FM / unicode

/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27118	0644	edit dl rm
appendable.h	8694	0644	edit dl rm
basictz.h	9491	0644	edit dl rm
brkiter.h	28464	0644	edit dl rm
bytestream.h	11037	0644	edit dl rm
bytestrie.h	21266	0644	edit dl rm
bytestriebuilder.h	7248	0644	edit dl rm
calendar.h	108278	0644	edit dl rm
caniter.h	7611	0644	edit dl rm
casemap.h	25933	0644	edit dl rm
char16ptr.h	7393	0644	edit dl rm
chariter.h	24632	0644	edit dl rm
choicfmt.h	24482	0644	edit dl rm
coleitr.h	14094	0644	edit dl rm
coll.h	57581	0644	edit dl rm
compactdecimalformat.h	7047	0644	edit dl rm
curramt.h	3851	0644	edit dl rm
currpinf.h	7473	0644	edit dl rm
currunit.h	4094	0644	edit dl rm
datefmt.h	41641	0644	edit dl rm
dbbi.h	1223	0644	edit dl rm
dcfmtsym.h	20897	0644	edit dl rm
decimfmt.h	89278	0644	edit dl rm
docmain.h	7142	0644	edit dl rm
dtfmtsym.h	38609	0644	edit dl rm
dtintrv.h	3930	0644	edit dl rm
dtitvfmt.h	47634	0644	edit dl rm
dtitvinf.h	19064	0644	edit dl rm
dtptngen.h	26419	0644	edit dl rm
dtrule.h	8888	0644	edit dl rm
edits.h	21237	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4956	0644	edit dl rm
fieldpos.h	8899	0644	edit dl rm
filteredbrk.h	5501	0644	edit dl rm
fmtable.h	25007	0644	edit dl rm
format.h	12802	0644	edit dl rm
formattedvalue.h	9987	0644	edit dl rm
fpositer.h	3109	0644	edit dl rm
gender.h	3408	0644	edit dl rm
gregocal.h	32472	0644	edit dl rm
icudataver.h	1051	0644	edit dl rm
icuplug.h	12166	0644	edit dl rm
idna.h	13000	0644	edit dl rm
listformatter.h	9493	0644	edit dl rm
localebuilder.h	11502	0644	edit dl rm
localematcher.h	25147	0644	edit dl rm
localpointer.h	19829	0644	edit dl rm
locdspnm.h	7292	0644	edit dl rm
locid.h	48821	0644	edit dl rm
measfmt.h	11603	0644	edit dl rm
measunit.h	97563	0644	edit dl rm
measure.h	4423	0644	edit dl rm
messagepattern.h	34521	0644	edit dl rm
msgfmt.h	45168	0644	edit dl rm
normalizer2.h	34851	0644	edit dl rm
normlzr.h	31682	0644	edit dl rm
nounit.h	2754	0644	edit dl rm
numberformatter.h	86276	0644	edit dl rm
numberrangeformatter.h	28617	0644	edit dl rm
numfmt.h	50950	0644	edit dl rm
numsys.h	7500	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5692	0644	edit dl rm
platform.h	28751	0644	edit dl rm
plurfmt.h	25800	0644	edit dl rm
plurrule.h	18780	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6487	0644	edit dl rm
rbbi.h	27218	0644	edit dl rm
rbnf.h	49899	0644	edit dl rm
rbtz.h	15979	0644	edit dl rm
regex.h	86367	0644	edit dl rm
region.h	9404	0644	edit dl rm
reldatefmt.h	22801	0644	edit dl rm
rep.h	9599	0644	edit dl rm
resbund.h	18503	0644	edit dl rm
schriter.h	6475	0644	edit dl rm
scientificnumberformatter.h	6553	0644	edit dl rm
search.h	22757	0644	edit dl rm
selfmt.h	14643	0644	edit dl rm
simpleformatter.h	12888	0644	edit dl rm
simpletz.h	46527	0644	edit dl rm
smpdtfmt.h	72713	0644	edit dl rm
sortkey.h	11444	0644	edit dl rm
std_string.h	1076	0644	edit dl rm
strenum.h	10158	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	10597	0644	edit dl rm
stringtriebuilder.h	15698	0644	edit dl rm
stsearch.h	21810	0644	edit dl rm
