FM / unicode

/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27158	0644	edit dl rm
appendable.h	8739	0644	edit dl rm
basictz.h	10163	0644	edit dl rm
brkiter.h	28478	0644	edit dl rm
bytestream.h	11013	0644	edit dl rm
bytestrie.h	21268	0644	edit dl rm
bytestriebuilder.h	7640	0644	edit dl rm
calendar.h	108424	0644	edit dl rm
caniter.h	7621	0644	edit dl rm
casemap.h	25933	0644	edit dl rm
char16ptr.h	7393	0644	edit dl rm
chariter.h	24638	0644	edit dl rm
choicfmt.h	24544	0644	edit dl rm
coleitr.h	14102	0644	edit dl rm
coll.h	57615	0644	edit dl rm
compactdecimalformat.h	7047	0644	edit dl rm
curramt.h	3869	0644	edit dl rm
currpinf.h	7479	0644	edit dl rm
currunit.h	4112	0644	edit dl rm
datefmt.h	41690	0644	edit dl rm
dbbi.h	1223	0644	edit dl rm
dcfmtsym.h	21101	0644	edit dl rm
decimfmt.h	89676	0644	edit dl rm
docmain.h	7380	0644	edit dl rm
dtfmtsym.h	39126	0644	edit dl rm
dtintrv.h	3935	0644	edit dl rm
dtitvfmt.h	50448	0644	edit dl rm
dtitvinf.h	19072	0644	edit dl rm
dtptngen.h	26692	0644	edit dl rm
dtrule.h	8898	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	8906	0644	edit dl rm
filteredbrk.h	5501	0644	edit dl rm
fmtable.h	25020	0644	edit dl rm
format.h	12802	0644	edit dl rm
formattedvalue.h	9987	0644	edit dl rm
fpositer.h	3107	0644	edit dl rm
gender.h	3408	0644	edit dl rm
gregocal.h	32642	0644	edit dl rm
icudataver.h	1049	0644	edit dl rm
icuplug.h	12109	0644	edit dl rm
idna.h	13000	0644	edit dl rm
listformatter.h	9004	0644	edit dl rm
localebuilder.h	11350	0644	edit dl rm
localematcher.h	27467	0644	edit dl rm
localpointer.h	19825	0644	edit dl rm
locdspnm.h	7292	0644	edit dl rm
locid.h	48804	0644	edit dl rm
measfmt.h	11690	0644	edit dl rm
measunit.h	107613	0644	edit dl rm
measure.h	4431	0644	edit dl rm
messagepattern.h	34517	0644	edit dl rm
msgfmt.h	45278	0644	edit dl rm
normalizer2.h	34466	0644	edit dl rm
normlzr.h	31690	0644	edit dl rm
nounit.h	2305	0644	edit dl rm
numberformatter.h	94505	0644	edit dl rm
numberrangeformatter.h	25790	0644	edit dl rm
numfmt.h	51034	0644	edit dl rm
numsys.h	7509	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5699	0644	edit dl rm
platform.h	28768	0644	edit dl rm
plurfmt.h	25847	0644	edit dl rm
plurrule.h	21316	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6471	0644	edit dl rm
rbbi.h	28413	0644	edit dl rm
rbnf.h	50021	0644	edit dl rm
rbtz.h	16210	0644	edit dl rm
regex.h	86385	0644	edit dl rm
region.h	9402	0644	edit dl rm
reldatefmt.h	22751	0644	edit dl rm
rep.h	9599	0644	edit dl rm
resbund.h	18513	0644	edit dl rm
schriter.h	6511	0644	edit dl rm
scientificnumberformatter.h	6589	0644	edit dl rm
search.h	22755	0644	edit dl rm
selfmt.h	14686	0644	edit dl rm
simpleformatter.h	12888	0644	edit dl rm
simpletz.h	46798	0644	edit dl rm
smpdtfmt.h	72778	0644	edit dl rm
sortkey.h	11452	0644	edit dl rm
std_string.h	1076	0644	edit dl rm
strenum.h	10157	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	10287	0644	edit dl rm
stringtriebuilder.h	15842	0644	edit dl rm
stsearch.h	21926	0644	edit dl rm
symtable.h	4374	0644	edit dl rm
tblcoll.h	37801	0644	edit dl rm
timezone.h	44858	0644	edit dl rm
tmunit.h	3479	0644	edit dl rm
tmutamt.h	5029	0644	edit dl rm
tmutfmt.h	7602	0644	edit dl rm
translit.h	67397	0644	edit dl rm
tzfmt.h	43961	0644	edit dl rm
tznames.h	17251	0644	edit dl rm
tzrule.h	36450	0644	edit dl rm
tztrans.h	6278	0644	edit dl rm
ubidi.h	91759	0644	edit dl rm
ubiditransform.h	13003	0644	edit dl rm
ubrk.h	25043	0644	edit dl rm
ucal.h	62463	0644	edit dl rm
ucasemap.h	15579	0644	edit dl rm
ucat.h	5478	0644	edit dl rm
uchar.h	148111	0644	edit dl rm
ucharstrie.h	23066	0644	edit dl rm
ucharstriebuilder.h	7645	0644	edit dl rm
uchriter.h	13747	0644	edit dl rm
uclean.h	11468	0644	edit dl rm
ucnv.h	85051	0644	edit dl rm
ucnvsel.h	6339	0644	edit dl rm
ucnv_cb.h	6738	0644	edit dl rm
ucnv_err.h	21481	0644	edit dl rm
ucol.h	62987	0644	edit dl rm
ucoleitr.h	10056	0644	edit dl rm
uconfig.h	12356	0644	edit dl rm
ucpmap.h	5663	0644	edit dl rm
ucptrie.h	23044	0644	edit dl rm
ucsdet.h	15043	0644	edit dl rm
ucurr.h	17122	0644	edit dl rm
udat.h	63902	0644	edit dl rm
udata.h	16004	0644	edit dl rm
udateintervalformat.h	12218	0644	edit dl rm
udatpg.h	27405	0644	edit dl rm
udisplaycontext.h	6084	0644	edit dl rm
uenum.h	7981	0644	edit dl rm
ufieldpositer.h	4513	0644	edit dl rm
uformattable.h	11233	0644	edit dl rm
uformattedvalue.h	12600	0644	edit dl rm
ugender.h	2106	0644	edit dl rm
uidna.h	34229	0644	edit dl rm
uiter.h	23299	0644	edit dl rm
uldnames.h	10733	0644	edit dl rm
ulistformatter.h	11043	0644	edit dl rm
uloc.h	55936	0644	edit dl rm
ulocdata.h	11572	0644	edit dl rm
umachine.h	16439	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24832	0644	edit dl rm
umutablecptrie.h	8490	0644	edit dl rm
unifilt.h	4091	0644	edit dl rm
unifunct.h	4151	0644	edit dl rm
unimatch.h	6244	0644	edit dl rm
unirepl.h	3464	0644	edit dl rm
uniset.h	68108	0644	edit dl rm
unistr.h	174627	0644	edit dl rm
unorm.h	21042	0644	edit dl rm
unorm2.h	25269	0644	edit dl rm
unum.h	56269	0644	edit dl rm
unumberformatter.h	31177	0644	edit dl rm
unumberrangeformatter.h	15737	0644	edit dl rm
unumsys.h	7430	0644	edit dl rm
uobject.h	10934	0644	edit dl rm
upluralrules.h	8997	0644	edit dl rm
uregex.h	73719	0644	edit dl rm
uregion.h	10047	0644	edit dl rm
ureldatefmt.h	17448	0644	edit dl rm
urename.h	137853	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37418	0644	edit dl rm
uscript.h	28291	0644	edit dl rm
usearch.h	40153	0644	edit dl rm
uset.h	45503	0644	edit dl rm
usetiter.h	9910	0644	edit dl rm
ushape.h	18430	0644	edit dl rm
uspoof.h	67425	0644	edit dl rm
usprep.h	8382	0644	edit dl rm
ustdio.h	39482	0644	edit dl rm
ustream.h	1934	0644	edit dl rm
ustring.h	74096	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59471	0644	edit dl rm
utf.h	8057	0644	edit dl rm
utf8.h	31572	0644	edit dl rm
utf16.h	23910	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	46929	0644	edit dl rm
utmscale.h	14107	0644	edit dl rm
utrace.h	17595	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31807	0644	edit dl rm
uvernum.h	6839	0644	edit dl rm
uversion.h	6137	0644	edit dl rm
vtzone.h	21303	0644	edit dl rm

