Standard library header <text_encoding> (C++26)

namespace std {
  // text_encoding
  struct text_encoding;
  // hash support for text_encoding
  template<class T> struct hash;
  template<> struct hash<text_encoding>;
}

namespace std {
  struct text_encoding {
    static constexpr size_t max_name_length = 63;
    // enumeration text_encoding::id
    enum class id : int_least32_t {
      /* see description */
    };
    using enum id;
    constexpr text_encoding() = default;
    constexpr explicit text_encoding(string_view enc) noexcept;
    constexpr text_encoding(id i) noexcept;
    constexpr id mib() const noexcept;
    constexpr const char* name() const noexcept;
    // class text_encoding::aliases_view
    struct aliases_view;
    constexpr aliases_view aliases() const noexcept;
    friend constexpr bool operator==(const text_encoding& encoding,
                                     const text_encoding& other) noexcept;
    friend constexpr bool operator==(const text_encoding& encoding, id i) noexcept;
    static consteval text_encoding literal() noexcept;
    static text_encoding environment();
    template<id i> static bool environment_is();
  private:
    id mib_ = id::unknown;                                              // exposition only
    char name_[max_name_length + 1] = {0};                              // exposition only
    // exposition only
    static constexpr bool /*comp-name*/(string_view a, string_view b);
  };
}

struct text_encoding::aliases_view : ranges::view_interface<text_encoding::aliases_view> {
  constexpr /* implementation-defined */ begin() const;
  constexpr /* implementation-defined */ end() const;
};

