c_ctype.hpp

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    typedef wctype_t char_class_type;
    BOOST_MPL_ASSERT_RELATION(0x81FF, ==, (_ALPHA|_UPPER|_LOWER|_DIGIT|_SPACE|_PUNCT|_CONTROL|_BLANK|_HEX|_LEADBYTE));
    BOOST_STATIC_CONSTANT(int, char_class_underscore = 0x1000);
    BOOST_STATIC_CONSTANT(int, char_class_newline = 0x2000);

    template<typename FwdIter>
    static char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase)
    {
        using namespace std;
        wstring const name = classname_w(begin, end);
        if(name == L"alnum")    return _ALPHA|_DIGIT;
        if(name == L"alpha")    return _ALPHA;
        if(name == L"blank")    return _BLANK; // this is ONLY space!!!
        if(name == L"cntrl")    return _CONTROL;
        if(name == L"d")        return _DIGIT;
        if(name == L"digit")    return _DIGIT;
        if(name == L"graph")    return _PUNCT|_ALPHA|_DIGIT;
        if(name == L"lower")    return icase ? (_LOWER|_UPPER) : _LOWER;
        if(name == L"newline")  return char_class_newline;
        if(name == L"print")    return _BLANK|_PUNCT|_ALPHA|_DIGIT;
        if(name == L"punct")    return _PUNCT;
        if(name == L"s")        return _SPACE;
        if(name == L"space")    return _SPACE;
        if(name == L"upper")    return icase ? (_UPPER|_LOWER) : _UPPER;
        if(name == L"w")        return _ALPHA|_DIGIT|char_class_underscore;
        if(name == L"xdigit")   return _HEX;
        return 0;
    }

    static bool isctype(wchar_t ch, char_class_type mask)
    {
        using namespace std;
        if(0 != iswctype(ch, mask))
        {
            return true;
        }

        switch(ch)
        {
        case L'\t': return 0 != (mask & _BLANK);
        case L'_': return 0 != (mask & char_class_underscore);
        case L'\n': case L'\r': case L'\f': case 0x2028u: case 0x2029u: case 0x85u:
            return 0 != (mask & char_class_newline);
        default:;
        }

        return false;
    }
};
#endif


#elif defined(__CYGWIN__)



///////////////////////////////////////////////////////////////////////////////
//
template<>
struct char_class_impl<char>
{
    typedef int char_class_type;
    BOOST_MPL_ASSERT_RELATION(0377, ==, (_U|_L|_N|_S|_P|_C|_B|_X));
    BOOST_STATIC_CONSTANT(int, char_class_underscore = 0400);
    BOOST_STATIC_CONSTANT(int, char_class_newline = 01000);

    template<typename FwdIter>
    static char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase)
    {
        using namespace std;
        string const name = classname_a(begin, end);
        if(name == "alnum")     return _U|_L|_N;
        if(name == "alpha")     return _U|_L;
        if(name == "blank")     return _B; // BUGBUG what is this?
        if(name == "cntrl")     return _C;
        if(name == "d")         return _N;
        if(name == "digit")     return _N;
        if(name == "graph")     return _P|_U|_L|_N;
        if(name == "lower")     return icase ? (_L|_U) : _L;
        if(name == "newline")   return char_class_newline;
        if(name == "print")     return _B|_P|_U|_L|_N;
        if(name == "punct")     return _P;
        if(name == "s")         return _S;
        if(name == "space")     return _S;
        if(name == "upper")     return icase ? (_U|_L) : _U;
        if(name == "w")         return _U|_L|_N|char_class_underscore;
        if(name == "xdigit")    return _X;
        return 0;
    }

    static bool isctype(char ch, char_class_type mask)
    {
        if(0 != static_cast<unsigned char>(((_ctype_+1)[(unsigned)(ch)]) & mask))
        {
            return true;
        }

        switch(ch)
        {
        case '_': return 0 != (mask & char_class_underscore);
        case '\n': case '\r': case '\f': return 0 != (mask & char_class_newline);
        default:;
        }

        return false;
    }
};

