FM / unicode

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

Name	Size	Mode	Actions
alphaindex.h	27056	0644	edit dl rm
appendable.h	8632	0644	edit dl rm
basictz.h	9055	0644	edit dl rm
brkiter.h	28195	0644	edit dl rm
bytestream.h	9767	0644	edit dl rm
bytestrie.h	19718	0644	edit dl rm
bytestriebuilder.h	7186	0644	edit dl rm
calendar.h	107581	0644	edit dl rm
caniter.h	7550	0644	edit dl rm
casemap.h	25871	0644	edit dl rm
char16ptr.h	7331	0644	edit dl rm
chariter.h	24573	0644	edit dl rm
choicfmt.h	24418	0644	edit dl rm
coleitr.h	14033	0644	edit dl rm
coll.h	56928	0644	edit dl rm
compactdecimalformat.h	6971	0644	edit dl rm
curramt.h	3782	0644	edit dl rm
currpinf.h	7412	0644	edit dl rm
currunit.h	3606	0644	edit dl rm
datefmt.h	41334	0644	edit dl rm
dbbi.h	1133	0644	edit dl rm
dcfmtsym.h	20584	0644	edit dl rm
decimfmt.h	88478	0644	edit dl rm
docmain.h	6878	0644	edit dl rm
dtfmtsym.h	38548	0644	edit dl rm
dtintrv.h	3848	0644	edit dl rm
dtitvfmt.h	43898	0644	edit dl rm
dtitvinf.h	18903	0644	edit dl rm
dtptngen.h	25626	0644	edit dl rm
dtrule.h	8831	0644	edit dl rm
edits.h	21169	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4894	0644	edit dl rm
fieldpos.h	8838	0644	edit dl rm
filteredbrk.h	5364	0644	edit dl rm
fmtable.h	24946	0644	edit dl rm
format.h	12741	0644	edit dl rm
fpositer.h	3047	0644	edit dl rm
gender.h	3347	0644	edit dl rm
gregocal.h	32331	0644	edit dl rm
icudataver.h	1051	0644	edit dl rm
icuplug.h	12166	0644	edit dl rm
idna.h	12938	0644	edit dl rm
listformatter.h	6331	0644	edit dl rm
localpointer.h	17284	0644	edit dl rm
locdspnm.h	7224	0644	edit dl rm
locid.h	46001	0644	edit dl rm
measfmt.h	12298	0644	edit dl rm
measunit.h	39427	0644	edit dl rm
measure.h	4361	0644	edit dl rm
messagepattern.h	34460	0644	edit dl rm
msgfmt.h	44398	0644	edit dl rm
normalizer2.h	34789	0644	edit dl rm
normlzr.h	31476	0644	edit dl rm
nounit.h	2693	0644	edit dl rm
numberformatter.h	89164	0644	edit dl rm
numberrangeformatter.h	29430	0644	edit dl rm
numfmt.h	50322	0644	edit dl rm
numsys.h	6895	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5581	0644	edit dl rm
platform.h	27754	0644	edit dl rm
plurfmt.h	25786	0644	edit dl rm
plurrule.h	17834	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6487	0644	edit dl rm
rbbi.h	27047	0644	edit dl rm
rbnf.h	50984	0644	edit dl rm
rbtz.h	15838	0644	edit dl rm
regex.h	86943	0644	edit dl rm
region.h	9342	0644	edit dl rm
reldatefmt.h	14812	0644	edit dl rm
rep.h	9726	0644	edit dl rm
resbund.h	18440	0644	edit dl rm
schriter.h	6410	0644	edit dl rm
scientificnumberformatter.h	6474	0644	edit dl rm
search.h	22742	0644	edit dl rm
selfmt.h	14579	0644	edit dl rm
simpleformatter.h	11701	0644	edit dl rm
simpletz.h	46389	0644	edit dl rm
smpdtfmt.h	72442	0644	edit dl rm
sortkey.h	11383	0644	edit dl rm
std_string.h	1015	0644	edit dl rm
