diff --git a/include/boost/lexical_cast.hpp b/include/boost/lexical_cast.hpp
index c475982..4cb4041 100644
--- a/include/boost/lexical_cast.hpp
+++ b/include/boost/lexical_cast.hpp
@@ -162,6 +162,8 @@ namespace boost
 #include <boost/type_traits/is_integral.hpp>
 #include <boost/type_traits/is_arithmetic.hpp>
 #include <boost/type_traits/remove_pointer.hpp>
+#include <boost/type_traits/has_left_shift.hpp>
+#include <boost/type_traits/has_right_shift.hpp>
 #include <boost/math/special_functions/sign.hpp>
 #include <boost/math/special_functions/fpclassify.hpp>
 #include <boost/range/iterator_range_core.hpp>
@@ -171,236 +173,331 @@ namespace boost
 #endif
 
 namespace boost {
-    namespace detail // widest_char<...> (continuation)
-    {
-        struct not_a_character_type{};
 
-        template <typename CharT>
-        struct widest_char<not_a_character_type, CharT >
-        {
-            typedef CharT type;
-        };
-
-        template <typename CharT>
-        struct widest_char< CharT, not_a_character_type >
-        {
-            typedef CharT type;
-        };
-                
-        template <>
-        struct widest_char< not_a_character_type, not_a_character_type >
-        {
-            typedef char type;
-        };
-    } 
-
-    namespace detail // is_char_or_wchar<...> and stream_char<...> templates
+    namespace detail // is_char_or_wchar<...>
     {
         // returns true, if T is one of the character types
-        template <typename T>
+        template < typename T >
         struct is_char_or_wchar
         {
-            typedef ::boost::type_traits::ice_or<
-                    ::boost::is_same< T, char >::value,
+            typedef boost::type_traits::ice_or<
+                    boost::is_same< T, char >::value,
                     #ifndef BOOST_LCAST_NO_WCHAR_T
-                        ::boost::is_same< T, wchar_t >::value,
+                        boost::is_same< T, wchar_t >::value,
                     #endif
                     #ifndef BOOST_NO_CHAR16_T
-                        ::boost::is_same< T, char16_t >::value,
+                        boost::is_same< T, char16_t >::value,
                     #endif
                     #ifndef BOOST_NO_CHAR32_T
-                        ::boost::is_same< T, char32_t >::value,
+                        boost::is_same< T, char32_t >::value,
                     #endif
-                    ::boost::is_same< T, unsigned char >::value,
-                    ::boost::is_same< T, signed char >::value
+                    boost::is_same< T, unsigned char >::value,
+                    boost::is_same< T, signed char >::value
             > result_type;
 
             BOOST_STATIC_CONSTANT(bool, value = (result_type::value) );
         };
+    }
 
-        // selectors for choosing stream character type
-        // returns one of char, wchar_t, char16_t, char32_t or not_a_character_type types
-        template <typename Type>
-        struct stream_char
+    namespace detail // normalize_single_byte_char<Char>
+    {
+        // Converts signed/unsigned char to char
+        template < class Char >
+        struct normalize_single_byte_char 
         {
-            typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
-                is_char_or_wchar<Type >::value,
-                Type,
-                boost::detail::not_a_character_type
-            >::type type;
+            typedef Char type;
         };
 
         template <>
-        struct stream_char<unsigned char>
+        struct normalize_single_byte_char< signed char >
         {
             typedef char type;
         };
 
         template <>
-        struct stream_char<signed char>
+        struct normalize_single_byte_char< unsigned char >
         {
             typedef char type;
         };
+    }
 
-        template <typename CharT>
-        struct stream_char<CharT*>
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT>::type type;
-        };
+    namespace detail // deduce_character_type_later<T>
+    {
+        // Helper type, meaning that stram character for T must be deduced 
+        // at Stage 2 (See deduce_source_char<T> and deduce_target_char<T>)
+        template < class T > struct deduce_character_type_later {};
+    }
 
-        template <typename CharT>
-        struct stream_char<const CharT*>
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT>::type type;
-        };
+    namespace detail // stream_char_common<T>
+    {
+        // Selectors to choose stream character type (common for Source and Target)
+        // Returns one of char, wchar_t, char16_t, char32_t or deduce_character_type_later<T> types
+        // Executed on Stage 1 (See deduce_source_char<T> and deduce_target_char<T>)
+        template < typename Type >
+        struct stream_char_common: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Type >::value,
+            Type,
+            boost::detail::deduce_character_type_later< Type >
+        > {};
 
-        template <typename CharT>
-        struct stream_char<iterator_range<CharT*> >
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT*>::type type;
-        };
+        template < typename Char >
+        struct stream_char_common< Char* >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< Char* >
+        > {};
+
+        template < typename Char >
+        struct stream_char_common< const Char* >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< const Char* >
+        > {};
+
+        template < typename Char >
+        struct stream_char_common< boost::iterator_range< Char* > >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::iterator_range< Char* > >
+        > {};
     
-        template <typename CharT>
-        struct stream_char<iterator_range<const CharT*> >
+        template < typename Char >
+        struct stream_char_common< boost::iterator_range< const Char* > >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::iterator_range< const Char* > >
+        > {};
+
+        template < class Char, class Traits, class Alloc >
+        struct stream_char_common< std::basic_string< Char, Traits, Alloc > >
         {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<const CharT*>::type type;
+            typedef Char type;
         };
 
-        template <class CharT, class Traits, class Alloc>
-        struct stream_char< std::basic_string<CharT, Traits, Alloc> >
+        template < class Char, class Traits, class Alloc >
+        struct stream_char_common< boost::container::basic_string< Char, Traits, Alloc > >
         {
-            typedef CharT type;
+            typedef Char type;
         };
 
-        template <class CharT, class Traits, class Alloc>
-        struct stream_char< ::boost::container::basic_string<CharT, Traits, Alloc> >
-        {
-            typedef CharT type;
-        };
+        template < typename Char, std::size_t N >
+        struct stream_char_common< boost::array< Char, N > >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::array< Char, N > >
+        > {};
 
