golden hour

/opt/alt/libicu/usr/include/unicode

File/Folder	Size	Actions
alphaindex.h	26.42 KB
appendable.h	8.43 KB
basictz.h	8.84 KB
brkiter.h	27.53 KB
bytestream.h	9.54 KB
bytestrie.h	19.26 KB
bytestriebuilder.h	7.02 KB
calendar.h	105.06 KB
caniter.h	7.37 KB
casemap.h	25.26 KB
char16ptr.h	7.16 KB
chariter.h	24 KB
choicfmt.h	23.85 KB
coleitr.h	13.7 KB
coll.h	55.59 KB
compactdecimalformat.h	6.81 KB
curramt.h	3.69 KB
currpinf.h	7.24 KB
currunit.h	3.52 KB
datefmt.h	40.37 KB
dbbi.h	1.11 KB
dcfmtsym.h	20.1 KB
decimfmt.h	86.4 KB
docmain.h	6.72 KB
dtfmtsym.h	37.64 KB
dtintrv.h	3.76 KB
dtitvfmt.h	42.87 KB
dtitvinf.h	18.46 KB
dtptngen.h	25.03 KB
dtrule.h	8.62 KB
edits.h	20.67 KB
enumset.h	2.08 KB
errorcode.h	4.78 KB
fieldpos.h	8.63 KB
filteredbrk.h	5.24 KB
fmtable.h	24.36 KB
format.h	12.44 KB
fpositer.h	2.98 KB
gender.h	3.27 KB
gregocal.h	31.57 KB
icudataver.h	1.03 KB
icuplug.h	11.88 KB
idna.h	12.63 KB
listformatter.h	6.18 KB
localpointer.h	16.88 KB
locdspnm.h	7.05 KB
locid.h	44.92 KB
measfmt.h	12.01 KB
measunit.h	38.5 KB
measure.h	4.26 KB
messagepattern.h	33.65 KB
msgfmt.h	43.36 KB
normalizer2.h	33.97 KB
normlzr.h	30.74 KB
nounit.h	2.63 KB
numberformatter.h	87.07 KB
numberrangeformatter.h	28.74 KB
numfmt.h	49.14 KB
numsys.h	6.73 KB
parseerr.h	3.08 KB
parsepos.h	5.45 KB
platform.h	27.1 KB
plurfmt.h	25.18 KB
plurrule.h	17.42 KB
ptypes.h	3.49 KB
putil.h	6.33 KB
rbbi.h	26.41 KB
rbnf.h	49.79 KB
rbtz.h	15.47 KB
regex.h	84.91 KB
region.h	9.12 KB
reldatefmt.h	14.46 KB
rep.h	9.5 KB
resbund.h	18.01 KB
schriter.h	6.26 KB
scientificnumberformatter.h	6.32 KB
search.h	22.21 KB
selfmt.h	14.24 KB
simpleformatter.h	11.43 KB
simpletz.h	45.3 KB
smpdtfmt.h	70.74 KB
sortkey.h	11.12 KB
std_string.h	1015 B
strenum.h	10.04 KB
stringoptions.h	5.79 KB
stringpiece.h	6.46 KB
stringtriebuilder.h	15.27 KB
stsearch.h	21.29 KB
symtable.h	4.21 KB
tblcoll.h	36.4 KB
timezone.h	40.88 KB
tmunit.h	3.29 KB
tmutamt.h	4.8 KB
tmutfmt.h	7.79 KB
translit.h	65.76 KB
tzfmt.h	42.82 KB
tznames.h	16.79 KB
tzrule.h	35.32 KB
tztrans.h	6.07 KB
ubidi.h	89.56 KB
ubiditransform.h	12.65 KB
ubrk.h	23.97 KB
ucal.h	55.2 KB
ucasemap.h	15.18 KB
ucat.h	5.36 KB
uchar.h	139.96 KB
ucharstrie.h	21.06 KB
ucharstriebuilder.h	7.14 KB
uchriter.h	13.14 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	61.39 KB
ucoleitr.h	9.46 KB
uconfig.h	11.67 KB
ucpmap.h	5.58 KB
ucptrie.h	22.29 KB
ucsdet.h	14.67 KB
ucurr.h	15.57 KB
udat.h	60.13 KB
udata.h	15.53 KB
udateintervalformat.h	6.79 KB
udatpg.h	26.04 KB
udisplaycontext.h	5.89 KB
uenum.h	7.78 KB
ufieldpositer.h	4.36 KB
uformattable.h	10.94 KB
ugender.h	2 KB
uidna.h	33.37 KB
uiter.h	22.77 KB
uldnames.h	10.45 KB
ulistformatter.h	5.03 KB
uloc.h	50.75 KB
ulocdata.h	11.26 KB
umachine.h	13.19 KB
umisc.h	1.33 KB
umsg.h	24.23 KB
umutablecptrie.h	8.28 KB
unifilt.h	3.63 KB
unifunct.h	3.98 KB
unimatch.h	6.04 KB
unirepl.h	3.32 KB
uniset.h	64.25 KB
unistr.h	174.4 KB
unorm.h	20.45 KB
unorm2.h	24.66 KB
unum.h	53.38 KB
unumberformatter.h	23.76 KB
unumsys.h	7.14 KB
uobject.h	10.7 KB
upluralrules.h	6.72 KB
uregex.h	72.05 KB
uregion.h	9.84 KB
ureldatefmt.h	12.22 KB
urename.h	127.73 KB
urep.h	5.38 KB
ures.h	36.53 KB
uscript.h	26.52 KB
usearch.h	38.12 KB
uset.h	40 KB
usetiter.h	9.49 KB
ushape.h	18 KB
uspoof.h	66.03 KB
usprep.h	8.14 KB
ustdio.h	38.54 KB
ustream.h	1.8 KB
ustring.h	72.47 KB
ustringtrie.h	3.15 KB
utext.h	58.11 KB
utf.h	7.86 KB
utf16.h	22.33 KB
utf32.h	763 B
utf8.h	30.01 KB
utf_old.h	43.78 KB
utmscale.h	13.78 KB
utrace.h	13.89 KB
utrans.h	25.54 KB
utypes.h	30.48 KB
uvernum.h	6.06 KB
uversion.h	6.7 KB
vtzone.h	20.17 KB

