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 ///////////////////////////////////////////////////////////////////////////////
 /// \file cpp_regex_traits.hpp
 /// Contains the definition of the cpp_regex_traits\<\> template, which is a
 /// wrapper for std::locale that can be used to customize the behavior of
 /// static and dynamic regexes.
 //
 //  Copyright 2008 Eric Niebler. 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 BOOST_XPRESSIVE_TRAITS_CPP_REGEX_TRAITS_HPP_EAN_10_04_2005
 #define BOOST_XPRESSIVE_TRAITS_CPP_REGEX_TRAITS_HPP_EAN_10_04_2005
 
 // MS compatible compilers support #pragma once
 #if defined(_MSC_VER)
 # pragma once
 #endif
 
 #include <ios>
 #include <string>
 #include <locale>
 #include <sstream>
 #include <climits>
 #include <boost/config.hpp>
 #include <boost/assert.hpp>
 #include <boost/integer.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/static_assert.hpp>
 #include <boost/detail/workaround.hpp>
 #include <boost/type_traits/is_same.hpp>
 #include <boost/xpressive/detail/detail_fwd.hpp>
 #include <boost/xpressive/detail/utility/literals.hpp>
 
 // From John Maddock:
 // Fix for gcc prior to 3.4: std::ctype<wchar_t> doesn't allow masks to be combined, for example:
 // std::use_facet<std::ctype<wchar_t> >(locale()).is(std::ctype_base::lower|std::ctype_base::upper, L'a');
 // incorrectly returns false.
 // NOTE: later version of the gcc define __GLIBCXX__, not __GLIBCPP__
 #if BOOST_WORKAROUND(__GLIBCPP__, != 0)
 # define BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
 #endif
 
 namespace boost { namespace xpressive
 {
 
 namespace detail
 {
     // define an unsigned integral typedef of the same size as std::ctype_base::mask
     typedef boost::uint_t<sizeof(std::ctype_base::mask) * CHAR_BIT>::least umask_t;
     BOOST_MPL_ASSERT_RELATION(sizeof(std::ctype_base::mask), ==, sizeof(umask_t));
 
     // Calculate what the size of the umaskex_t type should be to fix the 3 extra bitmasks
     //   11 char categories in ctype_base
     // +  3 extra categories for xpressive
     // = 14 total bits needed
     int const umaskex_bits = (14 > (sizeof(umask_t) * CHAR_BIT)) ? 14 : sizeof(umask_t) * CHAR_BIT;
 
     // define an unsigned integral type with at least umaskex_bits
     typedef boost::uint_t<umaskex_bits>::fast umaskex_t;
     BOOST_MPL_ASSERT_RELATION(sizeof(umask_t), <=, sizeof(umaskex_t));
 
     // cast a ctype mask to a umaskex_t
     template<std::ctype_base::mask Mask>
     struct mask_cast
     {
         BOOST_STATIC_CONSTANT(umaskex_t, value = static_cast<umask_t>(Mask));
     };
 
     #ifdef __CYGWIN__
     // Work around a gcc warning on cygwin
     template<>
     struct mask_cast<std::ctype_base::print>
     {
         BOOST_MPL_ASSERT_RELATION('\227', ==, std::ctype_base::print);
         BOOST_STATIC_CONSTANT(umaskex_t, value = 0227);
     };
     #endif
 
     #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
     template<std::ctype_base::mask Mask>
     umaskex_t const mask_cast<Mask>::value;
     #endif
 
     #ifndef BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
     // an unsigned integer with the highest bit set
     umaskex_t const highest_bit = static_cast<umaskex_t>(1) << (sizeof(umaskex_t) * CHAR_BIT - 1);
 