-        template<typename CharT, std::size_t N>
-        struct stream_char<boost::array<CharT, N> >
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT>::type type;
-        };
-
-        template<typename CharT, std::size_t N>
-        struct stream_char<boost::array<const CharT, N> >
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT>::type type;
-        };
+        template < typename Char, std::size_t N >
+        struct stream_char_common< boost::array< const Char, N > >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::array< const Char, N > >
+        > {};
 
 #if !defined(BOOST_NO_CXX11_HDR_ARRAY) && defined(BOOST_HAS_TR1_ARRAY)
-        template <typename CharT, std::size_t N>
-        struct stream_char<std::array<CharT, N> >
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT>::type type;
-        };
+        template < typename Char, std::size_t N >
+        struct stream_char_common< std::array<Char, N > >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< std::array< Char, N > >
+        > {};
 
-        template <typename CharT, std::size_t N>
-        struct stream_char<std::array<const CharT, N> >
-        {
-            typedef BOOST_DEDUCED_TYPENAME stream_char<CharT>::type type;
-        };
+        template < typename Char, std::size_t N >
+        struct stream_char_common< std::array< const Char, N > >: public boost::mpl::if_c<
+            boost::detail::is_char_or_wchar< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< std::array< const Char, N > >
+        > {};
 #endif // !defined(BOOST_NO_CXX11_HDR_ARRAY) && defined(BOOST_HAS_TR1_ARRAY)
 
 #if !defined(BOOST_LCAST_NO_WCHAR_T) && defined(BOOST_NO_INTRINSIC_WCHAR_T)
-        template<>
-        struct stream_char<wchar_t>
+        template <>
+        struct stream_char_common< wchar_t >
         {
-            typedef boost::detail::not_a_character_type type;
-        };
-
-        template<>
-        struct stream_char<wchar_t*>
-        {
-            typedef wchar_t type;
-        };
-
-        template<>
-        struct stream_char<const wchar_t*>
-        {
-            typedef wchar_t type;
+            typedef char type;
         };
 #endif
     }
 
+    namespace detail // deduce_source_char_impl<T>
+    {
+        // If type T is `deduce_character_type_later` type, then tries to deduce
+        // character type using boost::has_left_shift<T> metafunction.
+        // Otherwise supplied type T is a character type, that must be normalized
+        // using normalize_single_byte_char<Char>.
+        // Executed at Stage 2  (See deduce_source_char<T> and deduce_target_char<T>)
+        template < class Char > 
+        struct deduce_source_char_impl
+        { 
+            typedef BOOST_DEDUCED_TYPENAME boost::detail::normalize_single_byte_char< Char >::type type; 
+        };
+        
+        template < class T > 
+        struct deduce_source_char_impl< deduce_character_type_later< T > > 
+        {
+            typedef boost::has_left_shift< std::basic_ostream< char >, T > result_t;
+
+#if defined(BOOST_LCAST_NO_WCHAR_T)
+            BOOST_STATIC_ASSERT_MSG((result_t::value), 
+                "Source type is not std::ostream`able and std::wostream`s are not supported by your STL implementation");
+            typedef char type;
+#else
+            typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
+                result_t::value, char, wchar_t
+            >::type type;
+
+            BOOST_STATIC_ASSERT_MSG((result_t::value || boost::has_left_shift< std::basic_ostream< type >, T >::value), 
+                "Source type is neither std::ostream`able nor std::wostream`able");
+#endif
+        };
+    }
+
+    namespace detail  // deduce_target_char_impl<T>
+    {
+        // If type T is `deduce_character_type_later` type, then tries to deduce
+        // character type using boost::has_right_shift<T> metafunction.
+        // Otherwise supplied type T is a character type, that must be normalized
+        // using normalize_single_byte_char<Char>.
+        // Executed at Stage 2  (See deduce_source_char<T> and deduce_target_char<T>)
+        template < class Char > 
+        struct deduce_target_char_impl 
+        { 
+            typedef BOOST_DEDUCED_TYPENAME normalize_single_byte_char< Char >::type type; 
+        };
+        
+        template < class T > 
+        struct deduce_target_char_impl< deduce_character_type_later<T> > 
+        { 
+            typedef boost::has_right_shift<std::basic_istream<char>, T > result_t;
+
+#if defined(BOOST_LCAST_NO_WCHAR_T)
+            BOOST_STATIC_ASSERT_MSG((result_t::value), 
+                "Target type is not std::istream`able and std::wistream`s are not supported by your STL implementation");
+            typedef char type;
+#else
+            typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
+                result_t::value, char, wchar_t
+            >::type type;
+            
+            BOOST_STATIC_ASSERT_MSG((result_t::value || boost::has_right_shift<std::basic_istream<wchar_t>, T >::value), 
+                "Target type is neither std::istream`able nor std::wistream`able");
+#endif
+        };
+    } 
+
+    namespace detail  // deduce_target_char<T> and deduce_source_char<T>
+    {
+        // We deduce stream character types in two stages.
+        //
+        // Stage 1 is common for Target and Source. At Stage 1 we get 
+        // non normalized character type (may contain unsigned/signed char)
+        // or deduce_character_type_later<T> where T is the original type.
+        // Stage 1 is executed by stream_char_common<T>
+        //
+        // At Stage 2 we normalize character types or try to deduce character 
+        // type using metafunctions. 
+        // Stage 2 is executed by deduce_target_char_impl<T> and 
+        // deduce_source_char_impl<T>
+        //
+        // deduce_target_char<T> and deduce_source_char<T> functions combine 
+        // both stages
+
+        template < class T >
+        struct deduce_target_char
+        {
+            typedef BOOST_DEDUCED_TYPENAME stream_char_common< T >::type stage1_type;
+            typedef BOOST_DEDUCED_TYPENAME deduce_target_char_impl< stage1_type >::type stage2_type;
+
+            typedef stage2_type type;
+        };
+
+        template < class T >
+        struct deduce_source_char
+        {
+            typedef BOOST_DEDUCED_TYPENAME stream_char_common< T >::type stage1_type;
+            typedef BOOST_DEDUCED_TYPENAME deduce_source_char_impl< stage1_type >::type stage2_type;
+
+            typedef stage2_type type;
+        };
+    }
+
     namespace detail // deduce_char_traits template
     {
-
-        template<class CharT, class Target, class Source>
+        // We are attempting to get char_traits<> from Source or Tagret
+        // template parameter. Otherwise we'll be using std::char_traits<Char>
+        template < class Char, class Target, class Source >
         struct deduce_char_traits
         {
-            typedef std::char_traits<CharT> type;
+            typedef std::char_traits< Char > type;
         };
 