#ifndef BOOST_XPRESSIVE_NO_WREGEX
///////////////////////////////////////////////////////////////////////////////
//
template<>
struct char_class_impl<wchar_t>
{
    typedef int char_class_type;
    //BOOST_STATIC_CONSTANT(int, char_class_alnum         = 0x0001);
    BOOST_STATIC_CONSTANT(int, char_class_alpha         = 0x0002);
    BOOST_STATIC_CONSTANT(int, char_class_blank         = 0x0004);
    BOOST_STATIC_CONSTANT(int, char_class_cntrl         = 0x0008);
    BOOST_STATIC_CONSTANT(int, char_class_digit         = 0x0010);
    //BOOST_STATIC_CONSTANT(int, char_class_graph         = 0x0020);
    BOOST_STATIC_CONSTANT(int, char_class_lower         = 0x0040);
    //BOOST_STATIC_CONSTANT(int, char_class_print         = 0x0080);
    BOOST_STATIC_CONSTANT(int, char_class_punct         = 0x0100);
    BOOST_STATIC_CONSTANT(int, char_class_space         = 0x0200);
    BOOST_STATIC_CONSTANT(int, char_class_upper         = 0x0400);
    BOOST_STATIC_CONSTANT(int, char_class_underscore    = 0x0800);
    BOOST_STATIC_CONSTANT(int, char_class_xdigit        = 0x1000);
    BOOST_STATIC_CONSTANT(int, char_class_newline       = 0x2000);

    template<typename FwdIter>
    static char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase)
    {
        using namespace std;
        wstring const name = classname_w(begin, end);
        if(name == L"alnum")    return char_class_alpha|char_class_digit;
        if(name == L"alpha")    return char_class_alpha;
        if(name == L"blank")    return char_class_blank;
        if(name == L"cntrl")    return char_class_cntrl;
        if(name == L"d")        return char_class_digit;
        if(name == L"digit")    return char_class_digit;
        if(name == L"graph")    return char_class_punct|char_class_alpha|char_class_digit;
        if(name == L"lower")    return icase ? (char_class_lower|char_class_upper) : char_class_lower;
        if(name == L"newline")  return char_class_newline;
        if(name == L"print")    return char_class_blank|char_class_punct|char_class_alpha|char_class_digit;
        if(name == L"punct")    return char_class_punct;
        if(name == L"s")        return char_class_space;
        if(name == L"space")    return char_class_space;
        if(name == L"upper")    return icase ? (char_class_upper|char_class_lower) : char_class_upper;
        if(name == L"w")        return char_class_alpha|char_class_digit|char_class_underscore;
        if(name == L"xdigit")   return char_class_xdigit;
        return 0;
    }

    static bool isctype(wchar_t ch, char_class_type mask)
    {
        using namespace std;
        return ((char_class_alpha & mask) && iswalpha(ch))
            || ((char_class_blank & mask) && (L' ' == ch || L'\t' == ch)) // BUGBUG
            || ((char_class_cntrl & mask) && iswcntrl(ch))
            || ((char_class_digit & mask) && iswdigit(ch))
            || ((char_class_lower & mask) && iswlower(ch))
            || ((char_class_newline & mask) && detail::iswnewline(ch))
            || ((char_class_punct & mask) && iswpunct(ch))
            || ((char_class_space & mask) && iswspace(ch))
            || ((char_class_upper & mask) && iswupper(ch))
            || ((char_class_underscore & mask) && L'_' == ch)
            || ((char_class_xdigit & mask) && iswxdigit(ch))
            ;
    }
};
#endif



#elif defined(__GLIBC__)




///////////////////////////////////////////////////////////////////////////////
//
template<>
struct char_class_impl<char>
{
    typedef int char_class_type;
    BOOST_MPL_ASSERT_RELATION(0xffff, ==, (_ISalnum|_ISalpha|_ISblank|_IScntrl|_ISdigit|_ISgraph|
                                           _ISlower|_ISprint|_ISpunct|_ISspace|_ISupper|_ISxdigit|0xffff));
    BOOST_STATIC_CONSTANT(int, char_class_underscore = 0x00010000);
    BOOST_STATIC_CONSTANT(int, char_class_newline = 0x00020000);