strenum.h	10279	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	6610	0644	edit dl rm
stringtriebuilder.h	15636	0644	edit dl rm
stsearch.h	21801	0644	edit dl rm
symtable.h	4312	0644	edit dl rm
tblcoll.h	37272	0644	edit dl rm
timezone.h	41862	0644	edit dl rm
tmunit.h	3371	0644	edit dl rm
tmutamt.h	4918	0644	edit dl rm
tmutfmt.h	7977	0644	edit dl rm
translit.h	67339	0644	edit dl rm
tzfmt.h	43846	0644	edit dl rm
tznames.h	17190	0644	edit dl rm
tzrule.h	36170	0644	edit dl rm
tztrans.h	6214	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	56526	0644	edit dl rm
ucasemap.h	15546	0644	edit dl rm
ucat.h	5484	0644	edit dl rm
uchar.h	143314	0644	edit dl rm
ucharstrie.h	21569	0644	edit dl rm
ucharstriebuilder.h	7316	0644	edit dl rm
uchriter.h	13457	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	62864	0644	edit dl rm
ucoleitr.h	9684	0644	edit dl rm
uconfig.h	11949	0644	edit dl rm
ucpmap.h	5709	0644	edit dl rm
ucptrie.h	22824	0644	edit dl rm
ucsdet.h	15018	0644	edit dl rm
ucurr.h	15947	0644	edit dl rm
udat.h	61572	0644	edit dl rm
udata.h	15905	0644	edit dl rm
udateintervalformat.h	6950	0644	edit dl rm
udatpg.h	26664	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
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	5148	0644	edit dl rm
uloc.h	51971	0644	edit dl rm
ulocdata.h	11533	0644	edit dl rm
umachine.h	13509	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24812	0644	edit dl rm
umutablecptrie.h	8477	0644	edit dl rm
unifilt.h	3716	0644	edit dl rm
unifunct.h	4079	0644	edit dl rm
unimatch.h	6184	0644	edit dl rm
unirepl.h	3403	0644	edit dl rm
uniset.h	65796	0644	edit dl rm
unistr.h	178587	0644	edit dl rm
unorm.h	20938	0644	edit dl rm
unorm2.h	25254	0644	edit dl rm
unum.h	54666	0644	edit dl rm
unumberformatter.h	24335	0644	edit dl rm
unumsys.h	7314	0644	edit dl rm
uobject.h	10958	0644	edit dl rm
upluralrules.h	6880	0644	edit dl rm
uregex.h	73784	0644	edit dl rm
uregion.h	10073	0644	edit dl rm
ureldatefmt.h	12518	0644	edit dl rm
urename.h	130791	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37404	0644	edit dl rm
uscript.h	27153	0644	edit dl rm
usearch.h	39038	0644	edit dl rm
uset.h	40958	0644	edit dl rm
usetiter.h	9719	0644	edit dl rm
ushape.h	18432	0644	edit dl rm
uspoof.h	67613	0644	edit dl rm
usprep.h	8331	0644	edit dl rm
ustdio.h	39469	0644	edit dl rm
ustream.h	1844	0644	edit dl rm
ustring.h	74211	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59503	0644	edit dl rm
utf.h	8046	0644	edit dl rm
utf8.h	30734	0644	edit dl rm
utf16.h	22866	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	44827	0644	edit dl rm
utmscale.h	14113	0644	edit dl rm
utrace.h	14219	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31212	0644	edit dl rm
uvernum.h	6206	0644	edit dl rm
uversion.h	6865	0644	edit dl rm
vtzone.h	20651	0644	edit dl rm

