Chris@102: // Copyright Kevlin Henney, 2000-2005.
Chris@102: // Copyright Alexander Nasonov, 2006-2010.
Chris@102: // Copyright Antony Polukhin, 2011-2014.
Chris@102: //
Chris@102: // Distributed under the Boost Software License, Version 1.0. (See
Chris@102: // accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: //
Chris@102: // what:  lexical_cast custom keyword cast
Chris@102: // who:   contributed by Kevlin Henney,
Chris@102: //        enhanced with contributions from Terje Slettebo,
Chris@102: //        with additional fixes and suggestions from Gennaro Prota,
Chris@102: //        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
Chris@102: //        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
Chris@102: //        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
Chris@102: // when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
Chris@102: 
Chris@102: #ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
Chris@102: #define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
Chris@102: 
Chris@102: #include <boost/config.hpp>
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #   pragma once
Chris@102: #endif
Chris@102: 
Chris@102: #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
Chris@102: #define BOOST_LCAST_NO_WCHAR_T
Chris@102: #endif
Chris@102: 
Chris@102: #include <cstddef>
Chris@102: #include <string>
Chris@102: #include <boost/limits.hpp>
Chris@102: #include <boost/mpl/if.hpp>
Chris@102: #include <boost/type_traits/ice.hpp>
Chris@102: #include <boost/type_traits/is_integral.hpp>
Chris@102: #include <boost/type_traits/is_float.hpp>
Chris@102: #include <boost/type_traits/has_left_shift.hpp>
Chris@102: #include <boost/type_traits/has_right_shift.hpp>
Chris@102: #include <boost/static_assert.hpp>
Chris@102: #include <boost/detail/lcast_precision.hpp>
Chris@102: 
Chris@102: #include <boost/lexical_cast/detail/widest_char.hpp>
Chris@102: #include <boost/lexical_cast/detail/is_character.hpp>
Chris@102: 
Chris@102: #ifndef BOOST_NO_CXX11_HDR_ARRAY
Chris@102: #include <array>
Chris@102: #endif
Chris@102: 
Chris@102: #include <boost/array.hpp>
Chris@102: #include <boost/range/iterator_range_core.hpp>
Chris@102: #include <boost/container/container_fwd.hpp>
Chris@102: 
Chris@102: #include <boost/lexical_cast/detail/converter_lexical_streams.hpp>
Chris@102: 
Chris@102: namespace boost {
Chris@102: 
Chris@102:     namespace detail // normalize_single_byte_char<Char>
Chris@102:     {
Chris@102:         // Converts signed/unsigned char to char
Chris@102:         template < class Char >
Chris@102:         struct normalize_single_byte_char 
Chris@102:         {
Chris@102:             typedef Char type;
Chris@102:         };
Chris@102: 
Chris@102:         template <>
Chris@102:         struct normalize_single_byte_char< signed char >
Chris@102:         {
Chris@102:             typedef char type;
Chris@102:         };
Chris@102: 
Chris@102:         template <>
Chris@102:         struct normalize_single_byte_char< unsigned char >
Chris@102:         {
Chris@102:             typedef char type;
Chris@102:         };
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail // deduce_character_type_later<T>
Chris@102:     {
Chris@102:         // Helper type, meaning that stram character for T must be deduced 
Chris@102:         // at Stage 2 (See deduce_source_char<T> and deduce_target_char<T>)
Chris@102:         template < class T > struct deduce_character_type_later {};
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail // stream_char_common<T>
Chris@102:     {
Chris@102:         // Selectors to choose stream character type (common for Source and Target)
Chris@102:         // Returns one of char, wchar_t, char16_t, char32_t or deduce_character_type_later<T> types
Chris@102:         // Executed on Stage 1 (See deduce_source_char<T> and deduce_target_char<T>)
Chris@102:         template < typename Type >