symtable.h	4374	0644	edit dl rm
tblcoll.h	37489	0644	edit dl rm
timezone.h	42005	0644	edit dl rm
tmunit.h	3461	0644	edit dl rm
tmutamt.h	5015	0644	edit dl rm
tmutfmt.h	8042	0644	edit dl rm
translit.h	67400	0644	edit dl rm
tzfmt.h	43916	0644	edit dl rm
tznames.h	17252	0644	edit dl rm
tzrule.h	36215	0644	edit dl rm
tztrans.h	6271	0644	edit dl rm
ubidi.h	91711	0644	edit dl rm
ubiditransform.h	12950	0644	edit dl rm
ubrk.h	24547	0644	edit dl rm
ucal.h	58265	0644	edit dl rm
ucasemap.h	15546	0644	edit dl rm
ucat.h	5484	0644	edit dl rm
uchar.h	144630	0644	edit dl rm
ucharstrie.h	23120	0644	edit dl rm
ucharstriebuilder.h	7378	0644	edit dl rm
uchriter.h	13521	0644	edit dl rm
uclean.h	11474	0644	edit dl rm
ucnv.h	85085	0644	edit dl rm
ucnvsel.h	6283	0644	edit dl rm
ucnv_cb.h	6748	0644	edit dl rm
ucnv_err.h	21492	0644	edit dl rm
ucol.h	62939	0644	edit dl rm
ucoleitr.h	9684	0644	edit dl rm
uconfig.h	12356	0644	edit dl rm
ucpmap.h	5663	0644	edit dl rm
ucptrie.h	23002	0644	edit dl rm
ucsdet.h	15018	0644	edit dl rm
ucurr.h	16507	0644	edit dl rm
udat.h	62851	0644	edit dl rm
udata.h	15930	0644	edit dl rm
udateintervalformat.h	10995	0644	edit dl rm
udatpg.h	27447	0644	edit dl rm
udisplaycontext.h	6029	0644	edit dl rm
uenum.h	7970	0644	edit dl rm
ufieldpositer.h	4461	0644	edit dl rm
uformattable.h	11198	0644	edit dl rm
uformattedvalue.h	12413	0644	edit dl rm
ugender.h	2052	0644	edit dl rm
uidna.h	34169	0644	edit dl rm
uiter.h	23319	0644	edit dl rm
uldnames.h	10702	0644	edit dl rm
ulistformatter.h	11086	0644	edit dl rm
uloc.h	54432	0644	edit dl rm
ulocdata.h	11533	0644	edit dl rm
umachine.h	14884	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24812	0644	edit dl rm
umutablecptrie.h	8435	0644	edit dl rm
unifilt.h	4055	0644	edit dl rm
unifunct.h	4141	0644	edit dl rm
unimatch.h	6244	0644	edit dl rm
unirepl.h	3464	0644	edit dl rm
uniset.h	66459	0644	edit dl rm
unistr.h	174523	0644	edit dl rm
unorm.h	21015	0644	edit dl rm
unorm2.h	25254	0644	edit dl rm
unum.h	54743	0644	edit dl rm
unumberformatter.h	25824	0644	edit dl rm
unumsys.h	7387	0644	edit dl rm
uobject.h	10936	0644	edit dl rm
upluralrules.h	8013	0644	edit dl rm
uregex.h	73784	0644	edit dl rm
uregion.h	10073	0644	edit dl rm
ureldatefmt.h	17409	0644	edit dl rm
urename.h	134449	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37415	0644	edit dl rm
uscript.h	27867	0644	edit dl rm
usearch.h	39039	0644	edit dl rm
uset.h	40958	0644	edit dl rm
usetiter.h	9781	0644	edit dl rm
ushape.h	18432	0644	edit dl rm
uspoof.h	67480	0644	edit dl rm
usprep.h	8331	0644	edit dl rm
ustdio.h	39469	0644	edit dl rm
ustream.h	1934	0644	edit dl rm
ustring.h	74211	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59527	0644	edit dl rm
utf.h	8046	0644	edit dl rm
utf8.h	31700	0644	edit dl rm
utf16.h	23878	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	46929	0644	edit dl rm
utmscale.h	14113	0644	edit dl rm
utrace.h	17706	0644	edit dl rm
utrans.h	26130	0644	edit dl rm
utypes.h	31481	0644	edit dl rm
uvernum.h	6832	0644	edit dl rm
uversion.h	6145	0644	edit dl rm
vtzone.h	20784	0644	edit dl rm

