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ðŸ“„ alphaindex.h(26.48 KB)
ðŸ“„ appendable.h(8.49 KB)
ðŸ“„ basictz.h(9.15 KB)
ðŸ“„ brkiter.h(27.8 KB)
ðŸ“„ bytestream.h(9.6 KB)
ðŸ“„ bytestrie.h(20.77 KB)
ðŸ“„ bytestriebuilder.h(7.08 KB)
ðŸ“„ calendar.h(105.74 KB)
ðŸ“„ caniter.h(7.43 KB)
ðŸ“„ casemap.h(25.33 KB)
ðŸ“„ char16ptr.h(7.22 KB)
ðŸ“„ chariter.h(24.05 KB)
ðŸ“„ choicfmt.h(23.91 KB)
ðŸ“„ coleitr.h(13.76 KB)
ðŸ“„ coll.h(56.23 KB)
ðŸ“„ compactdecimalformat.h(6.88 KB)
ðŸ“„ curramt.h(3.76 KB)
ðŸ“„ currpinf.h(7.3 KB)
ðŸ“„ currunit.h(4.05 KB)
ðŸ“„ datefmt.h(40.67 KB)
ðŸ“„ dbbi.h(1.19 KB)
ðŸ“„ dcfmtsym.h(20.13 KB)
ðŸ“„ decimfmt.h(87.38 KB)
ðŸ“„ docmain.h(6.97 KB)
ðŸ“„ dtfmtsym.h(37.7 KB)
ðŸ“„ dtintrv.h(3.84 KB)
ðŸ“„ dtitvfmt.h(46.63 KB)
ðŸ“„ dtitvinf.h(18.51 KB)
ðŸ“„ dtptngen.h(25.08 KB)
ðŸ“„ dtrule.h(8.68 KB)
ðŸ“„ edits.h(20.74 KB)
ðŸ“„ enumset.h(2.08 KB)
ðŸ“„ errorcode.h(4.84 KB)
ðŸ“„ fieldpos.h(8.69 KB)
ðŸ“„ filteredbrk.h(5.37 KB)
ðŸ“„ fmtable.h(24.42 KB)
ðŸ“„ format.h(12.5 KB)
ðŸ“„ formattedvalue.h(10.27 KB)
ðŸ“„ fpositer.h(3.04 KB)
ðŸ“„ gender.h(3.33 KB)
ðŸ“„ gregocal.h(31.71 KB)
ðŸ“„ icudataver.h(1.03 KB)
ðŸ“„ icuplug.h(11.88 KB)
ðŸ“„ idna.h(12.7 KB)
ðŸ“„ listformatter.h(9.47 KB)
ðŸ“„ localebuilder.h(11.27 KB)
ðŸ“„ localematcher.h(22.5 KB)
ðŸ“„ localpointer.h(19.69 KB)
ðŸ“„ locdspnm.h(7.12 KB)
ðŸ“„ locid.h(47.4 KB)
ðŸ“„ measfmt.h(11.33 KB)
ðŸ“„ measunit.h(93.31 KB)
ðŸ“„ measure.h(4.32 KB)
ðŸ“„ messagepattern.h(33.71 KB)
ðŸ“„ msgfmt.h(44.11 KB)
ðŸ“„ normalizer2.h(34.03 KB)
ðŸ“„ normlzr.h(30.94 KB)
ðŸ“„ nounit.h(2.69 KB)
ðŸ“„ numberformatter.h(86.31 KB)