Edit: alphaindex.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
*   Copyright (C) 2011-2014 International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*/

#ifndef INDEXCHARS_H
#define INDEXCHARS_H

#include "unicode/utypes.h"
#include "unicode/uobject.h"
#include "unicode/locid.h"
#include "unicode/unistr.h"

#if !UCONFIG_NO_COLLATION

/**
 * \file
 * \brief C++ API: Index Characters
 */

U_CDECL_BEGIN

/**
 * Constants for Alphabetic Index Label Types.
 * The form of these enum constants anticipates having a plain C API
 * for Alphabetic Indexes that will also use them.
 * @stable ICU 4.8
 */
typedef enum UAlphabeticIndexLabelType {
    /**
     *  Normal Label, typically the starting letter of the names
     *  in the bucket with this label.
     * @stable ICU 4.8
     */
    U_ALPHAINDEX_NORMAL    = 0,

/**
     * Undeflow Label.  The bucket with this label contains names
     * in scripts that sort before any of the bucket labels in this index.
     * @stable ICU 4.8
     */
    U_ALPHAINDEX_UNDERFLOW = 1,

/**
     * Inflow Label.  The bucket with this label contains names
     * in scripts that sort between two of the bucket labels in this index.
     * Inflow labels are created when an index contains normal labels for
     * multiple scripts, and skips other scripts that sort between some of the
     * included scripts.
     * @stable ICU 4.8
     */
    U_ALPHAINDEX_INFLOW    = 2,

/**
     * Overflow Label. Te bucket with this label contains names in scripts
     * that sort after all of the bucket labels in this index.
     * @stable ICU 4.8
     */
    U_ALPHAINDEX_OVERFLOW  = 3
} UAlphabeticIndexLabelType;

struct UHashtable;
U_CDECL_END

U_NAMESPACE_BEGIN

// Forward Declarations

class BucketList;
class Collator;
class RuleBasedCollator;
class StringEnumeration;
class UnicodeSet;
class UVector;

