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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 *******************************************************************************
 *
 *   Copyright (C) 2009-2013, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  normalizer2.h
 *   encoding:   UTF-8
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2009nov22
 *   created by: Markus W. Scherer
 */
 
 #ifndef __NORMALIZER2_H__
 #define __NORMALIZER2_H__
 
 /**
  * \file
  * \brief C++ API: New API for Unicode Normalization.
  */
 
 #include "unicode/utypes.h"
 
 #if U_SHOW_CPLUSPLUS_API
 
 #if !UCONFIG_NO_NORMALIZATION
 
 #include "unicode/stringpiece.h"
 #include "unicode/uniset.h"
 #include "unicode/unistr.h"
 #include "unicode/unorm2.h"
 
 U_NAMESPACE_BEGIN
 
 class ByteSink;
 
 /**
  * Unicode normalization functionality for standard Unicode normalization or
  * for using custom mapping tables.
  * All instances of this class are unmodifiable/immutable.
  * Instances returned by getInstance() are singletons that must not be deleted by the caller.
  * The Normalizer2 class is not intended for public subclassing.
  *
  * The primary functions are to produce a normalized string and to detect whether
  * a string is already normalized.
  * The most commonly used normalization forms are those defined in
  * http://www.unicode.org/unicode/reports/tr15/
  * However, this API supports additional normalization forms for specialized purposes.
  * For example, NFKC_Casefold is provided via getInstance("nfkc_cf", COMPOSE)
  * and can be used in implementations of UTS #46.
  *
  * Not only are the standard compose and decompose modes supplied,
  * but additional modes are provided as documented in the Mode enum.
  *
  * Some of the functions in this class identify normalization boundaries.
  * At a normalization boundary, the portions of the string
  * before it and starting from it do not interact and can be handled independently.
  *
  * The spanQuickCheckYes() stops at a normalization boundary.
  * When the goal is a normalized string, then the text before the boundary
  * can be copied, and the remainder can be processed with normalizeSecondAndAppend().
  *
  * The hasBoundaryBefore(), hasBoundaryAfter() and isInert() functions test whether
  * a character is guaranteed to be at a normalization boundary,
  * regardless of context.
  * This is used for moving from one normalization boundary to the next
  * or preceding boundary, and for performing iterative normalization.
  *
  * Iterative normalization is useful when only a small portion of a
  * longer string needs to be processed.
  * For example, in ICU, iterative normalization is used by the NormalizationTransliterator
  * (to avoid replacing already-normalized text) and ucol_nextSortKeyPart()
  * (to process only the substring for which sort key bytes are computed).
  *
  * The set of normalization boundaries returned by these functions may not be
  * complete: There may be more boundaries that could be returned.
  * Different functions may return different boundaries.
  * @stable ICU 4.4
  */
 class U_COMMON_API Normalizer2 : public UObject {
 public:
     /**
      * Destructor.
      * @stable ICU 4.4
      */
     ~Normalizer2();
 
     /**
      * Returns a Normalizer2 instance for Unicode NFC normalization.
      * Same as getInstance(nullptr, "nfc", UNORM2_COMPOSE, errorCode).
      * Returns an unmodifiable singleton instance. Do not delete it.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @stable ICU 49
      */
     static const Normalizer2 *
     getNFCInstance(UErrorCode &errorCode);
 
     /**
      * Returns a Normalizer2 instance for Unicode NFD normalization.
      * Same as getInstance(nullptr, "nfc", UNORM2_DECOMPOSE, errorCode).
      * Returns an unmodifiable singleton instance. Do not delete it.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @stable ICU 49
      */
     static const Normalizer2 *
     getNFDInstance(UErrorCode &errorCode);
 
     /**
      * Returns a Normalizer2 instance for Unicode NFKC normalization.
      * Same as getInstance(nullptr, "nfkc", UNORM2_COMPOSE, errorCode).
      * Returns an unmodifiable singleton instance. Do not delete it.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @stable ICU 49
      */
     static const Normalizer2 *
     getNFKCInstance(UErrorCode &errorCode);
 