ðŸ“„ numberrangeformatter.h(30.14 KB)
ðŸ“„ numfmt.h(49.81 KB)
ðŸ“„ numsys.h(7.19 KB)
ðŸ“„ parseerr.h(3.08 KB)
ðŸ“„ parsepos.h(5.56 KB)
ðŸ“„ platform.h(28.08 KB)
ðŸ“„ plurfmt.h(25.2 KB)
ðŸ“„ plurrule.h(18.39 KB)
ðŸ“„ ptypes.h(3.49 KB)
ðŸ“„ putil.h(6.33 KB)
ðŸ“„ rbbi.h(26.58 KB)
ðŸ“„ rbnf.h(48.73 KB)
ðŸ“„ rbtz.h(15.6 KB)
ðŸ“„ regex.h(84.36 KB)
ðŸ“„ region.h(9.18 KB)
ðŸ“„ reldatefmt.h(22.62 KB)
ðŸ“„ rep.h(9.37 KB)
ðŸ“„ resbund.h(18.07 KB)
ðŸ“„ schriter.h(6.32 KB)
ðŸ“„ scientificnumberformatter.h(6.4 KB)
ðŸ“„ search.h(22.22 KB)
ðŸ“„ selfmt.h(14.3 KB)
ðŸ“„ simpleformatter.h(12.59 KB)
ðŸ“„ simpletz.h(45.44 KB)
ðŸ“„ smpdtfmt.h(70.97 KB)
ðŸ“„ sortkey.h(11.18 KB)
ðŸ“„ std_string.h(1.05 KB)
ðŸ“„ strenum.h(9.92 KB)
ðŸ“„ stringoptions.h(5.79 KB)
ðŸ“„ stringpiece.h(7.38 KB)
ðŸ“„ stringtriebuilder.h(15.33 KB)
ðŸ“„ stsearch.h(21.3 KB)
ðŸ“„ symtable.h(4.27 KB)
ðŸ“„ tblcoll.h(36.61 KB)
ðŸ“„ timezone.h(41.02 KB)
ðŸ“„ tmunit.h(3.38 KB)
ðŸ“„ tmutamt.h(4.9 KB)
ðŸ“„ tmutfmt.h(7.85 KB)
ðŸ“„ translit.h(65.82 KB)
ðŸ“„ tzfmt.h(42.89 KB)
ðŸ“„ tznames.h(16.85 KB)
ðŸ“„ tzrule.h(35.37 KB)
ðŸ“„ tztrans.h(6.12 KB)
ðŸ“„ ubidi.h(89.56 KB)
ðŸ“„ ubiditransform.h(12.65 KB)
ðŸ“„ ubrk.h(23.97 KB)
ðŸ“„ ucal.h(56.9 KB)
ðŸ“„ ucasemap.h(15.18 KB)
ðŸ“„ ucat.h(5.36 KB)
ðŸ“„ uchar.h(140.56 KB)
ðŸ“„ ucharstrie.h(22.58 KB)
ðŸ“„ ucharstriebuilder.h(7.21 KB)
ðŸ“„ uchriter.h(13.2 KB)
ðŸ“„ uclean.h(11.21 KB)
ðŸ“„ ucnv.h(83.09 KB)
ðŸ“„ ucnv_cb.h(6.59 KB)
ðŸ“„ ucnv_err.h(20.99 KB)
ðŸ“„ ucnvsel.h(6.14 KB)
ðŸ“„ ucol.h(61.46 KB)
ðŸ“„ ucoleitr.h(9.46 KB)
ðŸ“„ uconfig.h(12.07 KB)
ðŸ“„ ucpmap.h(5.53 KB)
ðŸ“„ ucptrie.h(22.46 KB)