Edit: /opt/alt/libicu/usr/include/unicode/uiter.h (23319B)

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
*   Copyright (C) 2002-2011 International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  uiter.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2002jan18
*   created by: Markus W. Scherer
*/

#ifndef __UITER_H__
#define __UITER_H__

/**
 * \file
 * \brief C API: Unicode Character Iteration
 *
 * @see UCharIterator
 */

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API
    U_NAMESPACE_BEGIN

class CharacterIterator;
    class Replaceable;

U_NAMESPACE_END
#endif

U_CDECL_BEGIN

struct UCharIterator;
typedef struct UCharIterator UCharIterator; /**< C typedef for struct UCharIterator. @stable ICU 2.1 */

/**
 * Origin constants for UCharIterator.getIndex() and UCharIterator.move().
 * @see UCharIteratorMove
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef enum UCharIteratorOrigin {
    UITER_START, UITER_CURRENT, UITER_LIMIT, UITER_ZERO, UITER_LENGTH
} UCharIteratorOrigin;

/** Constants for UCharIterator. @stable ICU 2.6 */
enum {
    /**
     * Constant value that may be returned by UCharIteratorMove
     * indicating that the final UTF-16 index is not known, but that the move succeeded.
     * This can occur when moving relative to limit or length, or
     * when moving relative to the current index after a setState()
     * when the current UTF-16 index is not known.
     *
     * It would be very inefficient to have to count from the beginning of the text
     * just to get the current/limit/length index after moving relative to it.
     * The actual index can be determined with getIndex(UITER_CURRENT)
     * which will count the UChars if necessary.
     *
     * @stable ICU 2.6
     */
    UITER_UNKNOWN_INDEX=-2
};

/**
 * Constant for UCharIterator getState() indicating an error or
 * an unknown state.
 * Returned by uiter_getState()/UCharIteratorGetState
 * when an error occurs.
 * Also, some UCharIterator implementations may not be able to return
 * a valid state for each position. This will be clearly documented
 * for each such iterator (none of the public ones here).
 *
 * @stable ICU 2.6
 */
#define UITER_NO_STATE ((uint32_t)0xffffffff)

/**
 * Function type declaration for UCharIterator.getIndex().
 *
 * Gets the current position, or the start or limit of the
 * iteration range.
 *
 * This function may perform slowly for UITER_CURRENT after setState() was called,
 * or for UITER_LENGTH, because an iterator implementation may have to count
 * UChars if the underlying storage is not UTF-16.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @param origin get the 0, start, limit, length, or current index
 * @return the requested index, or U_SENTINEL in an error condition
 *
 * @see UCharIteratorOrigin
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef int32_t U_CALLCONV
UCharIteratorGetIndex(UCharIterator *iter, UCharIteratorOrigin origin);

/**
 * Function type declaration for UCharIterator.move().
 *
 * Use iter->move(iter, index, UITER_ZERO) like CharacterIterator::setIndex(index).
 *
 * Moves the current position relative to the start or limit of the
 * iteration range, or relative to the current position itself.
 * The movement is expressed in numbers of code units forward
 * or backward by specifying a positive or negative delta.
 * Out of bounds movement will be pinned to the start or limit.
 *
 * This function may perform slowly for moving relative to UITER_LENGTH
 * because an iterator implementation may have to count the rest of the
 * UChars if the native storage is not UTF-16.
 *
 * When moving relative to the limit or length, or
 * relative to the current position after setState() was called,
 * move() may return UITER_UNKNOWN_INDEX (-2) to avoid an inefficient
 * determination of the actual UTF-16 index.
 * The actual index can be determined with getIndex(UITER_CURRENT)
 * which will count the UChars if necessary.
 * See UITER_UNKNOWN_INDEX for details.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @param delta can be positive, zero, or negative
 * @param origin move relative to the 0, start, limit, length, or current index
 * @return the new index, or U_SENTINEL on an error condition,
 *         or UITER_UNKNOWN_INDEX when the index is not known.
 *
 * @see UCharIteratorOrigin
 * @see UCharIterator
 * @see UITER_UNKNOWN_INDEX
 * @stable ICU 2.1
 */
typedef int32_t U_CALLCONV
UCharIteratorMove(UCharIterator *iter, int32_t delta, UCharIteratorOrigin origin);

/**
 * Function type declaration for UCharIterator.hasNext().
 *
 * Check if current() and next() can still
 * return another code unit.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return boolean value for whether current() and next() can still return another code unit
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef UBool U_CALLCONV
UCharIteratorHasNext(UCharIterator *iter);

/**
 * Function type declaration for UCharIterator.hasPrevious().
 *
 * Check if previous() can still return another code unit.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return boolean value for whether previous() can still return another code unit
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef UBool U_CALLCONV
UCharIteratorHasPrevious(UCharIterator *iter);
 