     ///////////////////////////////////////////////////////////////////////////////
     // unused_mask
     //   find a bit in an int that isn't set
     template<umaskex_t In, umaskex_t Out = highest_bit, bool Done = (0 == (Out & In))>
     struct unused_mask
     {
         BOOST_STATIC_ASSERT(1 != Out);
         BOOST_STATIC_CONSTANT(umaskex_t, value = (unused_mask<In, (Out >> 1)>::value));
     };
 
     template<umaskex_t In, umaskex_t Out>
     struct unused_mask<In, Out, true>
     {
         BOOST_STATIC_CONSTANT(umaskex_t, value = Out);
     };
 
     #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
     template<umaskex_t In, umaskex_t Out, bool Done>
     umaskex_t const unused_mask<In, Out, Done>::value;
     #endif
 
     umaskex_t const std_ctype_alnum = mask_cast<std::ctype_base::alnum>::value;
     umaskex_t const std_ctype_alpha = mask_cast<std::ctype_base::alpha>::value;
     umaskex_t const std_ctype_cntrl = mask_cast<std::ctype_base::cntrl>::value;
     umaskex_t const std_ctype_digit = mask_cast<std::ctype_base::digit>::value;
     umaskex_t const std_ctype_graph = mask_cast<std::ctype_base::graph>::value;
     umaskex_t const std_ctype_lower = mask_cast<std::ctype_base::lower>::value;
     umaskex_t const std_ctype_print = mask_cast<std::ctype_base::print>::value;
     umaskex_t const std_ctype_punct = mask_cast<std::ctype_base::punct>::value;
     umaskex_t const std_ctype_space = mask_cast<std::ctype_base::space>::value;
     umaskex_t const std_ctype_upper = mask_cast<std::ctype_base::upper>::value;
     umaskex_t const std_ctype_xdigit = mask_cast<std::ctype_base::xdigit>::value;
 
     // Reserve some bits for the implementation
     #if defined(__GLIBCXX__)
     umaskex_t const std_ctype_reserved = 0x8000;
     #elif defined(_CPPLIB_VER) && defined(BOOST_WINDOWS)
     umaskex_t const std_ctype_reserved = 0x8200;
     #elif defined(_LIBCPP_VERSION)
     umaskex_t const std_ctype_reserved = 0x8000;
     #else
     umaskex_t const std_ctype_reserved = 0;
     #endif
 
     // Bitwise-or all the ctype masks together
     umaskex_t const all_ctype_masks = std_ctype_reserved
       | std_ctype_alnum | std_ctype_alpha | std_ctype_cntrl | std_ctype_digit
       | std_ctype_graph | std_ctype_lower | std_ctype_print | std_ctype_punct
       | std_ctype_space | std_ctype_upper | std_ctype_xdigit;
 
     // define a new mask for "underscore" ("word" == alnum | underscore)
     umaskex_t const non_std_ctype_underscore = unused_mask<all_ctype_masks>::value;
 
     // define a new mask for "blank"
     umaskex_t const non_std_ctype_blank = unused_mask<all_ctype_masks | non_std_ctype_underscore>::value;
 
     // define a new mask for "newline"
     umaskex_t const non_std_ctype_newline = unused_mask<all_ctype_masks | non_std_ctype_underscore | non_std_ctype_blank>::value;
 
     #else
     ///////////////////////////////////////////////////////////////////////////////
     // Ugly work-around for buggy ctype facets.
     umaskex_t const std_ctype_alnum = 1 << 0;
     umaskex_t const std_ctype_alpha = 1 << 1;
     umaskex_t const std_ctype_cntrl = 1 << 2;
     umaskex_t const std_ctype_digit = 1 << 3;
     umaskex_t const std_ctype_graph = 1 << 4;
     umaskex_t const std_ctype_lower = 1 << 5;
     umaskex_t const std_ctype_print = 1 << 6;
     umaskex_t const std_ctype_punct = 1 << 7;
     umaskex_t const std_ctype_space = 1 << 8;
     umaskex_t const std_ctype_upper = 1 << 9;
     umaskex_t const std_ctype_xdigit = 1 << 10;
     umaskex_t const non_std_ctype_underscore = 1 << 11;
     umaskex_t const non_std_ctype_blank = 1 << 12;
     umaskex_t const non_std_ctype_newline = 1 << 13;
 