ðŸ“„ ucsdet.h(14.67 KB)
ðŸ“„ ucurr.h(16.12 KB)
ðŸ“„ udat.h(60.88 KB)
ðŸ“„ udata.h(15.56 KB)
ðŸ“„ udateintervalformat.h(10.03 KB)
ðŸ“„ udatpg.h(26.01 KB)
ðŸ“„ udisplaycontext.h(5.89 KB)
ðŸ“„ uenum.h(7.78 KB)
ðŸ“„ ufieldpositer.h(4.36 KB)
ðŸ“„ uformattable.h(10.94 KB)
ðŸ“„ uformattedvalue.h(12.14 KB)
ðŸ“„ ugender.h(2 KB)
ðŸ“„ uidna.h(33.37 KB)
ðŸ“„ uiter.h(22.77 KB)
ðŸ“„ uldnames.h(10.45 KB)
ðŸ“„ ulistformatter.h(8.83 KB)
ðŸ“„ uloc.h(52.54 KB)
ðŸ“„ ulocdata.h(11.26 KB)
ðŸ“„ umachine.h(14.53 KB)
ðŸ“„ umisc.h(1.33 KB)
ðŸ“„ umsg.h(24.23 KB)
ðŸ“„ umutablecptrie.h(8.24 KB)
ðŸ“„ unifilt.h(3.96 KB)
ðŸ“„ unifunct.h(4.04 KB)
ðŸ“„ unimatch.h(6.1 KB)
ðŸ“„ unirepl.h(3.38 KB)
ðŸ“„ uniset.h(64.9 KB)
ðŸ“„ unistr.h(170.43 KB)
ðŸ“„ unorm.h(20.52 KB)
ðŸ“„ unorm2.h(24.66 KB)
ðŸ“„ unum.h(53.62 KB)
ðŸ“„ unumberformatter.h(25.36 KB)
ðŸ“„ unumsys.h(7.21 KB)
ðŸ“„ uobject.h(10.68 KB)
ðŸ“„ upluralrules.h(7.88 KB)
ðŸ“„ uregex.h(72.05 KB)
ðŸ“„ uregion.h(9.84 KB)
ðŸ“„ ureldatefmt.h(17.26 KB)
ðŸ“„ urename.h(130.97 KB)
ðŸ“„ urep.h(5.38 KB)
ðŸ“„ ures.h(36.54 KB)
ðŸ“„ uscript.h(26.87 KB)
ðŸ“„ usearch.h(38.12 KB)
ðŸ“„ uset.h(40 KB)
ðŸ“„ usetiter.h(9.55 KB)
ðŸ“„ ushape.h(18 KB)
ðŸ“„ uspoof.h(65.9 KB)
ðŸ“„ usprep.h(8.14 KB)
ðŸ“„ ustdio.h(38.54 KB)
ðŸ“„ ustream.h(1.89 KB)
ðŸ“„ ustring.h(72.47 KB)
ðŸ“„ ustringtrie.h(3.15 KB)
ðŸ“„ utext.h(58.13 KB)
ðŸ“„ utf.h(7.86 KB)
ðŸ“„ utf16.h(23.32 KB)
ðŸ“„ utf32.h(763 B)
ðŸ“„ utf8.h(30.96 KB)
ðŸ“„ utf_old.h(45.83 KB)
ðŸ“„ utmscale.h(13.78 KB)
ðŸ“„ utrace.h(15.73 KB)
ðŸ“„ utrans.h(25.52 KB)
ðŸ“„ utypes.h(30.74 KB)
ðŸ“„ uvernum.h(6.67 KB)
ðŸ“„ uversion.h(6 KB)
ðŸ“„ vtzone.h(20.3 KB)