/**
 * AlphabeticIndex supports the creation of a UI index appropriate for a given language.
 * It can support either direct use, or use with a client that doesn't support localized collation.
 * The following is an example of what an index might look like in a UI:
 * 
 * <pre>
 *  <b>... A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  ...</b>
 *
 *  <b>A</b>
 *     Addison
 *     Albertson
 *     Azensky
 *  <b>B</b>
 *     Baker
 *  ...
 * </pre>
 *
 * The class can generate a list of labels for use as a UI "index", that is, a list of
 * clickable characters (or character sequences) that allow the user to see a segment
 * (bucket) of a larger "target" list. That is, each label corresponds to a bucket in
 * the target list, where everything in the bucket is greater than or equal to the character
 * (according to the locale's collation). Strings can be added to the index;
 * they will be in sorted order in the right bucket.
 * <p>
 * The class also supports having buckets for strings before the first (underflow),
 * after the last (overflow), and between scripts (inflow). For example, if the index
 * is constructed with labels for Russian and English, Greek characters would fall
 * into an inflow bucket between the other two scripts.
 * <p>
 * The AlphabeticIndex class is not intended for public subclassing.
 *
 * <p><em>Note:</em> If you expect to have a lot of ASCII or Latin characters
 * as well as characters from the user's language,
 * then it is a good idea to call addLabels(Locale::getEnglish(), status).</p>
 *
 * <h2>Direct Use</h2>
 * <p>The following shows an example of building an index directly.
 *  The "show..." methods below are just to illustrate usage.
 *
 * <pre>
 * // Create a simple index.  "Item" is assumed to be an application
 * // defined type that the application's UI and other processing knows about,
 * //  and that has a name.
 *
 * UErrorCode status = U_ZERO_ERROR;
 * AlphabeticIndex index = new AlphabeticIndex(desiredLocale, status);
 * index->addLabels(additionalLocale, status);
 * for (Item *item in some source of Items ) {
 *     index->addRecord(item->name(), item, status);
 * }
 * ...
 * // Show index at top. We could skip or gray out empty buckets
 *
 * while (index->nextBucket(status)) {
 *     if (showAll || index->getBucketRecordCount() != 0) {
 *         showLabelAtTop(UI, index->getBucketLabel());
 *     }
 * }
 *  ...
 * // Show the buckets with their contents, skipping empty buckets
 *
 * index->resetBucketIterator(status);
 * while (index->nextBucket(status)) {
 *    if (index->getBucketRecordCount() != 0) {
 *        showLabelInList(UI, index->getBucketLabel());
 *        while (index->nextRecord(status)) {
 *            showIndexedItem(UI, static_cast<Item *>(index->getRecordData()))
 * </pre>
 *
 * The caller can build different UIs using this class.
 * For example, an index character could be omitted or grayed-out
 * if its bucket is empty. Small buckets could also be combined based on size, such as:
 *
 * <pre>
 * <b>... A-F G-N O-Z ...</b>
 * </pre>
 *
 * <h2>Client Support</h2>
 * <p>Callers can also use the AlphabeticIndex::ImmutableIndex, or the AlphabeticIndex itself,
 * to support sorting on a client that doesn't support AlphabeticIndex functionality.
 *
 * <p>The ImmutableIndex is both immutable and thread-safe.
 * The corresponding AlphabeticIndex methods are not thread-safe because
 * they "lazily" build the index buckets.
 * <ul>
 * <li>ImmutableIndex.getBucket(index) provides random access to all
 *     buckets and their labels and label types.
 * <li>The AlphabeticIndex bucket iterator or ImmutableIndex.getBucket(0..getBucketCount-1)
 *     can be used to get a list of the labels,
 *     such as "...", "A", "B",..., and send that list to the client.
 * <li>When the client has a new name, it sends that name to the server.
 * The server needs to call the following methods,
 * and communicate the bucketIndex and collationKey back to the client.
 *
 * <pre>
 * int32_t bucketIndex = index.getBucketIndex(name, status);
 * const UnicodeString &label = immutableIndex.getBucket(bucketIndex)->getLabel();  // optional
 * int32_t skLength = collator.getSortKey(name, sk, skCapacity);
 * </pre>
 *
 * <li>The client would put the name (and associated information) into its bucket for bucketIndex. The sort key sk is a
 * sequence of bytes that can be compared with a binary compare, and produce the right localized result.</li>
 * </ul>
 *
 * @stable ICU 4.8
 */
class U_I18N_API AlphabeticIndex: public UObject {
public:
     /**
      * An index "bucket" with a label string and type.
      * It is referenced by getBucketIndex(),
      * and returned by ImmutableIndex.getBucket().
      *
      * The Bucket class is not intended for public subclassing.
      * @stable ICU 51
      */
     class U_I18N_API Bucket : public UObject {
     public:
        /**
         * Destructor.
         * @stable ICU 51
         */
        virtual ~Bucket();

