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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 ********************************************************************************
 *   Copyright (C) 1997-2016, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 ********************************************************************************
 *
 * File brkiter.h
 *
 * Modification History:
 *
 *   Date        Name        Description
 *   02/18/97    aliu        Added typedef for TextCount.  Made DONE const.
 *   05/07/97    aliu        Fixed DLL declaration.
 *   07/09/97    jfitz       Renamed BreakIterator and interface synced with JDK
 *   08/11/98    helena      Sync-up JDK1.2.
 *   01/13/2000  helena      Added UErrorCode parameter to createXXXInstance methods.
 ********************************************************************************
 */
 
 #ifndef BRKITER_H
 #define BRKITER_H
 
 #include "unicode/utypes.h"
 
 /**
  * \file
  * \brief C++ API: Break Iterator.
  */
 
 #include "unicode/utypes.h"
 
 #if U_SHOW_CPLUSPLUS_API
 
 #if UCONFIG_NO_BREAK_ITERATION
 
 U_NAMESPACE_BEGIN
 
 /*
  * Allow the declaration of APIs with pointers to BreakIterator
  * even when break iteration is removed from the build.
  */
 class BreakIterator;
 
 U_NAMESPACE_END
 
 #else
 
 #include "unicode/uobject.h"
 #include "unicode/unistr.h"
 #include "unicode/chariter.h"
 #include "unicode/locid.h"
 #include "unicode/ubrk.h"
 #include "unicode/strenum.h"
 #include "unicode/utext.h"
 #include "unicode/umisc.h"
 
 U_NAMESPACE_BEGIN
 
 /**
  * The BreakIterator class implements methods for finding the location
  * of boundaries in text. BreakIterator is an abstract base class.
  * Instances of BreakIterator maintain a current position and scan over
  * text returning the index of characters where boundaries occur.
  * <p>
  * Line boundary analysis determines where a text string can be broken
  * when line-wrapping. The mechanism correctly handles punctuation and
  * hyphenated words.
  * <p>
  * Sentence boundary analysis allows selection with correct
  * interpretation of periods within numbers and abbreviations, and
  * trailing punctuation marks such as quotation marks and parentheses.
  * <p>
  * Word boundary analysis is used by search and replace functions, as
  * well as within text editing applications that allow the user to
  * select words with a double click. Word selection provides correct
  * interpretation of punctuation marks within and following
  * words. Characters that are not part of a word, such as symbols or
  * punctuation marks, have word-breaks on both sides.
  * <p>
  * Character boundary analysis allows users to interact with
  * characters as they expect to, for example, when moving the cursor
  * through a text string. Character boundary analysis provides correct
  * navigation of through character strings, regardless of how the
  * character is stored.  For example, an accented character might be
  * stored as a base character and a diacritical mark. What users
  * consider to be a character can differ between languages.
  * <p>
  * The text boundary positions are found according to the rules
  * described in Unicode Standard Annex #29, Text Boundaries, and
  * Unicode Standard Annex #14, Line Breaking Properties.  These
  * are available at http://www.unicode.org/reports/tr14/ and
  * http://www.unicode.org/reports/tr29/.
  * <p>
  * In addition to the C++ API defined in this header file, a
  * plain C API with equivalent functionality is defined in the
  * file ubrk.h
  * <p>
  * Code snippets illustrating the use of the Break Iterator APIs
  * are available in the ICU User Guide,
  * https://unicode-org.github.io/icu/userguide/boundaryanalysis/
  * and in the sample program icu/source/samples/break/break.cpp
  *
  */
 class U_COMMON_API BreakIterator : public UObject {
 public:
     /**
      *  destructor
      *  @stable ICU 2.0
      */
     virtual ~BreakIterator();
 
     /**
      * Return true if another object is semantically equal to this
      * one. The other object should be an instance of the same subclass of
      * BreakIterator. Objects of different subclasses are considered
      * unequal.
      * <P>
      * Return true if this BreakIterator is at the same position in the
      * same text, and is the same class and type (word, line, etc.) of
      * BreakIterator, as the argument.  Text is considered the same if
      * it contains the same characters, it need not be the same
      * object, and styles are not considered.
      * @stable ICU 2.0
      */
     virtual bool operator==(const BreakIterator&) const = 0;
 