     static umaskex_t const std_masks[] =
     {
         mask_cast<std::ctype_base::alnum>::value
       , mask_cast<std::ctype_base::alpha>::value
       , mask_cast<std::ctype_base::cntrl>::value
       , mask_cast<std::ctype_base::digit>::value
       , mask_cast<std::ctype_base::graph>::value
       , mask_cast<std::ctype_base::lower>::value
       , mask_cast<std::ctype_base::print>::value
       , mask_cast<std::ctype_base::punct>::value
       , mask_cast<std::ctype_base::space>::value
       , mask_cast<std::ctype_base::upper>::value
       , mask_cast<std::ctype_base::xdigit>::value
     };
 
     inline int mylog2(umaskex_t i)
     {
         return "\0\0\1\0\2\0\0\0\3"[i & 0xf]
              + "\0\4\5\0\6\0\0\0\7"[(i & 0xf0) >> 04]
              + "\0\10\11\0\12\0\0\0\13"[(i & 0xf00) >> 010];
     }
     #endif
 
     // convenient constant for the extra masks
     umaskex_t const non_std_ctype_masks = non_std_ctype_underscore | non_std_ctype_blank | non_std_ctype_newline;
 
     ///////////////////////////////////////////////////////////////////////////////
     // cpp_regex_traits_base
     //   BUGBUG this should be replaced with a regex facet that lets you query for
     //   an array of underscore characters and an array of line separator characters.
     template<typename Char, std::size_t SizeOfChar = sizeof(Char)>
     struct cpp_regex_traits_base
     {
     protected:
         void imbue(std::locale const &)
         {
         }
 
         static bool is(std::ctype<Char> const &ct, Char ch, umaskex_t mask)
         {
             #ifndef BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
 
             if(ct.is((std::ctype_base::mask)(umask_t)mask, ch))
             {
                 return true;
             }
 
             // HACKHACK Cygwin and mingw have buggy ctype facets for wchar_t
             #if defined(__CYGWIN__) || defined(__MINGW32_VERSION)
             if (std::ctype_base::xdigit == ((std::ctype_base::mask)(umask_t)mask & std::ctype_base::xdigit))
             {
                 typename std::char_traits<Char>::int_type i = std::char_traits<Char>::to_int_type(ch);
                 if(UCHAR_MAX >= i && std::isxdigit(static_cast<int>(i)))
                     return true;
             }
             #endif
 
             #else
 
             umaskex_t tmp = mask & ~non_std_ctype_masks;
             for(umaskex_t i; 0 != (i = (tmp & (~tmp+1))); tmp &= ~i)
             {
                 std::ctype_base::mask m = (std::ctype_base::mask)(umask_t)std_masks[mylog2(i)];
                 if(ct.is(m, ch))
                 {
                     return true;
                 }
             }
 
             #endif
 
             return ((mask & non_std_ctype_blank) && cpp_regex_traits_base::is_blank(ch))
                 || ((mask & non_std_ctype_underscore) && cpp_regex_traits_base::is_underscore(ch))
                 || ((mask & non_std_ctype_newline) && cpp_regex_traits_base::is_newline(ch));
         }
 
     private:
         static bool is_blank(Char ch)
         {
             BOOST_MPL_ASSERT_RELATION('\t', ==, L'\t');
             BOOST_MPL_ASSERT_RELATION(' ', ==, L' ');
             return L' ' == ch || L'\t' == ch;
         }
 
         static bool is_underscore(Char ch)
         {
             BOOST_MPL_ASSERT_RELATION('_', ==, L'_');
             return L'_' == ch;
         }
 
         static bool is_newline(Char ch)
         {
             BOOST_MPL_ASSERT_RELATION('\r', ==, L'\r');
             BOOST_MPL_ASSERT_RELATION('\n', ==, L'\n');
             BOOST_MPL_ASSERT_RELATION('\f', ==, L'\f');
             return L'\r' == ch || L'\n' == ch || L'\f' == ch
                 || (1 < SizeOfChar && (0x2028u == ch || 0x2029u == ch || 0x85u == ch));
         }
     };
 