Edit: /usr/include/unicode/coll.h (57615B)

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*   Copyright (C) 1996-2016, International Business Machines
*   Corporation and others.  All Rights Reserved.
******************************************************************************
*/

/**
 * \file
 * \brief C++ API: Collation Service.
 */

/**
* File coll.h
*
* Created by: Helena Shih
*
* Modification History:
*
*  Date        Name        Description
* 02/5/97      aliu        Modified createDefault to load collation data from
*                          binary files when possible.  Added related methods
*                          createCollationFromFile, chopLocale, createPathName.
* 02/11/97     aliu        Added members addToCache, findInCache, and fgCache.
* 02/12/97     aliu        Modified to create objects from RuleBasedCollator cache.
*                          Moved cache out of Collation class.
* 02/13/97     aliu        Moved several methods out of this class and into
*                          RuleBasedCollator, with modifications.  Modified
*                          createDefault() to call new RuleBasedCollator(Locale&)
*                          constructor.  General clean up and documentation.
* 02/20/97     helena      Added clone, operator==, operator!=, operator=, copy
*                          constructor and getDynamicClassID.
* 03/25/97     helena      Updated with platform independent data types.
* 05/06/97     helena      Added memory allocation error detection.
* 06/20/97     helena      Java class name change.
* 09/03/97     helena      Added createCollationKeyValues().
* 02/10/98     damiba      Added compare() with length as parameter.
* 04/23/99     stephen     Removed EDecompositionMode, merged with
*                          Normalizer::EMode.
* 11/02/99     helena      Collator performance enhancements.  Eliminates the
*                          UnicodeString construction and special case for NO_OP.
* 11/23/99     srl         More performance enhancements. Inlining of
*                          critical accessors.
* 05/15/00     helena      Added version information API.
* 01/29/01     synwee      Modified into a C++ wrapper which calls C apis
*                          (ucol.h).
* 2012-2014    markus      Rewritten in C++ again.
*/

#ifndef COLL_H
#define COLL_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#if !UCONFIG_NO_COLLATION

#include "unicode/uobject.h"
#include "unicode/ucol.h"
#include "unicode/unorm.h"
#include "unicode/locid.h"
#include "unicode/uniset.h"
#include "unicode/umisc.h"
#include "unicode/uiter.h"
#include "unicode/stringpiece.h"

U_NAMESPACE_BEGIN

class StringEnumeration;

#if !UCONFIG_NO_SERVICE
/**
 * @stable ICU 2.6
 */
class CollatorFactory;
#endif

/**
* @stable ICU 2.0
*/
class CollationKey;

/**
* The <code>Collator</code> class performs locale-sensitive string
* comparison. 
* You use this class to build searching and sorting routines for natural
* language text.
* 
* <code>Collator</code> is an abstract base class. Subclasses implement
* specific collation strategies. One subclass,
* <code>RuleBasedCollator</code>, is currently provided and is applicable
* to a wide set of languages. Other subclasses may be created to handle more
* specialized needs.
* 
* Like other locale-sensitive classes, you can use the static factory method,
* <code>createInstance</code>, to obtain the appropriate
* <code>Collator</code> object for a given locale. You will only need to
* look at the subclasses of <code>Collator</code> if you need to
* understand the details of a particular collation strategy or if you need to
* modify that strategy.
* 
* The following example shows how to compare two strings using the
* <code>Collator</code> for the default locale.
* \htmlonly<blockquote>\endhtmlonly
* <pre>
* \code
* // Compare two strings in the default locale
* UErrorCode success = U_ZERO_ERROR;
* Collator* myCollator = Collator::createInstance(success);
* if (myCollator->compare("abc", "ABC") < 0)
* cout << "abc is less than ABC" << endl;
* else
* cout << "abc is greater than or equal to ABC" << endl;
* \endcode
* </pre>
* \htmlonly</blockquote>\endhtmlonly
* 
* You can set a <code>Collator</code>'s strength attribute to
* determine the level of difference considered significant in comparisons.
* Five strengths are provided: <code>PRIMARY</code>, <code>SECONDARY</code>,
* <code>TERTIARY</code>, <code>QUATERNARY</code> and <code>IDENTICAL</code>.
* The exact assignment of strengths to language features is locale dependent.
* For example, in Czech, "e" and "f" are considered primary differences,
* while "e" and "\u00EA" are secondary differences, "e" and "E" are tertiary
* differences and "e" and "e" are identical. The following shows how both case
* and accents could be ignored for US English.
* \htmlonly<blockquote>\endhtmlonly
* <pre>
* \code
* //Get the Collator for US English and set its strength to PRIMARY
* UErrorCode success = U_ZERO_ERROR;
* Collator* usCollator = Collator::createInstance(Locale::getUS(), success);
* usCollator->setStrength(Collator::PRIMARY);
* if (usCollator->compare("abc", "ABC") == 0)
* cout << "'abc' and 'ABC' strings are equivalent with strength PRIMARY" << endl;
* \endcode
* </pre>
* \htmlonly</blockquote>\endhtmlonly
*
* The <code>getSortKey</code> methods
* convert a string to a series of bytes that can be compared bitwise against
* other sort keys using <code>strcmp()</code>. Sort keys are written as
* zero-terminated byte strings.
*
* Another set of APIs returns a <code>CollationKey</code> object that wraps
* the sort key bytes instead of returning the bytes themselves.
* 
* 
* Note: <code>Collator</code>s with different Locale,
* and CollationStrength settings will return different sort
* orders for the same set of strings. Locales have specific collation rules,
* and the way in which secondary and tertiary differences are taken into
* account, for example, will result in a different sorting order for same
* strings.
* 
* @see RuleBasedCollator
* @see CollationKey
* @see CollationElementIterator
* @see Locale
* @see Normalizer2
* @version 2.0 11/15/01
*/

class U_I18N_API Collator : public UObject {
public:

// Collator public enums -----------------------------------------------

/**
 * Base letter represents a primary difference. Set comparison level to
 * PRIMARY to ignore secondary and tertiary differences. 
 * Use this to set the strength of a Collator object. 
 * Example of primary difference, "abc" &lt; "abd"
 *
 * Diacritical differences on the same base letter represent a secondary
 * difference. Set comparison level to SECONDARY to ignore tertiary
 * differences. Use this to set the strength of a Collator object. 
 * Example of secondary difference, "&auml;" >> "a".
 *
 * Uppercase and lowercase versions of the same character represents a
 * tertiary difference. Set comparison level to TERTIARY to include all
 * comparison differences. Use this to set the strength of a Collator
 * object. 
 * Example of tertiary difference, "abc" &lt;&lt;&lt; "ABC".
 *
 * Two characters are considered "identical" when they have the same unicode
 * spellings. 
 * For example, "&auml;" == "&auml;".
 *
 * UCollationStrength is also used to determine the strength of sort keys
 * generated from Collator objects.
 * @stable ICU 2.0
 */
 enum ECollationStrength
 {
 PRIMARY = UCOL_PRIMARY, // 0
 SECONDARY = UCOL_SECONDARY, // 1
 TERTIARY = UCOL_TERTIARY, // 2
 QUATERNARY = UCOL_QUATERNARY, // 3
 IDENTICAL = UCOL_IDENTICAL // 15
 };

// Cannot use #ifndef U_HIDE_DEPRECATED_API for the following, it is
    // used by virtual methods that cannot have that conditional.
#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
     * LESS is returned if source string is compared to be less than target
     * string in the compare() method.
     * EQUAL is returned if source string is compared to be equal to target
     * string in the compare() method.
     * GREATER is returned if source string is compared to be greater than
     * target string in the compare() method.
     * @see Collator#compare
     * @deprecated ICU 2.6. Use C enum UCollationResult defined in ucol.h
     */
    enum EComparisonResult
    {
        LESS = UCOL_LESS,  // -1
        EQUAL = UCOL_EQUAL,  // 0
        GREATER = UCOL_GREATER  // 1
    };
#endif  // U_FORCE_HIDE_DEPRECATED_API

// Collator public destructor -----------------------------------------

/**
     * Destructor
     * @stable ICU 2.0
     */
    virtual ~Collator();

// Collator public methods --------------------------------------------

/**
     * Returns true if "other" is the same as "this".
     *
     * The base class implementation returns true if "other" has the same type/class as "this":
     * `typeid(*this) == typeid(other)`.
     *
     * Subclass implementations should do something like the following:
     *
     *     if (this == &other) { return true; }
     *     if (!Collator::operator==(other)) { return false; }  // not the same class
     *
     *     const MyCollator &o = (const MyCollator&)other;
     *     (compare this vs. o's subclass fields)
     *
     * @param other Collator object to be compared
     * @return true if other is the same as this.
     * @stable ICU 2.0
     */
    virtual bool operator==(const Collator& other) const;

/**
     * Returns true if "other" is not the same as "this".
     * Calls ! operator==(const Collator&) const which works for all subclasses.
     * @param other Collator object to be compared
     * @return true if other is not the same as this.
     * @stable ICU 2.0
     */
    virtual bool operator!=(const Collator& other) const;

/**
     * Makes a copy of this object.
     * @return a copy of this object, owned by the caller
     * @stable ICU 2.0
     */
    virtual Collator* clone() const = 0;

/**
     * Creates the Collator object for the current default locale.
     * The default locale is determined by Locale::getDefault.
     * The UErrorCode& err parameter is used to return status information to the user.
     * To check whether the construction succeeded or not, you should check the
     * value of U_SUCCESS(err).  If you wish more detailed information, you can
     * check for informational error results which still indicate success.
     * U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For
     * example, 'de_CH' was requested, but nothing was found there, so 'de' was
     * used. U_USING_DEFAULT_ERROR indicates that the default locale data was
     * used; neither the requested locale nor any of its fall back locales
     * could be found.
     * The caller owns the returned object and is responsible for deleting it.
     *
     * @param err    the error code status.
     * @return       the collation object of the default locale.(for example, en_US)
     * @see Locale#getDefault
     * @stable ICU 2.0
     */
    static Collator* U_EXPORT2 createInstance(UErrorCode&  err);

/**
 * Gets the collation object for the desired locale. The
 * resource of the desired locale will be loaded.
 *
 * Locale::getRoot() is the base collation table and all other languages are
 * built on top of it with additional language-specific modifications.
 *
 * For some languages, multiple collation types are available;
 * for example, "de@collation=phonebook".
 * Starting with ICU 54, collation attributes can be specified via locale keywords as well,
 * in the old locale extension syntax ("el@colCaseFirst=upper")
 * or in language tag syntax ("el-u-kf-upper").
 * See <a href="https://unicode-org.github.io/icu/userguide/collation/api">User Guide: Collation API</a>.
 *
 * The UErrorCode& err parameter is used to return status information to the user.
 * To check whether the construction succeeded or not, you should check
 * the value of U_SUCCESS(err). If you wish more detailed information, you
 * can check for informational error results which still indicate success.
 * U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For
 * example, 'de_CH' was requested, but nothing was found there, so 'de' was
 * used. U_USING_DEFAULT_ERROR indicates that the default locale data was
 * used; neither the requested locale nor any of its fall back locales
 * could be found.
 *
 * The caller owns the returned object and is responsible for deleting it.
 * @param loc The locale ID for which to open a collator.
 * @param err the error code status.
 * @return the created table-based collation object based on the desired
 * locale.
 * @see Locale
 * @see ResourceLoader
 * @stable ICU 2.2
 */
 static Collator* U_EXPORT2 createInstance(const Locale& loc, UErrorCode& err);

#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
     * The comparison function compares the character data stored in two
     * different strings. Returns information about whether a string is less
     * than, greater than or equal to another string.
     * @param source the source string to be compared with.
     * @param target the string that is to be compared with the source string.
     * @return Returns a byte value. GREATER if source is greater
     * than target; EQUAL if source is equal to target; LESS if source is less
     * than target
     * @deprecated ICU 2.6 use the overload with UErrorCode &
     */
    virtual EComparisonResult compare(const UnicodeString& source,
                                      const UnicodeString& target) const;
#endif  // U_FORCE_HIDE_DEPRECATED_API