/**
         * Returns the label string.
         *
         * @return the label string for the bucket
         * @stable ICU 51
         */
        const UnicodeString &getLabel() const { return label_; }
        /**
         * Returns whether this bucket is a normal, underflow, overflow, or inflow bucket.
         *
         * @return the bucket label type
         * @stable ICU 51
         */
        UAlphabeticIndexLabelType getLabelType() const { return labelType_; }

private:
        friend class AlphabeticIndex;
        friend class BucketList;

UnicodeString label_;
        UnicodeString lowerBoundary_;
        UAlphabeticIndexLabelType labelType_;
        Bucket *displayBucket_;
        int32_t displayIndex_;
        UVector *records_;  // Records are owned by the inputList_ vector.

Bucket(const UnicodeString &label,   // Parameter strings are copied.
               const UnicodeString &lowerBoundary,
               UAlphabeticIndexLabelType type);
     };

/**
     * Immutable, thread-safe version of AlphabeticIndex.
     * This class provides thread-safe methods for bucketing,
     * and random access to buckets and their properties,
     * but does not offer adding records to the index.
     *
     * The ImmutableIndex class is not intended for public subclassing.
     *
     * @stable ICU 51
     */
    class U_I18N_API ImmutableIndex : public UObject {
    public:
        /**
         * Destructor.
         * @stable ICU 51
         */
        virtual ~ImmutableIndex();

/**
         * Returns the number of index buckets and labels, including underflow/inflow/overflow.
         *
         * @return the number of index buckets
         * @stable ICU 51
         */
        int32_t getBucketCount() const;

/**
         * Finds the index bucket for the given name and returns the number of that bucket.
         * Use getBucket() to get the bucket's properties.
         *
         * @param name the string to be sorted into an index bucket
         * @param errorCode Error code, will be set with the reason if the
         *                  operation fails.
         * @return the bucket number for the name
         * @stable ICU 51
         */
        int32_t getBucketIndex(const UnicodeString &name, UErrorCode &errorCode) const;

/**
         * Returns the index-th bucket. Returns NULL if the index is out of range.
         *
         * @param index bucket number
         * @return the index-th bucket
         * @stable ICU 51
         */
        const Bucket *getBucket(int32_t index) const;

private:
        friend class AlphabeticIndex;

ImmutableIndex(BucketList *bucketList, Collator *collatorPrimaryOnly)
                : buckets_(bucketList), collatorPrimaryOnly_(collatorPrimaryOnly) {}

BucketList *buckets_;
        Collator *collatorPrimaryOnly_;
    };

/**
     * Construct an AlphabeticIndex object for the specified locale.  If the locale's
     * data does not include index characters, a set of them will be
     * synthesized based on the locale's exemplar characters.  The locale
     * determines the sorting order for both the index characters and the
     * user item names appearing under each Index character.
     *
     * @param locale the desired locale.
     * @param status Error code, will be set with the reason if the construction
     *               of the AlphabeticIndex object fails.
     * @stable ICU 4.8
     */
     AlphabeticIndex(const Locale &locale, UErrorCode &status);

/** 
     * Construct an AlphabeticIndex that uses a specific collator.
     * 
     * The index will be created with no labels; the addLabels() function must be called
     * after creation to add the desired labels to the index.
     * 
     * The index adopts the collator, and is responsible for deleting it. 
     * The caller should make no further use of the collator after creating the index.
     * 
     * @param collator The collator to use to order the contents of this index.
     * @param status Error code, will be set with the reason if the 
     *               operation fails.
     * @stable ICU 51
     */
    AlphabeticIndex(RuleBasedCollator *collator, UErrorCode &status);

/**
     * Add Labels to this Index.  The labels are additions to those
     * that are already in the index; they do not replace the existing
     * ones.
     * @param additions The additional characters to add to the index, such as A-Z.
     * @param status Error code, will be set with the reason if the 
     *               operation fails.
     * @return this, for chaining
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &addLabels(const UnicodeSet &additions, UErrorCode &status);