Edit: /usr/include/unicode/localematcher.h (25147B)

// © 2019 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License

// localematcher.h
// created: 2019may08 Markus W. Scherer

#ifndef __LOCALEMATCHER_H__
#define __LOCALEMATCHER_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

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

/**
 * \file
 * \brief C++ API: Locale matcher: User's desired locales vs. application's supported locales.
 */

#ifndef U_FORCE_HIDE_DRAFT_API

/**
 * Builder option for whether the language subtag or the script subtag is most important.
 *
 * @see Builder#setFavorSubtag(ULocMatchFavorSubtag)
 * @draft ICU 65
 */
enum ULocMatchFavorSubtag {
    /**
     * Language differences are most important, then script differences, then region differences.
     * (This is the default behavior.)
     *
     * @draft ICU 65
     */
    ULOCMATCH_FAVOR_LANGUAGE,
    /**
     * Makes script differences matter relatively more than language differences.
     *
     * @draft ICU 65
     */
    ULOCMATCH_FAVOR_SCRIPT
};
#ifndef U_IN_DOXYGEN
typedef enum ULocMatchFavorSubtag ULocMatchFavorSubtag;
#endif

/**
 * Builder option for whether all desired locales are treated equally or
 * earlier ones are preferred.
 *
 * @see Builder#setDemotionPerDesiredLocale(ULocMatchDemotion)
 * @draft ICU 65
 */
enum ULocMatchDemotion {
 /**
 * All desired locales are treated equally.
 *
 * @draft ICU 65
 */
 ULOCMATCH_DEMOTION_NONE,
 /**
 * Earlier desired locales are preferred.
 *
 * From each desired locale to the next,
 * the distance to any supported locale is increased by an additional amount
 * which is at least as large as most region mismatches.
 * A later desired locale has to have a better match with some supported locale
 * due to more than merely having the same region subtag.
 *
 * For example: <code>Supported={en, sv} desired=[en-GB, sv]</code>
 * yields <code>Result(en-GB, en)</code> because
 * with the demotion of sv its perfect match is no better than
 * the region distance between the earlier desired locale en-GB and en=en-US.
 *
 * Notes:
 * <ul>
 * <li>In some cases, language and/or script differences can be as small as
 * the typical region difference. (Example: sr-Latn vs. sr-Cyrl)
 * <li>It is possible for certain region differences to be larger than usual,
 * and larger than the demotion.
 * (As of CLDR 35 there is no such case, but
 * this is possible in future versions of the data.)
 * </ul>
 *
 * @draft ICU 65
 */
 ULOCMATCH_DEMOTION_REGION
};
#ifndef U_IN_DOXYGEN
typedef enum ULocMatchDemotion ULocMatchDemotion;
#endif

/**
 * Builder option for whether to include or ignore one-way (fallback) match data.
 * The LocaleMatcher uses CLDR languageMatch data which includes fallback (oneway=true) entries.
 * Sometimes it is desirable to ignore those.
 *
 * For example, consider a web application with the UI in a given language,
 * with a link to another, related web app.
 * The link should include the UI language, and the target server may also use
 * the client’s Accept-Language header data.
 * The target server has its own list of supported languages.
 * One may want to favor UI language consistency, that is,
 * if there is a decent match for the original UI language, we want to use it,
 * but not if it is merely a fallback.
 *
 * @see Builder#setDirection(ULocMatchDirection)
 * @draft ICU 67
 */
enum ULocMatchDirection {
 /**
 * Locale matching includes one-way matches such as Breton→French. (default)
 *
 * @draft ICU 67
 */
 ULOCMATCH_DIRECTION_WITH_ONE_WAY,
 /**
 * Locale matching limited to two-way matches including e.g. Danish↔Norwegian
 * but ignoring one-way matches.
 *
 * @draft ICU 67
 */
 ULOCMATCH_DIRECTION_ONLY_TWO_WAY
};
#ifndef U_IN_DOXYGEN
typedef enum ULocMatchDirection ULocMatchDirection;
#endif

struct UHashtable;

U_NAMESPACE_BEGIN

struct LSR;

class LocaleDistance;
class LocaleLsrIterator;
class UVector;
class XLikelySubtags;