/**
 * Function type declaration for UCharIterator.current().
 *
 * Return the code unit at the current position,
 * or U_SENTINEL if there is none (index is at the limit).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the current code unit
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef UChar32 U_CALLCONV
UCharIteratorCurrent(UCharIterator *iter);

/**
 * Function type declaration for UCharIterator.next().
 *
 * Return the code unit at the current index and increment
 * the index (post-increment, like s[i++]),
 * or return U_SENTINEL if there is none (index is at the limit).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the current code unit (and post-increment the current index)
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef UChar32 U_CALLCONV
UCharIteratorNext(UCharIterator *iter);

/**
 * Function type declaration for UCharIterator.previous().
 *
 * Decrement the index and return the code unit from there
 * (pre-decrement, like s[--i]),
 * or return U_SENTINEL if there is none (index is at the start).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the previous code unit (after pre-decrementing the current index)
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef UChar32 U_CALLCONV
UCharIteratorPrevious(UCharIterator *iter);

/**
 * Function type declaration for UCharIterator.reservedFn().
 * Reserved for future use.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @param something some integer argument
 * @return some integer
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
typedef int32_t U_CALLCONV
UCharIteratorReserved(UCharIterator *iter, int32_t something);

/**
 * Function type declaration for UCharIterator.getState().
 *
 * Get the "state" of the iterator in the form of a single 32-bit word.
 * It is recommended that the state value be calculated to be as small as
 * is feasible. For strings with limited lengths, fewer than 32 bits may
 * be sufficient.
 *
 * This is used together with setState()/UCharIteratorSetState
 * to save and restore the iterator position more efficiently than with
 * getIndex()/move().
 *
 * The iterator state is defined as a uint32_t value because it is designed
 * for use in ucol_nextSortKeyPart() which provides 32 bits to store the state
 * of the character iterator.
 *
 * With some UCharIterator implementations (e.g., UTF-8),
 * getting and setting the UTF-16 index with existing functions
 * (getIndex(UITER_CURRENT) followed by move(pos, UITER_ZERO)) is possible but
 * relatively slow because the iterator has to "walk" from a known index
 * to the requested one.
 * This takes more time the farther it needs to go.
 *
 * An opaque state value allows an iterator implementation to provide
 * an internal index (UTF-8: the source byte array index) for
 * fast, constant-time restoration.
 *
 * After calling setState(), a getIndex(UITER_CURRENT) may be slow because
 * the UTF-16 index may not be restored as well, but the iterator can deliver
 * the correct text contents and move relative to the current position
 * without performance degradation.
 *
 * Some UCharIterator implementations may not be able to return
 * a valid state for each position, in which case they return UITER_NO_STATE instead.
 * This will be clearly documented for each such iterator (none of the public ones here).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the state word
 *
 * @see UCharIterator
 * @see UCharIteratorSetState
 * @see UITER_NO_STATE
 * @stable ICU 2.6
 */
typedef uint32_t U_CALLCONV
UCharIteratorGetState(const UCharIterator *iter);

/**
 * Function type declaration for UCharIterator.setState().
 *
 * Restore the "state" of the iterator using a state word from a getState() call.
 * The iterator object need not be the same one as for which getState() was called,
 * but it must be of the same type (set up using the same uiter_setXYZ function)
 * and it must iterate over the same string
 * (binary identical regardless of memory address).
 * For more about the state word see UCharIteratorGetState.
 *
 * After calling setState(), a getIndex(UITER_CURRENT) may be slow because
 * the UTF-16 index may not be restored as well, but the iterator can deliver
 * the correct text contents and move relative to the current position
 * without performance degradation.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @param state the state word from a getState() call
 *              on a same-type, same-string iterator
 * @param pErrorCode Must be a valid pointer to an error code value,
 *                   which must not indicate a failure before the function call.
 *
 * @see UCharIterator
 * @see UCharIteratorGetState
 * @stable ICU 2.6
 */
typedef void U_CALLCONV
UCharIteratorSetState(UCharIterator *iter, uint32_t state, UErrorCode *pErrorCode);

