GOLDEN HOUR

DIR: /usr/include/unicode

Name	Size	Action
alphaindex.h	26.48 KB
appendable.h	8.49 KB
basictz.h	9.27 KB
brkiter.h	27.8 KB
bytestream.h	10.78 KB
bytestrie.h	20.77 KB
bytestriebuilder.h	7.08 KB
calendar.h	105.74 KB
caniter.h	7.43 KB
casemap.h	25.33 KB
char16ptr.h	7.22 KB
chariter.h	24.05 KB
choicfmt.h	23.91 KB
coleitr.h	13.76 KB
coll.h	56.23 KB
compactdecimalformat.h	6.88 KB
curramt.h	3.76 KB
currpinf.h	7.3 KB
currunit.h	4 KB
datefmt.h	40.67 KB
dbbi.h	1.19 KB
dcfmtsym.h	20.41 KB
decimfmt.h	87.19 KB
docmain.h	6.97 KB
dtfmtsym.h	37.7 KB
dtintrv.h	3.84 KB
dtitvfmt.h	46.52 KB
dtitvinf.h	18.62 KB
dtptngen.h	25.8 KB
dtrule.h	8.68 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	24.42 KB
format.h	12.5 KB
formattedvalue.h	9.75 KB
fpositer.h	3.04 KB
gender.h	3.33 KB
gregocal.h	31.71 KB
icudataver.h	1.03 KB
icuplug.h	11.88 KB
idna.h	12.7 KB
listformatter.h	9.27 KB
localebuilder.h	11.23 KB
localematcher.h	24.56 KB
localpointer.h	19.36 KB
locdspnm.h	7.12 KB
locid.h	47.68 KB
measfmt.h	11.33 KB
measunit.h	95.28 KB
measure.h	4.32 KB
messagepattern.h	33.71 KB
msgfmt.h	44.11 KB
normalizer2.h	34.03 KB
normlzr.h	30.94 KB
nounit.h	2.69 KB
numberformatter.h	84.25 KB
numberrangeformatter.h	27.95 KB
numfmt.h	49.76 KB
numsys.h	7.32 KB
parseerr.h	3.08 KB
parsepos.h	5.56 KB
platform.h	28.08 KB
plurfmt.h	25.2 KB
plurrule.h	18.34 KB
ptypes.h	3.49 KB
putil.h	6.33 KB
rbbi.h	26.58 KB
rbnf.h	48.73 KB
rbtz.h	15.6 KB
regex.h	84.34 KB
region.h	9.18 KB
reldatefmt.h	22.27 KB
rep.h	9.37 KB
resbund.h	18.07 KB
schriter.h	6.32 KB
scientificnumberformatter.h	6.4 KB
search.h	22.22 KB
selfmt.h	14.3 KB
simpleformatter.h	12.59 KB
simpletz.h	45.44 KB
smpdtfmt.h	71.01 KB
sortkey.h	11.18 KB
std_string.h	1.05 KB
strenum.h	9.92 KB
stringoptions.h	5.79 KB
stringpiece.h	10.35 KB
stringtriebuilder.h	15.33 KB
stsearch.h	21.3 KB
symtable.h	4.27 KB
tblcoll.h	36.61 KB
timezone.h	41.02 KB
tmunit.h	3.38 KB
tmutamt.h	4.9 KB
tmutfmt.h	7.85 KB
translit.h	65.82 KB
tzfmt.h	42.89 KB
tznames.h	16.85 KB
tzrule.h	35.37 KB
tztrans.h	6.12 KB
ubidi.h	89.56 KB
ubiditransform.h	12.65 KB
ubrk.h	23.97 KB
ucal.h	56.9 KB
ucasemap.h	15.18 KB
ucat.h	5.36 KB
uchar.h	141.24 KB
ucharstrie.h	22.58 KB
ucharstriebuilder.h	7.21 KB
uchriter.h	13.2 KB
uclean.h	11.21 KB
ucnv.h	83.09 KB
ucnv_cb.h	6.59 KB
ucnv_err.h	20.99 KB
ucnvsel.h	6.14 KB
ucol.h	61.46 KB
ucoleitr.h	9.46 KB
uconfig.h	12.07 KB
ucpmap.h	5.53 KB
ucptrie.h	22.46 KB
ucsdet.h	14.67 KB
ucurr.h	16.12 KB
udat.h	61.38 KB
udata.h	15.56 KB
udateintervalformat.h	10.74 KB
udatpg.h	26.8 KB
udisplaycontext.h	5.89 KB
uenum.h	7.78 KB
ufieldpositer.h	4.36 KB
uformattable.h	10.94 KB
uformattedvalue.h	12.12 KB
ugender.h	2 KB
uidna.h	33.37 KB
uiter.h	22.77 KB
uldnames.h	10.45 KB
ulistformatter.h	10.83 KB
uloc.h	53.16 KB
ulocdata.h	11.26 KB
umachine.h	14.54 KB
umisc.h	1.33 KB
umsg.h	24.23 KB
umutablecptrie.h	8.24 KB
unifilt.h	3.96 KB
unifunct.h	4.04 KB
unimatch.h	6.1 KB
unirepl.h	3.38 KB
uniset.h	64.9 KB
unistr.h	170.43 KB
unorm.h	20.52 KB
unorm2.h	24.66 KB
unum.h	53.46 KB
unumberformatter.h	25.22 KB
unumsys.h	7.21 KB
uobject.h	10.68 KB
upluralrules.h	7.83 KB
uregex.h	72.05 KB
uregion.h	9.84 KB
ureldatefmt.h	17 KB
urename.h	131.3 KB
urep.h	5.38 KB
ures.h	36.54 KB
uscript.h	27.21 KB
usearch.h	38.12 KB
uset.h	40 KB
usetiter.h	9.55 KB
ushape.h	18 KB
uspoof.h	65.9 KB
usprep.h	8.14 KB
ustdio.h	38.54 KB
ustream.h	1.89 KB
ustring.h	72.47 KB
ustringtrie.h	3.15 KB
utext.h	58.13 KB
utf.h	7.86 KB
utf16.h	23.32 KB
utf32.h	763 B
utf8.h	30.96 KB
utf_old.h	45.83 KB
utmscale.h	13.78 KB
utrace.h	17.29 KB
utrans.h	25.52 KB
utypes.h	30.74 KB
uvernum.h	6.67 KB
uversion.h	6 KB
vtzone.h	20.3 KB