/**
 * Immutable class that picks the best match between a user's desired locales and
 * an application's supported locales.
 * Movable but not copyable.
 *
 * Example:
 * <pre>
 * UErrorCode errorCode = U_ZERO_ERROR;
 * LocaleMatcher matcher = LocaleMatcher::Builder().setSupportedLocales("fr, en-GB, en").build(errorCode);
 * Locale *bestSupported = matcher.getBestLocale(Locale.US, errorCode); // "en"
 * </pre>
 *
 * A matcher takes into account when languages are close to one another,
 * such as Danish and Norwegian,
 * and when regional variants are close, like en-GB and en-AU as opposed to en-US.
 *
 * If there are multiple supported locales with the same (language, script, region)
 * likely subtags, then the current implementation returns the first of those locales.
 * It ignores variant subtags (except for pseudolocale variants) and extensions.
 * This may change in future versions.
 *
 * For example, the current implementation does not distinguish between
 * de, de-DE, de-Latn, de-1901, de-u-co-phonebk.
 *
 * If you prefer one equivalent locale over another, then provide only the preferred one,
 * or place it earlier in the list of supported locales.
 *
 * Otherwise, the order of supported locales may have no effect on the best-match results.
 * The current implementation compares each desired locale with supported locales
 * in the following order:
 * 1. Default locale, if supported;
 * 2. CLDR "paradigm locales" like en-GB and es-419;
 * 3. other supported locales.
 * This may change in future versions.
 *
 * Often a product will just need one matcher instance, built with the languages
 * that it supports. However, it may want multiple instances with different
 * default languages based on additional information, such as the domain.
 *
 * This class is not intended for public subclassing.
 *
 * @draft ICU 65
 */
class U_COMMON_API LocaleMatcher : public UMemory {
public:
 /**
 * Data for the best-matching pair of a desired and a supported locale.
 * Movable but not copyable.
 *
 * @draft ICU 65
 */
 class U_COMMON_API Result : public UMemory {
 public:
 /**
 * Move constructor; might modify the source.
 * This object will have the same contents that the source object had.
 *
 * @param src Result to move contents from.
 * @draft ICU 65
 */
 Result(Result &&src) U_NOEXCEPT;

/**
         * Destructor.
         *
         * @draft ICU 65
         */
        ~Result();

/**
         * Move assignment; might modify the source.
         * This object will have the same contents that the source object had.
         *
         * @param src Result to move contents from.
         * @draft ICU 65
         */
        Result &operator=(Result &&src) U_NOEXCEPT;

#ifndef U_HIDE_DRAFT_API
        /**
         * Returns the best-matching desired locale.
         * nullptr if the list of desired locales is empty or if none matched well enough.
         *
         * @return the best-matching desired locale, or nullptr.
         * @draft ICU 65
         */
        inline const Locale *getDesiredLocale() const { return desiredLocale; }

/**
         * Returns the best-matching supported locale.
         * If none matched well enough, this is the default locale.
         * The default locale is nullptr if the list of supported locales is empty and
         * no explicit default locale is set.
         *
         * @return the best-matching supported locale, or nullptr.
         * @draft ICU 65
         */
        inline const Locale *getSupportedLocale() const { return supportedLocale; }

/**
         * Returns the index of the best-matching desired locale in the input Iterable order.
         * -1 if the list of desired locales is empty or if none matched well enough.
         *
         * @return the index of the best-matching desired locale, or -1.
         * @draft ICU 65
         */
        inline int32_t getDesiredIndex() const { return desiredIndex; }

/**
         * Returns the index of the best-matching supported locale in the
         * constructor’s or builder’s input order (“set” Collection plus “added” locales).
         * If the matcher was built from a locale list string, then the iteration order is that
         * of a LocalePriorityList built from the same string.
         * -1 if the list of supported locales is empty or if none matched well enough.
         *
         * @return the index of the best-matching supported locale, or -1.
         * @draft ICU 65
         */
        inline int32_t getSupportedIndex() const { return supportedIndex; }