/**
 * C API for code unit iteration.
 * This can be used as a C wrapper around
 * CharacterIterator, Replaceable, or implemented using simple strings, etc.
 *
 * There are two roles for using UCharIterator:
 *
 * A "provider" sets the necessary function pointers and controls the "protected"
 * fields of the UCharIterator structure. A "provider" passes a UCharIterator
 * into C APIs that need a UCharIterator as an abstract, flexible string interface.
 *
 * Implementations of such C APIs are "callers" of UCharIterator functions;
 * they only use the "public" function pointers and never access the "protected"
 * fields directly.
 *
 * The current() and next() functions only check the current index against the
 * limit, and previous() only checks the current index against the start,
 * to see if the iterator already reached the end of the iteration range.
 *
 * The assumption - in all iterators - is that the index is moved via the API,
 * which means it won't go out of bounds, or the index is modified by
 * user code that knows enough about the iterator implementation to set valid
 * index values.
 *
 * UCharIterator functions return code unit values 0..0xffff,
 * or U_SENTINEL if the iteration bounds are reached.
 *
 * @stable ICU 2.1
 */
struct UCharIterator {
    /**
     * (protected) Pointer to string or wrapped object or similar.
     * Not used by caller.
     * @stable ICU 2.1
     */
    const void *context;

/**
     * (protected) Length of string or similar.
     * Not used by caller.
     * @stable ICU 2.1
     */
    int32_t length;

/**
     * (protected) Start index or similar.
     * Not used by caller.
     * @stable ICU 2.1
     */
    int32_t start;

/**
     * (protected) Current index or similar.
     * Not used by caller.
     * @stable ICU 2.1
     */
    int32_t index;

/**
     * (protected) Limit index or similar.
     * Not used by caller.
     * @stable ICU 2.1
     */
    int32_t limit;

/**
     * (protected) Used by UTF-8 iterators and possibly others.
     * @stable ICU 2.1
     */
    int32_t reservedField;

/**
     * (public) Returns the current position or the
     * start or limit index of the iteration range.
     *
     * @see UCharIteratorGetIndex
     * @stable ICU 2.1
     */
    UCharIteratorGetIndex *getIndex;

/**
     * (public) Moves the current position relative to the start or limit of the
     * iteration range, or relative to the current position itself.
     * The movement is expressed in numbers of code units forward
     * or backward by specifying a positive or negative delta.
     *
     * @see UCharIteratorMove
     * @stable ICU 2.1
     */
    UCharIteratorMove *move;

/**
     * (public) Check if current() and next() can still
     * return another code unit.
     *
     * @see UCharIteratorHasNext
     * @stable ICU 2.1
     */
    UCharIteratorHasNext *hasNext;

/**
     * (public) Check if previous() can still return another code unit.
     *
     * @see UCharIteratorHasPrevious
     * @stable ICU 2.1
     */
    UCharIteratorHasPrevious *hasPrevious;

/**
     * (public) Return the code unit at the current position,
     * or U_SENTINEL if there is none (index is at the limit).
     *
     * @see UCharIteratorCurrent
     * @stable ICU 2.1
     */
    UCharIteratorCurrent *current;

/**
     * (public) Return the code unit at the current index and increment
     * the index (post-increment, like s[i++]),
     * or return U_SENTINEL if there is none (index is at the limit).
     *
     * @see UCharIteratorNext
     * @stable ICU 2.1
     */
    UCharIteratorNext *next;

/**
     * (public) Decrement the index and return the code unit from there
     * (pre-decrement, like s[--i]),
     * or return U_SENTINEL if there is none (index is at the start).
     *
     * @see UCharIteratorPrevious
     * @stable ICU 2.1
     */
    UCharIteratorPrevious *previous;

/**
     * (public) Reserved for future use. Currently NULL.
     *
     * @see UCharIteratorReserved
     * @stable ICU 2.1
     */
    UCharIteratorReserved *reservedFn;

/**
     * (public) Return the state of the iterator, to be restored later with setState().
     * This function pointer is NULL if the iterator does not implement it.
     *
     * @see UCharIteratorGet
     * @stable ICU 2.6
     */
    UCharIteratorGetState *getState;