Edit: casemap.h

// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

// casemap.h
// created: 2017jan12 Markus W. Scherer

#ifndef __CASEMAP_H__
#define __CASEMAP_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/stringpiece.h"
#include "unicode/uobject.h"

/**
 * \file
 * \brief C++ API: Low-level C++ case mapping functions.
 */

U_NAMESPACE_BEGIN

class BreakIterator;
class ByteSink;
class Edits;

/**
 * Low-level C++ case mapping functions.
 *
 * @stable ICU 59
 */
class U_COMMON_API CaseMap U_FINAL : public UMemory {
public:
    /**
     * Lowercases a UTF-16 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of char16_ts). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see u_strToLower
     * @stable ICU 59
     */
     static int32_t toLower(
            const char *locale, uint32_t options,
            const char16_t *src, int32_t srcLength,
            char16_t *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

/**
     * Uppercases a UTF-16 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of char16_ts). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see u_strToUpper
     * @stable ICU 59
     */
    static int32_t toUpper(
            const char *locale, uint32_t options,
            const char16_t *src, int32_t srcLength,
            char16_t *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

#if !UCONFIG_NO_BREAK_ITERATION

/**
     * Titlecases a UTF-16 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * Titlecasing uses a break iterator to find the first characters of words
     * that are to be titlecased. It titlecases those characters and lowercases
     * all others. (This can be modified with options bits.)
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT, U_EDITS_NO_RESET,
     *                  U_TITLECASE_NO_LOWERCASE,
     *                  U_TITLECASE_NO_BREAK_ADJUSTMENT, U_TITLECASE_ADJUST_TO_CASED,
     *                  U_TITLECASE_WHOLE_STRING, U_TITLECASE_SENTENCES.
     * @param iter      A break iterator to find the first characters of words that are to be titlecased.
     *                  It is set to the source string (setText())
     *                  and used one or more times for iteration (first() and next()).
     *                  If NULL, then a word break iterator for the locale is used
     *                  (or something equivalent).
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of char16_ts). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see u_strToTitle
     * @see ucasemap_toTitle
     * @stable ICU 59
     */
    static int32_t toTitle(
            const char *locale, uint32_t options, BreakIterator *iter,
            const char16_t *src, int32_t srcLength,
            char16_t *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

#endif  // UCONFIG_NO_BREAK_ITERATION

/**
     * Case-folds a UTF-16 string and optionally records edits.
     *
     * Case folding is locale-independent and not context-sensitive,
     * but there is an option for whether to include or exclude mappings for dotted I
     * and dotless i that are marked with 'T' in CaseFolding.txt.
     *
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT, U_EDITS_NO_RESET,
     *                  U_FOLD_CASE_DEFAULT, U_FOLD_CASE_EXCLUDE_SPECIAL_I.
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of char16_ts). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see u_strFoldCase
     * @stable ICU 59
     */
    static int32_t fold(
            uint32_t options,
            const char16_t *src, int32_t srcLength,
            char16_t *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

/**
     * Lowercases a UTF-8 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
     * @param src       The original string.
     * @param sink      A ByteSink to which the result string is written.
     *                  sink.Flush() is called at the end.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     *
     * @see ucasemap_utf8ToLower
     * @stable ICU 60
     */
    static void utf8ToLower(
            const char *locale, uint32_t options,
            StringPiece src, ByteSink &sink, Edits *edits,
            UErrorCode &errorCode);

/**
     * Uppercases a UTF-8 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
     * @param src       The original string.
     * @param sink      A ByteSink to which the result string is written.
     *                  sink.Flush() is called at the end.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     *
     * @see ucasemap_utf8ToUpper
     * @stable ICU 60
     */
    static void utf8ToUpper(
            const char *locale, uint32_t options,
            StringPiece src, ByteSink &sink, Edits *edits,
            UErrorCode &errorCode);