namespace std {
  enum class text_encoding::id : int_least32_t {
    other = 1,
    unknown = 2,
    ASCII = 3,
    ISOLatin1 = 4,
    ISOLatin2 = 5,
    ISOLatin3 = 6,
    ISOLatin4 = 7,
    ISOLatinCyrillic = 8,
    ISOLatinArabic = 9,
    ISOLatinGreek = 10,
    ISOLatinHebrew = 11,
    ISOLatin5 = 12,
    ISOLatin6 = 13,
    ISOTextComm = 14,
    HalfWidthKatakana = 15,
    JISEncoding = 16,
    ShiftJIS = 17,
    EUCPkdFmtJapanese = 18,
    EUCFixWidJapanese = 19,
    ISO4UnitedKingdom = 20,
    ISO11SwedishForNames = 21,
    ISO15Italian = 22,
    ISO17Spanish = 23,
    ISO21German = 24,
    ISO60DanishNorwegian = 25,
    ISO69French = 26,
    ISO10646UTF1 = 27,
    ISO646basic1983 = 28,
    INVARIANT = 29,
    ISO2IntlRefVersion = 30,
    NATSSEFI = 31,
    NATSSEFIADD = 32,
    ISO10Swedish = 35,
    KSC56011987 = 36,
    ISO2022KR = 37,
    EUCKR = 38,
    ISO2022JP = 39,
    ISO2022JP2 = 40,
    ISO13JISC6220jp = 41,
    ISO14JISC6220ro = 42,
    ISO16Portuguese = 43,
    ISO18Greek7Old = 44,
    ISO19LatinGreek = 45,
    ISO25French = 46,
    ISO27LatinGreek1 = 47,
    ISO5427Cyrillic = 48,
    ISO42JISC62261978 = 49,
    ISO47BSViewdata = 50,
    ISO49INIS = 51,
    ISO50INIS8 = 52,
    ISO51INISCyrillic = 53,
    ISO54271981 = 54,
    ISO5428Greek = 55,
    ISO57GB1988 = 56,
    ISO58GB231280 = 57,
    ISO61Norwegian2 = 58,
    ISO70VideotexSupp1 = 59,
    ISO84Portuguese2 = 60,
    ISO85Spanish2 = 61,
    ISO86Hungarian = 62,
    ISO87JISX0208 = 63,
    ISO88Greek7 = 64,
    ISO89ASMO449 = 65,
    ISO90 = 66,
    ISO91JISC62291984a = 67,
    ISO92JISC62991984b = 68,
    ISO93JIS62291984badd = 69,
    ISO94JIS62291984hand = 70,
    ISO95JIS62291984handadd = 71,
    ISO96JISC62291984kana = 72,
    ISO2033 = 73,
    ISO99NAPLPS = 74,
    ISO102T617bit = 75,
    ISO103T618bit = 76,
    ISO111ECMACyrillic = 77,
    ISO121Canadian1 = 78,
    ISO122Canadian2 = 79,
    ISO123CSAZ24341985gr = 80,
    ISO88596E = 81,
    ISO88596I = 82,
    ISO128T101G2 = 83,
    ISO88598E = 84,
    ISO88598I = 85,
    ISO139CSN369103 = 86,
    ISO141JUSIB1002 = 87,
    ISO143IECP271 = 88,
    ISO146Serbian = 89,
    ISO147Macedonian = 90,
    ISO150 = 91,
    ISO151Cuba = 92,
    ISO6937Add = 93,
    ISO153GOST1976874 = 94,
    ISO8859Supp = 95,
    ISO10367Box = 96,
    ISO158Lap = 97,
    ISO159JISX02121990 = 98,
    ISO646Danish = 99,
    USDK = 100,
    DKUS = 101,
    KSC5636 = 102,
    Unicode11UTF7 = 103,
    ISO2022CN = 104,
    ISO2022CNEXT = 105,
    UTF8 = 106,
    ISO885913 = 109,
    ISO885914 = 110,
    ISO885915 = 111,
    ISO885916 = 112,
    GBK = 113,
    GB18030 = 114,
    OSDEBCDICDF0415 = 115,
    OSDEBCDICDF03IRV = 116,
    OSDEBCDICDF041 = 117,
    ISO115481 = 118,
    KZ1048 = 119,
    UCS2 = 1000,
    UCS4 = 1001,
    UnicodeASCII = 1002,
    UnicodeLatin1 = 1003,
    UnicodeJapanese = 1004,
    UnicodeIBM1261 = 1005,
    UnicodeIBM1268 = 1006,
    UnicodeIBM1276 = 1007,
    UnicodeIBM1264 = 1008,
    UnicodeIBM1265 = 1009,
    Unicode11 = 1010,
    SCSU = 1011,
    UTF7 = 1012,
    UTF16BE = 1013,
    UTF16LE = 1014,
    UTF16 = 1015,
    CESU8 = 1016,
    UTF32 = 1017,
    UTF32BE = 1018,
    UTF32LE = 1019,
    BOCU1 = 1020,
    UTF7IMAP = 1021,
    Windows30Latin1 = 2000,
    Windows31Latin1 = 2001,
    Windows31Latin2 = 2002,
    Windows31Latin5 = 2003,
    HPRoman8 = 2004,
    AdobeStandardEncoding = 2005,
    VenturaUS = 2006,
    VenturaInternational = 2007,
    DECMCS = 2008,
    PC850Multilingual = 2009,
    PC8DanishNorwegian = 2012,
    PC862LatinHebrew = 2013,
    PC8Turkish = 2014,
    IBMSymbols = 2015,
    IBMThai = 2016,
    HPLegal = 2017,
    HPPiFont = 2018,
    HPMath8 = 2019,
    HPPSMath = 2020,
    HPDesktop = 2021,
    VenturaMath = 2022,
    MicrosoftPublishing = 2023,
    Windows31J = 2024,
    GB2312 = 2025,
    Big5 = 2026,
    Macintosh = 2027,
    IBM037 = 2028,
    IBM038 = 2029,
    IBM273 = 2030,
    IBM274 = 2031,
    IBM275 = 2032,
    IBM277 = 2033,
    IBM278 = 2034,
    IBM280 = 2035,
    IBM281 = 2036,
    IBM284 = 2037,
    IBM285 = 2038,
    IBM290 = 2039,
    IBM297 = 2040,
    IBM420 = 2041,
    IBM423 = 2042,
    IBM424 = 2043,
    PC8CodePage437 = 2011,
    IBM500 = 2044,
    IBM851 = 2045,
    PCp852 = 2010,
    IBM855 = 2046,
    IBM857 = 2047,
    IBM860 = 2048,
    IBM861 = 2049,
    IBM863 = 2050,
    IBM864 = 2051,
    IBM865 = 2052,
    IBM868 = 2053,
    IBM869 = 2054,
    IBM870 = 2055,
    IBM871 = 2056,
    IBM880 = 2057,
    IBM891 = 2058,
    IBM903 = 2059,
    IBM904 = 2060,
    IBM905 = 2061,
    IBM918 = 2062,
    IBM1026 = 2063,
    IBMEBCDICATDE = 2064,
    EBCDICATDEA = 2065,
    EBCDICCAFR = 2066,
    EBCDICDKNO = 2067,
    EBCDICDKNOA = 2068,
    EBCDICFISE = 2069,
    EBCDICFISEA = 2070,
    EBCDICFR = 2071,
    EBCDICIT = 2072,
    EBCDICPT = 2073,
    EBCDICES = 2074,
    EBCDICESA = 2075,
    EBCDICESS = 2076,
    EBCDICUK = 2077,
    EBCDICUS = 2078,
    Unknown8BiT = 2079,
    Mnemonic = 2080,
    Mnem = 2081,
    VISCII = 2082,
    VIQR = 2083,
    KOI8R = 2084,
    HZGB2312 = 2085,
    IBM866 = 2086,
    PC775Baltic = 2087,
    KOI8U = 2088,
    IBM00858 = 2089,
    IBM00924 = 2090,
    IBM01140 = 2091,
    IBM01141 = 2092,
    IBM01142 = 2093,
    IBM01143 = 2094,
    IBM01144 = 2095,
    IBM01145 = 2096,
    IBM01146 = 2097,
    IBM01147 = 2098,
    IBM01148 = 2099,
    IBM01149 = 2100,
    Big5HKSCS = 2101,
    IBM1047 = 2102,
    PTCP154 = 2103,
    Amiga1251 = 2104,
    KOI7switched = 2105,
    BRF = 2106,
    TSCII = 2107,
    CP51932 = 2108,
    windows874 = 2109,
    windows1250 = 2250,
    windows1251 = 2251,
    windows1252 = 2252,
    windows1253 = 2253,
    windows1254 = 2254,
    windows1255 = 2255,
    windows1256 = 2256,
    windows1257 = 2257,
    windows1258 = 2258,
    TIS620 = 2259,
    CP50220 = 2260
  };
}