/**
     * Add the index characters from a Locale to the index.  The labels
     * are added to those that are already in the index; they do not replace the
     * existing index characters.  The collation order for this index is not
     * changed; it remains that of the locale that was originally specified
     * when creating this Index.
     *
     * @param locale The locale whose index characters are to be added.
     * @param status Error code, will be set with the reason if the 
     *               operation fails.
     * @return this, for chaining
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &addLabels(const Locale &locale, UErrorCode &status);

/**
      * Destructor
      * @stable ICU 4.8
      */
    virtual ~AlphabeticIndex();

/**
     * Builds an immutable, thread-safe version of this instance, without data records.
     *
     * @return an immutable index instance
     * @stable ICU 51
     */
    ImmutableIndex *buildImmutableIndex(UErrorCode &errorCode);

/**
     * Get the Collator that establishes the ordering of the items in this index.
     * Ownership of the collator remains with the AlphabeticIndex instance.
     *
     * The returned collator is a reference to the internal collator used by this
     * index.  It may be safely used to compare the names of items or to get
     * sort keys for names.  However if any settings need to be changed,
     * or other non-const methods called, a cloned copy must be made first.
     *
     * @return The collator
     * @stable ICU 4.8
     */
    virtual const RuleBasedCollator &getCollator() const;

/**
     * Get the default label used for abbreviated buckets *between* other index characters.
     * For example, consider the labels when Latin (X Y Z) and Greek (Α Β Γ) are used:
     *
     *     X Y Z ... Α Β Γ.
     *
     * @return inflow label
     * @stable ICU 4.8
     */
    virtual const UnicodeString &getInflowLabel() const;

/**
     * Set the default label used for abbreviated buckets <i>between</i> other index characters.
     * An inflow label will be automatically inserted if two otherwise-adjacent label characters
     * are from different scripts, e.g. Latin and Cyrillic, and a third script, e.g. Greek,
     * sorts between the two.  The default inflow character is an ellipsis (...)
     *
     * @param inflowLabel the new Inflow label.
     * @param status Error code, will be set with the reason if the operation fails.
     * @return this
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &setInflowLabel(const UnicodeString &inflowLabel, UErrorCode &status);

/**
     * Get the special label used for items that sort after the last normal label,
     * and that would not otherwise have an appropriate label.
     *
     * @return the overflow label
     * @stable ICU 4.8
     */
    virtual const UnicodeString &getOverflowLabel() const;

/**
     * Set the label used for items that sort after the last normal label,
     * and that would not otherwise have an appropriate label.
     *
     * @param overflowLabel the new overflow label.
     * @param status Error code, will be set with the reason if the operation fails.
     * @return this
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &setOverflowLabel(const UnicodeString &overflowLabel, UErrorCode &status);

/**
     * Get the special label used for items that sort before the first normal label,
     * and that would not otherwise have an appropriate label.
     *
     * @return underflow label
     * @stable ICU 4.8
     */
    virtual const UnicodeString &getUnderflowLabel() const;

/**
     * Set the label used for items that sort before the first normal label,
     * and that would not otherwise have an appropriate label.
     *
     * @param underflowLabel the new underflow label.
     * @param status Error code, will be set with the reason if the operation fails.
     * @return this
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &setUnderflowLabel(const UnicodeString &underflowLabel, UErrorCode &status);

/**
     * Get the limit on the number of labels permitted in the index.
     * The number does not include over, under and inflow labels.
     *
     * @return maxLabelCount maximum number of labels.
     * @stable ICU 4.8
     */
    virtual int32_t getMaxLabelCount() const;

/**
     * Set a limit on the number of labels permitted in the index.
     * The number does not include over, under and inflow labels.
     * Currently, if the number is exceeded, then every
     * nth item is removed to bring the count down.
     * A more sophisticated mechanism may be available in the future.
     *
     * @param maxLabelCount the maximum number of labels.
     * @param status error code
     * @return This, for chaining
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &setMaxLabelCount(int32_t maxLabelCount, UErrorCode &status);