     #ifndef BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
 
     template<typename Char>
     struct cpp_regex_traits_base<Char, 1>
     {
     protected:
         void imbue(std::locale const &loc)
         {
             int i = 0;
             Char allchars[UCHAR_MAX + 1];
             for(i = 0; i <= static_cast<int>(UCHAR_MAX); ++i)
             {
                 allchars[i] = static_cast<Char>(i);
             }
 
             std::ctype<Char> const &ct = BOOST_USE_FACET(std::ctype<Char>, loc);
             std::ctype_base::mask tmp[UCHAR_MAX + 1];
             ct.is(allchars, allchars + UCHAR_MAX + 1, tmp);
             for(i = 0; i <= static_cast<int>(UCHAR_MAX); ++i)
             {
                 this->masks_[i] = static_cast<umask_t>(tmp[i]);
                 BOOST_ASSERT(0 == (this->masks_[i] & non_std_ctype_masks));
             }
 
             this->masks_[static_cast<unsigned char>('_')] |= non_std_ctype_underscore;
             this->masks_[static_cast<unsigned char>(' ')] |= non_std_ctype_blank;
             this->masks_[static_cast<unsigned char>('\t')] |= non_std_ctype_blank;
             this->masks_[static_cast<unsigned char>('\n')] |= non_std_ctype_newline;
             this->masks_[static_cast<unsigned char>('\r')] |= non_std_ctype_newline;
             this->masks_[static_cast<unsigned char>('\f')] |= non_std_ctype_newline;
         }
 
         bool is(std::ctype<Char> const &, Char ch, umaskex_t mask) const
         {
             return 0 != (this->masks_[static_cast<unsigned char>(ch)] & mask);
         }
 
     private:
         umaskex_t masks_[UCHAR_MAX + 1];
     };
 
     #endif
 
 } // namespace detail
 
 
 ///////////////////////////////////////////////////////////////////////////////
 // cpp_regex_traits
 //
 /// \brief Encapsaulates a \c std::locale for use by the
 /// \c basic_regex\<\> class template.
 template<typename Char>
 struct cpp_regex_traits
   : detail::cpp_regex_traits_base<Char>
 {
     typedef Char char_type;
     typedef std::basic_string<char_type> string_type;
     typedef std::locale locale_type;
     typedef detail::umaskex_t char_class_type;
     typedef regex_traits_version_2_tag version_tag;
     typedef detail::cpp_regex_traits_base<Char> base_type;
 
     /// Initialize a cpp_regex_traits object to use the specified std::locale,
     /// or the global std::locale if none is specified.
     ///
     cpp_regex_traits(locale_type const &loc = locale_type())
       : base_type()
       , loc_()
     {
         this->imbue(loc);
     }
 
     /// Checks two cpp_regex_traits objects for equality
     ///
     /// \return this->getloc() == that.getloc().
     bool operator ==(cpp_regex_traits<char_type> const &that) const
     {
         return this->loc_ == that.loc_;
     }
 
     /// Checks two cpp_regex_traits objects for inequality
     ///
     /// \return this->getloc() != that.getloc().
     bool operator !=(cpp_regex_traits<char_type> const &that) const
     {
         return this->loc_ != that.loc_;
     }
 
     /// Convert a char to a Char
     ///
     /// \param ch The source character.
     /// \return std::use_facet\<std::ctype\<char_type\> \>(this->getloc()).widen(ch).
     char_type widen(char ch) const
     {
         return this->ctype_->widen(ch);
     }
 
     /// Returns a hash value for a Char in the range [0, UCHAR_MAX]
     ///
     /// \param ch The source character.
     /// \return a value between 0 and UCHAR_MAX, inclusive.
     static unsigned char hash(char_type ch)
     {
         return static_cast<unsigned char>(std::char_traits<Char>::to_int_type(ch));
     }
 