Chris@102:         struct stream_char_common: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Type >::value,
Chris@102:             Type,
Chris@102:             boost::detail::deduce_character_type_later< Type >
Chris@102:         > {};
Chris@102: 
Chris@102:         template < typename Char >
Chris@102:         struct stream_char_common< Char* >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< Char* >
Chris@102:         > {};
Chris@102: 
Chris@102:         template < typename Char >
Chris@102:         struct stream_char_common< const Char* >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< const Char* >
Chris@102:         > {};
Chris@102: 
Chris@102:         template < typename Char >
Chris@102:         struct stream_char_common< boost::iterator_range< Char* > >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< boost::iterator_range< Char* > >
Chris@102:         > {};
Chris@102:     
Chris@102:         template < typename Char >
Chris@102:         struct stream_char_common< boost::iterator_range< const Char* > >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< boost::iterator_range< const Char* > >
Chris@102:         > {};
Chris@102: 
Chris@102:         template < class Char, class Traits, class Alloc >
Chris@102:         struct stream_char_common< std::basic_string< Char, Traits, Alloc > >
Chris@102:         {
Chris@102:             typedef Char type;
Chris@102:         };
Chris@102: 
Chris@102:         template < class Char, class Traits, class Alloc >
Chris@102:         struct stream_char_common< boost::container::basic_string< Char, Traits, Alloc > >
Chris@102:         {
Chris@102:             typedef Char type;
Chris@102:         };
Chris@102: 
Chris@102:         template < typename Char, std::size_t N >
Chris@102:         struct stream_char_common< boost::array< Char, N > >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< boost::array< Char, N > >
Chris@102:         > {};
Chris@102: 
Chris@102:         template < typename Char, std::size_t N >
Chris@102:         struct stream_char_common< boost::array< const Char, N > >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< boost::array< const Char, N > >
Chris@102:         > {};
Chris@102: 
Chris@102: #ifndef BOOST_NO_CXX11_HDR_ARRAY
Chris@102:         template < typename Char, std::size_t N >
Chris@102:         struct stream_char_common< std::array<Char, N > >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< std::array< Char, N > >
Chris@102:         > {};
Chris@102: 
Chris@102:         template < typename Char, std::size_t N >
Chris@102:         struct stream_char_common< std::array< const Char, N > >: public boost::mpl::if_c<
Chris@102:             boost::detail::is_character< Char >::value,
Chris@102:             Char,
Chris@102:             boost::detail::deduce_character_type_later< std::array< const Char, N > >
Chris@102:         > {};
Chris@102: #endif
Chris@102: 
Chris@102: #ifdef BOOST_HAS_INT128
Chris@102:         template <> struct stream_char_common< boost::int128_type >: public boost::mpl::identity< char > {};
Chris@102:         template <> struct stream_char_common< boost::uint128_type >: public boost::mpl::identity< char > {};
Chris@102: #endif
Chris@102: 
Chris@102: #if !defined(BOOST_LCAST_NO_WCHAR_T) && defined(BOOST_NO_INTRINSIC_WCHAR_T)
Chris@102:         template <>
Chris@102:         struct stream_char_common< wchar_t >
Chris@102:         {
Chris@102:             typedef char type;
Chris@102:         };
Chris@102: #endif
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail // deduce_source_char_impl<T>
Chris@102:     {
Chris@102:         // If type T is `deduce_character_type_later` type, then tries to deduce
Chris@102:         // character type using boost::has_left_shift<T> metafunction.
Chris@102:         // Otherwise supplied type T is a character type, that must be normalized
Chris@102:         // using normalize_single_byte_char<Char>.