/**
     * The comparison function compares the character data stored in two
     * different strings. Returns information about whether a string is less
     * than, greater than or equal to another string.
     * @param source the source string to be compared with.
     * @param target the string that is to be compared with the source string.
     * @param status possible error code
     * @return Returns an enum value. UCOL_GREATER if source is greater
     * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
     * than target
     * @stable ICU 2.6
     */
    virtual UCollationResult compare(const UnicodeString& source,
                                      const UnicodeString& target,
                                      UErrorCode &status) const = 0;

#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
     * Does the same thing as compare but limits the comparison to a specified
     * length
     * @param source the source string to be compared with.
     * @param target the string that is to be compared with the source string.
     * @param length the length the comparison is limited to
     * @return Returns a byte value. GREATER if source (up to the specified
     *         length) is greater than target; EQUAL if source (up to specified
     *         length) is equal to target; LESS if source (up to the specified
     *         length) is less  than target.
     * @deprecated ICU 2.6 use the overload with UErrorCode &
     */
    virtual EComparisonResult compare(const UnicodeString& source,
                                      const UnicodeString& target,
                                      int32_t length) const;
#endif  // U_FORCE_HIDE_DEPRECATED_API

/**
     * Does the same thing as compare but limits the comparison to a specified
     * length
     * @param source the source string to be compared with.
     * @param target the string that is to be compared with the source string.
     * @param length the length the comparison is limited to
     * @param status possible error code
     * @return Returns an enum value. UCOL_GREATER if source (up to the specified
     *         length) is greater than target; UCOL_EQUAL if source (up to specified
     *         length) is equal to target; UCOL_LESS if source (up to the specified
     *         length) is less  than target.
     * @stable ICU 2.6
     */
    virtual UCollationResult compare(const UnicodeString& source,
                                      const UnicodeString& target,
                                      int32_t length,
                                      UErrorCode &status) const = 0;

#ifndef U_FORCE_HIDE_DEPRECATED_API
 /**
 * The comparison function compares the character data stored in two
 * different string arrays. Returns information about whether a string array
 * is less than, greater than or equal to another string array.
 * Example of use:
 * <pre>
 * . char16_t ABC[] = {0x41, 0x42, 0x43, 0}; // = "ABC"
 * . char16_t abc[] = {0x61, 0x62, 0x63, 0}; // = "abc"
 * . UErrorCode status = U_ZERO_ERROR;
 * . Collator *myCollation =
 * . Collator::createInstance(Locale::getUS(), status);
 * . if (U_FAILURE(status)) return;
 * . myCollation->setStrength(Collator::PRIMARY);
 * . // result would be Collator::EQUAL ("abc" == "ABC")
 * . // (no primary difference between "abc" and "ABC")
 * . Collator::EComparisonResult result =
 * . myCollation->compare(abc, 3, ABC, 3);
 * . myCollation->setStrength(Collator::TERTIARY);
 * . // result would be Collator::LESS ("abc" &lt;&lt;&lt; "ABC")
 * . // (with tertiary difference between "abc" and "ABC")
 * . result = myCollation->compare(abc, 3, ABC, 3);
 * </pre>
 * @param source the source string array to be compared with.
 * @param sourceLength the length of the source string array. If this value
 * is equal to -1, the string array is null-terminated.
 * @param target the string that is to be compared with the source string.
 * @param targetLength the length of the target string array. If this value
 * is equal to -1, the string array is null-terminated.
 * @return Returns a byte value. GREATER if source is greater than target;
 * EQUAL if source is equal to target; LESS if source is less than
 * target
 * @deprecated ICU 2.6 use the overload with UErrorCode &
 */
 virtual EComparisonResult compare(const char16_t* source, int32_t sourceLength,
 const char16_t* target, int32_t targetLength)
 const;
#endif // U_FORCE_HIDE_DEPRECATED_API

/**
     * The comparison function compares the character data stored in two
     * different string arrays. Returns information about whether a string array
     * is less than, greater than or equal to another string array.
     * @param source the source string array to be compared with.
     * @param sourceLength the length of the source string array.  If this value
     *        is equal to -1, the string array is null-terminated.
     * @param target the string that is to be compared with the source string.
     * @param targetLength the length of the target string array.  If this value
     *        is equal to -1, the string array is null-terminated.
     * @param status possible error code
     * @return Returns an enum value. UCOL_GREATER if source is greater
     * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
     * than target
     * @stable ICU 2.6
     */
    virtual UCollationResult compare(const char16_t* source, int32_t sourceLength,
                                      const char16_t* target, int32_t targetLength,
                                      UErrorCode &status) const = 0;

/**
     * Compares two strings using the Collator.
     * Returns whether the first one compares less than/equal to/greater than
     * the second one.
     * This version takes UCharIterator input.
     * @param sIter the first ("source") string iterator
     * @param tIter the second ("target") string iterator
     * @param status ICU status
     * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER
     * @stable ICU 4.2
     */
    virtual UCollationResult compare(UCharIterator &sIter,
                                     UCharIterator &tIter,
                                     UErrorCode &status) const;

/**
     * Compares two UTF-8 strings using the Collator.
     * Returns whether the first one compares less than/equal to/greater than
     * the second one.
     * This version takes UTF-8 input.
     * Note that a StringPiece can be implicitly constructed
     * from a std::string or a NUL-terminated const char * string.
     * @param source the first UTF-8 string
     * @param target the second UTF-8 string
     * @param status ICU status
     * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER
     * @stable ICU 4.2
     */
    virtual UCollationResult compareUTF8(const StringPiece &source,
                                         const StringPiece &target,
                                         UErrorCode &status) const;

/**
 * Transforms the string into a series of characters that can be compared
 * with CollationKey::compareTo. It is not possible to restore the original
 * string from the chars in the sort key.
 * Use CollationKey::equals or CollationKey::compare to compare the
 * generated sort keys.
 * If the source string is null, a null collation key will be returned.
 *
 * Note that sort keys are often less efficient than simply doing comparison.
 * For more details, see the ICU User Guide.
 *
 * @param source the source string to be transformed into a sort key.
 * @param key the collation key to be filled in
 * @param status the error code status.
 * @return the collation key of the string based on the collation rules.
 * @see CollationKey#compare
 * @stable ICU 2.0
 */
 virtual CollationKey& getCollationKey(const UnicodeString& source,
 CollationKey& key,
 UErrorCode& status) const = 0;

/**
 * Transforms the string into a series of characters that can be compared
 * with CollationKey::compareTo. It is not possible to restore the original
 * string from the chars in the sort key.
 * Use CollationKey::equals or CollationKey::compare to compare the
 * generated sort keys.
 * If the source string is null, a null collation key will be returned.
 *
 * Note that sort keys are often less efficient than simply doing comparison.
 * For more details, see the ICU User Guide.
 *
 * @param source the source string to be transformed into a sort key.
 * @param sourceLength length of the collation key
 * @param key the collation key to be filled in
 * @param status the error code status.
 * @return the collation key of the string based on the collation rules.
 * @see CollationKey#compare
 * @stable ICU 2.0
 */
 virtual CollationKey& getCollationKey(const char16_t*source,
 int32_t sourceLength,
 CollationKey& key,
 UErrorCode& status) const = 0;
 /**
 * Generates the hash code for the collation object
 * @stable ICU 2.0
 */
 virtual int32_t hashCode(void) const = 0;