     /// No-op
     ///
     /// \param ch The source character.
     /// \return ch
     static char_type translate(char_type ch)
     {
         return ch;
     }
 
     /// Converts a character to lower-case using the internally-stored std::locale.
     ///
     /// \param ch The source character.
     /// \return std::tolower(ch, this->getloc()).
     char_type translate_nocase(char_type ch) const
     {
         return this->ctype_->tolower(ch);
     }
 
     /// Converts a character to lower-case using the internally-stored std::locale.
     ///
     /// \param ch The source character.
     /// \return std::tolower(ch, this->getloc()).
     char_type tolower(char_type ch) const
     {
         return this->ctype_->tolower(ch);
     }
 
     /// Converts a character to upper-case using the internally-stored std::locale.
     ///
     /// \param ch The source character.
     /// \return std::toupper(ch, this->getloc()).
     char_type toupper(char_type ch) const
     {
         return this->ctype_->toupper(ch);
     }
 
     /// Returns a \c string_type containing all the characters that compare equal
     /// disregrarding case to the one passed in. This function can only be called
     /// if <tt>has_fold_case\<cpp_regex_traits\<Char\> \>::value</tt> is \c true.
     ///
     /// \param ch The source character.
     /// \return \c string_type containing all chars which are equal to \c ch when disregarding
     ///     case
     string_type fold_case(char_type ch) const
     {
         BOOST_MPL_ASSERT((is_same<char_type, char>));
         char_type ntcs[] = {
             this->ctype_->tolower(ch)
           , this->ctype_->toupper(ch)
           , 0
         };
         if(ntcs[1] == ntcs[0])
             ntcs[1] = 0;
         return string_type(ntcs);
     }
 
     /// Checks to see if a character is within a character range.
     ///
     /// \param first The bottom of the range, inclusive.
     /// \param last The top of the range, inclusive.
     /// \param ch The source character.
     /// \return first <= ch && ch <= last.
     static bool in_range(char_type first, char_type last, char_type ch)
     {
         return first <= ch && ch <= last;
     }
 
     /// Checks to see if a character is within a character range, irregardless of case.
     ///
     /// \param first The bottom of the range, inclusive.
     /// \param last The top of the range, inclusive.
     /// \param ch The source character.
     /// \return in_range(first, last, ch) || in_range(first, last, tolower(ch, this->getloc())) ||
     ///     in_range(first, last, toupper(ch, this->getloc()))
     /// \attention The default implementation doesn't do proper Unicode
     ///     case folding, but this is the best we can do with the standard
     ///     ctype facet.
     bool in_range_nocase(char_type first, char_type last, char_type ch) const
     {
         // NOTE: this default implementation doesn't do proper Unicode
         // case folding, but this is the best we can do with the standard
         // std::ctype facet.
         return this->in_range(first, last, ch)
             || this->in_range(first, last, this->ctype_->toupper(ch))
             || this->in_range(first, last, this->ctype_->tolower(ch));
     }
 
     /// INTERNAL ONLY
     //string_type transform(char_type const *begin, char_type const *end) const
     //{
     //    return this->collate_->transform(begin, end);
     //}
 
     /// Returns a sort key for the character sequence designated by the iterator range [F1, F2)
     /// such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2)
     /// then v.transform(G1, G2) \< v.transform(H1, H2).
     ///
     /// \attention Not currently used
     template<typename FwdIter>
     string_type transform(FwdIter, FwdIter) const
     {
         //string_type str(begin, end);
         //return this->transform(str.data(), str.data() + str.size());
 
         BOOST_ASSERT(false);
         return string_type();
     }
 
     /// Returns a sort key for the character sequence designated by the iterator range [F1, F2)
     /// such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2)
     /// when character case is not considered then
     /// v.transform_primary(G1, G2) \< v.transform_primary(H1, H2).
     ///
     /// \attention Not currently used
     template<typename FwdIter>
     string_type transform_primary(FwdIter, FwdIter ) const
     {
         BOOST_ASSERT(false); // TODO implement me
         return string_type();
     }
 