-        template<class CharT, class Traits, class Alloc, class Source>
-        struct deduce_char_traits< CharT
-                                 , std::basic_string<CharT,Traits,Alloc>
+        template < class Char, class Traits, class Alloc, class Source >
+        struct deduce_char_traits< Char
+                                 , std::basic_string< Char, Traits, Alloc >
                                  , Source
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Target, class Traits, class Alloc>
-        struct deduce_char_traits< CharT
+        template < class Char, class Target, class Traits, class Alloc >
+        struct deduce_char_traits< Char
                                  , Target
-                                 , std::basic_string<CharT,Traits,Alloc>
+                                 , std::basic_string< Char, Traits, Alloc >
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Traits, class Alloc, class Source>
-        struct deduce_char_traits< CharT
-                                 , ::boost::container::basic_string<CharT,Traits,Alloc>
+        template < class Char, class Traits, class Alloc, class Source >
+        struct deduce_char_traits< Char
+                                 , boost::container::basic_string< Char, Traits, Alloc >
                                  , Source
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Target, class Traits, class Alloc>
-        struct deduce_char_traits< CharT
+        template < class Char, class Target, class Traits, class Alloc >
+        struct deduce_char_traits< Char
                                  , Target
-                                 , ::boost::container::basic_string<CharT,Traits,Alloc>
+                                 , boost::container::basic_string< Char, Traits, Alloc >
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Traits, class Alloc1, class Alloc2>
-        struct deduce_char_traits< CharT
-                                 , std::basic_string<CharT,Traits,Alloc1>
-                                 , std::basic_string<CharT,Traits,Alloc2>
+        template < class Char, class Traits, class Alloc1, class Alloc2 >
+        struct deduce_char_traits< Char
+                                 , std::basic_string< Char, Traits, Alloc1 >
+                                 , std::basic_string< Char, Traits, Alloc2 >
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Traits, class Alloc1, class Alloc2>
-        struct deduce_char_traits< CharT
-                                 , ::boost::container::basic_string<CharT,Traits,Alloc1>
-                                 , ::boost::container::basic_string<CharT,Traits,Alloc2>
+        template<class Char, class Traits, class Alloc1, class Alloc2>
+        struct deduce_char_traits< Char
+                                 , boost::container::basic_string< Char, Traits, Alloc1 >
+                                 , boost::container::basic_string< Char, Traits, Alloc2 >
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Traits, class Alloc1, class Alloc2>
-        struct deduce_char_traits< CharT
-                                 , ::boost::container::basic_string<CharT,Traits,Alloc1>
-                                 , ::std::basic_string<CharT,Traits,Alloc2>
+        template < class Char, class Traits, class Alloc1, class Alloc2 >
+        struct deduce_char_traits< Char
+                                 , boost::container::basic_string< Char, Traits, Alloc1 >
+                                 , std::basic_string< Char, Traits, Alloc2 >
                                  >
         {
             typedef Traits type;
         };
 
-        template<class CharT, class Traits, class Alloc1, class Alloc2>
-        struct deduce_char_traits< CharT
-                                 , ::std::basic_string<CharT,Traits,Alloc1>
-                                 , ::boost::container::basic_string<CharT,Traits,Alloc2>
+        template < class Char, class Traits, class Alloc1, class Alloc2 >
+        struct deduce_char_traits< Char
+                                 , std::basic_string< Char, Traits, Alloc1 >
+                                 , boost::container::basic_string< Char, Traits, Alloc2 >
                                  >
         {
             typedef Traits type;
@@ -518,7 +615,7 @@ namespace boost {
 
     namespace detail // '0', '+' and '-' constants
     {
-        template<typename CharT> struct lcast_char_constants;
+        template < typename Char > struct lcast_char_constants;
 
         template<>
         struct lcast_char_constants<char>
@@ -1247,7 +1344,7 @@ namespace boost {
             typedef std::basic_ostringstream<CharT, Traits>       out_stream_t;
             typedef stl_buf_unlocker<std::basic_stringbuf<CharT, Traits>, CharT> unlocked_but_t;
 #endif
-            typedef BOOST_DEDUCED_TYPENAME ::boost::mpl::if_c<
+            typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
                 RequiresStringbuffer,
                 out_stream_t,
                 do_not_construct_out_stream_t
@@ -1288,7 +1385,7 @@ namespace boost {
                 std::locale loc;
                 CharT const w = BOOST_USE_FACET(std::ctype<CharT>, loc).widen(ch);
 #else
-                CharT const w = ch;
+                CharT const w = static_cast<CharT>(ch);
 #endif
                 Traits::assign(*start, w);
                 finish = start + 1;
@@ -1439,7 +1536,7 @@ namespace boost {
             }
 
             template<class Alloc>
-            bool operator<<(::boost::container::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT
+            bool operator<<(boost::container::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT
             {
                 start = const_cast<CharT*>(str.data());
                 finish = start + str.length();
@@ -1777,7 +1874,7 @@ namespace boost {
             bool operator>>(std::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; }
 
             template<class Alloc>
-            bool operator>>(::boost::container::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; }
+            bool operator>>(boost::container::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; }
 