     /**
      * Returns a Normalizer2 instance for Unicode NFKD normalization.
      * Same as getInstance(nullptr, "nfkc", UNORM2_DECOMPOSE, errorCode).
      * Returns an unmodifiable singleton instance. Do not delete it.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @stable ICU 49
      */
     static const Normalizer2 *
     getNFKDInstance(UErrorCode &errorCode);
 
     /**
      * Returns a Normalizer2 instance for Unicode toNFKC_Casefold() normalization
      * which is equivalent to applying the NFKC_Casefold mappings and then NFC.
      * See https://www.unicode.org/reports/tr44/#NFKC_Casefold
      *
      * Same as getInstance(nullptr, "nfkc_cf", UNORM2_COMPOSE, errorCode).
      * Returns an unmodifiable singleton instance. Do not delete it.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @stable ICU 49
      */
     static const Normalizer2 *
     getNFKCCasefoldInstance(UErrorCode &errorCode);
 
 #ifndef U_HIDE_DRAFT_API
     /**
      * Returns a Normalizer2 instance for a variant of Unicode toNFKC_Casefold() normalization
      * which is equivalent to applying the NFKC_Simple_Casefold mappings and then NFC.
      * See https://www.unicode.org/reports/tr44/#NFKC_Simple_Casefold
      *
      * Same as getInstance(nullptr, "nfkc_scf", UNORM2_COMPOSE, errorCode).
      * Returns an unmodifiable singleton instance. Do not delete it.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @draft ICU 74
      */
     static const Normalizer2 *
     getNFKCSimpleCasefoldInstance(UErrorCode &errorCode);
 #endif  // U_HIDE_DRAFT_API
 
     /**
      * Returns a Normalizer2 instance which uses the specified data file
      * (packageName/name similar to ucnv_openPackage() and ures_open()/ResourceBundle)
      * and which composes or decomposes text according to the specified mode.
      * Returns an unmodifiable singleton instance. Do not delete it.
      *
      * Use packageName=nullptr for data files that are part of ICU's own data.
      * Use name="nfc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFC/NFD.
      * Use name="nfkc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFKC/NFKD.
      * Use name="nfkc_cf" and UNORM2_COMPOSE for Unicode standard NFKC_CF=NFKC_Casefold.
      *
      * @param packageName nullptr for ICU built-in data, otherwise application data package name
      * @param name "nfc" or "nfkc" or "nfkc_cf" or "nfkc_scf" or name of custom data file
      * @param mode normalization mode (compose or decompose etc.)
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the requested Normalizer2, if successful
      * @stable ICU 4.4
      */
     static const Normalizer2 *
     getInstance(const char *packageName,
                 const char *name,
                 UNormalization2Mode mode,
                 UErrorCode &errorCode);
 
     /**
      * Returns the normalized form of the source string.
      * @param src source string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return normalized src
      * @stable ICU 4.4
      */
     UnicodeString
     normalize(const UnicodeString &src, UErrorCode &errorCode) const {
         UnicodeString result;
         normalize(src, result, errorCode);
         return result;
     }
     /**
      * Writes the normalized form of the source string to the destination string
      * (replacing its contents) and returns the destination string.
      * The source and destination strings must be different objects.
      * @param src source string
      * @param dest destination string; its contents is replaced with normalized src
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.4
      */
     virtual UnicodeString &
     normalize(const UnicodeString &src,
               UnicodeString &dest,
               UErrorCode &errorCode) const = 0;
 
     /**
      * Normalizes a UTF-8 string and optionally records how source substrings
      * relate to changed and unchanged result substrings.
      *
      * Implemented completely for all built-in modes except for FCD.
      * The base class implementation converts to & from UTF-16 and does not support edits.
      *
      * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
      * @param src       Source UTF-8 string.
      * @param sink      A ByteSink to which the normalized UTF-8 result string is written.
      *                  sink.Flush() is called at the end.
      * @param edits     Records edits for index mapping, working with styled text,
      *                  and getting only changes (if any).
      *                  The Edits contents is undefined if any error occurs.
      *                  This function calls edits->reset() first unless
      *                  options includes U_EDITS_NO_RESET. edits can be nullptr.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @stable ICU 60
      */
     virtual void
     normalizeUTF8(uint32_t options, StringPiece src, ByteSink &sink,
                   Edits *edits, UErrorCode &errorCode) const;
 