     /// Returns a sequence of characters that represents the collating element
     /// consisting of the character sequence designated by the iterator range [F1, F2).
     /// Returns an empty string if the character sequence is not a valid collating element.
     ///
     /// \attention Not currently used
     template<typename FwdIter>
     string_type lookup_collatename(FwdIter, FwdIter) const
     {
         BOOST_ASSERT(false); // TODO implement me
         return string_type();
     }
 
     /// For the character class name represented by the specified character sequence,
     /// return the corresponding bitmask representation.
     ///
     /// \param begin A forward iterator to the start of the character sequence representing
     ///     the name of the character class.
     /// \param end The end of the character sequence.
     /// \param icase Specifies whether the returned bitmask should represent the case-insensitive
     ///     version of the character class.
     /// \return A bitmask representing the character class.
     template<typename FwdIter>
     char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase) const
     {
         static detail::umaskex_t const icase_masks =
             detail::std_ctype_lower | detail::std_ctype_upper;
 
         BOOST_ASSERT(begin != end);
         char_class_type char_class = this->lookup_classname_impl_(begin, end);
         if(0 == char_class)
         {
             // convert the string to lowercase
             string_type classname(begin, end);
             for(typename string_type::size_type i = 0, len = classname.size(); i < len; ++i)
             {
                 classname[i] = this->translate_nocase(classname[i]);
             }
             char_class = this->lookup_classname_impl_(classname.begin(), classname.end());
         }
         // erase case-sensitivity if icase==true
         if(icase && 0 != (char_class & icase_masks))
         {
             char_class |= icase_masks;
         }
         return char_class;
     }
 
     /// Tests a character against a character class bitmask.
     ///
     /// \param ch The character to test.
     /// \param mask The character class bitmask against which to test.
     /// \pre mask is a bitmask returned by lookup_classname, or is several such masks bit-or'ed
     ///     together.
     /// \return true if the character is a member of any of the specified character classes, false
     ///     otherwise.
     bool isctype(char_type ch, char_class_type mask) const
     {
         return this->base_type::is(*this->ctype_, ch, mask);
     }
 
     /// Convert a digit character into the integer it represents.
     ///
     /// \param ch The digit character.
     /// \param radix The radix to use for the conversion.
     /// \pre radix is one of 8, 10, or 16.
     /// \return -1 if ch is not a digit character, the integer value of the character otherwise.
     ///     The conversion is performed by imbueing a std::stringstream with this-\>getloc();
     ///     setting the radix to one of oct, hex or dec; inserting ch into the stream; and
     ///     extracting an int.
     int value(char_type ch, int radix) const
     {
         BOOST_ASSERT(8 == radix || 10 == radix || 16 == radix);
         int val = -1;
         std::basic_stringstream<char_type> str;
         str.imbue(this->getloc());
         str << (8 == radix ? std::oct : (16 == radix ? std::hex : std::dec));
         str.put(ch);
         str >> val;
         return str.fail() ? -1 : val;
     }
 
     /// Imbues *this with loc
     ///
     /// \param loc A std::locale.
     /// \return the previous std::locale used by *this.
     locale_type imbue(locale_type loc)
     {
         locale_type old_loc = this->loc_;
         this->loc_ = loc;
         this->ctype_ = &BOOST_USE_FACET(std::ctype<char_type>, this->loc_);
         //this->collate_ = &BOOST_USE_FACET(std::collate<char_type>, this->loc_);
         this->base_type::imbue(this->loc_);
         return old_loc;
     }
 
     /// Returns the current std::locale used by *this.
     ///
     locale_type getloc() const
     {
         return this->loc_;
     }
 
 private:
 
     ///////////////////////////////////////////////////////////////////////////////
     // char_class_pair
     /// INTERNAL ONLY
     struct char_class_pair
     {
         char_type const *class_name_;
         char_class_type class_type_;
     };
 