     /**
      * Returns the complement of the result of operator==
      * @param rhs The BreakIterator to be compared for inequality
      * @return the complement of the result of operator==
      * @stable ICU 2.0
      */
     bool operator!=(const BreakIterator& rhs) const { return !operator==(rhs); }
 
     /**
      * Return a polymorphic copy of this object.  This is an abstract
      * method which subclasses implement.
      * @stable ICU 2.0
      */
     virtual BreakIterator* clone() const = 0;
 
     /**
      * Return a polymorphic class ID for this object. Different subclasses
      * will return distinct unequal values.
      * @stable ICU 2.0
      */
     virtual UClassID getDynamicClassID() const override = 0;
 
     /**
      * Return a CharacterIterator over the text being analyzed.
      * @stable ICU 2.0
      */
     virtual CharacterIterator& getText() const = 0;
 
     /**
       *  Get a UText for the text being analyzed.
       *  The returned UText is a shallow clone of the UText used internally
       *  by the break iterator implementation.  It can safely be used to
       *  access the text without impacting any break iterator operations,
       *  but the underlying text itself must not be altered.
       *
       * @param fillIn A UText to be filled in.  If nullptr, a new UText will be
       *           allocated to hold the result.
       * @param status receives any error codes.
       * @return   The current UText for this break iterator.  If an input
       *           UText was provided, it will always be returned.
       * @stable ICU 3.4
       */
      virtual UText *getUText(UText *fillIn, UErrorCode &status) const = 0;
 
     /**
      * Change the text over which this operates. The text boundary is
      * reset to the start.
      *
      * The BreakIterator will retain a reference to the supplied string.
      * The caller must not modify or delete the text while the BreakIterator
      * retains the reference.
      *
      * @param text The UnicodeString used to change the text.
      * @stable ICU 2.0
      */
     virtual void  setText(const UnicodeString &text) = 0;
 
     /**
      * Reset the break iterator to operate over the text represented by
      * the UText.  The iterator position is reset to the start.
      *
      * This function makes a shallow clone of the supplied UText.  This means
      * that the caller is free to immediately close or otherwise reuse the
      * Utext that was passed as a parameter, but that the underlying text itself
      * must not be altered while being referenced by the break iterator.
      *
      * All index positions returned by break iterator functions are
      * native indices from the UText. For example, when breaking UTF-8
      * encoded text, the break positions returned by next(), previous(), etc.
      * will be UTF-8 string indices, not UTF-16 positions.
      *
      * @param text The UText used to change the text.
      * @param status receives any error codes.
      * @stable ICU 3.4
      */
     virtual void  setText(UText *text, UErrorCode &status) = 0;
 
     /**
      * Change the text over which this operates. The text boundary is
      * reset to the start.
      * Note that setText(UText *) provides similar functionality to this function,
      * and is more efficient.
      * @param it The CharacterIterator used to change the text.
      * @stable ICU 2.0
      */
     virtual void  adoptText(CharacterIterator* it) = 0;
 
     enum {
         /**
          * DONE is returned by previous() and next() after all valid
          * boundaries have been returned.
          * @stable ICU 2.0
          */
         DONE = static_cast<int32_t>(-1)
     };
 
     /**
      * Sets the current iteration position to the beginning of the text, position zero.
      * @return The offset of the beginning of the text, zero.
      * @stable ICU 2.0
      */
     virtual int32_t first() = 0;
 
     /**
      * Set the iterator position to the index immediately BEYOND the last character in the text being scanned.
      * @return The index immediately BEYOND the last character in the text being scanned.
      * @stable ICU 2.0
      */
     virtual int32_t last() = 0;
 
     /**
      * Set the iterator position to the boundary preceding the current boundary.
      * @return The character index of the previous text boundary or DONE if all
      * boundaries have been returned.
      * @stable ICU 2.0
      */
     virtual int32_t previous() = 0;
 
     /**
      * Advance the iterator to the boundary following the current boundary.
      * @return The character index of the next text boundary or DONE if all
      * boundaries have been returned.
      * @stable ICU 2.0
      */
     virtual int32_t next() = 0;
 