     /**
      * Appends the normalized form of the second string to the first string
      * (merging them at the boundary) and returns the first string.
      * The result is normalized if the first string was normalized.
      * The first and second strings must be different objects.
      * @param first string, should be normalized
      * @param second string, will be normalized
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return first
      * @stable ICU 4.4
      */
     virtual UnicodeString &
     normalizeSecondAndAppend(UnicodeString &first,
                              const UnicodeString &second,
                              UErrorCode &errorCode) const = 0;
     /**
      * Appends the second string to the first string
      * (merging them at the boundary) and returns the first string.
      * The result is normalized if both the strings were normalized.
      * The first and second strings must be different objects.
      * @param first string, should be normalized
      * @param second string, should be normalized
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return first
      * @stable ICU 4.4
      */
     virtual UnicodeString &
     append(UnicodeString &first,
            const UnicodeString &second,
            UErrorCode &errorCode) const = 0;
 
     /**
      * Gets the decomposition mapping of c.
      * Roughly equivalent to normalizing the String form of c
      * on a UNORM2_DECOMPOSE Normalizer2 instance, but much faster, and except that this function
      * returns false and does not write a string
      * if c does not have a decomposition mapping in this instance's data.
      * This function is independent of the mode of the Normalizer2.
      * @param c code point
      * @param decomposition String object which will be set to c's
      *                      decomposition mapping, if there is one.
      * @return true if c has a decomposition, otherwise false
      * @stable ICU 4.6
      */
     virtual UBool
     getDecomposition(UChar32 c, UnicodeString &decomposition) const = 0;
 
     /**
      * Gets the raw decomposition mapping of c.
      *
      * This is similar to the getDecomposition() method but returns the
      * raw decomposition mapping as specified in UnicodeData.txt or
      * (for custom data) in the mapping files processed by the gennorm2 tool.
      * By contrast, getDecomposition() returns the processed,
      * recursively-decomposed version of this mapping.
      *
      * When used on a standard NFKC Normalizer2 instance,
      * getRawDecomposition() returns the Unicode Decomposition_Mapping (dm) property.
      *
      * When used on a standard NFC Normalizer2 instance,
      * it returns the Decomposition_Mapping only if the Decomposition_Type (dt) is Canonical (Can);
      * in this case, the result contains either one or two code points (=1..4 char16_ts).
      *
      * This function is independent of the mode of the Normalizer2.
      * The default implementation returns false.
      * @param c code point
      * @param decomposition String object which will be set to c's
      *                      raw decomposition mapping, if there is one.
      * @return true if c has a decomposition, otherwise false
      * @stable ICU 49
      */
     virtual UBool
     getRawDecomposition(UChar32 c, UnicodeString &decomposition) const;
 
     /**
      * Performs pairwise composition of a & b and returns the composite if there is one.
      *
      * Returns a composite code point c only if c has a two-way mapping to a+b.
      * In standard Unicode normalization, this means that
      * c has a canonical decomposition to a+b
      * and c does not have the Full_Composition_Exclusion property.
      *
      * This function is independent of the mode of the Normalizer2.
      * The default implementation returns a negative value.
      * @param a A (normalization starter) code point.
      * @param b Another code point.
      * @return The non-negative composite code point if there is one; otherwise a negative value.
      * @stable ICU 49
      */
     virtual UChar32
     composePair(UChar32 a, UChar32 b) const;
 
     /**
      * Gets the combining class of c.
      * The default implementation returns 0
      * but all standard implementations return the Unicode Canonical_Combining_Class value.
      * @param c code point
      * @return c's combining class
      * @stable ICU 49
      */
     virtual uint8_t
     getCombiningClass(UChar32 c) const;
 
