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

namespace std{struct text_encoding{staticconstexpr size_t max_name_length=63; // enumeration text_encoding::idenumclass id: int_least32_t{/* see description */};usingenum id; constexpr text_encoding()=default;constexprexplicit text_encoding(string_view enc)noexcept;constexpr text_encoding(id i)noexcept; constexpr id mib()constnoexcept;constexprconstchar* name()constnoexcept; // class text_encoding::aliases_viewstruct aliases_view;constexpr aliases_view aliases()constnoexcept; friendconstexprbool operator==(const text_encoding& encoding,const text_encoding& other)noexcept;friendconstexprbool operator==(const text_encoding& encoding, id i)noexcept; static consteval text_encoding literal()noexcept;static text_encoding environment();template<id i>staticbool environment_is(); private:    id mib_= id::unknown;// exposition onlychar name_[max_name_length+1]={0};// exposition only// exposition onlystaticconstexprbool/*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{enumclass 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};}