     /**
      * Return character index of the current iterator position within the text.
      * @return The boundary most recently returned.
      * @stable ICU 2.0
      */
     virtual int32_t current() const = 0;
 
     /**
      * Advance the iterator to the first boundary following the specified offset.
      * The value returned is always greater than the offset or
      * the value BreakIterator.DONE
      * @param offset the offset to begin scanning.
      * @return The first boundary after the specified offset.
      * @stable ICU 2.0
      */
     virtual int32_t following(int32_t offset) = 0;
 
     /**
      * Set the iterator position to the first boundary preceding the specified offset.
      * The value returned is always smaller than the offset or
      * the value BreakIterator.DONE
      * @param offset the offset to begin scanning.
      * @return The first boundary before the specified offset.
      * @stable ICU 2.0
      */
     virtual int32_t preceding(int32_t offset) = 0;
 
     /**
      * Return true if the specified position is a boundary position.
      * As a side effect, the current position of the iterator is set
      * to the first boundary position at or following the specified offset.
      * @param offset the offset to check.
      * @return True if "offset" is a boundary position.
      * @stable ICU 2.0
      */
     virtual UBool isBoundary(int32_t offset) = 0;
 
     /**
      * Set the iterator position to the nth boundary from the current boundary
      * @param n the number of boundaries to move by.  A value of 0
      * does nothing.  Negative values move to previous boundaries
      * and positive values move to later boundaries.
      * @return The new iterator position, or
      * DONE if there are fewer than |n| boundaries in the specified direction.
      * @stable ICU 2.0
      */
     virtual int32_t next(int32_t n) = 0;
 
    /**
      * For RuleBasedBreakIterators, return the status tag from the break rule
      * that determined the boundary at the current iteration position.
      * <p>
      * For break iterator types that do not support a rule status,
      * a default value of 0 is returned.
      * <p>
      * @return the status from the break rule that determined the boundary at
      *         the current iteration position.
      * @see RuleBaseBreakIterator::getRuleStatus()
      * @see UWordBreak
      * @stable ICU 52
      */
     virtual int32_t getRuleStatus() const;
 
    /**
     * For RuleBasedBreakIterators, get the status (tag) values from the break rule(s)
     * that determined the boundary at the current iteration position.
     * <p>
     * For break iterator types that do not support rule status,
     * no values are returned.
     * <p>
     * The returned status value(s) are stored into an array provided by the caller.
     * The values are stored in sorted (ascending) order.
     * If the capacity of the output array is insufficient to hold the data,
     *  the output will be truncated to the available length, and a
     *  U_BUFFER_OVERFLOW_ERROR will be signaled.
     * <p>
     * @see RuleBaseBreakIterator::getRuleStatusVec
     *
     * @param fillInVec an array to be filled in with the status values.
     * @param capacity  the length of the supplied vector.  A length of zero causes
     *                  the function to return the number of status values, in the
     *                  normal way, without attempting to store any values.
     * @param status    receives error codes.
     * @return          The number of rule status values from rules that determined
     *                  the boundary at the current iteration position.
     *                  In the event of a U_BUFFER_OVERFLOW_ERROR, the return value
     *                  is the total number of status values that were available,
     *                  not the reduced number that were actually returned.
     * @see getRuleStatus
     * @stable ICU 52
     */
     virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status);
 
     /**
      * Create BreakIterator for word-breaks using the given locale.
      * Returns an instance of a BreakIterator implementing word breaks.
      * WordBreak is useful for word selection (ex. double click)
      * @param where the locale.
      * @param status the error code
      * @return A BreakIterator for word-breaks.  The UErrorCode& status
      * parameter is used to return status information to the user.
      * To check whether the construction succeeded or not, you should check
      * the value of U_SUCCESS(err).  If you wish more detailed information, you
      * can check for informational error results which still indicate success.
      * U_USING_FALLBACK_WARNING indicates that a fall back locale was used.  For
      * example, 'de_CH' was requested, but nothing was found there, so 'de' was
      * used.  U_USING_DEFAULT_WARNING indicates that the default locale data was
      * used; neither the requested locale nor any of its fall back locales
      * could be found.
      * The caller owns the returned object and is responsible for deleting it.
      * @stable ICU 2.0
      */
     static BreakIterator* U_EXPORT2
     createWordInstance(const Locale& where, UErrorCode& status);
 