     /**
      * Tests if the string is normalized.
      * Internally, in cases where the quickCheck() method would return "maybe"
      * (which is only possible for the two COMPOSE modes) this method
      * resolves to "yes" or "no" to provide a definitive result,
      * at the cost of doing more work in those cases.
      * @param s input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return true if s is normalized
      * @stable ICU 4.4
      */
     virtual UBool
     isNormalized(const UnicodeString &s, UErrorCode &errorCode) const = 0;
     /**
      * Tests if the UTF-8 string is normalized.
      * Internally, in cases where the quickCheck() method would return "maybe"
      * (which is only possible for the two COMPOSE modes) this method
      * resolves to "yes" or "no" to provide a definitive result,
      * at the cost of doing more work in those cases.
      *
      * This works for all normalization modes.
      * It is optimized for UTF-8 for all built-in modes except for FCD.
      * The base class implementation converts to UTF-16 and calls isNormalized().
      *
      * @param s UTF-8 input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return true if s is normalized
      * @stable ICU 60
      */
     virtual UBool
     isNormalizedUTF8(StringPiece s, UErrorCode &errorCode) const;
 
 
     /**
      * Tests if the string is normalized.
      * For the two COMPOSE modes, the result could be "maybe" in cases that
      * would take a little more work to resolve definitively.
      * Use spanQuickCheckYes() and normalizeSecondAndAppend() for a faster
      * combination of quick check + normalization, to avoid
      * re-checking the "yes" prefix.
      * @param s input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return UNormalizationCheckResult
      * @stable ICU 4.4
      */
     virtual UNormalizationCheckResult
     quickCheck(const UnicodeString &s, UErrorCode &errorCode) const = 0;
 
     /**
      * Returns the end of the normalized substring of the input string.
      * In other words, with <code>end=spanQuickCheckYes(s, ec);</code>
      * the substring <code>UnicodeString(s, 0, end)</code>
      * will pass the quick check with a "yes" result.
      *
      * The returned end index is usually one or more characters before the
      * "no" or "maybe" character: The end index is at a normalization boundary.
      * (See the class documentation for more about normalization boundaries.)
      *
      * When the goal is a normalized string and most input strings are expected
      * to be normalized already, then call this method,
      * and if it returns a prefix shorter than the input string,
      * copy that prefix and use normalizeSecondAndAppend() for the remainder.
      * @param s input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return "yes" span end index
      * @stable ICU 4.4
      */
     virtual int32_t
     spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const = 0;
 
     /**
      * Tests if the character always has a normalization boundary before it,
      * regardless of context.
      * If true, then the character does not normalization-interact with
      * preceding characters.
      * In other words, a string containing this character can be normalized
      * by processing portions before this character and starting from this
      * character independently.
      * This is used for iterative normalization. See the class documentation for details.
      * @param c character to test
      * @return true if c has a normalization boundary before it
      * @stable ICU 4.4
      */
     virtual UBool hasBoundaryBefore(UChar32 c) const = 0;
 
     /**
      * Tests if the character always has a normalization boundary after it,
      * regardless of context.
      * If true, then the character does not normalization-interact with
      * following characters.
      * In other words, a string containing this character can be normalized
      * by processing portions up to this character and after this
      * character independently.
      * This is used for iterative normalization. See the class documentation for details.
      * Note that this operation may be significantly slower than hasBoundaryBefore().
      * @param c character to test
      * @return true if c has a normalization boundary after it
      * @stable ICU 4.4
      */
     virtual UBool hasBoundaryAfter(UChar32 c) const = 0;
 
     /**
      * Tests if the character is normalization-inert.
      * If true, then the character does not change, nor normalization-interact with
      * preceding or following characters.
      * In other words, a string containing this character can be normalized
      * by processing portions before this character and after this
      * character independently.
      * This is used for iterative normalization. See the class documentation for details.
      * Note that this operation may be significantly slower than hasBoundaryBefore().
      * @param c character to test
      * @return true if c is normalization-inert
      * @stable ICU 4.4
      */
     virtual UBool isInert(UChar32 c) const = 0;
 };
 
