[libcxx-commits] [libcxx] Implement P1885R12: `<text_encoding>` header (PR #141312)
via libcxx-commits
libcxx-commits at lists.llvm.org
Fri May 23 19:45:00 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libcxx
Author: William Tran-Viet (smallp-o-p)
<details>
<summary>Changes</summary>
Resolve [#<!-- -->105373](https://github.com/llvm/llvm-project/issues/105373) and consequently [#<!-- -->118371](https://github.com/llvm/llvm-project/issues/118371)
First crack at `<text_encoding>`. Implementation is pretty similar to `libstdc++`.
---
Patch is 118.46 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/141312.diff
32 Files Affected:
- (modified) libcxx/docs/FeatureTestMacroTable.rst (+1-1)
- (modified) libcxx/docs/Status/Cxx2cPapers.csv (+2-2)
- (modified) libcxx/include/CMakeLists.txt (+2)
- (modified) libcxx/include/__locale (+9)
- (added) libcxx/include/__text_encoding/text_encoding.h (+1483)
- (modified) libcxx/include/module.modulemap.in (+7)
- (added) libcxx/include/text_encoding (+68)
- (modified) libcxx/include/version (+1-1)
- (modified) libcxx/modules/std.compat.cppm.in (-3)
- (modified) libcxx/modules/std.cppm.in (+3-3)
- (modified) libcxx/modules/std/text_encoding.inc (+3-6)
- (modified) libcxx/src/CMakeLists.txt (+1)
- (modified) libcxx/src/locale.cpp (+13)
- (added) libcxx/src/text_encoding.cpp (+49)
- (modified) libcxx/test/libcxx/transitive_includes/cxx26.csv (+15)
- (added) libcxx/test/std/language.support/support.limits/support.limits.general/text_encoding.version.compile.pass.cpp (+63)
- (modified) libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp (+5-11)
- (added) libcxx/test/std/localization/locales/locale/locale.members/encoding.pass.cpp (+56)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.ctor/default.pass.cpp (+39)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.ctor/id.pass.cpp (+56)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.ctor/string_view.pass.cpp (+73)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.eq/equal.id.pass.cpp (+69)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.eq/equal.pass.cpp (+66)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.members/aliases.pass.cpp (+37)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.members/environment.pass.cpp (+83)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.members/literal.pass.cpp (+49)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.members/text_encoding.aliases_view/begin.pass.cpp (+66)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.members/text_encoding.aliases_view/empty.pass.cpp (+64)
- (added) libcxx/test/std/utilities/text_encoding/text_encoding.members/text_encoding.aliases_view/front.pass.cpp (+66)
- (added) libcxx/test/support/test_text_encoding.h (+1173)
- (modified) libcxx/utils/generate_feature_test_macro_components.py (-1)
- (modified) libcxx/utils/libcxx/header_information.py (+2-1)
``````````diff
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index 9b57b7c8eeb52..93308e4078075 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -500,7 +500,7 @@ Status
---------------------------------------------------------- -----------------
``__cpp_lib_submdspan`` *unimplemented*
---------------------------------------------------------- -----------------
- ``__cpp_lib_text_encoding`` *unimplemented*
+ ``__cpp_lib_text_encoding`` ``202306L``
---------------------------------------------------------- -----------------
``__cpp_lib_to_chars`` *unimplemented*
---------------------------------------------------------- -----------------
diff --git a/libcxx/docs/Status/Cxx2cPapers.csv b/libcxx/docs/Status/Cxx2cPapers.csv
index 3809446a57896..a7dfa75df7c87 100644
--- a/libcxx/docs/Status/Cxx2cPapers.csv
+++ b/libcxx/docs/Status/Cxx2cPapers.csv
@@ -13,7 +13,7 @@
"`P2013R5 <https://wg21.link/P2013R5>`__","Freestanding Language: Optional ``::operator new``","2023-06 (Varna)","","",""
"`P2363R5 <https://wg21.link/P2363R5>`__","Extending associative containers with the remaining heterogeneous overloads","2023-06 (Varna)","","",""
"`P1901R2 <https://wg21.link/P1901R2>`__","Enabling the Use of ``weak_ptr`` as Keys in Unordered Associative Containers","2023-06 (Varna)","","",""
-"`P1885R12 <https://wg21.link/P1885R12>`__","Naming Text Encodings to Demystify Them","2023-06 (Varna)","","",""