     /**
      * Create BreakIterator for line-breaks using specified locale.
      * Returns an instance of a BreakIterator implementing line breaks. Line
      * breaks are logically possible line breaks, actual line breaks are
      * usually determined based on display width.
      * LineBreak is useful for word wrapping text.
      * @param where the locale.
      * @param status The error code.
      * @return A BreakIterator for line-breaks.  The UErrorCode& status
      * parameter is used to return status information to the user.
      * To check whether the construction succeeded or not, you should check
      * the value of U_SUCCESS(err).  If you wish more detailed information, you
      * can check for informational error results which still indicate success.
      * U_USING_FALLBACK_WARNING indicates that a fall back locale was used.  For
      * example, 'de_CH' was requested, but nothing was found there, so 'de' was
      * used.  U_USING_DEFAULT_WARNING indicates that the default locale data was
      * used; neither the requested locale nor any of its fall back locales
      * could be found.
      * The caller owns the returned object and is responsible for deleting it.
      * @stable ICU 2.0
      */
     static BreakIterator* U_EXPORT2
     createLineInstance(const Locale& where, UErrorCode& status);
 
     /**
      * Create BreakIterator for character-breaks using specified locale
      * Returns an instance of a BreakIterator implementing character breaks.
      * Character breaks are boundaries of combining character sequences.
      * @param where the locale.
      * @param status The error code.
      * @return A BreakIterator for character-breaks.  The UErrorCode& status
      * parameter is used to return status information to the user.
      * To check whether the construction succeeded or not, you should check
      * the value of U_SUCCESS(err).  If you wish more detailed information, you
      * can check for informational error results which still indicate success.
      * U_USING_FALLBACK_WARNING indicates that a fall back locale was used.  For
      * example, 'de_CH' was requested, but nothing was found there, so 'de' was
      * used.  U_USING_DEFAULT_WARNING indicates that the default locale data was
      * used; neither the requested locale nor any of its fall back locales
      * could be found.
      * The caller owns the returned object and is responsible for deleting it.
      * @stable ICU 2.0
      */
     static BreakIterator* U_EXPORT2
     createCharacterInstance(const Locale& where, UErrorCode& status);
 
     /**
      * Create BreakIterator for sentence-breaks using specified locale
      * Returns an instance of a BreakIterator implementing sentence breaks.
      * @param where the locale.
      * @param status The error code.
      * @return A BreakIterator for sentence-breaks.  The UErrorCode& status
      * parameter is used to return status information to the user.
      * To check whether the construction succeeded or not, you should check
      * the value of U_SUCCESS(err).  If you wish more detailed information, you
      * can check for informational error results which still indicate success.
      * U_USING_FALLBACK_WARNING indicates that a fall back locale was used.  For
      * example, 'de_CH' was requested, but nothing was found there, so 'de' was
      * used.  U_USING_DEFAULT_WARNING indicates that the default locale data was
      * used; neither the requested locale nor any of its fall back locales
      * could be found.
      * The caller owns the returned object and is responsible for deleting it.
      * @stable ICU 2.0
      */
     static BreakIterator* U_EXPORT2
     createSentenceInstance(const Locale& where, UErrorCode& status);
 
 #ifndef U_HIDE_DEPRECATED_API
     /**
      * Create BreakIterator for title-casing breaks using the specified locale
      * Returns an instance of a BreakIterator implementing title breaks.
      * The iterator returned locates title boundaries as described for
      * Unicode 3.2 only. For Unicode 4.0 and above title boundary iteration,
      * please use a word boundary iterator. See {@link #createWordInstance }.
      *
      * @param where the locale.
      * @param status The error code.
      * @return A BreakIterator for title-breaks.  The UErrorCode& status
      * parameter is used to return status information to the user.
      * To check whether the construction succeeded or not, you should check
      * the value of U_SUCCESS(err).  If you wish more detailed information, you
      * can check for informational error results which still indicate success.
      * U_USING_FALLBACK_WARNING indicates that a fall back locale was used.  For
      * example, 'de_CH' was requested, but nothing was found there, so 'de' was
      * used.  U_USING_DEFAULT_WARNING indicates that the default locale data was
      * used; neither the requested locale nor any of its fall back locales
      * could be found.
      * The caller owns the returned object and is responsible for deleting it.
      * @deprecated ICU 64 Use createWordInstance instead.
      */
     static BreakIterator* U_EXPORT2
     createTitleInstance(const Locale& where, UErrorCode& status);
 #endif /* U_HIDE_DEPRECATED_API */
 