#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
     * Gets the locale of the Collator
     *
     * @param type can be either requested, valid or actual locale. For more
     *             information see the definition of ULocDataLocaleType in
     *             uloc.h
     * @param status the error code status.
     * @return locale where the collation data lives. If the collator
     *         was instantiated from rules, locale is empty.
     * @deprecated ICU 2.8 This API is under consideration for revision
     * in ICU 3.0.
     */
    virtual Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const = 0;
#endif  // U_FORCE_HIDE_DEPRECATED_API

/**
     * Convenience method for comparing two strings based on the collation rules.
     * @param source the source string to be compared with.
     * @param target the target string to be compared with.
     * @return true if the first string is greater than the second one,
     *         according to the collation rules. false, otherwise.
     * @see Collator#compare
     * @stable ICU 2.0
     */
    UBool greater(const UnicodeString& source, const UnicodeString& target)
                  const;

/**
     * Convenience method for comparing two strings based on the collation rules.
     * @param source the source string to be compared with.
     * @param target the target string to be compared with.
     * @return true if the first string is greater than or equal to the second
     *         one, according to the collation rules. false, otherwise.
     * @see Collator#compare
     * @stable ICU 2.0
     */
    UBool greaterOrEqual(const UnicodeString& source,
                         const UnicodeString& target) const;

/**
     * Convenience method for comparing two strings based on the collation rules.
     * @param source the source string to be compared with.
     * @param target the target string to be compared with.
     * @return true if the strings are equal according to the collation rules.
     *         false, otherwise.
     * @see Collator#compare
     * @stable ICU 2.0
     */
    UBool equals(const UnicodeString& source, const UnicodeString& target) const;

#ifndef U_FORCE_HIDE_DEPRECATED_API
 /**
 * Determines the minimum strength that will be used in comparison or
 * transformation.
 * E.g. with strength == SECONDARY, the tertiary difference is ignored
 * E.g. with strength == PRIMARY, the secondary and tertiary difference
 * are ignored.
 * @return the current comparison level.
 * @see Collator#setStrength
 * @deprecated ICU 2.6 Use getAttribute(UCOL_STRENGTH...) instead
 */
 virtual ECollationStrength getStrength(void) const;

/**
 * Sets the minimum strength to be used in comparison or transformation.
 * Example of use:
 * <pre>
 * \code
 * UErrorCode status = U_ZERO_ERROR;
 * Collator*myCollation = Collator::createInstance(Locale::getUS(), status);
 * if (U_FAILURE(status)) return;
 * myCollation->setStrength(Collator::PRIMARY);
 * // result will be "abc" == "ABC"
 * // tertiary differences will be ignored
 * Collator::ComparisonResult result = myCollation->compare("abc", "ABC");
 * \endcode
 * </pre>
 * @see Collator#getStrength
 * @param newStrength the new comparison level.
 * @deprecated ICU 2.6 Use setAttribute(UCOL_STRENGTH...) instead
 */
 virtual void setStrength(ECollationStrength newStrength);
#endif // U_FORCE_HIDE_DEPRECATED_API

/**
     * Retrieves the reordering codes for this collator.
     * @param dest The array to fill with the script ordering.
     * @param destCapacity The length of dest. If it is 0, then dest may be NULL and the function
     *  will only return the length of the result without writing any codes (pre-flighting).
     * @param status A reference to an error code value, which must not indicate
     * a failure before the function call.
     * @return The length of the script ordering array.
     * @see ucol_setReorderCodes
     * @see Collator#getEquivalentReorderCodes
     * @see Collator#setReorderCodes
     * @see UScriptCode
     * @see UColReorderCode
     * @stable ICU 4.8
     */
     virtual int32_t getReorderCodes(int32_t *dest,
                                     int32_t destCapacity,
                                     UErrorCode& status) const;

/**
 * Sets the ordering of scripts for this collator.
 *
 * The reordering codes are a combination of script codes and reorder codes.
 * @param reorderCodes An array of script codes in the new order. This can be NULL if the
 * length is also set to 0. An empty array will clear any reordering codes on the collator.
 * @param reorderCodesLength The length of reorderCodes.
 * @param status error code
 * @see ucol_setReorderCodes
 * @see Collator#getReorderCodes
 * @see Collator#getEquivalentReorderCodes
 * @see UScriptCode
 * @see UColReorderCode
 * @stable ICU 4.8
 */
 virtual void setReorderCodes(const int32_t* reorderCodes,
 int32_t reorderCodesLength,
 UErrorCode& status) ;

/**
     * Retrieves the reorder codes that are grouped with the given reorder code. Some reorder
     * codes will be grouped and must reorder together.
     * Beginning with ICU 55, scripts only reorder together if they are primary-equal,
     * for example Hiragana and Katakana.
     *
     * @param reorderCode The reorder code to determine equivalence for.
     * @param dest The array to fill with the script equivalence reordering codes.
     * @param destCapacity The length of dest. If it is 0, then dest may be NULL and the
     * function will only return the length of the result without writing any codes (pre-flighting).
     * @param status A reference to an error code value, which must not indicate
     * a failure before the function call.
     * @return The length of the of the reordering code equivalence array.
     * @see ucol_setReorderCodes
     * @see Collator#getReorderCodes
     * @see Collator#setReorderCodes
     * @see UScriptCode
     * @see UColReorderCode
     * @stable ICU 4.8
     */
    static int32_t U_EXPORT2 getEquivalentReorderCodes(int32_t reorderCode,
                                int32_t* dest,
                                int32_t destCapacity,
                                UErrorCode& status);

/**
     * Get name of the object for the desired Locale, in the desired language
     * @param objectLocale must be from getAvailableLocales
     * @param displayLocale specifies the desired locale for output
     * @param name the fill-in parameter of the return value
     * @return display-able name of the object for the object locale in the
     *         desired language
     * @stable ICU 2.0
     */
    static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
                                         const Locale& displayLocale,
                                         UnicodeString& name);

/**
    * Get name of the object for the desired Locale, in the language of the
    * default locale.
    * @param objectLocale must be from getAvailableLocales
    * @param name the fill-in parameter of the return value
    * @return name of the object for the desired locale in the default language
    * @stable ICU 2.0
    */
    static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
                                         UnicodeString& name);

/**
 * Get the set of Locales for which Collations are installed.
 *
 * Note this does not include locales supported by registered collators.
 * If collators might have been registered, use the overload of getAvailableLocales
 * that returns a StringEnumeration.
 *
 * @param count the output parameter of number of elements in the locale list
 * @return the list of available locales for which collations are installed
 * @stable ICU 2.0
 */
 static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);