+"`P1885R12 <https://wg21.link/P1885R12>`__","Naming Text Encodings to Demystify Them","2023-06 (Varna)","|Complete|","21",""
"`P0792R14 <https://wg21.link/P0792R14>`__","``function_ref``: a type-erased callable reference","2023-06 (Varna)","","",""
"`P2874R2 <https://wg21.link/P2874R2>`__","P2874R2: Mandating Annex D Require No More","2023-06 (Varna)","|Complete|","12",""
"`P2757R3 <https://wg21.link/P2757R3>`__","Type-checking format args","2023-06 (Varna)","","",""
@@ -79,7 +79,7 @@
"`P3136R1 <https://wg21.link/P3136R1>`__","Retiring niebloids","2024-11 (Wrocław)","|Complete|","14",""
"`P3138R5 <https://wg21.link/P3138R5>`__","``views::cache_latest``","2024-11 (Wrocław)","","",""
"`P3379R0 <https://wg21.link/P3379R0>`__","Constrain ``std::expected`` equality operators","2024-11 (Wrocław)","|Complete|","21",""
-"`P2862R1 <https://wg21.link/P2862R1>`__","``text_encoding::name()`` should never return null values","2024-11 (Wrocław)","","",""
+"`P2862R1 <https://wg21.link/P2862R1>`__","``text_encoding::name()`` should never return null values","2024-11 (Wrocław)","|Complete|","21",""
"`P2897R7 <https://wg21.link/P2897R7>`__","``aligned_accessor``: An ``mdspan`` accessor expressing pointer over-alignment","2024-11 (Wrocław)","|Complete|","21",""
"`P3355R1 <https://wg21.link/P3355R1>`__","Fix ``submdspan`` for C++26","2024-11 (Wrocław)","","",""
"`P3222R0 <https://wg21.link/P3222R0>`__","Fix C++26 by adding transposed special cases for P2642 layouts","2024-11 (Wrocław)","","",""
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index 43cefd5600646..ba61ee7c11e35 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -751,6 +751,7 @@ set(files
__system_error/error_condition.h
__system_error/system_error.h
__system_error/throw_system_error.h
+ __text_encoding/text_encoding.h
__thread/formatter.h
__thread/id.h
__thread/jthread.h
@@ -1062,6 +1063,7 @@ set(files
strstream
syncstream
system_error
+ text_encoding
tgmath.h
thread
tuple
diff --git a/libcxx/include/__locale b/libcxx/include/__locale
index d6c6ef19627ff..4da3f38ac408f 100644
--- a/libcxx/include/__locale
+++ b/libcxx/include/__locale
@@ -31,6 +31,10 @@
# include <cstddef>
# include <cstring>
+# if _LIBCPP_STD_VER >= 26
+# include <__text_encoding/text_encoding.h>
+# endif
+
# if _LIBCPP_HAS_WIDE_CHARACTERS
# include <cwchar>
# else
@@ -99,6 +103,11 @@ public:
// locale operations:
string name() const;
+
+# if _LIBCPP_STD_VER >= 26 && __CHAR_BIT__ == 8
+ text_encoding encoding() const;
+# endif // _LIBCPP_STD_VER >= 26
+
bool operator==(const locale&) const;
# if _LIBCPP_STD_VER <= 17
_LIBCPP_HIDE_FROM_ABI bool operator!=(const locale& __y) const { return !(*this == __y); }
diff --git a/libcxx/include/__text_encoding/text_encoding.h b/libcxx/include/__text_encoding/text_encoding.h
new file mode 100644
index 0000000000000..93d0ae2ab6b89
--- /dev/null
+++ b/libcxx/include/__text_encoding/text_encoding.h
@@ -0,0 +1,1483 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___TEXT_ENCODING_TEXT_ENCODING_H
+#define _LIBCPP___TEXT_ENCODING_TEXT_ENCODING_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+#if _LIBCPP_HAS_LOCALIZATION
+
+#include <__algorithm/copy_n.h>
+#include <__algorithm/lower_bound.h>
+#include <__algorithm/min.h>
+#include <__functional/hash.h>
+#include <__iterator/iterator_traits.h>
+#include <__locale_dir/locale_base_api.h>
+#include <__ranges/view_interface.h>
+#include <__string/char_traits.h>
+#include <__utility/unreachable.h>
+#include <cstdint>
+#include <string_view>
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+#if _LIBCPP_STD_VER >= 26
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+struct _LIBCPP_EXPORTED_FROM_ABI text_encoding {
+ static constexpr size_t max_name_length = 63;
+
+private:
+ struct __encoding_data {
+ using __id_rep _LIBCPP_NODEBUG = int_least32_t;
+ __id_rep __mib_rep;
+ const char* __name;
+
+ friend constexpr bool operator==(const __encoding_data& __e, const __encoding_data& __other) _NOEXCEPT {
+ return __e.__mib_rep == __other.__mib_rep || __comp_name(__e.__name, __other.__name);
+ }
+
+ friend constexpr bool operator<(const __encoding_data& __e, const __id_rep __i) _NOEXCEPT {
+ return __e.__mib_rep < __i;
+ }
+ };
+
+public:
+ enum class id : __encoding_data::__id_rep {