Chris@102:         // Executed at Stage 2  (See deduce_source_char<T> and deduce_target_char<T>)
Chris@102:         template < class Char > 
Chris@102:         struct deduce_source_char_impl
Chris@102:         { 
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::detail::normalize_single_byte_char< Char >::type type; 
Chris@102:         };
Chris@102:         
Chris@102:         template < class T > 
Chris@102:         struct deduce_source_char_impl< deduce_character_type_later< T > > 
Chris@102:         {
Chris@102:             typedef boost::has_left_shift< std::basic_ostream< char >, T > result_t;
Chris@102: 
Chris@102: #if defined(BOOST_LCAST_NO_WCHAR_T)
Chris@102:             BOOST_STATIC_ASSERT_MSG((result_t::value), 
Chris@102:                 "Source type is not std::ostream`able and std::wostream`s are not supported by your STL implementation");
Chris@102:             typedef char type;
Chris@102: #else
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
Chris@102:                 result_t::value, char, wchar_t
Chris@102:             >::type type;
Chris@102: 
Chris@102:             BOOST_STATIC_ASSERT_MSG((result_t::value || boost::has_left_shift< std::basic_ostream< type >, T >::value), 
Chris@102:                 "Source type is neither std::ostream`able nor std::wostream`able");
Chris@102: #endif
Chris@102:         };
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail  // deduce_target_char_impl<T>
Chris@102:     {
Chris@102:         // If type T is `deduce_character_type_later` type, then tries to deduce
Chris@102:         // character type using boost::has_right_shift<T> metafunction.
Chris@102:         // Otherwise supplied type T is a character type, that must be normalized
Chris@102:         // using normalize_single_byte_char<Char>.
Chris@102:         // Executed at Stage 2  (See deduce_source_char<T> and deduce_target_char<T>)
Chris@102:         template < class Char > 
Chris@102:         struct deduce_target_char_impl 
Chris@102:         { 
Chris@102:             typedef BOOST_DEDUCED_TYPENAME normalize_single_byte_char< Char >::type type; 
Chris@102:         };
Chris@102:         
Chris@102:         template < class T > 
Chris@102:         struct deduce_target_char_impl< deduce_character_type_later<T> > 
Chris@102:         { 
Chris@102:             typedef boost::has_right_shift<std::basic_istream<char>, T > result_t;
Chris@102: 
Chris@102: #if defined(BOOST_LCAST_NO_WCHAR_T)
Chris@102:             BOOST_STATIC_ASSERT_MSG((result_t::value), 
Chris@102:                 "Target type is not std::istream`able and std::wistream`s are not supported by your STL implementation");
Chris@102:             typedef char type;
Chris@102: #else
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
Chris@102:                 result_t::value, char, wchar_t
Chris@102:             >::type type;
Chris@102:             
Chris@102:             BOOST_STATIC_ASSERT_MSG((result_t::value || boost::has_right_shift<std::basic_istream<wchar_t>, T >::value), 
Chris@102:                 "Target type is neither std::istream`able nor std::wistream`able");
Chris@102: #endif
Chris@102:         };
Chris@102:     } 
Chris@102: 
Chris@102:     namespace detail  // deduce_target_char<T> and deduce_source_char<T>
Chris@102:     {
Chris@102:         // We deduce stream character types in two stages.
Chris@102:         //
Chris@102:         // Stage 1 is common for Target and Source. At Stage 1 we get 
Chris@102:         // non normalized character type (may contain unsigned/signed char)
Chris@102:         // or deduce_character_type_later<T> where T is the original type.
Chris@102:         // Stage 1 is executed by stream_char_common<T>
Chris@102:         //
Chris@102:         // At Stage 2 we normalize character types or try to deduce character 
Chris@102:         // type using metafunctions. 