/**
     * Return a StringEnumeration over the locales available at the time of the call,
     * including registered locales.  If a severe error occurs (such as out of memory
     * condition) this will return null. If there is no locale data, an empty enumeration
     * will be returned.
     * @return a StringEnumeration over the locales available at the time of the call
     * @stable ICU 2.6
     */
    static StringEnumeration* U_EXPORT2 getAvailableLocales(void);

/**
     * Create a string enumerator of all possible keywords that are relevant to
     * collation. At this point, the only recognized keyword for this
     * service is "collation".
     * @param status input-output error code
     * @return a string enumeration over locale strings. The caller is
     * responsible for closing the result.
     * @stable ICU 3.0
     */
    static StringEnumeration* U_EXPORT2 getKeywords(UErrorCode& status);

/**
     * Given a keyword, create a string enumeration of all values
     * for that keyword that are currently in use.
     * @param keyword a particular keyword as enumerated by
     * ucol_getKeywords. If any other keyword is passed in, status is set
     * to U_ILLEGAL_ARGUMENT_ERROR.
     * @param status input-output error code
     * @return a string enumeration over collation keyword values, or NULL
     * upon error. The caller is responsible for deleting the result.
     * @stable ICU 3.0
     */
    static StringEnumeration* U_EXPORT2 getKeywordValues(const char *keyword, UErrorCode& status);

/**
     * Given a key and a locale, returns an array of string values in a preferred
     * order that would make a difference. These are all and only those values where
     * the open (creation) of the service with the locale formed from the input locale
     * plus input keyword and that value has different behavior than creation with the
     * input locale alone.
     * @param keyword        one of the keys supported by this service.  For now, only
     *                      "collation" is supported.
     * @param locale        the locale
     * @param commonlyUsed  if set to true it will return only commonly used values
     *                      with the given locale in preferred order.  Otherwise,
     *                      it will return all the available values for the locale.
     * @param status ICU status
     * @return a string enumeration over keyword values for the given key and the locale.
     * @stable ICU 4.2
     */
    static StringEnumeration* U_EXPORT2 getKeywordValuesForLocale(const char* keyword, const Locale& locale,
                                                                    UBool commonlyUsed, UErrorCode& status);

/**
 * Return the functionally equivalent locale for the given
 * requested locale, with respect to given keyword, for the
 * collation service. If two locales return the same result, then
 * collators instantiated for these locales will behave
 * equivalently. The converse is not always true; two collators
 * may in fact be equivalent, but return different results, due to
 * internal details. The return result has no other meaning than
 * that stated above, and implies nothing as to the relationship
 * between the two locales. This is intended for use by
 * applications who wish to cache collators, or otherwise reuse
 * collators when possible. The functional equivalent may change
 * over time. For more information, please see the <a
 * href="https://unicode-org.github.io/icu/userguide/locale#locales-and-services">
 * Locales and Services</a> section of the ICU User Guide.
 * @param keyword a particular keyword as enumerated by
 * ucol_getKeywords.
 * @param locale the requested locale
 * @param isAvailable reference to a fillin parameter that
 * indicates whether the requested locale was 'available' to the
 * collation service. A locale is defined as 'available' if it
 * physically exists within the collation locale data.
 * @param status reference to input-output error code
 * @return the functionally equivalent collation locale, or the root
 * locale upon error.
 * @stable ICU 3.0
 */
 static Locale U_EXPORT2 getFunctionalEquivalent(const char* keyword, const Locale& locale,
 UBool& isAvailable, UErrorCode& status);

#if !UCONFIG_NO_SERVICE
    /**
     * Register a new Collator.  The collator will be adopted.
     * Because ICU may choose to cache collators internally, this must be
     * called at application startup, prior to any calls to
     * Collator::createInstance to avoid undefined behavior.
     * @param toAdopt the Collator instance to be adopted
     * @param locale the locale with which the collator will be associated
     * @param status the in/out status code, no special meanings are assigned
     * @return a registry key that can be used to unregister this collator
     * @stable ICU 2.6
     */
    static URegistryKey U_EXPORT2 registerInstance(Collator* toAdopt, const Locale& locale, UErrorCode& status);

/**
     * Register a new CollatorFactory.  The factory will be adopted.
     * Because ICU may choose to cache collators internally, this must be
     * called at application startup, prior to any calls to
     * Collator::createInstance to avoid undefined behavior.
     * @param toAdopt the CollatorFactory instance to be adopted
     * @param status the in/out status code, no special meanings are assigned
     * @return a registry key that can be used to unregister this collator
     * @stable ICU 2.6
     */
    static URegistryKey U_EXPORT2 registerFactory(CollatorFactory* toAdopt, UErrorCode& status);

/**
     * Unregister a previously-registered Collator or CollatorFactory
     * using the key returned from the register call.  Key becomes
     * invalid after a successful call and should not be used again.
     * The object corresponding to the key will be deleted.
     * Because ICU may choose to cache collators internally, this should
     * be called during application shutdown, after all calls to
     * Collator::createInstance to avoid undefined behavior.
     * @param key the registry key returned by a previous call to registerInstance
     * @param status the in/out status code, no special meanings are assigned
     * @return true if the collator for the key was successfully unregistered
     * @stable ICU 2.6
     */
    static UBool U_EXPORT2 unregister(URegistryKey key, UErrorCode& status);
#endif /* UCONFIG_NO_SERVICE */

/**
     * Gets the version information for a Collator.
     * @param info the version # information, the result will be filled in
     * @stable ICU 2.0
     */
    virtual void getVersion(UVersionInfo info) const = 0;

/**
     * Returns a unique class ID POLYMORPHICALLY. Pure virtual method.
     * This method is to implement a simple version of RTTI, since not all C++
     * compilers support genuine RTTI. Polymorphic operator==() and clone()
     * methods call this method.
     * @return The class ID for this object. All objects of a given class have
     *         the same class ID.  Objects of other classes have different class
     *         IDs.
     * @stable ICU 2.0
     */
    virtual UClassID getDynamicClassID(void) const override = 0;

/**
     * Universal attribute setter
     * @param attr attribute type
     * @param value attribute value
     * @param status to indicate whether the operation went on smoothly or
     *        there were errors
     * @stable ICU 2.2
     */
    virtual void setAttribute(UColAttribute attr, UColAttributeValue value,
                              UErrorCode &status) = 0;

/**
     * Universal attribute getter
     * @param attr attribute type
     * @param status to indicate whether the operation went on smoothly or
     *        there were errors
     * @return attribute value
     * @stable ICU 2.2
     */
    virtual UColAttributeValue getAttribute(UColAttribute attr,
                                            UErrorCode &status) const = 0;

/**
     * Sets the variable top to the top of the specified reordering group.
     * The variable top determines the highest-sorting character
     * which is affected by UCOL_ALTERNATE_HANDLING.
     * If that attribute is set to UCOL_NON_IGNORABLE, then the variable top has no effect.
     *
     * The base class implementation sets U_UNSUPPORTED_ERROR.
     * @param group one of UCOL_REORDER_CODE_SPACE, UCOL_REORDER_CODE_PUNCTUATION,
     *              UCOL_REORDER_CODE_SYMBOL, UCOL_REORDER_CODE_CURRENCY;
     *              or UCOL_REORDER_CODE_DEFAULT to restore the default max variable group
     * @param errorCode Standard 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 *this
     * @see getMaxVariable
     * @stable ICU 53
     */
    virtual Collator &setMaxVariable(UColReorderCode group, UErrorCode &errorCode);