    template<typename FwdIter>
    static char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase)
    {
        using namespace std;
        string const name = classname_a(begin, end);
        if(name == "alnum")     return _ISalnum;
        if(name == "alpha")     return _ISalpha;
        if(name == "blank")     return _ISblank;
        if(name == "cntrl")     return _IScntrl;
        if(name == "d")         return _ISdigit;
        if(name == "digit")     return _ISdigit;
        if(name == "graph")     return _ISgraph;
        if(name == "lower")     return icase ? (_ISlower|_ISupper) : _ISlower;
        if(name == "print")     return _ISprint;
        if(name == "newline")   return char_class_newline;
        if(name == "punct")     return _ISpunct;
        if(name == "s")         return _ISspace;
        if(name == "space")     return _ISspace;
        if(name == "upper")     return icase ? (_ISupper|_ISlower) : _ISupper;
        if(name == "w")         return _ISalnum|char_class_underscore;
        if(name == "xdigit")    return _ISxdigit;
        return 0;
    }

    static bool isctype(char ch, char_class_type mask)
    {
        using namespace std;
        if(0 != __isctype(static_cast<unsigned char>(ch), mask))
        {
            return true;
        }

        switch(ch)
        {
        case '_': return 0 != (mask & char_class_underscore);
        case '\n': case '\r': case '\f': return 0 != (mask & char_class_newline);
        default:;
        }

        return false;
    }
};

#ifndef BOOST_XPRESSIVE_NO_WREGEX
///////////////////////////////////////////////////////////////////////////////
//
template<>
struct char_class_impl<wchar_t>
{
    typedef int char_class_type;
    //BOOST_STATIC_CONSTANT(int, char_class_alnum         = 0x0001);
    BOOST_STATIC_CONSTANT(int, char_class_alpha         = 0x0002);
    BOOST_STATIC_CONSTANT(int, char_class_blank         = 0x0004);
    BOOST_STATIC_CONSTANT(int, char_class_cntrl         = 0x0008);
    BOOST_STATIC_CONSTANT(int, char_class_digit         = 0x0010);
    //BOOST_STATIC_CONSTANT(int, char_class_graph         = 0x0020);
    BOOST_STATIC_CONSTANT(int, char_class_lower         = 0x0040);
    //BOOST_STATIC_CONSTANT(int, char_class_print         = 0x0080);
    BOOST_STATIC_CONSTANT(int, char_class_punct         = 0x0100);
    BOOST_STATIC_CONSTANT(int, char_class_space         = 0x0200);
    BOOST_STATIC_CONSTANT(int, char_class_upper         = 0x0400);
    BOOST_STATIC_CONSTANT(int, char_class_underscore    = 0x0800);
    BOOST_STATIC_CONSTANT(int, char_class_xdigit        = 0x1000);
    BOOST_STATIC_CONSTANT(int, char_class_newline       = 0x2000);

    template<typename FwdIter>
    static char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase)
    {
        using namespace std;
        wstring const name = classname_w(begin, end);
        if(name == L"alnum")    return char_class_alpha|char_class_digit;
        if(name == L"alpha")    return char_class_alpha;
        if(name == L"blank")    return char_class_blank;
        if(name == L"cntrl")    return char_class_cntrl;
        if(name == L"d")        return char_class_digit;
        if(name == L"digit")    return char_class_digit;
        if(name == L"graph")    return char_class_punct|char_class_alpha|char_class_digit;
        if(name == L"lower")    return icase ? (char_class_lower|char_class_upper) : char_class_lower;
        if(name == L"newline")  return char_class_newline;
        if(name == L"print")    return char_class_blank|char_class_punct|char_class_alpha|char_class_digit;
        if(name == L"punct")    return char_class_punct;
        if(name == L"s")        return char_class_space;
        if(name == L"space")    return char_class_space;
        if(name == L"upper")    return icase ? (char_class_upper|char_class_lower) : char_class_upper;
        if(name == L"w")        return char_class_alpha|char_class_digit|char_class_underscore;
        if(name == L"xdigit")   return char_class_xdigit;
        return 0;
    }

    static bool isctype(wchar_t ch, char_class_type mask)