/**
     * Add a record to the index.  Each record will be associated with an index Bucket
     *  based on the record's name.  The list of records for each bucket will be sorted
     *  based on the collation ordering of the names in the index's locale.
     *  Records with duplicate names are permitted; they will be kept in the order
     *  that they were added.
     *
     * @param name The display name for the Record.  The Record will be placed in
     *             a bucket based on this name.
     * @param data An optional pointer to user data associated with this
     *             item.  When iterating the contents of a bucket, both the
     *             data pointer the name will be available for each Record.
     * @param status  Error code, will be set with the reason if the operation fails.
     * @return        This, for chaining.
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &addRecord(const UnicodeString &name, const void *data, UErrorCode &status);

/**
     * Remove all Records from the Index.  The set of Buckets, which define the headings under
     * which records are classified, is not altered.
     *
     * @param status  Error code, will be set with the reason if the operation fails.
     * @return        This, for chaining.
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &clearRecords(UErrorCode &status);

/**  Get the number of labels in this index.
     *      Note: may trigger lazy index construction.
     *
     * @param status  Error code, will be set with the reason if the operation fails.
     * @return        The number of labels in this index, including any under, over or
     *                in-flow labels.
     * @stable ICU 4.8
     */
    virtual int32_t  getBucketCount(UErrorCode &status);

/**  Get the total number of Records in this index, that is, the number
     *   of <name, data> pairs added.
     *
     * @param status  Error code, will be set with the reason if the operation fails.
     * @return        The number of records in this index, that is, the total number
     *                of (name, data) items added with addRecord().
     * @stable ICU 4.8
     */
    virtual int32_t  getRecordCount(UErrorCode &status);

/**
     *   Given the name of a record, return the zero-based index of the Bucket
     *   in which the item should appear.  The name need not be in the index.
     *   A Record will not be added to the index by this function.
     *   Bucket numbers are zero-based, in Bucket iteration order.
     *
     * @param itemName  The name whose bucket position in the index is to be determined.
     * @param status  Error code, will be set with the reason if the operation fails.
     * @return The bucket number for this name.
     * @stable ICU 4.8
     *
     */
    virtual int32_t  getBucketIndex(const UnicodeString &itemName, UErrorCode &status);

/**
     *   Get the zero based index of the current Bucket from an iteration
     *   over the Buckets of this index.  Return -1 if no iteration is in process.
     *   @return  the index of the current Bucket
     *   @stable ICU 4.8
     */
    virtual int32_t  getBucketIndex() const;

/**
     *   Advance the iteration over the Buckets of this index.  Return FALSE if
     *   there are no more Buckets.
     *
     *   @param status  Error code, will be set with the reason if the operation fails.
     *   U_ENUM_OUT_OF_SYNC_ERROR will be reported if the index is modified while
     *   an enumeration of its contents are in process.
     *
     *   @return TRUE if success, FALSE if at end of iteration
     *   @stable ICU 4.8
     */
    virtual UBool nextBucket(UErrorCode &status);

/**
     *   Return the name of the Label of the current bucket from an iteration over the buckets.
     *   If the iteration is before the first Bucket (nextBucket() has not been called),
     *   or after the last, return an empty string.
     *
     *   @return the bucket label.
     *   @stable ICU 4.8
     */
    virtual const UnicodeString &getBucketLabel() const;

/**
     *  Return the type of the label for the current Bucket (selected by the
     *  iteration over Buckets.)
     *
     * @return the label type.
     * @stable ICU 4.8
     */
    virtual UAlphabeticIndexLabelType getBucketLabelType() const;

/**
      * Get the number of <name, data> Records in the current Bucket.
      * If the current bucket iteration position is before the first label or after the
      * last, return 0.
      *
      *  @return the number of Records.
      *  @stable ICU 4.8
      */
    virtual int32_t getBucketRecordCount() const;

/**
     *  Reset the Bucket iteration for this index.  The next call to nextBucket()
     *  will restart the iteration at the first label.
     *
     * @param status  Error code, will be set with the reason if the operation fails.
     * @return        this, for chaining.
     * @stable ICU 4.8
     */
    virtual AlphabeticIndex &resetBucketIterator(UErrorCode &status);

/**
     * Advance to the next record in the current Bucket.
     * When nextBucket() is called, Record iteration is reset to just before the
     * first Record in the new Bucket.
     *
     *   @param status  Error code, will be set with the reason if the operation fails.
     *   U_ENUM_OUT_OF_SYNC_ERROR will be reported if the index is modified while
     *   an enumeration of its contents are in process.
     *   @return TRUE if successful, FALSE when the iteration advances past the last item.
     *   @stable ICU 4.8
     */
    virtual UBool nextRecord(UErrorCode &status);