             
     private:
@@ -1917,7 +2014,7 @@ namespace boost {
                  * */
                 boost::mpl::if_c<
 #if defined(BOOST_HAS_LONG_LONG) || defined(BOOST_HAS_MS_INT64)
-                    ::boost::type_traits::ice_eq< sizeof(double), sizeof(long double) >::value,
+                    boost::type_traits::ice_eq< sizeof(double), sizeof(long double) >::value,
 #else
                      0
 #endif
@@ -1968,7 +2065,7 @@ namespace boost {
         };
 
         template<typename CharT, typename Traits, typename Alloc>
-        struct is_stdstring< ::boost::container::basic_string<CharT, Traits, Alloc> >
+        struct is_stdstring< boost::container::basic_string<CharT, Traits, Alloc> >
         {
             BOOST_STATIC_CONSTANT(bool, value = true );
         };
@@ -1978,13 +2075,13 @@ namespace boost {
         {
             BOOST_STATIC_CONSTANT(bool, value =
                (
-                   ::boost::type_traits::ice_and<
-                           ::boost::is_arithmetic<Source>::value,
-                           ::boost::is_arithmetic<Target>::value,
-                           ::boost::type_traits::ice_not<
+                   boost::type_traits::ice_and<
+                           boost::is_arithmetic<Source>::value,
+                           boost::is_arithmetic<Target>::value,
+                           boost::type_traits::ice_not<
                                 detail::is_char_or_wchar<Target>::value
                            >::value,
-                           ::boost::type_traits::ice_not<
+                           boost::type_traits::ice_not<
                                 detail::is_char_or_wchar<Source>::value
                            >::value
                    >::value
@@ -2002,14 +2099,14 @@ namespace boost {
         {
             BOOST_STATIC_CONSTANT(bool, value =
                 (
-                    ::boost::type_traits::ice_or<
-                        ::boost::type_traits::ice_and<
+                    boost::type_traits::ice_or<
+                        boost::type_traits::ice_and<
                              is_same<Source,Target>::value,
                              is_char_or_wchar<Target>::value
                         >::value,
-                        ::boost::type_traits::ice_and<
-                             ::boost::type_traits::ice_eq< sizeof(char),sizeof(Target)>::value,
-                             ::boost::type_traits::ice_eq< sizeof(char),sizeof(Source)>::value,
+                        boost::type_traits::ice_and<
+                             boost::type_traits::ice_eq< sizeof(char),sizeof(Target)>::value,
+                             boost::type_traits::ice_eq< sizeof(char),sizeof(Source)>::value,
                              is_char_or_wchar<Target>::value,
                              is_char_or_wchar<Source>::value
                         >::value
@@ -2025,15 +2122,15 @@ namespace boost {
         template <typename Float, typename Char>
         struct is_this_float_conversion_optimized 
         {
-            typedef ::boost::type_traits::ice_and<
-                ::boost::is_float<Float>::value,
+            typedef boost::type_traits::ice_and<
+                boost::is_float<Float>::value,
 #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_SWPRINTF) && !defined(__MINGW32__)
-                ::boost::type_traits::ice_or<
-                    ::boost::type_traits::ice_eq<sizeof(Char), sizeof(char) >::value,
-                    ::boost::is_same<Char, wchar_t>::value
+                boost::type_traits::ice_or<
+                    boost::type_traits::ice_eq<sizeof(Char), sizeof(char) >::value,
+                    boost::is_same<Char, wchar_t>::value
                 >::value
 #else
-                ::boost::type_traits::ice_eq<sizeof(Char), sizeof(char) >::value
+                boost::type_traits::ice_eq<sizeof(Char), sizeof(char) >::value
 #endif
             > result_type;
 
@@ -2059,13 +2156,13 @@ namespace boost {
         };
 
         template<typename CharT, typename Traits, typename Alloc>
-        struct is_char_array_to_stdstring< ::boost::container::basic_string<CharT, Traits, Alloc>, CharT* >
+        struct is_char_array_to_stdstring< boost::container::basic_string<CharT, Traits, Alloc>, CharT* >
         {
             BOOST_STATIC_CONSTANT(bool, value = true );
         };
 
         template<typename CharT, typename Traits, typename Alloc>
-        struct is_char_array_to_stdstring< ::boost::container::basic_string<CharT, Traits, Alloc>, const CharT* >
+        struct is_char_array_to_stdstring< boost::container::basic_string<CharT, Traits, Alloc>, const CharT* >
         {
             BOOST_STATIC_CONSTANT(bool, value = true );
         };
@@ -2081,51 +2178,58 @@ namespace boost {
         {
             static inline Target lexical_cast_impl(const Source& arg)
             {
-                typedef BOOST_DEDUCED_TYPENAME detail::array_to_pointer_decay<Source>::type src;
-                typedef BOOST_DEDUCED_TYPENAME ::boost::remove_cv<src>::type no_cv_src;
-                typedef BOOST_DEDUCED_TYPENAME detail::stream_char<Target>::type target_char_t;
-                typedef BOOST_DEDUCED_TYPENAME detail::stream_char<no_cv_src>::type src_char_type;
-                typedef BOOST_DEDUCED_TYPENAME detail::widest_char<
-                    target_char_t, src_char_type
+                typedef BOOST_DEDUCED_TYPENAME boost::detail::array_to_pointer_decay<Source>::type src;
+                typedef BOOST_DEDUCED_TYPENAME boost::remove_cv<src>::type            no_cv_src;
+                
+                typedef boost::detail::deduce_source_char<no_cv_src>                           deduce_src_char_metafunc;
+                typedef BOOST_DEDUCED_TYPENAME deduce_src_char_metafunc::type           src_char_t;
+                typedef BOOST_DEDUCED_TYPENAME boost::detail::deduce_target_char<Target>::type target_char_t;
+                
+                typedef BOOST_DEDUCED_TYPENAME boost::detail::widest_char<
+                    target_char_t, src_char_t
                 >::type char_type;
 