Chris@102:         // Stage 2 is executed by deduce_target_char_impl<T> and 
Chris@102:         // deduce_source_char_impl<T>
Chris@102:         //
Chris@102:         // deduce_target_char<T> and deduce_source_char<T> functions combine 
Chris@102:         // both stages
Chris@102: 
Chris@102:         template < class T >
Chris@102:         struct deduce_target_char
Chris@102:         {
Chris@102:             typedef BOOST_DEDUCED_TYPENAME stream_char_common< T >::type stage1_type;
Chris@102:             typedef BOOST_DEDUCED_TYPENAME deduce_target_char_impl< stage1_type >::type stage2_type;
Chris@102: 
Chris@102:             typedef stage2_type type;
Chris@102:         };
Chris@102: 
Chris@102:         template < class T >
Chris@102:         struct deduce_source_char
Chris@102:         {
Chris@102:             typedef BOOST_DEDUCED_TYPENAME stream_char_common< T >::type stage1_type;
Chris@102:             typedef BOOST_DEDUCED_TYPENAME deduce_source_char_impl< stage1_type >::type stage2_type;
Chris@102: 
Chris@102:             typedef stage2_type type;
Chris@102:         };
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail // extract_char_traits template
Chris@102:     {
Chris@102:         // We are attempting to get char_traits<> from T
Chris@102:         // template parameter. Otherwise we'll be using std::char_traits<Char>
Chris@102:         template < class Char, class T >
Chris@102:         struct extract_char_traits
Chris@102:                 : boost::false_type
Chris@102:         {
Chris@102:             typedef std::char_traits< Char > trait_t;
Chris@102:         };
Chris@102: 
Chris@102:         template < class Char, class Traits, class Alloc >
Chris@102:         struct extract_char_traits< Char, std::basic_string< Char, Traits, Alloc > >
Chris@102:             : boost::true_type
Chris@102:         {
Chris@102:             typedef Traits trait_t;
Chris@102:         };
Chris@102: 
Chris@102:         template < class Char, class Traits, class Alloc>
Chris@102:         struct extract_char_traits< Char, boost::container::basic_string< Char, Traits, Alloc > >
Chris@102:             : boost::true_type
Chris@102:         {
Chris@102:             typedef Traits trait_t;
Chris@102:         };
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail // array_to_pointer_decay<T>
Chris@102:     {
Chris@102:         template<class T>
Chris@102:         struct array_to_pointer_decay
Chris@102:         {
Chris@102:             typedef T type;
Chris@102:         };
Chris@102: 
Chris@102:         template<class T, std::size_t N>
Chris@102:         struct array_to_pointer_decay<T[N]>
Chris@102:         {
Chris@102:             typedef const T * type;
Chris@102:         };
Chris@102:     }
Chris@102:     
Chris@102:     namespace detail // lcast_src_length
Chris@102:     {
Chris@102:         // Return max. length of string representation of Source;
Chris@102:         template< class Source,         // Source type of lexical_cast.
Chris@102:                   class Enable = void   // helper type
Chris@102:                 >
Chris@102:         struct lcast_src_length
Chris@102:         {
Chris@102:             BOOST_STATIC_CONSTANT(std::size_t, value = 1);
Chris@102:         };
Chris@102: 
Chris@102:         // Helper for integral types.
Chris@102:         // Notes on length calculation:
Chris@102:         // Max length for 32bit int with grouping "\1" and thousands_sep ',':
Chris@102:         // "-2,1,4,7,4,8,3,6,4,7"
Chris@102:         //  ^                    - is_signed
Chris@102:         //   ^                   - 1 digit not counted by digits10
Chris@102:         //    ^^^^^^^^^^^^^^^^^^ - digits10 * 2
Chris@102:         //
Chris@102:         // Constant is_specialized is used instead of constant 1
Chris@102:         // to prevent buffer overflow in a rare case when
Chris@102:         // <boost/limits.hpp> doesn't add missing specialization for
Chris@102:         // numeric_limits<T> for some integral type T.
Chris@102:         // When is_specialized is false, the whole expression is 0.