/**
 * Takes the best-matching supported locale and adds relevant fields of the
 * best-matching desired locale, such as the -t- and -u- extensions.
 * May replace some fields of the supported locale.
 * The result is the locale that should be used for date and number formatting, collation, etc.
 * Returns the root locale if getSupportedLocale() returns nullptr.
 *
 * Example: desired=ar-SA-u-nu-latn, supported=ar-EG, resolved locale=ar-SA-u-nu-latn
 *
 * @return a locale combining the best-matching desired and supported locales.
 * @draft ICU 65
 */
 Locale makeResolvedLocale(UErrorCode &errorCode) const;
#endif // U_HIDE_DRAFT_API

private:
        Result(const Locale *desired, const Locale *supported,
               int32_t desIndex, int32_t suppIndex, UBool owned) :
                desiredLocale(desired), supportedLocale(supported),
                desiredIndex(desIndex), supportedIndex(suppIndex),
                desiredIsOwned(owned) {}

Result(const Result &other) = delete;
        Result &operator=(const Result &other) = delete;

const Locale *desiredLocale;
        const Locale *supportedLocale;
        int32_t desiredIndex;
        int32_t supportedIndex;
        UBool desiredIsOwned;

friend class LocaleMatcher;
    };

/**
     * LocaleMatcher builder.
     * Movable but not copyable.
     *
     * @see LocaleMatcher#builder()
     * @draft ICU 65
     */
    class U_COMMON_API Builder : public UMemory {
    public:
        /**
         * Constructs a builder used in chaining parameters for building a LocaleMatcher.
         *
         * @return a new Builder object
         * @draft ICU 65
         */
        Builder() {}

/**
         * Move constructor; might modify the source.
         * This builder will have the same contents that the source builder had.
         *
         * @param src Builder to move contents from.
         * @draft ICU 65
         */
        Builder(Builder &&src) U_NOEXCEPT;

/**
         * Destructor.
         *
         * @draft ICU 65
         */
        ~Builder();

/**
         * Move assignment; might modify the source.
         * This builder will have the same contents that the source builder had.
         *
         * @param src Builder to move contents from.
         * @draft ICU 65
         */
        Builder &operator=(Builder &&src) U_NOEXCEPT;

#ifndef U_HIDE_DRAFT_API
 /**
 * Parses an Accept-Language string
 * (<a href="https://tools.ietf.org/html/rfc2616#section-14.4">RFC 2616 Section 14.4</a>),
 * such as "af, en, fr;q=0.9", and sets the supported locales accordingly.
 * Allows whitespace in more places but does not allow "*".
 * Clears any previously set/added supported locales first.
 *
 * @param locales the Accept-Language string of locales to set
 * @return this Builder object
 * @draft ICU 65
 */
 Builder &setSupportedLocalesFromListString(StringPiece locales);

/**
         * Copies the supported locales, preserving iteration order.
         * Clears any previously set/added supported locales first.
         * Duplicates are allowed, and are not removed.
         *
         * @param locales the list of locale
         * @return this Builder object
         * @draft ICU 65
         */
        Builder &setSupportedLocales(Locale::Iterator &locales);

/**
 * Copies the supported locales from the begin/end range, preserving iteration order.
 * Clears any previously set/added supported locales first.
 * Duplicates are allowed, and are not removed.
 *
 * Each of the iterator parameter values must be an
 * input iterator whose value is convertible to const Locale &.
 *
 * @param begin Start of range.
 * @param end Exclusive end of range.
 * @return this Builder object
 * @draft ICU 65
 */
 template<typename Iter>
 Builder &setSupportedLocales(Iter begin, Iter end) {
 if (U_FAILURE(errorCode_)) { return *this; }
 clearSupportedLocales();
 while (begin != end) {
 addSupportedLocale(*begin++);
 }
 return *this;
 }

/**
 * Copies the supported locales from the begin/end range, preserving iteration order.
 * Calls the converter to convert each *begin to a Locale or const Locale &.
 * Clears any previously set/added supported locales first.
 * Duplicates are allowed, and are not removed.
 *
 * Each of the iterator parameter values must be an
 * input iterator whose value is convertible to const Locale &.
 *
 * @param begin Start of range.
 * @param end Exclusive end of range.
 * @param converter Converter from *begin to const Locale & or compatible.
 * @return this Builder object
 * @draft ICU 65
 */
 template<typename Iter, typename Conv>
 Builder &setSupportedLocalesViaConverter(Iter begin, Iter end, Conv converter) {
 if (U_FAILURE(errorCode_)) { return *this; }
 clearSupportedLocales();
 while (begin != end) {
 addSupportedLocale(converter(*begin++));
 }
 return *this;
 }