 #if !defined(BOOST_NO_CHAR16_T) && defined(BOOST_NO_UNICODE_LITERALS)
-                BOOST_STATIC_ASSERT_MSG(( !::boost::is_same<char16_t, src_char_type>::value
-                                          && !::boost::is_same<char16_t, target_char_t>::value),
+                BOOST_STATIC_ASSERT_MSG(( !boost::is_same<char16_t, src_char_t>::value
+                                          && !boost::is_same<char16_t, target_char_t>::value),
                     "Your compiler does not have full support for char16_t" );
 #endif
 #if !defined(BOOST_NO_CHAR32_T) && defined(BOOST_NO_UNICODE_LITERALS)
-                BOOST_STATIC_ASSERT_MSG(( !::boost::is_same<char32_t, src_char_type>::value
-                                          && !::boost::is_same<char32_t, target_char_t>::value),
+                BOOST_STATIC_ASSERT_MSG(( !boost::is_same<char32_t, src_char_t>::value
+                                          && !boost::is_same<char32_t, target_char_t>::value),
                     "Your compiler does not have full support for char32_t" );
 #endif
 
-                typedef BOOST_DEDUCED_TYPENAME ::boost::detail::deduce_char_traits<
+                typedef BOOST_DEDUCED_TYPENAME boost::detail::deduce_char_traits<
                     char_type, Target, no_cv_src
                 >::type traits;
 
-                typedef ::boost::type_traits::ice_and<
-                    ::boost::detail::is_char_or_wchar<src_char_type>::value,                    // source is lexical type
-                    ::boost::detail::is_char_or_wchar<target_char_t>::value,                    // target is a lexical type
-                    ::boost::is_same<char, src_char_type>::value,                               // source is not a wide character based type
-                    ::boost::type_traits::ice_ne<sizeof(char), sizeof(target_char_t) >::value   // target type is based on wide character
+                typedef boost::type_traits::ice_and<
+                    boost::is_same<char, src_char_t>::value,                                  // source is not a wide character based type
+                    boost::type_traits::ice_ne<sizeof(char), sizeof(target_char_t) >::value,  // target type is based on wide character
+                    boost::type_traits::ice_not<
+                        boost::detail::is_char_or_wchar<no_cv_src>::value                     // single character widening is optimized
+                    >::value                                                                  // and does not requires stringbuffer
                 >   is_string_widening_required_t;
 
-                typedef ::boost::type_traits::ice_or<
-                    ::boost::is_integral<no_cv_src>::value,
-                    ::boost::detail::is_this_float_conversion_optimized<no_cv_src, char_type >::value,
-                    ::boost::detail::is_char_or_wchar<src_char_type >::value
-                >   is_source_input_optimized_t;
+                typedef boost::type_traits::ice_not< boost::type_traits::ice_or<
+                    boost::is_integral<no_cv_src>::value,
+                    boost::detail::is_this_float_conversion_optimized<no_cv_src, char_type >::value,
+                    boost::detail::is_char_or_wchar<
+                        BOOST_DEDUCED_TYPENAME deduce_src_char_metafunc::stage1_type          // if we did not get character type at stage1
+                    >::value                                                                  // then we have no optimization for that type
+                >::value >   is_source_input_not_optimized_t;
 
                 // Target type must be default constructible
                 Target result;
 
                 // If we have an optimized conversion for
                 // Source, we do not need to construct stringbuf.
-                const bool requires_stringbuf = ::boost::type_traits::ice_or<
-                        is_string_widening_required_t::value,
-                        ::boost::type_traits::ice_not< is_source_input_optimized_t::value >::value
-                >::value;
+                BOOST_STATIC_CONSTANT(bool, requires_stringbuf = 
+                    (boost::type_traits::ice_or<
+                        is_string_widening_required_t::value, is_source_input_not_optimized_t::value
+                    >::value)
+                );
                
                 typedef detail::lexical_stream_limited_src<char_type, traits, requires_stringbuf > interpreter_type;
 
@@ -2163,7 +2267,7 @@ namespace boost {
          typedef Source source_type ;
 
          typedef BOOST_DEDUCED_TYPENAME mpl::if_<
-            ::boost::is_arithmetic<Source>, Source, Source const&
+            boost::is_arithmetic<Source>, Source, Source const&
           >::type argument_type ;
 
          static source_type nearbyint ( argument_type s )
@@ -2247,19 +2351,19 @@ namespace boost {
         {
             static inline Target lexical_cast_impl(const Source &arg)
             {
-                typedef BOOST_DEDUCED_TYPENAME ::boost::mpl::if_c<
-                    ::boost::type_traits::ice_and<
-                        ::boost::type_traits::ice_or<
-                            ::boost::is_signed<Source>::value,
-                            ::boost::is_float<Source>::value
+                typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
+                    boost::type_traits::ice_and<
+                        boost::type_traits::ice_or<
+                            boost::is_signed<Source>::value,
+                            boost::is_float<Source>::value
                         >::value,
-                        ::boost::type_traits::ice_not<
-                            ::boost::is_same<Source, bool>::value
+                        boost::type_traits::ice_not<
+                            boost::is_same<Source, bool>::value
                         >::value,
-                        ::boost::type_traits::ice_not<
-                            ::boost::is_same<Target, bool>::value
+                        boost::type_traits::ice_not<
+                            boost::is_same<Target, bool>::value
                         >::value,
-                        ::boost::is_unsigned<Target>::value
+                        boost::is_unsigned<Target>::value
                     >::value,
                     lexical_cast_dynamic_num_ignoring_minus<Target, Source>,
                     lexical_cast_dynamic_num_not_ignoring_minus<Target, Source>
@@ -2273,86 +2377,44 @@ namespace boost {
     template <typename Target, typename Source>
     inline Target lexical_cast(const Source &arg)
     {
-        typedef BOOST_DEDUCED_TYPENAME ::boost::detail::array_to_pointer_decay<Source>::type src;
+        typedef BOOST_DEDUCED_TYPENAME boost::detail::array_to_pointer_decay<Source>::type src;
 