     ///////////////////////////////////////////////////////////////////////////////
     // char_class
     /// INTERNAL ONLY
     static char_class_pair const &char_class(std::size_t j)
     {
         static BOOST_CONSTEXPR_OR_CONST char_class_pair s_char_class_map[] =
         {
             { BOOST_XPR_CSTR_(char_type, "alnum"),  detail::std_ctype_alnum }
           , { BOOST_XPR_CSTR_(char_type, "alpha"),  detail::std_ctype_alpha }
           , { BOOST_XPR_CSTR_(char_type, "blank"),  detail::non_std_ctype_blank }
           , { BOOST_XPR_CSTR_(char_type, "cntrl"),  detail::std_ctype_cntrl }
           , { BOOST_XPR_CSTR_(char_type, "d"),      detail::std_ctype_digit }
           , { BOOST_XPR_CSTR_(char_type, "digit"),  detail::std_ctype_digit }
           , { BOOST_XPR_CSTR_(char_type, "graph"),  detail::std_ctype_graph }
           , { BOOST_XPR_CSTR_(char_type, "lower"),  detail::std_ctype_lower }
           , { BOOST_XPR_CSTR_(char_type, "newline"),detail::non_std_ctype_newline }
           , { BOOST_XPR_CSTR_(char_type, "print"),  detail::std_ctype_print }
           , { BOOST_XPR_CSTR_(char_type, "punct"),  detail::std_ctype_punct }
           , { BOOST_XPR_CSTR_(char_type, "s"),      detail::std_ctype_space }
           , { BOOST_XPR_CSTR_(char_type, "space"),  detail::std_ctype_space }
           , { BOOST_XPR_CSTR_(char_type, "upper"),  detail::std_ctype_upper }
           , { BOOST_XPR_CSTR_(char_type, "w"),      detail::std_ctype_alnum | detail::non_std_ctype_underscore }
           , { BOOST_XPR_CSTR_(char_type, "xdigit"), detail::std_ctype_xdigit }
           , { 0, 0 }
         };
         return s_char_class_map[j];
     }
 
     ///////////////////////////////////////////////////////////////////////////////
     // lookup_classname_impl
     /// INTERNAL ONLY
     template<typename FwdIter>
     static char_class_type lookup_classname_impl_(FwdIter begin, FwdIter end)
     {
         // find the classname
         typedef cpp_regex_traits<Char> this_t;
         for(std::size_t j = 0; 0 != this_t::char_class(j).class_name_; ++j)
         {
             if(this_t::compare_(this_t::char_class(j).class_name_, begin, end))
             {
                 return this_t::char_class(j).class_type_;
             }
         }
         return 0;
     }
 
     /// INTERNAL ONLY
     template<typename FwdIter>
     static bool compare_(char_type const *name, FwdIter begin, FwdIter end)
     {
         for(; *name && begin != end; ++name, ++begin)
         {
             if(*name != *begin)
             {
                 return false;
             }
         }
         return !*name && begin == end;
     }
 
     locale_type loc_;
     std::ctype<char_type> const *ctype_;
     //std::collate<char_type> const *collate_;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 // cpp_regex_traits<>::hash specializations
 template<>
 inline unsigned char cpp_regex_traits<unsigned char>::hash(unsigned char ch)
 {
     return ch;
 }
 
 template<>
 inline unsigned char cpp_regex_traits<char>::hash(char ch)
 {
     return static_cast<unsigned char>(ch);
 }
 
 template<>
 inline unsigned char cpp_regex_traits<signed char>::hash(signed char ch)
 {
     return static_cast<unsigned char>(ch);
 }
 
 #ifndef BOOST_XPRESSIVE_NO_WREGEX
 template<>
 inline unsigned char cpp_regex_traits<wchar_t>::hash(wchar_t ch)
 {
     return static_cast<unsigned char>(ch);
 }
 #endif
 
 // Narrow C++ traits has fold_case() member function.
 template<>
 struct has_fold_case<cpp_regex_traits<char> >
   : mpl::true_
 {
 };
 
 
 }}
 
 #endif

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