/**
         * Adds another supported locale.
         * Duplicates are allowed, and are not removed.
         *
         * @param locale another locale
         * @return this Builder object
         * @draft ICU 65
         */
        Builder &addSupportedLocale(const Locale &locale);

/**
         * Sets the default locale; if nullptr, or if it is not set explicitly,
         * then the first supported locale is used as the default locale.
         *
         * @param defaultLocale the default locale (will be copied)
         * @return this Builder object
         * @draft ICU 65
         */
        Builder &setDefaultLocale(const Locale *defaultLocale);

/**
         * If ULOCMATCH_FAVOR_SCRIPT, then the language differences are smaller than script
         * differences.
         * This is used in situations (such as maps) where
         * it is better to fall back to the same script than a similar language.
         *
         * @param subtag the subtag to favor
         * @return this Builder object
         * @draft ICU 65
         */
        Builder &setFavorSubtag(ULocMatchFavorSubtag subtag);

/**
         * Option for whether all desired locales are treated equally or
         * earlier ones are preferred (this is the default).
         *
         * @param demotion the demotion per desired locale to set.
         * @return this Builder object
         * @draft ICU 65
         */
        Builder &setDemotionPerDesiredLocale(ULocMatchDemotion demotion);

/**
         * Option for whether to include or ignore one-way (fallback) match data.
         * By default, they are included.
         *
         * @param direction the match direction to set.
         * @return this Builder object
         * @draft ICU 67
         */
        Builder &setDirection(ULocMatchDirection direction) {
            if (U_SUCCESS(errorCode_)) {
                direction_ = direction;
            }
            return *this;
        }

/**
         * Sets the UErrorCode if an error occurred while setting parameters.
         * Preserves older error codes in the outErrorCode.
         *
         * @param outErrorCode Set to an error code if it does not contain one already
         *                  and an error occurred while setting parameters.
         *                  Otherwise unchanged.
         * @return TRUE if U_FAILURE(outErrorCode)
         * @draft ICU 65
         */
        UBool copyErrorTo(UErrorCode &outErrorCode) const;

/**
         * Builds and returns a new locale matcher.
         * This builder can continue to be used.
         *
         * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
         *                  or else the function returns immediately. Check for U_FAILURE()
         *                  on output or use with function chaining. (See User Guide for details.)
         * @return new LocaleMatcher.
         * @draft ICU 65
         */
        LocaleMatcher build(UErrorCode &errorCode) const;
#endif  // U_HIDE_DRAFT_API

private:
        friend class LocaleMatcher;

Builder(const Builder &other) = delete;
        Builder &operator=(const Builder &other) = delete;

void clearSupportedLocales();
        bool ensureSupportedLocaleVector();

UErrorCode errorCode_ = U_ZERO_ERROR;
        UVector *supportedLocales_ = nullptr;
        int32_t thresholdDistance_ = -1;
        ULocMatchDemotion demotion_ = ULOCMATCH_DEMOTION_REGION;
        Locale *defaultLocale_ = nullptr;
        ULocMatchFavorSubtag favor_ = ULOCMATCH_FAVOR_LANGUAGE;
        ULocMatchDirection direction_ = ULOCMATCH_DIRECTION_WITH_ONE_WAY;
    };

// FYI No public LocaleMatcher constructors in C++; use the Builder.

/**
     * Move copy constructor; might modify the source.
     * This matcher will have the same settings that the source matcher had.
     * @param src source matcher
     * @draft ICU 65
     */
    LocaleMatcher(LocaleMatcher &&src) U_NOEXCEPT;

/**
     * Destructor.
     * @draft ICU 65
     */
    ~LocaleMatcher();

/**
     * Move assignment operator; might modify the source.
     * This matcher will have the same settings that the source matcher had.
     * The behavior is undefined if *this and src are the same object.
     * @param src source matcher
     * @return *this
     * @draft ICU 65
     */
    LocaleMatcher &operator=(LocaleMatcher &&src) U_NOEXCEPT;

#ifndef U_HIDE_DRAFT_API
    /**
     * Returns the supported locale which best matches the desired locale.
     *
     * @param desiredLocale Typically a user's language.
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching supported locale.
     * @draft ICU 65
     */
    const Locale *getBestMatch(const Locale &desiredLocale, UErrorCode &errorCode) const;