-        typedef BOOST_DEDUCED_TYPENAME ::boost::type_traits::ice_or<
-                ::boost::detail::is_xchar_to_xchar<Target, src >::value,
-                ::boost::detail::is_char_array_to_stdstring<Target, src >::value,
-                ::boost::type_traits::ice_and<
-                     ::boost::is_same<Target, src >::value,
-                     ::boost::detail::is_stdstring<Target >::value
+        typedef BOOST_DEDUCED_TYPENAME boost::type_traits::ice_or<
+                boost::detail::is_xchar_to_xchar<Target, src >::value,
+                boost::detail::is_char_array_to_stdstring<Target, src >::value,
+                boost::type_traits::ice_and<
+                     boost::is_same<Target, src >::value,
+                     boost::detail::is_stdstring<Target >::value
                 >::value
         > shall_we_copy_t;
 
         typedef BOOST_DEDUCED_TYPENAME
-                ::boost::detail::is_arithmetic_and_not_xchars<Target, src > shall_we_copy_with_dynamic_check_t;
+                boost::detail::is_arithmetic_and_not_xchars<Target, src > shall_we_copy_with_dynamic_check_t;
 
-        typedef BOOST_DEDUCED_TYPENAME ::boost::mpl::if_c<
+        typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
             shall_we_copy_t::value,
-            ::boost::detail::lexical_cast_copy<src >,
-            BOOST_DEDUCED_TYPENAME ::boost::mpl::if_c<
+            boost::detail::lexical_cast_copy<src >,
+            BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
                  shall_we_copy_with_dynamic_check_t::value,
-                 ::boost::detail::lexical_cast_dynamic_num<Target, src >,
-                 ::boost::detail::lexical_cast_do_cast<Target, src >
+                 boost::detail::lexical_cast_dynamic_num<Target, src >,
+                 boost::detail::lexical_cast_do_cast<Target, src >
             >::type
         >::type caster_type;
 
         return caster_type::lexical_cast_impl(arg);
     }
 
-    template <typename Target>
-    inline Target lexical_cast(const char* chars, std::size_t count)
+    template <typename Target, typename CharType>
+    inline Target lexical_cast(const CharType* chars, std::size_t count)
     {
-        return ::boost::lexical_cast<Target>(
-            ::boost::iterator_range<const char*>(chars, chars + count)
-        );
-    }
+        BOOST_STATIC_ASSERT_MSG(boost::detail::is_char_or_wchar<CharType>::value, 
+            "CharType must be a character or wide character type");
 
-
-    template <typename Target>
-    inline Target lexical_cast(const unsigned char* chars, std::size_t count)
-    {
-        return ::boost::lexical_cast<Target>(
-            ::boost::iterator_range<const unsigned char*>(chars, chars + count)
+        return boost::lexical_cast<Target>(
+            boost::iterator_range<const CharType*>(chars, chars + count)
         );
     }
 
-    template <typename Target>
-    inline Target lexical_cast(const signed char* chars, std::size_t count)
-    {
-        return ::boost::lexical_cast<Target>(
-            ::boost::iterator_range<const signed char*>(chars, chars + count)
-        );
-    }
-
-#ifndef BOOST_LCAST_NO_WCHAR_T
-    template <typename Target>
-    inline Target lexical_cast(const wchar_t* chars, std::size_t count)
-    {
-        return ::boost::lexical_cast<Target>(
-            ::boost::iterator_range<const wchar_t*>(chars, chars + count)
-        );
-    }
-#endif
-#ifndef BOOST_NO_CHAR16_T
-    template <typename Target>
-    inline Target lexical_cast(const char16_t* chars, std::size_t count)
-    {
-        return ::boost::lexical_cast<Target>(
-            ::boost::iterator_range<const char16_t*>(chars, chars + count)
-        );
-    }
-#endif
-#ifndef BOOST_NO_CHAR32_T
-    template <typename Target>
-    inline Target lexical_cast(const char32_t* chars, std::size_t count)
-    {
-        return ::boost::lexical_cast<Target>(
-            ::boost::iterator_range<const char32_t*>(chars, chars + count)
-        );
-    }
-#endif
-
 } // namespace boost
 
 #else // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index f77a845..633368f 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -49,5 +49,6 @@ test-suite conversion
     [ run lexical_cast_iterator_range_test.cpp ]
     [ run lexical_cast_arrays_test.cpp ]
     [ run lexical_cast_integral_types_test.cpp ]
+    [ run lexical_cast_stream_detection_test.cpp ]
   ;
 
