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?? ..
?? alphaindex.h(26.43 KB)
?? appendable.h(8.54 KB)
?? basictz.h(9.99 KB)
?? brkiter.h(28.52 KB)
?? bytestream.h(11.79 KB)
?? bytestrie.h(20.83 KB)
?? bytestriebuilder.h(7.44 KB)
?? calendar.h(110.47 KB)
?? caniter.h(7.47 KB)
?? casemap.h(25.42 KB)
?? char16ptr.h(10.79 KB)
?? chariter.h(23.79 KB)
?? choicfmt.h(23.99 KB)
?? coleitr.h(13.78 KB)
?? coll.h(59.5 KB)
?? compactdecimalformat.h(6.88 KB)
?? curramt.h(3.67 KB)
?? currpinf.h(7.3 KB)
?? currunit.h(4.02 KB)
?? datefmt.h(41.29 KB)
?? dbbi.h(1.19 KB)
?? dcfmtsym.h(21.27 KB)
?? decimfmt.h(87.45 KB)
?? displayoptions.h(7.08 KB)
?? docmain.h(7.66 KB)
?? dtfmtsym.h(41.04 KB)
?? dtintrv.h(3.84 KB)
?? dtitvfmt.h(49.2 KB)
?? dtitvinf.h(18.54 KB)
?? dtptngen.h(29.28 KB)
?? dtrule.h(8.66 KB)
?? edits.h(20.74 KB)
?? enumset.h(2.08 KB)
?? errorcode.h(4.84 KB)
?? fieldpos.h(8.69 KB)
?? filteredbrk.h(5.37 KB)
?? fmtable.h(24.36 KB)
?? format.h(12.78 KB)
?? formattednumber.h(6.25 KB)
?? formattedvalue.h(9.75 KB)
?? fpositer.h(3.03 KB)
?? gender.h(3.35 KB)
?? gregocal.h(30.05 KB)
?? icudataver.h(1.02 KB)
?? icuplug.h(12.1 KB)
?? idna.h(12.93 KB)
?? listformatter.h(8.59 KB)
?? localebuilder.h(11.09 KB)
?? localematcher.h(26.86 KB)
?? localpointer.h(19.52 KB)
?? locdspnm.h(7.12 KB)
?? locid.h(53.98 KB)
?? measfmt.h(11.41 KB)
?? measunit.h(133.12 KB)
?? measure.h(4.63 KB)
?? messageformat2.h(21.59 KB)
?? messageformat2_arguments.h(3.84 KB)
?? messageformat2_data_model.h(96.61 KB)
?? messageformat2_data_model_names.h(784 B)
?? messageformat2_formattable.h(39.37 KB)
?? messageformat2_function_registry.h(18.07 KB)
?? messagepattern.h(33.79 KB)
?? msgfmt.h(44.94 KB)
?? normalizer2.h(34.68 KB)
?? normlzr.h(30.79 KB)
?? nounit.h(2.24 KB)
?? numberformatter.h(90.72 KB)
?? numberrangeformatter.h(25.68 KB)
?? numfmt.h(50.16 KB)
?? numsys.h(7.22 KB)
?? parseerr.h(3.08 KB)
?? parsepos.h(5.56 KB)
?? platform.h(27.19 KB)
?? plurfmt.h(25.46 KB)
?? plurrule.h(20.63 KB)
?? ptypes.h(2.16 KB)
?? putil.h(6.32 KB)
?? rbbi.h(31.73 KB)
?? rbnf.h(57.19 KB)
?? rbtz.h(15.75 KB)
?? regex.h(83.83 KB)
?? region.h(9.2 KB)
?? reldatefmt.h(22.69 KB)
?? rep.h(9.38 KB)
?? resbund.h(18.02 KB)
?? schriter.h(6.09 KB)
?? scientificnumberformatter.h(6.44 KB)
?? search.h(22.21 KB)
?? selfmt.h(14.35 KB)
?? simpleformatter.h(12.6 KB)
?? simplenumberformatter.h(8.87 KB)
?? simpletz.h(45.62 KB)
?? smpdtfmt.h(57.57 KB)
?? sortkey.h(11.13 KB)
?? std_string.h(1.05 KB)
?? strenum.h(9.96 KB)
?? stringoptions.h(5.79 KB)