/**
     * Returns the supported locale which best matches one of the desired locales.
     *
     * @param desiredLocales Typically a user's languages, in order of preference (descending).
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching supported locale.
     * @draft ICU 65
     */
    const Locale *getBestMatch(Locale::Iterator &desiredLocales, UErrorCode &errorCode) const;

/**
 * Parses an Accept-Language string
 * (<a href="https://tools.ietf.org/html/rfc2616#section-14.4">RFC 2616 Section 14.4</a>),
 * such as "af, en, fr;q=0.9",
 * and returns the supported locale which best matches one of the desired locales.
 * Allows whitespace in more places but does not allow "*".
 *
 * @param desiredLocaleList Typically a user's languages, as an Accept-Language string.
 * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
 * or else the function returns immediately. Check for U_FAILURE()
 * on output or use with function chaining. (See User Guide for details.)
 * @return the best-matching supported locale.
 * @draft ICU 65
 */
 const Locale *getBestMatchForListString(StringPiece desiredLocaleList, UErrorCode &errorCode) const;

/**
     * Returns the best match between the desired locale and the supported locales.
     * If the result's desired locale is not nullptr, then it is the address of the input locale.
     * It has not been cloned.
     *
     * @param desiredLocale Typically a user's language.
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching pair of the desired and a supported locale.
     * @draft ICU 65
     */
    Result getBestMatchResult(const Locale &desiredLocale, UErrorCode &errorCode) const;

/**
     * Returns the best match between the desired and supported locales.
     * If the result's desired locale is not nullptr, then it is a clone of
     * the best-matching desired locale. The Result object owns the clone.
     *
     * @param desiredLocales Typically a user's languages, in order of preference (descending).
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching pair of a desired and a supported locale.
     * @draft ICU 65
     */
    Result getBestMatchResult(Locale::Iterator &desiredLocales, UErrorCode &errorCode) const;
#endif  // U_HIDE_DRAFT_API

#ifndef U_HIDE_INTERNAL_API
 /**
 * Returns a fraction between 0 and 1, where 1 means that the languages are a
 * perfect match, and 0 means that they are completely different.
 *
 * This is mostly an implementation detail, and the precise values may change over time.
 * The implementation may use either the maximized forms or the others ones, or both.
 * The implementation may or may not rely on the forms to be consistent with each other.
 *
 * Callers should construct and use a matcher rather than match pairs of locales directly.
 *
 * @param desired Desired locale.
 * @param supported Supported locale.
 * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
 * or else the function returns immediately. Check for U_FAILURE()
 * on output or use with function chaining. (See User Guide for details.)
 * @return value between 0 and 1, inclusive.
 * @internal (has a known user)
 */
 double internalMatch(const Locale &desired, const Locale &supported, UErrorCode &errorCode) const;
#endif // U_HIDE_INTERNAL_API

private:
    LocaleMatcher(const Builder &builder, UErrorCode &errorCode);
    LocaleMatcher(const LocaleMatcher &other) = delete;
    LocaleMatcher &operator=(const LocaleMatcher &other) = delete;

int32_t putIfAbsent(const LSR &lsr, int32_t i, int32_t suppLength, UErrorCode &errorCode);

int32_t getBestSuppIndex(LSR desiredLSR, LocaleLsrIterator *remainingIter, UErrorCode &errorCode) const;

const XLikelySubtags &likelySubtags;
    const LocaleDistance &localeDistance;
    int32_t thresholdDistance;
    int32_t demotionPerDesiredLocale;
    ULocMatchFavorSubtag favorSubtag;
    ULocMatchDirection direction;

// These are in input order.
 const Locale ** supportedLocales;
 LSR *lsrs;
 int32_t supportedLocalesLength;
 // These are in preference order: 1. Default locale 2. paradigm locales 3. others.
 UHashtable *supportedLsrToIndex; // Map<LSR, Integer> stores index+1 because 0 is "not found"
 // Array versions of the supportedLsrToIndex keys and values.
 // The distance lookup loops over the supportedLSRs and returns the index of the best match.
 const LSR **supportedLSRs;
 int32_t *supportedIndexes;
 int32_t supportedLSRsLength;
 Locale *ownedDefaultLocale;
 const Locale *defaultLocale;
};

U_NAMESPACE_END

#endif  // U_FORCE_HIDE_DRAFT_API
#endif  // U_SHOW_CPLUSPLUS_API
#endif  // __LOCALEMATCHER_H__

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