diff --git a/test/lexical_cast_stream_detection_test.cpp b/test/lexical_cast_stream_detection_test.cpp
new file mode 100644
index 0000000..82bc562
--- /dev/null
+++ b/test/lexical_cast_stream_detection_test.cpp
@@ -0,0 +1,307 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2012.
+//
+//  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).
+
+
+#include <boost/config.hpp>
+#include <boost/test/unit_test.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+#include <iostream>
+
+
+///////////////////////// char streamable classes ///////////////////////////////////////////
+
+struct streamable_easy { enum ENU {value = 0}; };
+std::ostream& operator << (std::ostream& ostr, const streamable_easy&) {
+    return ostr << streamable_easy::value;
+}
+std::istream& operator >> (std::istream& istr, const streamable_easy&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, streamable_easy::value);
+    return istr;
+}
+
+struct streamable_medium { enum ENU {value = 1}; };
+template <class CharT>
+typename boost::enable_if<boost::is_same<CharT, char>, std::basic_ostream<CharT>&>::type 
+operator << (std::basic_ostream<CharT>& ostr, const streamable_medium&) {
+    return ostr << streamable_medium::value;
+}
+template <class CharT>
+typename boost::enable_if<boost::is_same<CharT, char>, std::basic_istream<CharT>&>::type 
+operator >> (std::basic_istream<CharT>& istr, const streamable_medium&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, streamable_medium::value);
+    return istr;
+}
+
+struct streamable_hard { enum ENU {value = 2}; };
+template <class CharT, class TraitsT>
+typename boost::enable_if<boost::is_same<CharT, char>, std::basic_ostream<CharT, TraitsT>&>::type 
+operator << (std::basic_ostream<CharT, TraitsT>& ostr, const streamable_hard&) {
+    return ostr << streamable_hard::value;
+}
+template <class CharT, class TraitsT>
+typename boost::enable_if<boost::is_same<CharT, char>, std::basic_istream<CharT, TraitsT>&>::type 
+operator >> (std::basic_istream<CharT, TraitsT>& istr, const streamable_hard&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, streamable_hard::value);
+    return istr;
+}
+
+struct streamable_hard2 { enum ENU {value = 3}; };
+template <class TraitsT>
+std::basic_ostream<char, TraitsT>& operator << (std::basic_ostream<char, TraitsT>& ostr, const streamable_hard2&) {
+    return ostr << streamable_hard2::value;
+}
+template <class TraitsT>
+std::basic_istream<char, TraitsT>& operator >> (std::basic_istream<char, TraitsT>& istr, const streamable_hard2&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, streamable_hard2::value);
+    return istr;
+}
+
+
+///////////////////////// wchar_t streamable classes ///////////////////////////////////////////
+
+struct wstreamable_easy { enum ENU {value = 4}; };
+std::wostream& operator << (std::wostream& ostr, const wstreamable_easy&) {
+    return ostr << wstreamable_easy::value;
+}
+std::wistream& operator >> (std::wistream& istr, const wstreamable_easy&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, wstreamable_easy::value);
+    return istr;
+}
+
+struct wstreamable_medium { enum ENU {value = 5}; };
+template <class CharT>
+typename boost::enable_if<boost::is_same<CharT, wchar_t>, std::basic_ostream<CharT>& >::type 
+operator << (std::basic_ostream<CharT>& ostr, const wstreamable_medium&) {
+    return ostr << wstreamable_medium::value;
+}
+template <class CharT>
+typename boost::enable_if<boost::is_same<CharT, wchar_t>, std::basic_istream<CharT>& >::type 
+operator >> (std::basic_istream<CharT>& istr, const wstreamable_medium&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, wstreamable_medium::value);
+    return istr;
+}
+
+struct wstreamable_hard { enum ENU {value = 6}; };
+template <class CharT, class TraitsT>
+typename boost::enable_if<boost::is_same<CharT, wchar_t>, std::basic_ostream<CharT, TraitsT>&>::type 
+operator << (std::basic_ostream<CharT, TraitsT>& ostr, const wstreamable_hard&) {
+    return ostr << wstreamable_hard::value;
+}
+template <class CharT, class TraitsT>
+typename boost::enable_if<boost::is_same<CharT, wchar_t>, std::basic_istream<CharT, TraitsT>&>::type 
+operator >> (std::basic_istream<CharT, TraitsT>& istr, const wstreamable_hard&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, wstreamable_hard::value);
+    return istr;
+}
+
+struct wstreamable_hard2 { enum ENU {value = 7}; };
+template <class TraitsT>
+std::basic_ostream<wchar_t, TraitsT>& operator << (std::basic_ostream<wchar_t, TraitsT>& ostr, const wstreamable_hard2&) {
+    return ostr << wstreamable_hard2::value;
+}
+template <class TraitsT>
+std::basic_istream<wchar_t, TraitsT>& operator >> (std::basic_istream<wchar_t, TraitsT>& istr, const wstreamable_hard2&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, wstreamable_hard2::value);
+    return istr;
+}
+
+///////////////////////// char and wchar_t streamable classes ///////////////////////////////////////////
+
+
+struct bistreamable_easy { enum ENU {value = 8}; };
+std::ostream& operator << (std::ostream& ostr, const bistreamable_easy&) {
+    return ostr << bistreamable_easy::value;
+}
+std::istream& operator >> (std::istream& istr, const bistreamable_easy&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, bistreamable_easy::value);
+    return istr;
+}
+
+std::wostream& operator << (std::wostream& ostr, const bistreamable_easy&) {
+    return ostr << bistreamable_easy::value + 100;
+}
+std::wistream& operator >> (std::wistream& istr, const bistreamable_easy&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, bistreamable_easy::value + 100);
+    return istr;
+}
+
+struct bistreamable_medium { enum ENU {value = 9}; };
+template <class CharT>
+std::basic_ostream<CharT>& operator << (std::basic_ostream<CharT>& ostr, const bistreamable_medium&) {
+    return ostr << bistreamable_medium::value + (sizeof(CharT) == 1 ? 0 : 100);
+}
+template <class CharT>
+std::basic_istream<CharT>& operator >> (std::basic_istream<CharT>& istr, const bistreamable_medium&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, bistreamable_medium::value + (sizeof(CharT) == 1 ? 0 : 100));
+    return istr;
+}
+
+struct bistreamable_hard { enum ENU {value = 10}; };
+template <class CharT, class TraitsT>