#if !UCONFIG_NO_BREAK_ITERATION

/**
     * Titlecases a UTF-8 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     *
     * Titlecasing uses a break iterator to find the first characters of words
     * that are to be titlecased. It titlecases those characters and lowercases
     * all others. (This can be modified with options bits.)
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT, U_EDITS_NO_RESET,
     *                  U_TITLECASE_NO_LOWERCASE,
     *                  U_TITLECASE_NO_BREAK_ADJUSTMENT, U_TITLECASE_ADJUST_TO_CASED,
     *                  U_TITLECASE_WHOLE_STRING, U_TITLECASE_SENTENCES.
     * @param iter      A break iterator to find the first characters of words that are to be titlecased.
     *                  It is set to the source string (setUText())
     *                  and used one or more times for iteration (first() and next()).
     *                  If NULL, then a word break iterator for the locale is used
     *                  (or something equivalent).
     * @param src       The original string.
     * @param sink      A ByteSink to which the result string is written.
     *                  sink.Flush() is called at the end.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     *
     * @see ucasemap_utf8ToTitle
     * @stable ICU 60
     */
    static void utf8ToTitle(
            const char *locale, uint32_t options, BreakIterator *iter,
            StringPiece src, ByteSink &sink, Edits *edits,
            UErrorCode &errorCode);

#endif  // UCONFIG_NO_BREAK_ITERATION

/**
     * Lowercases a UTF-8 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see ucasemap_utf8ToLower
     * @stable ICU 59
     */
    static int32_t utf8ToLower(
            const char *locale, uint32_t options,
            const char *src, int32_t srcLength,
            char *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

/**
     * Uppercases a UTF-8 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see ucasemap_utf8ToUpper
     * @stable ICU 59
     */
    static int32_t utf8ToUpper(
            const char *locale, uint32_t options,
            const char *src, int32_t srcLength,
            char *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

#if !UCONFIG_NO_BREAK_ITERATION

/**
     * Titlecases a UTF-8 string and optionally records edits.
     * Casing is locale-dependent and context-sensitive.
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * Titlecasing uses a break iterator to find the first characters of words
     * that are to be titlecased. It titlecases those characters and lowercases
     * all others. (This can be modified with options bits.)
     *
     * @param locale    The locale ID. ("" = root locale, NULL = default locale.)
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT, U_EDITS_NO_RESET,
     *                  U_TITLECASE_NO_LOWERCASE,
     *                  U_TITLECASE_NO_BREAK_ADJUSTMENT, U_TITLECASE_ADJUST_TO_CASED,
     *                  U_TITLECASE_WHOLE_STRING, U_TITLECASE_SENTENCES.
     * @param iter      A break iterator to find the first characters of words that are to be titlecased.
     *                  It is set to the source string (setUText())
     *                  and used one or more times for iteration (first() and next()).
     *                  If NULL, then a word break iterator for the locale is used
     *                  (or something equivalent).
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see ucasemap_utf8ToTitle
     * @stable ICU 59
     */
    static int32_t utf8ToTitle(
            const char *locale, uint32_t options, BreakIterator *iter,
            const char *src, int32_t srcLength,
            char *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

#endif  // UCONFIG_NO_BREAK_ITERATION

/**
     * Case-folds a UTF-8 string and optionally records edits.
     *
     * Case folding is locale-independent and not context-sensitive,
     * but there is an option for whether to include or exclude mappings for dotted I
     * and dotless i that are marked with 'T' in CaseFolding.txt.
     *
     * The result may be longer or shorter than the original.
     * The source string and the destination buffer must not overlap.
     *
     * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT, U_EDITS_NO_RESET,
     *                  U_FOLD_CASE_DEFAULT, U_FOLD_CASE_EXCLUDE_SPECIAL_I.
     * @param src       The original string.
     * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
     * @param dest      A buffer for the result string. The result will be NUL-terminated if
     *                  the buffer is large enough.
     *                  The contents is undefined in case of failure.
     * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
     *                  dest may be NULL and the function will only return the length of the result
     *                  without writing any of the result string.
     * @param edits     Records edits for index mapping, working with styled text,
     *                  and getting only changes (if any).
     *                  The Edits contents is undefined if any error occurs.
     *                  This function calls edits->reset() first unless
     *                  options includes U_EDITS_NO_RESET. edits can be NULL.
     * @param errorCode Reference to an in/out error code value
     *                  which must not indicate a failure before the function call.
     * @return The length of the result string, if successful.
     *         When the result would be longer than destCapacity,
     *         the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
     *
     * @see ucasemap_utf8FoldCase
     * @stable ICU 59
     */
    static int32_t utf8Fold(
            uint32_t options,
            const char *src, int32_t srcLength,
            char *dest, int32_t destCapacity, Edits *edits,
            UErrorCode &errorCode);

private:
    CaseMap() = delete;
    CaseMap(const CaseMap &other) = delete;
    CaseMap &operator=(const CaseMap &other) = delete;
};

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __CASEMAP_H__

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Edit: casemap.h

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