/**
     * (public) Restore the iterator state from the state word from a call
     * to getState().
     * This function pointer is NULL if the iterator does not implement it.
     *
     * @see UCharIteratorSet
     * @stable ICU 2.6
     */
    UCharIteratorSetState *setState;
};

/**
 * Helper function for UCharIterator to get the code point
 * at the current index.
 *
 * Return the code point that includes the code unit at the current position,
 * or U_SENTINEL if there is none (index is at the limit).
 * If the current code unit is a lead or trail surrogate,
 * then the following or preceding surrogate is used to form
 * the code point value.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the current code point
 *
 * @see UCharIterator
 * @see U16_GET
 * @see UnicodeString::char32At()
 * @stable ICU 2.1
 */
U_STABLE UChar32 U_EXPORT2
uiter_current32(UCharIterator *iter);

/**
 * Helper function for UCharIterator to get the next code point.
 *
 * Return the code point at the current index and increment
 * the index (post-increment, like s[i++]),
 * or return U_SENTINEL if there is none (index is at the limit).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the current code point (and post-increment the current index)
 *
 * @see UCharIterator
 * @see U16_NEXT
 * @stable ICU 2.1
 */
U_STABLE UChar32 U_EXPORT2
uiter_next32(UCharIterator *iter);

/**
 * Helper function for UCharIterator to get the previous code point.
 *
 * Decrement the index and return the code point from there
 * (pre-decrement, like s[--i]),
 * or return U_SENTINEL if there is none (index is at the start).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the previous code point (after pre-decrementing the current index)
 *
 * @see UCharIterator
 * @see U16_PREV
 * @stable ICU 2.1
 */
U_STABLE UChar32 U_EXPORT2
uiter_previous32(UCharIterator *iter);

/**
 * Get the "state" of the iterator in the form of a single 32-bit word.
 * This is a convenience function that calls iter->getState(iter)
 * if iter->getState is not NULL;
 * if it is NULL or any other error occurs, then UITER_NO_STATE is returned.
 *
 * Some UCharIterator implementations may not be able to return
 * a valid state for each position, in which case they return UITER_NO_STATE instead.
 * This will be clearly documented for each such iterator (none of the public ones here).
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @return the state word
 *
 * @see UCharIterator
 * @see UCharIteratorGetState
 * @see UITER_NO_STATE
 * @stable ICU 2.6
 */
U_STABLE uint32_t U_EXPORT2
uiter_getState(const UCharIterator *iter);

/**
 * Restore the "state" of the iterator using a state word from a getState() call.
 * This is a convenience function that calls iter->setState(iter, state, pErrorCode)
 * if iter->setState is not NULL; if it is NULL, then U_UNSUPPORTED_ERROR is set.
 *
 * @param iter the UCharIterator structure ("this pointer")
 * @param state the state word from a getState() call
 *              on a same-type, same-string iterator
 * @param pErrorCode Must be a valid pointer to an error code value,
 *                   which must not indicate a failure before the function call.
 *
 * @see UCharIterator
 * @see UCharIteratorSetState
 * @stable ICU 2.6
 */
U_STABLE void U_EXPORT2
uiter_setState(UCharIterator *iter, uint32_t state, UErrorCode *pErrorCode);

/**
 * Set up a UCharIterator to iterate over a string.
 *
 * Sets the UCharIterator function pointers for iteration over the string s
 * with iteration boundaries start=index=0 and length=limit=string length.
 * The "provider" may set the start, index, and limit values at any time
 * within the range 0..length.
 * The length field will be ignored.
 *
 * The string pointer s is set into UCharIterator.context without copying
 * or reallocating the string contents.
 *
 * getState() simply returns the current index.
 * move() will always return the final index.
 *
 * @param iter UCharIterator structure to be set for iteration
 * @param s String to iterate over
 * @param length Length of s, or -1 if NUL-terminated
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
U_STABLE void U_EXPORT2
uiter_setString(UCharIterator *iter, const UChar *s, int32_t length);