     /**
      * Get the set of Locales for which TextBoundaries are installed.
      * <p><b>Note:</b> this will not return locales added through the register
      * call. To see the registered locales too, use the getAvailableLocales
      * function that returns a StringEnumeration object </p>
      * @param count the output parameter of number of elements in the locale list
      * @return available locales
      * @stable ICU 2.0
      */
     static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
 
     /**
      * Get name of the object for the desired Locale, in the desired language.
      * @param objectLocale must be from getAvailableLocales.
      * @param displayLocale specifies the desired locale for output.
      * @param name the fill-in parameter of the return value
      * Uses best match.
      * @return user-displayable name
      * @stable ICU 2.0
      */
     static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
                                          const Locale& displayLocale,
                                          UnicodeString& name);
 
     /**
      * Get name of the object for the desired Locale, in the language of the
      * default locale.
      * @param objectLocale must be from getMatchingLocales
      * @param name the fill-in parameter of the return value
      * @return user-displayable name
      * @stable ICU 2.0
      */
     static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
                                          UnicodeString& name);
 
 #ifndef U_FORCE_HIDE_DEPRECATED_API
     /**
      * Deprecated functionality. Use clone() instead.
      *
      * Thread safe client-buffer-based cloning operation
      *    Do NOT call delete on a safeclone, since 'new' is not used to create it.
      * @param stackBuffer user allocated space for the new clone. If nullptr new memory will be allocated.
      * If buffer is not large enough, new memory will be allocated.
      * @param BufferSize reference to size of allocated space.
      * If BufferSize == 0, a sufficient size for use in cloning will
      * be returned ('pre-flighting')
      * If BufferSize is not enough for a stack-based safe clone,
      * new memory will be allocated.
      * @param status to indicate whether the operation went on smoothly or there were errors
      *  An informational status value, U_SAFECLONE_ALLOCATED_ERROR, is used if any allocations were
      *  necessary.
      * @return pointer to the new clone
      *
      * @deprecated ICU 52. Use clone() instead.
      */
     virtual BreakIterator *  createBufferClone(void *stackBuffer,
                                                int32_t &BufferSize,
                                                UErrorCode &status) = 0;
 #endif  // U_FORCE_HIDE_DEPRECATED_API
 
 #ifndef U_HIDE_DEPRECATED_API
 
     /**
      *   Determine whether the BreakIterator was created in user memory by
      *   createBufferClone(), and thus should not be deleted.  Such objects
      *   must be closed by an explicit call to the destructor (not delete).
      * @deprecated ICU 52. Always delete the BreakIterator.
      */
     inline UBool isBufferClone();
 
 #endif /* U_HIDE_DEPRECATED_API */
 
 #if !UCONFIG_NO_SERVICE
     /**
      * Register a new break iterator of the indicated kind, to use in the given locale.
      * The break iterator will be adopted.  Clones of the iterator will be returned
      * if a request for a break iterator of the given kind matches or falls back to
      * this locale.
      * Because ICU may choose to cache BreakIterators internally, this must
      * be called at application startup, prior to any calls to
      * BreakIterator::createXXXInstance to avoid undefined behavior.
      * @param toAdopt the BreakIterator instance to be adopted
      * @param locale the Locale for which this instance is to be registered
      * @param kind the type of iterator for which this instance is to be registered
      * @param status the in/out status code, no special meanings are assigned
      * @return a registry key that can be used to unregister this instance
      * @stable ICU 2.4
      */
     static URegistryKey U_EXPORT2 registerInstance(BreakIterator* toAdopt,
                                         const Locale& locale,
                                         UBreakIteratorType kind,
                                         UErrorCode& status);
 