?? stringpiece.h(10.29 KB)
?? stringtriebuilder.h(15.53 KB)
?? stsearch.h(21.43 KB)
?? symtable.h(4.28 KB)
?? tblcoll.h(38.79 KB)
?? timezone.h(45.59 KB)
?? tmunit.h(3.37 KB)
?? tmutamt.h(4.9 KB)
?? tmutfmt.h(7.42 KB)
?? translit.h(65.81 KB)
?? tzfmt.h(44.76 KB)
?? tznames.h(16.85 KB)
?? tzrule.h(34.81 KB)
?? tztrans.h(6.11 KB)
?? ubidi.h(89.61 KB)
?? ubiditransform.h(12.71 KB)
?? ubrk.h(24.43 KB)
?? ucal.h(63.95 KB)
?? ucasemap.h(15.27 KB)
?? ucat.h(5.35 KB)
?? uchar.h(152.33 KB)
?? ucharstrie.h(22.59 KB)
?? ucharstriebuilder.h(7.48 KB)
?? uchriter.h(13.24 KB)
?? uclean.h(11.21 KB)
?? ucnv.h(83.34 KB)
?? ucnv_cb.h(6.58 KB)
?? ucnv_err.h(20.98 KB)
?? ucnvsel.h(6.24 KB)
?? ucol.h(67.35 KB)
?? ucoleitr.h(9.82 KB)
?? uconfig.h(12.56 KB)
?? ucpmap.h(5.54 KB)
?? ucptrie.h(22.51 KB)
?? ucsdet.h(14.69 KB)
?? ucurr.h(16.72 KB)
?? udat.h(62.66 KB)
?? udata.h(15.63 KB)
?? udateintervalformat.h(11.93 KB)
?? udatpg.h(30.13 KB)
?? udisplaycontext.h(5.94 KB)
?? udisplayoptions.h(8.86 KB)
?? uenum.h(7.79 KB)
?? ufieldpositer.h(4.41 KB)
?? uformattable.h(10.97 KB)
?? uformattednumber.h(8.09 KB)
?? uformattedvalue.h(12.25 KB)
?? ugender.h(2.06 KB)
?? uidna.h(34.12 KB)
?? uiter.h(22.75 KB)
?? uldnames.h(10.48 KB)
?? ulistformatter.h(10.78 KB)
?? uloc.h(55.38 KB)
?? ulocale.h(6.31 KB)
?? ulocbuilder.h(16.69 KB)
?? ulocdata.h(11.3 KB)
?? umachine.h(15.25 KB)
?? umisc.h(1.34 KB)
?? umsg.h(24.25 KB)
?? umutablecptrie.h(8.3 KB)
?? unifilt.h(4 KB)
?? unifunct.h(4.05 KB)
?? unimatch.h(6.1 KB)
?? unirepl.h(3.38 KB)
?? uniset.h(70.18 KB)
?? unistr.h(184.51 KB)
?? unorm.h(20.55 KB)
?? unorm2.h(25.66 KB)
?? unum.h(55.16 KB)
?? unumberformatter.h(19.68 KB)
?? unumberoptions.h(5.23 KB)
?? unumberrangeformatter.h(15.35 KB)
?? unumsys.h(7.26 KB)
?? uobject.h(10.6 KB)
?? upluralrules.h(8.79 KB)
?? uregex.h(71.99 KB)
?? uregion.h(9.81 KB)
?? ureldatefmt.h(16.98 KB)
?? urename.h(142.22 KB)
?? urep.h(5.38 KB)
?? ures.h(36.65 KB)
?? uscript.h(28.95 KB)
?? usearch.h(39.21 KB)
?? uset.h(63.03 KB)
?? usetiter.h(9.63 KB)
?? ushape.h(18 KB)
?? usimplenumberformatter.h(7.31 KB)
?? uspoof.h(80 KB)
?? usprep.h(8.19 KB)
?? ustdio.h(38.58 KB)
?? ustream.h(1.89 KB)
?? ustring.h(72.16 KB)
?? ustringtrie.h(3.15 KB)
?? utext.h(58.1 KB)
?? utf.h(8.65 KB)
?? utf16.h(23.35 KB)
?? utf32.h(763 B)
?? utf8.h(31.65 KB)
?? utf_old.h(45.85 KB)
?? utfiterator.h(95.02 KB)
?? utfstring.h(4.89 KB)
?? utmscale.h(13.78 KB)
?? utrace.h(17.18 KB)
?? utrans.h(25.54 KB)
?? utypes.h(36.73 KB)
?? uvernum.h(6.33 KB)
?? uversion.h(8.21 KB)
?? vtzone.h(20.68 KB)