Chris@102:         template <class Source>
Chris@102:         struct lcast_src_length<
Chris@102:                     Source, BOOST_DEDUCED_TYPENAME boost::enable_if<boost::is_integral<Source> >::type
Chris@102:                 >
Chris@102:         {
Chris@102: #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
Chris@102:             BOOST_STATIC_CONSTANT(std::size_t, value =
Chris@102:                   std::numeric_limits<Source>::is_signed +
Chris@102:                   std::numeric_limits<Source>::is_specialized + /* == 1 */
Chris@102:                   std::numeric_limits<Source>::digits10 * 2
Chris@102:               );
Chris@102: #else
Chris@102:             BOOST_STATIC_CONSTANT(std::size_t, value = 156);
Chris@102:             BOOST_STATIC_ASSERT(sizeof(Source) * CHAR_BIT <= 256);
Chris@102: #endif
Chris@102:         };
Chris@102: 
Chris@102: #ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
Chris@102:         // Helper for floating point types.
Chris@102:         // -1.23456789e-123456
Chris@102:         // ^                   sign
Chris@102:         //  ^                  leading digit
Chris@102:         //   ^                 decimal point 
Chris@102:         //    ^^^^^^^^         lcast_precision<Source>::value
Chris@102:         //            ^        "e"
Chris@102:         //             ^       exponent sign
Chris@102:         //              ^^^^^^ exponent (assumed 6 or less digits)
Chris@102:         // sign + leading digit + decimal point + "e" + exponent sign == 5
Chris@102:         template<class Source>
Chris@102:         struct lcast_src_length<
Chris@102:                 Source, BOOST_DEDUCED_TYPENAME boost::enable_if<boost::is_float<Source> >::type
Chris@102:             >
Chris@102:         {
Chris@102:             BOOST_STATIC_ASSERT(
Chris@102:                     std::numeric_limits<Source>::max_exponent10 <=  999999L &&
Chris@102:                     std::numeric_limits<Source>::min_exponent10 >= -999999L
Chris@102:                 );
Chris@102: 
Chris@102:             BOOST_STATIC_CONSTANT(std::size_t, value =
Chris@102:                     5 + lcast_precision<Source>::value + 6
Chris@102:                 );
Chris@102:         };
Chris@102: #endif // #ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
Chris@102:     }
Chris@102: 
Chris@102:     namespace detail // lexical_cast_stream_traits<Source, Target>
Chris@102:     {
Chris@102:         template <class Source, class Target>
Chris@102:         struct lexical_cast_stream_traits {
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::detail::array_to_pointer_decay<Source>::type src;
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::remove_cv<src>::type            no_cv_src;
Chris@102:                 
Chris@102:             typedef boost::detail::deduce_source_char<no_cv_src>                           deduce_src_char_metafunc;
Chris@102:             typedef BOOST_DEDUCED_TYPENAME deduce_src_char_metafunc::type           src_char_t;
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::detail::deduce_target_char<Target>::type target_char_t;
Chris@102:                 
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::detail::widest_char<
Chris@102:                 target_char_t, src_char_t
Chris@102:             >::type char_type;
Chris@102: 
Chris@102: #if !defined(BOOST_NO_CXX11_CHAR16_T) && defined(BOOST_NO_CXX11_UNICODE_LITERALS)
Chris@102:             BOOST_STATIC_ASSERT_MSG(( !boost::is_same<char16_t, src_char_t>::value
Chris@102:                                         && !boost::is_same<char16_t, target_char_t>::value),
Chris@102:                 "Your compiler does not have full support for char16_t" );
Chris@102: #endif
Chris@102: #if !defined(BOOST_NO_CXX11_CHAR32_T) && defined(BOOST_NO_CXX11_UNICODE_LITERALS)
Chris@102:             BOOST_STATIC_ASSERT_MSG(( !boost::is_same<char32_t, src_char_t>::value
Chris@102:                                         && !boost::is_same<char32_t, target_char_t>::value),
Chris@102:                 "Your compiler does not have full support for char32_t" );
Chris@102: #endif
Chris@102: 
Chris@102:             typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