 /**
  * Normalization filtered by a UnicodeSet.
  * Normalizes portions of the text contained in the filter set and leaves
  * portions not contained in the filter set unchanged.
  * Filtering is done via UnicodeSet::span(..., USET_SPAN_SIMPLE).
  * Not-in-the-filter text is treated as "is normalized" and "quick check yes".
  * This class implements all of (and only) the Normalizer2 API.
  * An instance of this class is unmodifiable/immutable but is constructed and
  * must be destructed by the owner.
  * @stable ICU 4.4
  */
 class U_COMMON_API FilteredNormalizer2 : public Normalizer2 {
 public:
     /**
      * Constructs a filtered normalizer wrapping any Normalizer2 instance
      * and a filter set.
      * Both are aliased and must not be modified or deleted while this object
      * is used.
      * The filter set should be frozen; otherwise the performance will suffer greatly.
      * @param n2 wrapped Normalizer2 instance
      * @param filterSet UnicodeSet which determines the characters to be normalized
      * @stable ICU 4.4
      */
     FilteredNormalizer2(const Normalizer2 &n2, const UnicodeSet &filterSet) :
             norm2(n2), set(filterSet) {}
 
     /**
      * Destructor.
      * @stable ICU 4.4
      */
     ~FilteredNormalizer2();
 
     /**
      * Writes the normalized form of the source string to the destination string
      * (replacing its contents) and returns the destination string.
      * The source and destination strings must be different objects.
      * @param src source string
      * @param dest destination string; its contents is replaced with normalized src
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.4
      */
     virtual UnicodeString &
     normalize(const UnicodeString &src,
               UnicodeString &dest,
               UErrorCode &errorCode) const override;
 
     /**
      * Normalizes a UTF-8 string and optionally records how source substrings
      * relate to changed and unchanged result substrings.
      *
      * Implemented completely for most built-in modes except for FCD.
      * The base class implementation converts to & from UTF-16 and does not support edits.
      *
      * @param options   Options bit set, usually 0. See U_OMIT_UNCHANGED_TEXT and U_EDITS_NO_RESET.
      * @param src       Source UTF-8 string.
      * @param sink      A ByteSink to which the normalized UTF-8 result string is written.
      *                  sink.Flush() is called at the end.
      * @param edits     Records edits for index mapping, working with styled text,
      *                  and getting only changes (if any).
      *                  The Edits contents is undefined if any error occurs.
      *                  This function calls edits->reset() first unless
      *                  options includes U_EDITS_NO_RESET. edits can be nullptr.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @stable ICU 60
      */
     virtual void
     normalizeUTF8(uint32_t options, StringPiece src, ByteSink &sink,
                   Edits *edits, UErrorCode &errorCode) const override;
 
     /**
      * Appends the normalized form of the second string to the first string
      * (merging them at the boundary) and returns the first string.
      * The result is normalized if the first string was normalized.
      * The first and second strings must be different objects.
      * @param first string, should be normalized
      * @param second string, will be normalized
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return first
      * @stable ICU 4.4
      */
     virtual UnicodeString &
     normalizeSecondAndAppend(UnicodeString &first,
                              const UnicodeString &second,
                              UErrorCode &errorCode) const override;
     /**
      * Appends the second string to the first string
      * (merging them at the boundary) and returns the first string.
      * The result is normalized if both the strings were normalized.
      * The first and second strings must be different objects.
      * @param first string, should be normalized
      * @param second string, should be normalized
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return first
      * @stable ICU 4.4
      */
     virtual UnicodeString &
     append(UnicodeString &first,
            const UnicodeString &second,
            UErrorCode &errorCode) const override;
 
     /**
      * Gets the decomposition mapping of c.
      * For details see the base class documentation.
      *
      * This function is independent of the mode of the Normalizer2.
      * @param c code point
      * @param decomposition String object which will be set to c's
      *                      decomposition mapping, if there is one.
      * @return true if c has a decomposition, otherwise false
      * @stable ICU 4.6
      */
     virtual UBool
     getDecomposition(UChar32 c, UnicodeString &decomposition) const override;
 
     /**
      * Gets the raw decomposition mapping of c.
      * For details see the base class documentation.
      *
      * This function is independent of the mode of the Normalizer2.
      * @param c code point
      * @param decomposition String object which will be set to c's
      *                      raw decomposition mapping, if there is one.
      * @return true if c has a decomposition, otherwise false
      * @stable ICU 49
      */
     virtual UBool
     getRawDecomposition(UChar32 c, UnicodeString &decomposition) const override;
 