Editing: utfstring.h

// © 2025 and later: Unicode, Inc. and others.
// License & terms of use: https://www.unicode.org/copyright.html

// utfstring.h
// created: 2025jul18 Markus W. Scherer

#ifndef __UTFSTRING_H__
#define __UTFSTRING_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API || U_SHOW_CPLUSPLUS_HEADER_API || !defined(UTYPES_H)

#include "unicode/utf16.h"

/**
 * \file
 * \brief C++ header-only API: C++ string helper functions.
 */

#ifndef U_HIDE_DRAFT_API

namespace U_HEADER_ONLY_NAMESPACE {
namespace utfstring {

// Write code points to strings -------------------------------------------- ***

#ifndef U_IN_DOXYGEN
namespace prv {

// This function, and the public wrappers,
// want to be U_FORCE_INLINE but the gcc-debug-build-and-test CI check failed with
// error: ‘always_inline’ function might not be inlinable [-Werror=attributes]
template<typename StringClass, bool validate>
inline StringClass &appendCodePoint(StringClass &s, uint32_t c) {
    using Unit = typename StringClass::value_type;
    if constexpr (sizeof(Unit) == 1) {
        // UTF-8: Similar to U8_APPEND().
        if (c <= 0x7f) {
            s.push_back(static_cast<Unit>(c));
        } else {
            Unit buf[4];
            uint8_t len;
            if (c <= 0x7ff) {
                len = 2;
                buf[2] = (c >> 6) | 0xc0;
            } else {
                if (validate ?
                        c < 0xd800 ||
                            (c < 0xe000 || c > 0x10ffff ? (c = 0xfffd, true) : c <= 0xffff) :
                        c <= 0xffff) {
                    len = 3;
                    buf[1] = (c >> 12) | 0xe0;
                } else {
                    len = 4;
                    buf[0] = (c >> 18) | 0xf0;
                    buf[1] = ((c >> 12) & 0x3f) | 0x80;
                }
                buf[2] = ((c >> 6) & 0x3f) | 0x80;
            }
            buf[3] = (c & 0x3f) | 0x80;
            s.append(buf + 4 - len, len);
        }
    } else if constexpr (sizeof(Unit) == 2) {
        // UTF-16: Similar to U16_APPEND().
        if (validate ?
                c < 0xd800 || (c < 0xe000 || c > 0x10ffff ? (c = 0xfffd, true) : c <= 0xffff) :
                c <= 0xffff) {
            s.push_back(static_cast<Unit>(c));
        } else {
            Unit buf[2] = { U16_LEAD(c), U16_TRAIL(c) };
            s.append(buf, 2);
        }
    } else {
        // UTF-32
        s.push_back(!validate || U_IS_SCALAR_VALUE(c) ? c : 0xfffd);
    }
    return s;
}

}  // namespace prv
#endif  // U_IN_DOXYGEN

#ifndef U_HIDE_DRAFT_API
/**
 * Appends the code point to the string.
 * Appends the U+FFFD replacement character instead if c is not a scalar value.
 * See https://www.unicode.org/glossary/#unicode_scalar_value
 *
 * @tparam StringClass A version of std::basic_string (or a compatible type)
 * @param s The string to append to
 * @param c The code point to append
 * @return s
 * @draft ICU 78
 * @see U_IS_SCALAR_VALUE
 */
template<typename StringClass>
inline StringClass &appendOrFFFD(StringClass &s, UChar32 c) {
    return prv::appendCodePoint<StringClass, true>(s, c);
}

/**
 * Appends the code point to the string.
 * The code point must be a scalar value; otherwise the behavior is undefined.
 * See https://www.unicode.org/glossary/#unicode_scalar_value
 *
 * @tparam StringClass A version of std::basic_string (or a compatible type)
 * @param s The string to append to
 * @param c The code point to append (must be a scalar value)
 * @return s
 * @draft ICU 78
 * @see U_IS_SCALAR_VALUE
 */
template<typename StringClass>
inline StringClass &appendUnsafe(StringClass &s, UChar32 c) {
    return prv::appendCodePoint<StringClass, false>(s, c);
}

/**
 * Returns the code point as a string of code units.
 * Returns the U+FFFD replacement character instead if c is not a scalar value.
 * See https://www.unicode.org/glossary/#unicode_scalar_value
 *
 * @tparam StringClass A version of std::basic_string (or a compatible type)
 * @param c The code point
 * @return the string of c's code units
 * @draft ICU 78
 * @see U_IS_SCALAR_VALUE
 */
template<typename StringClass>
inline StringClass encodeOrFFFD(UChar32 c) {
    StringClass s;
    prv::appendCodePoint<StringClass, true>(s, c);
    return s;
}

/**
 * Returns the code point as a string of code units.
 * The code point must be a scalar value; otherwise the behavior is undefined.
 * See https://www.unicode.org/glossary/#unicode_scalar_value
 *
 * @tparam StringClass A version of std::basic_string (or a compatible type)
 * @param c The code point
 * @return the string of c's code units
 * @draft ICU 78
 * @see U_IS_SCALAR_VALUE
 */
template<typename StringClass>
inline StringClass encodeUnsafe(UChar32 c) {
    StringClass s;
    prv::appendCodePoint<StringClass, false>(s, c);
    return s;
}
#endif  // U_HIDE_DRAFT_API

}  // namespace utfstring
}  // namespace U_HEADER_ONLY_NAMESPACE

#endif  // U_HIDE_DRAFT_API
#endif  // U_SHOW_CPLUSPLUS_API || U_SHOW_CPLUSPLUS_HEADER_API
#endif  // __UTFSTRING_H__

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