const value = 1;
+			};
+#endif
+		}	// namespace detail 
+
+		//
+		// print
+		//
+		template<typename T>
+		struct print
+			: public sprout::identity<T>
+#if defined(__MWERKS__)
+			, public sprout::types::detail::print_base
+#endif
+		{
+#if defined(_MSC_VER)
+			enum {
+				n = sizeof(T) + -1
+			};
+#elif defined(__MWERKS__)
+			void f(int);
+#else
+			enum {
+				n =
+#	if defined(__EDG_VERSION__)
+					sprout::types::detail::dependent_unsigned<T>::value > -1
+#	else
+					sizeof(T) > -1
+#	endif
+			};
+#endif
+		};
+
+#if defined(_MSC_VER)
+#	pragma warning(pop)
+#elif defined(__MWERKS__)
+#	pragma warn_hidevirtual reset
+#endif
+	}	// namespace types 
+}	// namespace sprout 
+
+#endif	// #ifndef SPROUT_TYPE_PRINT_HPP
diff --git a/testspr/assert.hpp b/testspr/assert.hpp
index f24d9dbd..d4d38ce8 100644
--- a/testspr/assert.hpp
+++ b/testspr/assert.hpp
@@ -10,10 +10,10 @@
 
 #include <string>
 #include <stdexcept>
-#ifdef TESTSPR_CONFIG_ENABLE_STATIC_WARNING
-#	include <boost/serialization/static_warning.hpp>
-#endif
 #include <sprout/assert.hpp>
+#ifdef TESTSPR_CONFIG_ENABLE_STATIC_WARNING
+#	include <sprout/static_warning.hpp>
+#endif
 
 namespace testspr {
 	//