/**
 * Set up a UCharIterator to iterate over a UTF-16BE string
 * (byte vector with a big-endian pair of bytes per UChar).
 *
 * Everything works just like with a normal UChar iterator (uiter_setString),
 * except that UChars are assembled from byte pairs,
 * and that the length argument here indicates an even number of bytes.
 *
 * getState() simply returns the current index.
 * move() will always return the final index.
 *
 * @param iter UCharIterator structure to be set for iteration
 * @param s UTF-16BE string to iterate over
 * @param length Length of s as an even number of bytes, or -1 if NUL-terminated
 *               (NUL means pair of 0 bytes at even index from s)
 *
 * @see UCharIterator
 * @see uiter_setString
 * @stable ICU 2.6
 */
U_STABLE void U_EXPORT2
uiter_setUTF16BE(UCharIterator *iter, const char *s, int32_t length);

/**
 * Set up a UCharIterator to iterate over a UTF-8 string.
 *
 * Sets the UCharIterator function pointers for iteration over the UTF-8 string s
 * with UTF-8 iteration boundaries 0 and length.
 * The implementation counts the UTF-16 index on the fly and
 * lazily evaluates the UTF-16 length of the text.
 *
 * The start field is used as the UTF-8 offset, the limit field as the UTF-8 length.
 * When the reservedField is not 0, then it contains a supplementary code point
 * and the UTF-16 index is between the two corresponding surrogates.
 * At that point, the UTF-8 index is behind that code point.
 *
 * The UTF-8 string pointer s is set into UCharIterator.context without copying
 * or reallocating the string contents.
 *
 * getState() returns a state value consisting of
 * - the current UTF-8 source byte index (bits 31..1)
 * - a flag (bit 0) that indicates whether the UChar position is in the middle
 *   of a surrogate pair
 *   (from a 4-byte UTF-8 sequence for the corresponding supplementary code point)
 *
 * getState() cannot also encode the UTF-16 index in the state value.
 * move(relative to limit or length), or
 * move(relative to current) after setState(), may return UITER_UNKNOWN_INDEX.
 *
 * @param iter UCharIterator structure to be set for iteration
 * @param s UTF-8 string to iterate over
 * @param length Length of s in bytes, or -1 if NUL-terminated
 *
 * @see UCharIterator
 * @stable ICU 2.6
 */
U_STABLE void U_EXPORT2
uiter_setUTF8(UCharIterator *iter, const char *s, int32_t length);

#if U_SHOW_CPLUSPLUS_API

/**
 * Set up a UCharIterator to wrap around a C++ CharacterIterator.
 *
 * Sets the UCharIterator function pointers for iteration using the
 * CharacterIterator charIter.
 *
 * The CharacterIterator pointer charIter is set into UCharIterator.context
 * without copying or cloning the CharacterIterator object.
 * The other "protected" UCharIterator fields are set to 0 and will be ignored.
 * The iteration index and boundaries are controlled by the CharacterIterator.
 *
 * getState() simply returns the current index.
 * move() will always return the final index.
 *
 * @param iter UCharIterator structure to be set for iteration
 * @param charIter CharacterIterator to wrap
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
U_STABLE void U_EXPORT2
uiter_setCharacterIterator(UCharIterator *iter, icu::CharacterIterator *charIter);

/**
 * Set up a UCharIterator to iterate over a C++ Replaceable.
 *
 * Sets the UCharIterator function pointers for iteration over the
 * Replaceable rep with iteration boundaries start=index=0 and
 * length=limit=rep->length().
 * The "provider" may set the start, index, and limit values at any time
 * within the range 0..length=rep->length().
 * The length field will be ignored.
 *
 * The Replaceable pointer rep is set into UCharIterator.context without copying
 * or cloning/reallocating the Replaceable object.
 *
 * getState() simply returns the current index.
 * move() will always return the final index.
 *
 * @param iter UCharIterator structure to be set for iteration
 * @param rep Replaceable to iterate over
 *
 * @see UCharIterator
 * @stable ICU 2.1
 */
U_STABLE void U_EXPORT2
uiter_setReplaceable(UCharIterator *iter, const icu::Replaceable *rep);

#endif

U_CDECL_END

#endif

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