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: uiter.h

// © 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