+std::basic_ostream<CharT, TraitsT>& operator << (std::basic_ostream<CharT, TraitsT>& ostr, const bistreamable_hard&) {
+    return ostr << bistreamable_hard::value + (sizeof(CharT) == 1 ? 0 : 100);
+}
+template <class CharT, class TraitsT>
+std::basic_istream<CharT, TraitsT>& operator >> (std::basic_istream<CharT, TraitsT>& istr, const bistreamable_hard&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, bistreamable_hard::value + (sizeof(CharT) == 1 ? 0 : 100));
+    return istr;
+}
+
+struct bistreamable_hard2 { enum ENU {value = 11}; };
+template <class TraitsT>
+std::basic_ostream<char, TraitsT>& operator << (std::basic_ostream<char, TraitsT>& ostr, const bistreamable_hard2&) {
+    return ostr << bistreamable_hard2::value;
+}
+template <class TraitsT>
+std::basic_istream<char, TraitsT>& operator >> (std::basic_istream<char, TraitsT>& istr, const bistreamable_hard2&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, bistreamable_hard2::value);
+    return istr;
+}
+
+template <class TraitsT>
+std::basic_ostream<wchar_t, TraitsT>& operator << (std::basic_ostream<wchar_t, TraitsT>& ostr, const bistreamable_hard2&) {
+    return ostr << bistreamable_hard2::value + 100;
+}
+template <class TraitsT>
+std::basic_istream<wchar_t, TraitsT>& operator >> (std::basic_istream<wchar_t, TraitsT>& istr, const bistreamable_hard2&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, bistreamable_hard2::value + 100);
+    return istr;
+}
+
+
+void test_ostream_character_detection();
+void test_istream_character_detection();
+void test_mixed_stream_character_detection();
+
+boost::unit_test::test_suite *init_unit_test_suite(int, char *[])
+{
+    boost::unit_test::test_suite *suite = 
+        BOOST_TEST_SUITE("lexical_cast stream character detection");
+    suite->add(BOOST_TEST_CASE(&test_ostream_character_detection));
+    suite->add(BOOST_TEST_CASE(&test_istream_character_detection));
+    suite->add(BOOST_TEST_CASE(&test_mixed_stream_character_detection));
+    
+    return suite;
+}
+
+template <class T>
+static void test_ostr_impl() {
+    T streamable;
+    BOOST_CHECK_EQUAL(T::value,  boost::lexical_cast<int>(streamable));
+    BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(T::value),  boost::lexical_cast<std::string>(streamable));
+}
+
+template <class T>
+static void test_wostr_impl() {
+    T streamable;
+    BOOST_CHECK_EQUAL(T::value,  boost::lexical_cast<int>(streamable));
+    // BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(T::value), boost::lexical_cast<std::string>(streamable)); // Shall not compile???
+    BOOST_CHECK(boost::lexical_cast<std::wstring>(T::value) == boost::lexical_cast<std::wstring>(streamable));
+}
+
+template <class T>
+static void test_bistr_impl() {
+    T streamable;
+
+    BOOST_CHECK_EQUAL(T::value,  boost::lexical_cast<int>(streamable));
+    BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(T::value),  boost::lexical_cast<std::string>(streamable));
+
+    BOOST_CHECK(boost::lexical_cast<std::wstring>(T::value + 100) == boost::lexical_cast<std::wstring>(streamable));
+}
+
+void test_ostream_character_detection() {
+    test_ostr_impl<streamable_easy>();
+    test_ostr_impl<streamable_medium>();
+    test_ostr_impl<streamable_hard>();
+    test_ostr_impl<streamable_hard2>();
+    
+    test_wostr_impl<wstreamable_easy>();
+    test_wostr_impl<wstreamable_medium>();
+    test_wostr_impl<wstreamable_hard>();
+    test_wostr_impl<wstreamable_hard2>();
+    
+    test_bistr_impl<bistreamable_easy>();
+    test_bistr_impl<bistreamable_medium>();
+    test_bistr_impl<bistreamable_hard>();
+    test_bistr_impl<bistreamable_hard2>();
+}
+
+
+template <class T>
+static void test_istr_impl() {
+    boost::lexical_cast<T>(T::value);
+    boost::lexical_cast<T>(boost::lexical_cast<std::string>(T::value));
+}
+
+template <class T>
+static void test_wistr_impl() {
+    boost::lexical_cast<T>(T::value);
+    //boost::lexical_cast<T>(boost::lexical_cast<std::string>(T::value)); // Shall not compile???
+    boost::lexical_cast<T>(boost::lexical_cast<std::wstring>(T::value));
+}
+
+template <class T>
+static void test_bistr_instr_impl() {
+    boost::lexical_cast<T>(T::value);
+    boost::lexical_cast<T>(boost::lexical_cast<std::string>(T::value));
+    boost::lexical_cast<T>(boost::lexical_cast<std::wstring>(T::value + 100));
+}
+
+void test_istream_character_detection() {
+    test_istr_impl<streamable_easy>();
+    test_istr_impl<streamable_medium>();
+    test_istr_impl<streamable_hard>();
+    test_istr_impl<streamable_hard2>();
+    
+    test_wistr_impl<wstreamable_easy>();
+    test_wistr_impl<wstreamable_medium>();
+    test_wistr_impl<wstreamable_hard>();
+    test_wistr_impl<wstreamable_hard2>();
+    
+    test_bistr_instr_impl<bistreamable_easy>();
+    test_bistr_instr_impl<bistreamable_medium>();
+    test_bistr_instr_impl<bistreamable_hard>();
+    test_bistr_instr_impl<bistreamable_hard2>();
+}
+
+
+
+
+
+
+struct wistreamble_ostreamable { enum ENU {value = 200}; };
+std::ostream& operator << (std::ostream& ostr, const wistreamble_ostreamable&) {
+    return ostr << wistreamble_ostreamable::value;
+}
+std::wistream& operator >> (std::wistream& istr, const wistreamble_ostreamable&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, wistreamble_ostreamable::value);
+    return istr;
+}
+
+struct istreamble_wostreamable { enum ENU {value = 201}; };
+std::wostream& operator << (std::wostream& ostr, const istreamble_wostreamable&) {
+    return ostr << istreamble_wostreamable::value;
+}
+std::istream& operator >> (std::istream& istr, const istreamble_wostreamable&) {
+    int i; istr >> i; BOOST_CHECK_EQUAL(i, istreamble_wostreamable::value);
+    return istr;
+}
+
+void test_mixed_stream_character_detection() {
+    //boost::lexical_cast<std::wstring>(std::string("qwe")); // TODO: ALLOW IT AS EXTENSION!
+    
+    boost::lexical_cast<wistreamble_ostreamable>(wistreamble_ostreamable::value);
+    BOOST_CHECK_EQUAL(boost::lexical_cast<int>(wistreamble_ostreamable()), wistreamble_ostreamable::value);
+    
+    boost::lexical_cast<istreamble_wostreamable>(istreamble_wostreamable::value);
+    BOOST_CHECK_EQUAL(boost::lexical_cast<int>(istreamble_wostreamable()), istreamble_wostreamable::value);
+}