     /**
      * Unregister a previously-registered BreakIterator using the key returned from the
      * register call.  Key becomes invalid after a successful call and should not be used again.
      * The BreakIterator corresponding to the key will be deleted.
      * Because ICU may choose to cache BreakIterators internally, this should
      * be called during application shutdown, after all calls to
      * BreakIterator::createXXXInstance to avoid undefined behavior.
      * @param key the registry key returned by a previous call to registerInstance
      * @param status the in/out status code, no special meanings are assigned
      * @return true if the iterator for the key was successfully unregistered
      * @stable ICU 2.4
      */
     static UBool U_EXPORT2 unregister(URegistryKey key, UErrorCode& status);
 
     /**
      * Return a StringEnumeration over the locales available at the time of the call,
      * including registered locales.
      * @return a StringEnumeration over the locales available at the time of the call
      * @stable ICU 2.4
      */
     static StringEnumeration* U_EXPORT2 getAvailableLocales();
 #endif
 
     /**
      * Returns the locale for this break iterator. Two flavors are available: valid and
      * actual locale.
      * @stable ICU 2.8
      */
     Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
 
 #ifndef U_HIDE_INTERNAL_API
     /** Get the locale for this break iterator object. You can choose between valid and actual locale.
      *  @param type type of the locale we're looking for (valid or actual)
      *  @param status error code for the operation
      *  @return the locale
      *  @internal
      */
     const char *getLocaleID(ULocDataLocaleType type, UErrorCode& status) const;
 #endif  /* U_HIDE_INTERNAL_API */
 
     /**
      *  Set the subject text string upon which the break iterator is operating
      *  without changing any other aspect of the matching state.
      *  The new and previous text strings must have the same content.
      *
      *  This function is intended for use in environments where ICU is operating on
      *  strings that may move around in memory.  It provides a mechanism for notifying
      *  ICU that the string has been relocated, and providing a new UText to access the
      *  string in its new position.
      *
      *  Note that the break iterator implementation never copies the underlying text
      *  of a string being processed, but always operates directly on the original text
      *  provided by the user. Refreshing simply drops the references to the old text
      *  and replaces them with references to the new.
      *
      *  Caution:  this function is normally used only by very specialized,
      *  system-level code.  One example use case is with garbage collection that moves
      *  the text in memory.
      *
      * @param input      The new (moved) text string.
      * @param status     Receives errors detected by this function.
      * @return           *this
      *
      * @stable ICU 49
      */
     virtual BreakIterator &refreshInputText(UText *input, UErrorCode &status) = 0;
 
  private:
     static BreakIterator* buildInstance(const Locale& loc, const char *type, UErrorCode& status);
     static BreakIterator* createInstance(const Locale& loc, int32_t kind, UErrorCode& status);
     static BreakIterator* makeInstance(const Locale& loc, int32_t kind, UErrorCode& status);
 
     friend class ICUBreakIteratorFactory;
     friend class ICUBreakIteratorService;
 
 protected:
     // Do not enclose protected default/copy constructors with #ifndef U_HIDE_INTERNAL_API
     // or else the compiler will create a public ones.
     /** @internal */
     BreakIterator();
     /** @internal */
     BreakIterator (const BreakIterator &other);
 #ifndef U_HIDE_INTERNAL_API
     /** @internal */
     BreakIterator (const Locale& valid, const Locale &actual);
     /** @internal. Assignment Operator, used by RuleBasedBreakIterator. */
     BreakIterator &operator = (const BreakIterator &other);
 #endif  /* U_HIDE_INTERNAL_API */
 
 private:
 
     /** @internal (private) */
     char actualLocale[ULOC_FULLNAME_CAPACITY];
     char validLocale[ULOC_FULLNAME_CAPACITY];
     char requestLocale[ULOC_FULLNAME_CAPACITY];
 };
 
 #ifndef U_HIDE_DEPRECATED_API
 
 inline UBool BreakIterator::isBufferClone()
 {
     return false;
 }
 
 #endif /* U_HIDE_DEPRECATED_API */
 
 U_NAMESPACE_END
 
 #endif /* #if !UCONFIG_NO_BREAK_ITERATION */
 
 #endif /* U_SHOW_CPLUSPLUS_API */
 
 #endif // BRKITER_H
 //eof

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