     /**
      * Performs pairwise composition of a & b and returns the composite if there is one.
      * For details see the base class documentation.
      *
      * This function is independent of the mode of the Normalizer2.
      * @param a A (normalization starter) code point.
      * @param b Another code point.
      * @return The non-negative composite code point if there is one; otherwise a negative value.
      * @stable ICU 49
      */
     virtual UChar32
     composePair(UChar32 a, UChar32 b) const override;
 
     /**
      * Gets the combining class of c.
      * The default implementation returns 0
      * but all standard implementations return the Unicode Canonical_Combining_Class value.
      * @param c code point
      * @return c's combining class
      * @stable ICU 49
      */
     virtual uint8_t
     getCombiningClass(UChar32 c) const override;
 
     /**
      * Tests if the string is normalized.
      * For details see the Normalizer2 base class documentation.
      * @param s input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return true if s is normalized
      * @stable ICU 4.4
      */
     virtual UBool
     isNormalized(const UnicodeString &s, UErrorCode &errorCode) const override;
     /**
      * Tests if the UTF-8 string is normalized.
      * Internally, in cases where the quickCheck() method would return "maybe"
      * (which is only possible for the two COMPOSE modes) this method
      * resolves to "yes" or "no" to provide a definitive result,
      * at the cost of doing more work in those cases.
      *
      * This works for all normalization modes.
      * It is optimized for UTF-8 for all built-in modes except for FCD.
      * The base class implementation converts to UTF-16 and calls isNormalized().
      *
      * @param s UTF-8 input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return true if s is normalized
      * @stable ICU 60
      */
     virtual UBool
     isNormalizedUTF8(StringPiece s, UErrorCode &errorCode) const override;
     /**
      * Tests if the string is normalized.
      * For details see the Normalizer2 base class documentation.
      * @param s input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return UNormalizationCheckResult
      * @stable ICU 4.4
      */
     virtual UNormalizationCheckResult
     quickCheck(const UnicodeString &s, UErrorCode &errorCode) const override;
     /**
      * Returns the end of the normalized substring of the input string.
      * For details see the Normalizer2 base class documentation.
      * @param s input string
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return "yes" span end index
      * @stable ICU 4.4
      */
     virtual int32_t
     spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const override;
 
     /**
      * Tests if the character always has a normalization boundary before it,
      * regardless of context.
      * For details see the Normalizer2 base class documentation.
      * @param c character to test
      * @return true if c has a normalization boundary before it
      * @stable ICU 4.4
      */
     virtual UBool hasBoundaryBefore(UChar32 c) const override;
 
     /**
      * Tests if the character always has a normalization boundary after it,
      * regardless of context.
      * For details see the Normalizer2 base class documentation.
      * @param c character to test
      * @return true if c has a normalization boundary after it
      * @stable ICU 4.4
      */
     virtual UBool hasBoundaryAfter(UChar32 c) const override;
 
     /**
      * Tests if the character is normalization-inert.
      * For details see the Normalizer2 base class documentation.
      * @param c character to test
      * @return true if c is normalization-inert
      * @stable ICU 4.4
      */
     virtual UBool isInert(UChar32 c) const override;
 private:
     UnicodeString &
     normalize(const UnicodeString &src,
               UnicodeString &dest,
               USetSpanCondition spanCondition,
               UErrorCode &errorCode) const;
 
     void
     normalizeUTF8(uint32_t options, const char *src, int32_t length,
                   ByteSink &sink, Edits *edits,
                   USetSpanCondition spanCondition,
                   UErrorCode &errorCode) const;
 
     UnicodeString &
     normalizeSecondAndAppend(UnicodeString &first,
                              const UnicodeString &second,
                              UBool doNormalize,
                              UErrorCode &errorCode) const;
 
     const Normalizer2 &norm2;
     const UnicodeSet &set;
 };
 
 U_NAMESPACE_END
 
 #endif  // !UCONFIG_NO_NORMALIZATION
 
 #endif /* U_SHOW_CPLUSPLUS_API */
 
 #endif  // __NORMALIZER2_H__

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