+ 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,
+ NATSDANO = 33,
+ NATSDANOADD = 34,
+ 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,
+ IBBM904 = 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,
+ reserved = 3000
+ };
+
+ using enum id;
+
+ _LIBCPP_HIDE_FROM_ABI constexpr text_encoding() = default;
+ _LIBCPP_HIDE_FROM_ABI constexpr explicit text_encoding(string_view __enc) _NOEXCEPT
+ : __encoding_rep_(__find_encoding_data(__enc)) {
+ __enc.copy(__name_, max_name_length, 0);
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr text_encoding(id __i) _NOEXCEPT : __encoding_rep_(__find_encoding_data_by_id(__i)) {
+ if (__encoding_rep_->__name[0] != '\0')
+ std::copy_n(__encoding_rep_->__name, std::char_traits<char>::length(__encoding_rep_->__name), __name_);
+ }
+
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr id mib() const _NOEXCEPT { return id(__encoding_rep_->__mib_rep); }
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr const char* name() const _NOEXCEPT { return __name_; }
+
+ // [text.encoding.aliases], class text_encoding::aliases_view
+ struct aliases_view : ranges::view_interface<aliases_view> {
+ constexpr aliases_view() = default;
+ constexpr aliases_view(const __encoding_data* __d) : __view_data_(__d) {}
+ struct __end_sentinel {};
+ struct __iterator {
+ using value_type = const char*;
+ using reference = const char*;
+ using difference_type = ptrdiff_t;
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator() noexcept = default;
+
+ _LIBCPP_HIDE_FROM_ABI constexpr value_type operator*() const {
+ if (__can_dereference())
+ return __data_->__name;
+ std::unreachable();
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr value_type operator[](difference_type __n) const {
+ auto __it = *this;
+ return *(__it + __n);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator+(__iterator __it, difference_type __n) {
+ __it += __n;
+ return __it;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator+(difference_type __n, __iterator __it) {
+ __it += __n;
+ return __it;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator-(__iterator __it, difference_type __n) {
+ __it -= __n;
+ return __it;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr difference_type operator-(const __iterator& __other) const
+ {
+ if(__other.__mib_rep_ == __mib_rep_)
+ return __mib_rep_ - __other.__mib_rep_;
+ std::unreachable();
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator-(difference_type __n, __iterator& __it) {
+ __it -= __n;
+ return __it;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator++() {
+ __data_++;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator++(int) {
+ auto __old = *this;
+ __data_++;
+ return __old;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator--() {
+ __data_--;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator--(int) {
+ auto __old = *this;
+ __data_--;
+ return __old;
+ }
+
+ // Check if going past the encoding data list array and if the new index has the same id, if not then
+ // replace it with a sentinel "out-of-bounds" iterator.
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator+=(difference_type __n) {
+ if (__data_) [[__likely__]] {
+ if (__n > 0) {
+ if ((__data_ + __n) < std::end(__text_encoding_data) && __data_[__n - 1].__mib_rep == __mib_rep_)
+ __data_ += __n;
+ else
+ *this = __iterator{};
+ } else if (__n < 0) {
+ if ((__data_ + __n) > __text_encoding_data && __data_[__n].__mib_rep == __mib_rep_)
+ __data_ += __n;
+ else
+ *this = __iterator{};
+ }
+ }
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator-=(difference_type __n) { return operator+=(-__n); }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const __iterator& __it) const {
+ return __data_ == __it.__data_ && __it.__mib_rep_ == __mib_rep_;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator==(__end_sentinel) const { return !__can_dereference(); }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(__iterator __it) const { return __data_ <=> __it.__data_; }
+
+ private:
+ friend struct text_encoding;
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __iterator(const __encoding_data* __enc_d) noexcept
+ ...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/141312
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