/**
     * Returns the maximum reordering group whose characters are affected by UCOL_ALTERNATE_HANDLING.
     *
     * The base class implementation returns UCOL_REORDER_CODE_PUNCTUATION.
     * @return the maximum variable reordering group.
     * @see setMaxVariable
     * @stable ICU 53
     */
    virtual UColReorderCode getMaxVariable() const;

#ifndef U_FORCE_HIDE_DEPRECATED_API
 /**
 * Sets the variable top to the primary weight of the specified string.
 *
 * Beginning with ICU 53, the variable top is pinned to
 * the top of one of the supported reordering groups,
 * and it must not be beyond the last of those groups.
 * See setMaxVariable().
 * @param varTop one or more (if contraction) char16_ts to which the variable top should be set
 * @param len length of variable top string. If -1 it is considered to be zero terminated.
 * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: 
 * U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such contraction 
 * U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond
 * the last reordering group supported by setMaxVariable()
 * @return variable top primary weight
 * @deprecated ICU 53 Call setMaxVariable() instead.
 */
 virtual uint32_t setVariableTop(const char16_t *varTop, int32_t len, UErrorCode &status) = 0;

/**
 * Sets the variable top to the primary weight of the specified string.
 *
 * Beginning with ICU 53, the variable top is pinned to
 * the top of one of the supported reordering groups,
 * and it must not be beyond the last of those groups.
 * See setMaxVariable().
 * @param varTop a UnicodeString size 1 or more (if contraction) of char16_ts to which the variable top should be set
 * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: 
 * U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such contraction 
 * U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond
 * the last reordering group supported by setMaxVariable()
 * @return variable top primary weight
 * @deprecated ICU 53 Call setMaxVariable() instead.
 */
 virtual uint32_t setVariableTop(const UnicodeString &varTop, UErrorCode &status) = 0;

/**
     * Sets the variable top to the specified primary weight.
     *
     * Beginning with ICU 53, the variable top is pinned to
     * the top of one of the supported reordering groups,
     * and it must not be beyond the last of those groups.
     * See setMaxVariable().
     * @param varTop primary weight, as returned by setVariableTop or ucol_getVariableTop
     * @param status error code
     * @deprecated ICU 53 Call setMaxVariable() instead.
     */
    virtual void setVariableTop(uint32_t varTop, UErrorCode &status) = 0;
#endif  // U_FORCE_HIDE_DEPRECATED_API

/**
     * Gets the variable top value of a Collator.
     * @param status error code (not changed by function). If error code is set, the return value is undefined.
     * @return the variable top primary weight
     * @see getMaxVariable
     * @stable ICU 2.0
     */
    virtual uint32_t getVariableTop(UErrorCode &status) const = 0;

/**
     * Get a UnicodeSet that contains all the characters and sequences
     * tailored in this collator.
     * @param status      error code of the operation
     * @return a pointer to a UnicodeSet object containing all the
     *         code points and sequences that may sort differently than
     *         in the root collator. The object must be disposed of by using delete
     * @stable ICU 2.4
     */
    virtual UnicodeSet *getTailoredSet(UErrorCode &status) const;

#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
     * Same as clone().
     * The base class implementation simply calls clone().
     * @return a copy of this object, owned by the caller
     * @see clone()
     * @deprecated ICU 50 no need to have two methods for cloning
     */
    virtual Collator* safeClone() const;
#endif  // U_FORCE_HIDE_DEPRECATED_API

/**
     * Get the sort key as an array of bytes from a UnicodeString.
     * Sort key byte arrays are zero-terminated and can be compared using
     * strcmp().
     *
     * Note that sort keys are often less efficient than simply doing comparison.
     * For more details, see the ICU User Guide.
     *
     * @param source string to be processed.
     * @param result buffer to store result in. If NULL, number of bytes needed
     *        will be returned.
     * @param resultLength length of the result buffer. If if not enough the
     *        buffer will be filled to capacity.
     * @return Number of bytes needed for storing the sort key
     * @stable ICU 2.2
     */
    virtual int32_t getSortKey(const UnicodeString& source,
                              uint8_t* result,
                              int32_t resultLength) const = 0;

/**
     * Get the sort key as an array of bytes from a char16_t buffer.
     * Sort key byte arrays are zero-terminated and can be compared using
     * strcmp().
     *
     * Note that sort keys are often less efficient than simply doing comparison.
     * For more details, see the ICU User Guide.
     *
     * @param source string to be processed.
     * @param sourceLength length of string to be processed.
     *        If -1, the string is 0 terminated and length will be decided by the
     *        function.
     * @param result buffer to store result in. If NULL, number of bytes needed
     *        will be returned.
     * @param resultLength length of the result buffer. If if not enough the
     *        buffer will be filled to capacity.
     * @return Number of bytes needed for storing the sort key
     * @stable ICU 2.2
     */
    virtual int32_t getSortKey(const char16_t*source, int32_t sourceLength,
                               uint8_t*result, int32_t resultLength) const = 0;

/**
 * Produce a bound for a given sortkey and a number of levels.
 * Return value is always the number of bytes needed, regardless of
 * whether the result buffer was big enough or even valid. 
 * Resulting bounds can be used to produce a range of strings that are
 * between upper and lower bounds. For example, if bounds are produced
 * for a sortkey of string "smith", strings between upper and lower
 * bounds with one level would include "Smith", "SMITH", "sMiTh". 
 * There are two upper bounds that can be produced. If UCOL_BOUND_UPPER
 * is produced, strings matched would be as above. However, if bound
 * produced using UCOL_BOUND_UPPER_LONG is used, the above example will
 * also match "Smithsonian" and similar. 
 * For more on usage, see example in cintltst/capitst.c in procedure
 * TestBounds.
 * Sort keys may be compared using <TT>strcmp</TT>.
 * @param source The source sortkey.
 * @param sourceLength The length of source, or -1 if null-terminated.
 * (If an unmodified sortkey is passed, it is always null
 * terminated).
 * @param boundType Type of bound required. It can be UCOL_BOUND_LOWER, which
 * produces a lower inclusive bound, UCOL_BOUND_UPPER, that
 * produces upper bound that matches strings of the same length
 * or UCOL_BOUND_UPPER_LONG that matches strings that have the
 * same starting substring as the source string.
 * @param noOfLevels Number of levels required in the resulting bound (for most
 * uses, the recommended value is 1). See users guide for
 * explanation on number of levels a sortkey can have.
 * @param result A pointer to a buffer to receive the resulting sortkey.
 * @param resultLength The maximum size of result.
 * @param status Used for returning error code if something went wrong. If the
 * number of levels requested is higher than the number of levels
 * in the source key, a warning (U_SORT_KEY_TOO_SHORT_WARNING) is
 * issued.
 * @return The size needed to fully store the bound.
 * @see ucol_keyHashCode
 * @stable ICU 2.1
 */
 static int32_t U_EXPORT2 getBound(const uint8_t *source,
 int32_t sourceLength,
 UColBoundMode boundType,
 uint32_t noOfLevels,
 uint8_t *result,
 int32_t resultLength,
 UErrorCode &status);

protected:

// Collator protected constructors -------------------------------------

/**
    * Default constructor.
    * Constructor is different from the old default Collator constructor.
    * The task for determining the default collation strength and normalization
    * mode is left to the child class.
    * @stable ICU 2.0
    */
    Collator();

#ifndef U_HIDE_DEPRECATED_API
    /**
    * Constructor.
    * Empty constructor, does not handle the arguments.
    * This constructor is done for backward compatibility with 1.7 and 1.8.
    * The task for handling the argument collation strength and normalization
    * mode is left to the child class.
    * @param collationStrength collation strength
    * @param decompositionMode
    * @deprecated ICU 2.4. Subclasses should use the default constructor
    * instead and handle the strength and normalization mode themselves.
    */
    Collator(UCollationStrength collationStrength,
             UNormalizationMode decompositionMode);
#endif  /* U_HIDE_DEPRECATED_API */

/**
    * Copy constructor.
    * @param other Collator object to be copied from
    * @stable ICU 2.0
    */
    Collator(const Collator& other);

public:
   /**
    * Used internally by registration to define the requested and valid locales.
    * @param requestedLocale the requested locale
    * @param validLocale the valid locale
    * @param actualLocale the actual locale
    * @internal
    */
    virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale);

/** Get the short definition string for a collator. This internal API harvests the collator's
     *  locale and the attribute set and produces a string that can be used for opening
     *  a collator with the same attributes using the ucol_openFromShortString API.
     *  This string will be normalized.
     *  The structure and the syntax of the string is defined in the "Naming collators"
     *  section of the users guide:
     *  https://unicode-org.github.io/icu/userguide/collation/concepts#collator-naming-scheme
     *  This function supports preflighting.
     *
     *  This is internal, and intended to be used with delegate converters.
     *
     *  @param locale a locale that will appear as a collators locale in the resulting
     *                short string definition. If NULL, the locale will be harvested
     *                from the collator.
     *  @param buffer space to hold the resulting string
     *  @param capacity capacity of the buffer
     *  @param status for returning errors. All the preflighting errors are featured
     *  @return length of the resulting string
     *  @see ucol_openFromShortString
     *  @see ucol_normalizeShortDefinitionString
     *  @see ucol_getShortDefinitionString
     *  @internal
     */
    virtual int32_t internalGetShortDefinitionString(const char *locale,
                                                     char *buffer,
                                                     int32_t capacity,
                                                     UErrorCode &status) const;

/**
     * Implements ucol_strcollUTF8().
     * @internal
     */
    virtual UCollationResult internalCompareUTF8(
            const char *left, int32_t leftLength,
            const char *right, int32_t rightLength,
            UErrorCode &errorCode) const;

/**
     * Implements ucol_nextSortKeyPart().
     * @internal
     */
    virtual int32_t
    internalNextSortKeyPart(
            UCharIterator *iter, uint32_t state[2],
            uint8_t *dest, int32_t count, UErrorCode &errorCode) const;

#ifndef U_HIDE_INTERNAL_API
 /** @internal */
 static inline Collator *fromUCollator(UCollator *uc) {
 return reinterpret_cast<Collator *>(uc);
 }
 /** @internal */
 static inline const Collator *fromUCollator(const UCollator *uc) {
 return reinterpret_cast<const Collator *>(uc);
 }
 /** @internal */
 inline UCollator *toUCollator() {
 return reinterpret_cast<UCollator *>(this);
 }
 /** @internal */
 inline const UCollator *toUCollator() const {
 return reinterpret_cast<const UCollator *>(this);
 }
#endif // U_HIDE_INTERNAL_API

private:
    /**
     * Assignment operator. Private for now.
     */
    Collator& operator=(const Collator& other);

friend class CFactory;
    friend class SimpleCFactory;
    friend class ICUCollatorFactory;
    friend class ICUCollatorService;
    static Collator* makeInstance(const Locale& desiredLocale,
                                  UErrorCode& status);
};

#if !UCONFIG_NO_SERVICE
/**
 * A factory, used with registerFactory, the creates multiple collators and provides
 * display names for them. A factory supports some number of locales-- these are the
 * locales for which it can create collators. The factory can be visible, in which
 * case the supported locales will be enumerated by getAvailableLocales, or invisible,
 * in which they are not. Invisible locales are still supported, they are just not
 * listed by getAvailableLocales.
 * 
 * If standard locale display names are sufficient, Collator instances can
 * be registered using registerInstance instead.
 * 
 * Note: if the collators are to be used from C APIs, they must be instances
 * of RuleBasedCollator.
 *
 * @stable ICU 2.6
 */
class U_I18N_API CollatorFactory : public UObject {
public:

/**
     * Destructor
     * @stable ICU 3.0
     */
    virtual ~CollatorFactory();

/**
     * Return true if this factory is visible.  Default is true.
     * If not visible, the locales supported by this factory will not
     * be listed by getAvailableLocales.
     * @return true if the factory is visible.
     * @stable ICU 2.6
     */
    virtual UBool visible(void) const;

/**
     * Return a collator for the provided locale.  If the locale
     * is not supported, return NULL.
     * @param loc the locale identifying the collator to be created.
     * @return a new collator if the locale is supported, otherwise NULL.
     * @stable ICU 2.6
     */
    virtual Collator* createCollator(const Locale& loc) = 0;

/**
     * Return the name of the collator for the objectLocale, localized for the displayLocale.
     * If objectLocale is not supported, or the factory is not visible, set the result string
     * to bogus.
     * @param objectLocale the locale identifying the collator
     * @param displayLocale the locale for which the display name of the collator should be localized
     * @param result an output parameter for the display name, set to bogus if not supported.
     * @return the display name
     * @stable ICU 2.6
     */
    virtual  UnicodeString& getDisplayName(const Locale& objectLocale,
                                           const Locale& displayLocale,
                                           UnicodeString& result);

/**
     * Return an array of all the locale names directly supported by this factory.
     * The number of names is returned in count.  This array is owned by the factory.
     * Its contents must never change.
     * @param count output parameter for the number of locales supported by the factory
     * @param status the in/out error code
     * @return a pointer to an array of count UnicodeStrings.
     * @stable ICU 2.6
     */
    virtual const UnicodeString * getSupportedIDs(int32_t &count, UErrorCode& status) = 0;
};
#endif /* UCONFIG_NO_SERVICE */

// Collator inline methods -----------------------------------------------

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_COLLATION */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif

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