/**
     * Get the name of the current Record.
     * Return an empty string if the Record iteration position is before first
     * or after the last.
     *
     *  @return The name of the current index item.
     *  @stable ICU 4.8
     */
    virtual const UnicodeString &getRecordName() const;

/**
     * Return the data pointer of the Record currently being iterated over.
     * Return NULL if the current iteration position before the first item in this Bucket,
     * or after the last.
     *
     *  @return The current Record's data pointer.
     *  @stable ICU 4.8
     */
    virtual const void *getRecordData() const;

/**
     * Reset the Record iterator position to before the first Record in the current Bucket.
     *
     *  @return This, for chaining.
     *  @stable ICU 4.8
     */
    virtual AlphabeticIndex &resetRecordIterator();

private:
     /**
      * No Copy constructor.
      * @internal
      */
     AlphabeticIndex(const AlphabeticIndex &other);

/**
      *   No assignment.
      */
     AlphabeticIndex &operator =(const AlphabeticIndex & /*other*/) { return *this;};

/**
     * No Equality operators.
     * @internal
     */
     virtual UBool operator==(const AlphabeticIndex& other) const;

/**
     * Inequality operator.
     * @internal
     */
     virtual UBool operator!=(const AlphabeticIndex& other) const;

// Common initialization, for use from all constructors.
     void init(const Locale *locale, UErrorCode &status);

/**
     * This method is called to get the index exemplars. Normally these come from the locale directly,
     * but if they aren't available, we have to synthesize them.
     */
    void addIndexExemplars(const Locale &locale, UErrorCode &status);
    /**
     * Add Chinese index characters from the tailoring.
     */
    UBool addChineseIndexCharacters(UErrorCode &errorCode);

UVector *firstStringsInScript(UErrorCode &status);

static UnicodeString separated(const UnicodeString &item);

/**
     * Determine the best labels to use.
     * This is based on the exemplars, but we also process to make sure that they are unique,
     * and sort differently, and that the overall list is small enough.
     */
    void initLabels(UVector &indexCharacters, UErrorCode &errorCode) const;
    BucketList *createBucketList(UErrorCode &errorCode) const;
    void initBuckets(UErrorCode &errorCode);
    void clearBuckets();
    void internalResetBucketIterator();

public:

//  The Record is declared public only to allow access from
    //  implementation code written in plain C.
    //  It is not intended for public use.

#ifndef U_HIDE_INTERNAL_API
    /**
     * A (name, data) pair, to be sorted by name into one of the index buckets.
     * The user data is not used by the index implementation.
     * \cond
     * @internal
     */
    struct Record: public UMemory {
        const UnicodeString  name_;
        const void           *data_;
        Record(const UnicodeString &name, const void *data);
        ~Record();
    };
    /** \endcond */
#endif  /* U_HIDE_INTERNAL_API */

private:

/**
     * Holds all user records before they are distributed into buckets.
     * Type of contents is (Record *)
     * @internal
     */
    UVector  *inputList_;

int32_t  labelsIterIndex_;        // Index of next item to return.
    int32_t  itemsIterIndex_;
    Bucket   *currentBucket_;         // While an iteration of the index in underway,
                                      //   point to the bucket for the current label.
                                      // NULL when no iteration underway.

int32_t    maxLabelCount_;        // Limit on # of labels permitted in the index.

UnicodeSet *initialLabels_;       // Initial (unprocessed) set of Labels.  Union
                                      //   of those explicitly set by the user plus
                                      //   those from locales.  Raw values, before
                                      //   crunching into bucket labels.

UVector *firstCharsInScripts_;    // The first character from each script,
                                      //   in collation order.

RuleBasedCollator *collator_;
    RuleBasedCollator *collatorPrimaryOnly_;

// Lazy evaluated: null means that we have not built yet.
    BucketList *buckets_;

UnicodeString  inflowLabel_;
    UnicodeString  overflowLabel_;
    UnicodeString  underflowLabel_;
    UnicodeString  overflowComparisonString_;

UnicodeString emptyString_;
};

U_NAMESPACE_END

#endif  // !UCONFIG_NO_COLLATION
#endif