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 4Ñ    // Â© 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
*   Copyright (C) 1998-2005, International Business Machines
*   Corporation and others.  All Rights Reserved.
**********************************************************************
*/

#ifndef UCHRITER_H
#define UCHRITER_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/chariter.h"

/**
 * \file 
 * \brief C++ API: char16_t Character Iterator
 */
 
U_NAMESPACE_BEGIN

/**
 * A concrete subclass of CharacterIterator that iterates over the
 * characters (code units or code points) in a char16_t array.
 * It's possible not only to create an
 * iterator that iterates over an entire char16_t array, but also to
 * create one that iterates over only a subrange of a char16_t array
 * (iterators over different subranges of the same char16_t array don't
 * compare equal).
 * @see CharacterIterator
 * @see ForwardCharacterIterator
 * @stable ICU 2.0
 */
class U_COMMON_API UCharCharacterIterator : public CharacterIterator {
public:
  /**
   * Create an iterator over the char16_t array referred to by "textPtr".
   * The iteration range is 0 to <code>length-1</code>.
   * text is only aliased, not adopted (the
   * destructor will not delete it).
   * @param textPtr The char16_t array to be iterated over
   * @param length The length of the char16_t array
   * @stable ICU 2.0
   */
  UCharCharacterIterator(ConstChar16Ptr textPtr, int32_t length);

  /**
   * Create an iterator over the char16_t array referred to by "textPtr".
   * The iteration range is 0 to <code>length-1</code>.
   * text is only aliased, not adopted (the
   * destructor will not delete it).
   * The starting
   * position is specified by "position". If "position" is outside the valid
   * iteration range, the behavior of this object is undefined.
   * @param textPtr The char16_t array to be iteratd over
   * @param length The length of the char16_t array
   * @param position The starting position of the iteration
   * @stable ICU 2.0
   */
  UCharCharacterIterator(ConstChar16Ptr textPtr, int32_t length,
                         int32_t position);

  /**
   * Create an iterator over the char16_t array referred to by "textPtr".
   * The iteration range is 0 to <code>end-1</code>.
   * text is only aliased, not adopted (the
   * destructor will not delete it).
   * The starting
   * position is specified by "position". If begin and end do not
   * form a valid iteration range or "position" is outside the valid
   * iteration range, the behavior of this object is undefined.
   * @param textPtr The char16_t array to be iterated over
   * @param length The length of the char16_t array
   * @param textBegin  The begin position of the iteration range
   * @param textEnd    The end position of the iteration range
   * @param position    The starting position of the iteration
   * @stable ICU 2.0
   */
  UCharCharacterIterator(ConstChar16Ptr textPtr, int32_t length,
                         int32_t textBegin,
                         int32_t textEnd,
                         int32_t position);

  /**
   * Copy constructor.  The new iterator iterates over the same range
   * of the same string as "that", and its initial position is the
   * same as "that"'s current position.
   * @param that The UCharCharacterIterator to be copied
   * @stable ICU 2.0
   */
  UCharCharacterIterator(const UCharCharacterIterator&  that);

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

  /**
   * Assignment operator.  *this is altered to iterate over the sane
   * range of the same string as "that", and refers to the same
   * character within that string as "that" does.
   * @param that The object to be copied
   * @return the newly created object
   * @stable ICU 2.0
   */
  UCharCharacterIterator&
  operator=(const UCharCharacterIterator&    that);

  /**
   * Returns true if the iterators iterate over the same range of the
   * 