Editing: chariter.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************
*
*   Copyright (C) 1997-2011, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
********************************************************************
*/

#ifndef CHARITER_H
#define CHARITER_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/uobject.h"
#include "unicode/unistr.h"
/**
 * \file
 * \brief C++ API: Character Iterator
 */
 
U_NAMESPACE_BEGIN
/**
 * Abstract class that defines an API for forward-only iteration
 * on text objects.
 * This is a minimal interface for iteration without random access
 * or backwards iteration. It is especially useful for wrapping
 * streams with converters into an object for collation or
 * normalization.
 *
 * Characters can be accessed in two ways: as code units or as
 * code points.
 * Unicode code points are 21-bit integers and are the scalar values
 * of Unicode characters. ICU uses the type UChar32 for them.
 * Unicode code units are the storage units of a given
 * Unicode/UCS Transformation Format (a character encoding scheme).
 * With UTF-16, all code points can be represented with either one
 * or two code units ("surrogates").
 * String storage is typically based on code units, while properties
 * of characters are typically determined using code point values.
 * Some processes may be designed to work with sequences of code units,
 * or it may be known that all characters that are important to an
 * algorithm can be represented with single code units.
 * Other processes will need to use the code point access functions.
 *
 * ForwardCharacterIterator provides nextPostInc() to access
 * a code unit and advance an internal position into the text object,
 * similar to a <code>return text[position++]</code>. 
 * It provides next32PostInc() to access a code point and advance an internal
 * position.
 *
 * next32PostInc() assumes that the current position is that of
 * the beginning of a code point, i.e., of its first code unit.
 * After next32PostInc(), this will be true again.
 * In general, access to code units and code points in the same
 * iteration loop should not be mixed. In UTF-16, if the current position
 * is on a second code unit (Low Surrogate), then only that code unit
 * is returned even by next32PostInc().
 *
 * For iteration with either function, there are two ways to
 * check for the end of the iteration. When there are no more
 * characters in the text object:
 * <ul>
 * <li>The hasNext() function returns FALSE.</li>
 * <li>nextPostInc() and next32PostInc() return DONE
 * when one attempts to read beyond the end of the text object.</li>
 * </ul>
 *
 * Example:
 * \code 
 * void function1(ForwardCharacterIterator &it) {
 * UChar32 c;
 * while(it.hasNext()) {
 * c=it.next32PostInc();
 * // use c
 * }
 * }
 *
 * void function1(ForwardCharacterIterator &it) {
 * char16_t c;
 * while((c=it.nextPostInc())!=ForwardCharacterIterator::DONE) {
 * // use c
 * }
 * }
 * \endcode
 * 
 *
 * @stable ICU 2.0
 */
class U_COMMON_API ForwardCharacterIterator : public UObject {
public:
 /**
 * Value returned by most of ForwardCharacterIterator's functions
 * when the iterator has reached the limits of its iteration.
 * @stable ICU 2.0
 */
 enum { DONE = 0xffff };
 
 /**
 * Destructor. 
 * @stable ICU 2.0
 */
 virtual ~ForwardCharacterIterator();
 
 /**
 * Returns true when both iterators refer to the same
 * character in the same character-storage object. 
 * @param that The ForwardCharacterIterator to be compared for equality
 * @return true when both iterators refer to the same
 * character in the same character-storage object
 * @stable ICU 2.0
 */
 virtual UBool operator==(const ForwardCharacterIterator& that) const = 0;
 
 /**
 * Returns true when the iterators refer to different
 * text-storage objects, or to different characters in the
 * same text-storage object. 
 * @param that The ForwardCharacterIterator to be compared for inequality
 * @return true when the iterators refer to different
 * text-storage objects, or to different characters in the
 * same text-storage object
 * @stable ICU 2.0
 */
 inline UBool operator!=(const ForwardCharacterIterator& that) const;
 
 /**
 * Generates a hash code for this iterator. 
 * @return the hash code.
 * @stable ICU 2.0
 */
 virtual int32_t hashCode(void) const = 0;
 
 /**
 * Returns a UClassID for this ForwardCharacterIterator ("poor man's
 * RTTI"). Despite the fact that this function is public,
 * DO NOT CONSIDER IT PART OF CHARACTERITERATOR'S API! 
 * @return a UClassID for this ForwardCharacterIterator 
 * @stable ICU 2.0
 */
 virtual UClassID getDynamicClassID(void) const = 0;
 
 /**
 * Gets the current code unit for returning and advances to the next code unit
 * in the iteration range
 * (toward endIndex()). If there are
 * no more code units to return, returns DONE.
 * @return the current code unit.
 * @stable ICU 2.0
 */
 virtual char16_t nextPostInc(void) = 0;
 
 /**
 * Gets the current code point for returning and advances to the next code point
 * in the iteration range
 * (toward endIndex()). If there are
 * no more code points to return, returns DONE.
 * @return the current code point.
 * @stable ICU 2.0
 */
 virtual UChar32 next32PostInc(void) = 0;
 
 /**
 * Returns FALSE if there are no more code units or code points
 * at or after the current position in the iteration range.
 * This is used with nextPostInc() or next32PostInc() in forward
 * iteration.
 * @returns FALSE if there are no more code units or code points
 * at or after the current position in the iteration range.
 * @stable ICU 2.0
 */
 virtual UBool hasNext() = 0;
 
protected:
 /** Default constructor to be overridden in the implementing class. @stable ICU 2.0*/
 ForwardCharacterIterator();
 
 /** Copy constructor to be overridden in the implementing class. @stable ICU 2.0*/
 ForwardCharacterIterator(const ForwardCharacterIterator &other);
 
 /**
 * Assignment operator to be overridden in the implementing class.
 * @stable ICU 2.0
 */
 ForwardCharacterIterator &operator=(const ForwardCharacterIterator&) { return *this; }
};

/**
 * Abstract class that defines an API for iteration
 * on text objects.
 * This is an interface for forward and backward iteration
 * and random access into a text object.
 *
 * The API provides backward compatibility to the Java and older ICU
 * CharacterIterator classes but extends them significantly:
 * <ol>
 * <li>CharacterIterator is now a subclass of ForwardCharacterIterator.</li>
 * <li>While the old API functions provided forward iteration with
 * "pre-increment" semantics, the new one also provides functions
 * with "post-increment" semantics. They are more efficient and should
 * be the preferred iterator functions for new implementations.
 * The backward iteration always had "pre-decrement" semantics, which
 * are efficient.</li>
 * <li>Just like ForwardCharacterIterator, it provides access to
 * both code units and code points. Code point access versions are available
 * for the old and the new iteration semantics.</li>
 * <li>There are new functions for setting and moving the current position
 * without returning a character, for efficiency.</li>
 * </ol>
 *
 * See ForwardCharacterIterator for examples for using the new forward iteration
 * functions. For backward iteration, there is also a hasPrevious() function
 * that can be used analogously to hasNext().
 * The old functions work as before and are shown below.
 *
 * Examples for some of the new functions:
 *
 * Forward iteration with hasNext():
 * \code
 * void forward1(CharacterIterator &it) {
 * UChar32 c;
 * for(it.setToStart(); it.hasNext();) {
 * c=it.next32PostInc();
 * // use c
 * }
 * }
 * \endcode
 * Forward iteration more similar to loops with the old forward iteration,
 * showing a way to convert simple for() loops:
 * \code
 * void forward2(CharacterIterator &it) {
 * char16_t c;
 * for(c=it.firstPostInc(); c!=CharacterIterator::DONE; c=it.nextPostInc()) {
 * // use c
 * }
 * }
 * \endcode
 * Backward iteration with setToEnd() and hasPrevious():
 * \code
 * void backward1(CharacterIterator &it) {
 * UChar32 c;
 * for(it.setToEnd(); it.hasPrevious();) {
 * c=it.previous32();
 * // use c
 * }
 * }
 * \endcode
 * Backward iteration with a more traditional for() loop:
 * \code
 * void backward2(CharacterIterator &it) {
 * char16_t c;
 * for(c=it.last(); c!=CharacterIterator::DONE; c=it.previous()) {
 * // use c
 * }
 * }
 * \endcode
 *
 * Example for random access:
 * \code
 * void random(CharacterIterator &it) {
 * // set to the third code point from the beginning
 * it.move32(3, CharacterIterator::kStart);
 * // get a code point from here without moving the position
 * UChar32 c=it.current32();
 * // get the position
 * int32_t pos=it.getIndex();
 * // get the previous code unit
 * char16_t u=it.previous();
 * // move back one more code unit
 * it.move(-1, CharacterIterator::kCurrent);
 * // set the position back to where it was
 * // and read the same code point c and move beyond it
 * it.setIndex(pos);
 * if(c!=it.next32PostInc()) {
 * exit(1); // CharacterIterator inconsistent
 * }
 * }
 * \endcode
 *
 * Examples, especially for the old API:
 *
 * Function processing characters, in this example simple output
 * <pre>
 * \code
 * void processChar( char16_t c )
 * {
 * cout << " " << c;
 * }
 * \endcode
 * </pre>
 * Traverse the text from start to finish
 * <pre> 
 * \code
 * void traverseForward(CharacterIterator& iter)
 * {
 * for(char16_t c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
 * processChar(c);
 * }
 * }
 * \endcode
 * </pre>
 * Traverse the text backwards, from end to start
 * <pre>
 * \code
 * void traverseBackward(CharacterIterator& iter)
 * {
 * for(char16_t c = iter.last(); c != CharacterIterator.DONE; c = iter.previous()) {
 * processChar(c);
 * }
 * }
 * \endcode
 * </pre>
 * Traverse both forward and backward from a given position in the text. 
 * Calls to notBoundary() in this example represents some additional stopping criteria.
 * <pre>
 * \code
 * void traverseOut(CharacterIterator& iter, int32_t pos)
 * {
 * char16_t c;
 * for (c = iter.setIndex(pos);
 * c != CharacterIterator.DONE && (Unicode::isLetter(c) || Unicode::isDigit(c));
 * c = iter.next()) {}
 * int32_t end = iter.getIndex();
 * for (c = iter.setIndex(pos);
 * c != CharacterIterator.DONE && (Unicode::isLetter(c) || Unicode::isDigit(c));
 * c = iter.previous()) {}
 * int32_t start = iter.getIndex() + 1;
 * 
 * cout << "start: " << start << " end: " << end << endl;
 * for (c = iter.setIndex(start); iter.getIndex() < end; c = iter.next() ) {
 * processChar(c);
 * }
 * }
 * \endcode
 * </pre>
 * Creating a StringCharacterIterator and calling the test functions
 * <pre>
 * \code
 * void CharacterIterator_Example( void )
 * {
 * cout << endl << "===== CharacterIterator_Example: =====" << endl;
 * UnicodeString text("Ein kleiner Satz.");
 * StringCharacterIterator iterator(text);
 * cout << "----- traverseForward: -----------" << endl;
 * traverseForward( iterator );
 * cout << endl << endl << "----- traverseBackward: ----------" << endl;
 * traverseBackward( iterator );
 * cout << endl << endl << "----- traverseOut: ---------------" << endl;
 * traverseOut( iterator, 7 );
 * cout << endl << endl << "-----" << endl;
 * }
 * \endcode
 * </pre>
 *
 * @stable ICU 2.0
 */
class U_COMMON_API CharacterIterator : public ForwardCharacterIterator {
public:
 /**
 * Origin enumeration for the move() and move32() functions.
 * @stable ICU 2.0
 */
 enum EOrigin { kStart, kCurrent, kEnd };

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

/**
     * Returns a pointer to a new CharacterIterator of the same
     * concrete class as this one, and referring to the same
     * character in the same text-storage object as this one.  The
     * caller is responsible for deleting the new clone.  
     * @return a pointer to a new CharacterIterator
     * @stable ICU 2.0
     */
    virtual CharacterIterator* clone() const = 0;

/**
     * Sets the iterator to refer to the first code unit in its
     * iteration range, and returns that code unit.
     * This can be used to begin an iteration with next().
     * @return the first code unit in its iteration range.
     * @stable ICU 2.0
     */
    virtual char16_t         first(void) = 0;

/**
     * Sets the iterator to refer to the first code unit in its
     * iteration range, returns that code unit, and moves the position
     * to the second code unit. This is an alternative to setToStart()
     * for forward iteration with nextPostInc().
     * @return the first code unit in its iteration range.
     * @stable ICU 2.0
     */
    virtual char16_t         firstPostInc(void);

/**
     * Sets the iterator to refer to the first code point in its
     * iteration range, and returns that code unit,
     * This can be used to begin an iteration with next32().
     * Note that an iteration with next32PostInc(), beginning with,
     * e.g., setToStart() or firstPostInc(), is more efficient.
     * @return the first code point in its iteration range.
     * @stable ICU 2.0
     */
    virtual UChar32       first32(void) = 0;

/**
     * Sets the iterator to refer to the first code point in its
     * iteration range, returns that code point, and moves the position
     * to the second code point. This is an alternative to setToStart()
     * for forward iteration with next32PostInc().
     * @return the first code point in its iteration range.
     * @stable ICU 2.0
     */
    virtual UChar32       first32PostInc(void);

/**
     * Sets the iterator to refer to the first code unit or code point in its
     * iteration range. This can be used to begin a forward
     * iteration with nextPostInc() or next32PostInc().
     * @return the start position of the iteration range
     * @stable ICU 2.0
     */
    inline int32_t    setToStart();

/**
     * Sets the iterator to refer to the last code unit in its
     * iteration range, and returns that code unit.
     * This can be used to begin an iteration with previous().
     * @return the last code unit.
     * @stable ICU 2.0
     */
    virtual char16_t         last(void) = 0;
        
    /**
     * Sets the iterator to refer to the last code point in its
     * iteration range, and returns that code unit.
     * This can be used to begin an iteration with previous32().
     * @return the last code point.
     * @stable ICU 2.0
     */
    virtual UChar32       last32(void) = 0;

/**
     * Sets the iterator to the end of its iteration range, just behind
     * the last code unit or code point. This can be used to begin a backward
     * iteration with previous() or previous32().
     * @return the end position of the iteration range
     * @stable ICU 2.0
     */
    inline int32_t    setToEnd();

/**
     * Sets the iterator to refer to the "position"-th code unit
     * in the text-storage object the iterator refers to, and
     * returns that code unit.  
     * @param position the "position"-th code unit in the text-storage object
     * @return the "position"-th code unit.
     * @stable ICU 2.0
     */
    virtual char16_t         setIndex(int32_t position) = 0;

/**
     * Sets the iterator to refer to the beginning of the code point
     * that contains the "position"-th code unit
     * in the text-storage object the iterator refers to, and
     * returns that code point.
     * The current position is adjusted to the beginning of the code point
     * (its first code unit).
     * @param position the "position"-th code unit in the text-storage object
     * @return the "position"-th code point.
     * @stable ICU 2.0
     */
    virtual UChar32       setIndex32(int32_t position) = 0;

/**
     * Returns the code unit the iterator currently refers to. 
     * @return the current code unit. 
     * @stable ICU 2.0
     */
    virtual char16_t         current(void) const = 0;
        
    /**
     * Returns the code point the iterator currently refers to.  
     * @return the current code point.
     * @stable ICU 2.0
     */
    virtual UChar32       current32(void) const = 0;
        
    /**
     * Advances to the next code unit in the iteration range
     * (toward endIndex()), and returns that code unit.  If there are
     * no more code units to return, returns DONE.
     * @return the next code unit.
     * @stable ICU 2.0
     */
    virtual char16_t         next(void) = 0;
        
    /**
     * Advances to the next code point in the iteration range
     * (toward endIndex()), and returns that code point.  If there are
     * no more code points to return, returns DONE.
     * Note that iteration with "pre-increment" semantics is less
     * efficient than iteration with "post-increment" semantics
     * that is provided by next32PostInc().
     * @return the next code point.
     * @stable ICU 2.0
     */
    virtual UChar32       next32(void) = 0;
        
    /**
     * Advances to the previous code unit in the iteration range
     * (toward startIndex()), and returns that code unit.  If there are
     * no more code units to return, returns DONE.  
     * @return the previous code unit.
     * @stable ICU 2.0
     */
    virtual char16_t         previous(void) = 0;

/**
     * Advances to the previous code point in the iteration range
     * (toward startIndex()), and returns that code point.  If there are
     * no more code points to return, returns DONE. 
     * @return the previous code point. 
     * @stable ICU 2.0
     */
    virtual UChar32       previous32(void) = 0;

/**
     * Returns FALSE if there are no more code units or code points
     * before the current position in the iteration range.
     * This is used with previous() or previous32() in backward
     * iteration.
     * @return FALSE if there are no more code units or code points
     * before the current position in the iteration range, return TRUE otherwise.
     * @stable ICU 2.0
     */
    virtual UBool        hasPrevious() = 0;

/**
     * Returns the numeric index in the underlying text-storage
     * object of the character returned by first().  Since it's
     * possible to create an iterator that iterates across only
     * part of a text-storage object, this number isn't
     * necessarily 0.  
     * @returns the numeric index in the underlying text-storage
     * object of the character returned by first().
     * @stable ICU 2.0
     */
    inline int32_t       startIndex(void) const;
        
    /**
     * Returns the numeric index in the underlying text-storage
     * object of the position immediately BEYOND the character
     * returned by last().  
     * @return the numeric index in the underlying text-storage
     * object of the position immediately BEYOND the character
     * returned by last().
     * @stable ICU 2.0
     */
    inline int32_t       endIndex(void) const;
        
    /**
     * Returns the numeric index in the underlying text-storage
     * object of the character the iterator currently refers to
     * (i.e., the character returned by current()).  
     * @return the numeric index in the text-storage object of 
     * the character the iterator currently refers to
     * @stable ICU 2.0
     */
    inline int32_t       getIndex(void) const;

/**
     * Returns the length of the entire text in the underlying
     * text-storage object.
     * @return the length of the entire text in the text-storage object
     * @stable ICU 2.0
     */
    inline int32_t           getLength() const;

/**
     * Moves the current position relative to the start or end 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.
     * @param delta the position relative to origin. A positive delta means forward;
     * a negative delta means backward.
     * @param origin Origin enumeration {kStart, kCurrent, kEnd}
     * @return the new position
     * @stable ICU 2.0
     */
    virtual int32_t      move(int32_t delta, EOrigin origin) = 0;

/**
     * Moves the current position relative to the start or end of the
     * iteration range, or relative to the current position itself.
     * The movement is expressed in numbers of code points forward
     * or backward by specifying a positive or negative delta.
     * @param delta the position relative to origin. A positive delta means forward;
     * a negative delta means backward.
     * @param origin Origin enumeration {kStart, kCurrent, kEnd}
     * @return the new position
     * @stable ICU 2.0
     */
#ifdef move32
     // One of the system headers right now is sometimes defining a conflicting macro we don't use
#undef move32
#endif
    virtual int32_t      move32(int32_t delta, EOrigin origin) = 0;

/**
     * Copies the text under iteration into the UnicodeString
     * referred to by "result".  
     * @param result Receives a copy of the text under iteration.  
     * @stable ICU 2.0
     */
    virtual void            getText(UnicodeString&  result) = 0;

protected:
    /**
     * Empty constructor.
     * @stable ICU 2.0
     */
    CharacterIterator();

/**
     * Constructor, just setting the length field in this base class.
     * @stable ICU 2.0
     */
    CharacterIterator(int32_t length);

/**
     * Constructor, just setting the length and position fields in this base class.
     * @stable ICU 2.0
     */
    CharacterIterator(int32_t length, int32_t position);

/**
     * Constructor, just setting the length, start, end, and position fields in this base class.
     * @stable ICU 2.0
     */
    CharacterIterator(int32_t length, int32_t textBegin, int32_t textEnd, int32_t position);
  
    /**
     * Copy constructor.
     *
     * @param that The CharacterIterator to be copied
     * @stable ICU 2.0
     */
    CharacterIterator(const CharacterIterator &that);

/**
     * Assignment operator.  Sets this CharacterIterator to have the same behavior,
     * as the one passed in.
     * @param that The CharacterIterator passed in.
     * @return the newly set CharacterIterator.
     * @stable ICU 2.0
     */
    CharacterIterator &operator=(const CharacterIterator &that);

/**
     * Base class text length field.
     * Necessary this for correct getText() and hashCode().
     * @stable ICU 2.0
     */
    int32_t textLength;

/**
     * Base class field for the current position.
     * @stable ICU 2.0
     */
    int32_t  pos;

/**
     * Base class field for the start of the iteration range.
     * @stable ICU 2.0
     */
    int32_t  begin;

/**
     * Base class field for the end of the iteration range.
     * @stable ICU 2.0
     */
    int32_t  end;
};

inline UBool
ForwardCharacterIterator::operator!=(const ForwardCharacterIterator& that) const {
    return !operator==(that);
}

inline int32_t
CharacterIterator::setToStart() {
    return move(0, kStart);
}

inline int32_t
CharacterIterator::setToEnd() {
    return move(0, kEnd);
}

inline int32_t
CharacterIterator::startIndex(void) const {
    return begin;
}

inline int32_t
CharacterIterator::endIndex(void) const {
    return end;
}

inline int32_t
CharacterIterator::getIndex(void) const {
    return pos;
}

inline int32_t
CharacterIterator::getLength(void) const {
    return textLength;
}

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif

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