Chris@102:                 boost::detail::extract_char_traits<char_type, Target>::value,
Chris@102:                 BOOST_DEDUCED_TYPENAME boost::detail::extract_char_traits<char_type, Target>,
Chris@102:                 BOOST_DEDUCED_TYPENAME boost::detail::extract_char_traits<char_type, no_cv_src>
Chris@102:             >::type::trait_t traits;
Chris@102: 
Chris@102:             typedef boost::type_traits::ice_and<
Chris@102:                 boost::is_same<char, src_char_t>::value,                                  // source is not a wide character based type
Chris@102:                 boost::type_traits::ice_ne<sizeof(char), sizeof(target_char_t) >::value,  // target type is based on wide character
Chris@102:                 boost::type_traits::ice_not<
Chris@102:                     boost::detail::is_character<no_cv_src>::value                     // single character widening is optimized
Chris@102:                 >::value                                                                  // and does not requires stringbuffer
Chris@102:             >   is_string_widening_required_t;
Chris@102: 
Chris@102:             typedef boost::type_traits::ice_not< boost::type_traits::ice_or<
Chris@102:                 boost::is_integral<no_cv_src>::value,
Chris@102:                 boost::detail::is_character<
Chris@102:                     BOOST_DEDUCED_TYPENAME deduce_src_char_metafunc::stage1_type          // if we did not get character type at stage1
Chris@102:                 >::value                                                                  // then we have no optimization for that type
Chris@102:             >::value >   is_source_input_not_optimized_t;
Chris@102: 
Chris@102:             // If we have an optimized conversion for
Chris@102:             // Source, we do not need to construct stringbuf.
Chris@102:             BOOST_STATIC_CONSTANT(bool, requires_stringbuf = 
Chris@102:                 (boost::type_traits::ice_or<
Chris@102:                     is_string_widening_required_t::value, is_source_input_not_optimized_t::value
Chris@102:                 >::value)
Chris@102:             );
Chris@102:             
Chris@102:             typedef boost::detail::lcast_src_length<no_cv_src> len_t;
Chris@102:         };
Chris@102:     }
Chris@102:  
Chris@102:     namespace detail
Chris@102:     {
Chris@102:         template<typename Target, typename Source>
Chris@102:         struct lexical_converter_impl
Chris@102:         {
Chris@102:             typedef lexical_cast_stream_traits<Source, Target>  stream_trait;
Chris@102: 
Chris@102:             typedef detail::lexical_istream_limited_src<
Chris@102:                 BOOST_DEDUCED_TYPENAME stream_trait::char_type,
Chris@102:                 BOOST_DEDUCED_TYPENAME stream_trait::traits,
Chris@102:                 stream_trait::requires_stringbuf,
Chris@102:                 stream_trait::len_t::value + 1
Chris@102:             > i_interpreter_type;
Chris@102: 
Chris@102:             typedef detail::lexical_ostream_limited_src<
Chris@102:                 BOOST_DEDUCED_TYPENAME stream_trait::char_type,
Chris@102:                 BOOST_DEDUCED_TYPENAME stream_trait::traits
Chris@102:             > o_interpreter_type;
Chris@102: 
Chris@102:             static inline bool try_convert(const Source& arg, Target& result) {
Chris@102:                 i_interpreter_type i_interpreter;
Chris@102: 
Chris@102:                 // Disabling ADL, by directly specifying operators.
Chris@102:                 if (!(i_interpreter.operator <<(arg)))
Chris@102:                     return false;
Chris@102: 
Chris@102:                 o_interpreter_type out(i_interpreter.cbegin(), i_interpreter.cend());
Chris@102: 
Chris@102:                 // Disabling ADL, by directly specifying operators.
Chris@102:                 if(!(out.operator >>(result)))
Chris@102:                     return false;
Chris@102: 
Chris@102:                 return true;
Chris@102:             }
Chris@102:         };
Chris@102:     }
Chris@102: 
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #undef BOOST_LCAST_NO_WCHAR_T
Chris@102: 
Chris@102: #endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
Chris@102: