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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-*******************************************************************************
-*   Copyright (C) 2011-2012, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-*******************************************************************************
-*   file name:  appendable.h
-*   encoding:   UTF-8
-*   tab size:   8 (not used)
-*   indentation:4
-*
-*   created on: 2010dec07
-*   created by: Markus W. Scherer
-*/
-
-#ifndef __APPENDABLE_H__
-#define __APPENDABLE_H__
-
-/**
- * \file
- * \brief C++ API: Appendable class: Sink for Unicode code points and 16-bit code units (char16_ts).
- */
-
-#include "unicode/utypes.h"
-#include "unicode/uobject.h"
-
-U_NAMESPACE_BEGIN
-
-class UnicodeString;
-
-/**
- * Base class for objects to which Unicode characters and strings can be appended.
- * Combines elements of Java Appendable and ICU4C ByteSink.
- *
- * This class can be used in APIs where it does not matter whether the actual destination is
- * a UnicodeString, a char16_t[] array, a UnicodeSet, or any other object
- * that receives and processes characters and/or strings.
- *
- * Implementation classes must implement at least appendCodeUnit(char16_t).
- * The base class provides default implementations for the other methods.
- *
- * The methods do not take UErrorCode parameters.
- * If an error occurs (e.g., out-of-memory),
- * in addition to returning FALSE from failing operations,
- * the implementation must prevent unexpected behavior (e.g., crashes)
- * from further calls and should make the error condition available separately
- * (e.g., store a UErrorCode, make/keep a UnicodeString bogus).
- * @stable ICU 4.8
- */
-class U_COMMON_API Appendable : public UObject {
-public:
-    /**
-     * Destructor.
-     * @stable ICU 4.8
-     */
-    ~Appendable();
-
-    /**
-     * Appends a 16-bit code unit.
-     * @param c code unit
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool appendCodeUnit(char16_t c) = 0;
-
-    /**
-     * Appends a code point.
-     * The default implementation calls appendCodeUnit(char16_t) once or twice.
-     * @param c code point 0..0x10ffff
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool appendCodePoint(UChar32 c);
-
-    /**
-     * Appends a string.
-     * The default implementation calls appendCodeUnit(char16_t) for each code unit.
-     * @param s string, must not be NULL if length!=0
-     * @param length string length, or -1 if NUL-terminated
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool appendString(const char16_t *s, int32_t length);
-
-    /**
-     * Tells the object that the caller is going to append roughly
-     * appendCapacity char16_ts. A subclass might use this to pre-allocate
-     * a larger buffer if necessary.
-     * The default implementation does nothing. (It always returns TRUE.)
-     * @param appendCapacity estimated number of char16_ts that will be appended
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool reserveAppendCapacity(int32_t appendCapacity);
-
-    /**
-     * Returns a writable buffer for appending and writes the buffer's capacity to
-     * *resultCapacity. Guarantees *resultCapacity>=minCapacity.
-     * May return a pointer to the caller-owned scratch buffer which must have
-     * scratchCapacity>=minCapacity.
-     * The returned buffer is only valid until the next operation
-     * on this Appendable.
-     *
-     * After writing at most *resultCapacity char16_ts, call appendString() with the
-     * pointer returned from this function and the number of char16_ts written.
-     * Many appendString() implementations will avoid copying char16_ts if this function
-     * returned an internal buffer.
-     *
-     * Partial usage example:
-     * \code
-     *  int32_t capacity;
-     *  char16_t* buffer = app.getAppendBuffer(..., &capacity);
-     *  ... Write n char16_ts into buffer, with n <= capacity.
-     *  app.appendString(buffer, n);
-     * \endcode
-     * In many implementations, that call to append will avoid copying char16_ts.
-     *
-     * If the Appendable allocates or reallocates an internal buffer, it should use
-     * the desiredCapacityHint if appropriate.
-     * If a caller cannot provide a reasonable guess at the desired capacity,
-     * it should pass desiredCapacityHint=0.
-     *
-     * If a non-scratch buffer is returned, the caller may only pass
-     * a prefix to it to appendString().
-     * That is, it is not correct to pass an interior pointer to appendString().
-     *
-     * The default implementation always returns the scratch buffer.
-     *
-     * @param minCapacity required minimum capacity of the returned buffer;
-     *                    must be non-negative
-     * @param desiredCapacityHint desired capacity of the returned buffer;
-     *                            must be non-negative
-     * @param scratch default caller-owned buffer
-     * @param scratchCapacity capacity of the scratch buffer
-     * @param resultCapacity pointer to an integer which will be set to the
-     *                       capacity of the returned buffer
-     * @return a buffer with *resultCapacity>=minCapacity
-     * @stable ICU 4.8
-     */
-    virtual char16_t *getAppendBuffer(int32_t minCapacity,
-                                   int32_t desiredCapacityHint,
-                                   char16_t *scratch, int32_t scratchCapacity,
-                                   int32_t *resultCapacity);
-};
-
-/**
- * An Appendable implementation which writes to a UnicodeString.
- *
- * This class is not intended for public subclassing.
- * @stable ICU 4.8
- */
-class U_COMMON_API UnicodeStringAppendable : public Appendable {
-public:
-    /**
-     * Aliases the UnicodeString (keeps its reference) for writing.
-     * @param s The UnicodeString to which this Appendable will write.
-     * @stable ICU 4.8
-     */
-    explicit UnicodeStringAppendable(UnicodeString &s) : str(s) {}
-
-    /**
-     * Destructor.
-     * @stable ICU 4.8
-     */
-    ~UnicodeStringAppendable();
-
-    /**
-     * Appends a 16-bit code unit to the string.
-     * @param c code unit
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool appendCodeUnit(char16_t c);
-
-    /**
-     * Appends a code point to the string.
-     * @param c code point 0..0x10ffff
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool appendCodePoint(UChar32 c);
-
-    /**
-     * Appends a string to the UnicodeString.
-     * @param s string, must not be NULL if length!=0
-     * @param length string length, or -1 if NUL-terminated
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool appendString(const char16_t *s, int32_t length);
-
-    /**
-     * Tells the UnicodeString that the caller is going to append roughly
-     * appendCapacity char16_ts.
-     * @param appendCapacity estimated number of char16_ts that will be appended
-     * @return TRUE if the operation succeeded
-     * @stable ICU 4.8
-     */
-    virtual UBool reserveAppendCapacity(int32_t appendCapacity);
-
-    /**
-     * Returns a writable buffer for appending and writes the buffer's capacity to
-     * *resultCapacity. Guarantees *resultCapacity>=minCapacity.
-     * May return a pointer to the caller-owned scratch buffer which must have
-     * scratchCapacity>=minCapacity.
-     * The returned buffer is only valid until the next write operation
-     * on the UnicodeString.
-     *
-     * For details see Appendable::getAppendBuffer().
-     *
-     * @param minCapacity required minimum capacity of the returned buffer;
-     *                    must be non-negative
-     * @param desiredCapacityHint desired capacity of the returned buffer;
-     *                            must be non-negative
-     * @param scratch default caller-owned buffer
-     * @param scratchCapacity capacity of the scratch buffer
-     * @param resultCapacity pointer to an integer which will be set to the
-     *                       capacity of the returned buffer
-     * @return a buffer with *resultCapacity>=minCapacity
-     * @stable ICU 4.8
-     */
-    virtual char16_t *getAppendBuffer(int32_t minCapacity,
-                                   int32_t desiredCapacityHint,
-                                   char16_t *scratch, int32_t scratchCapacity,
-                                   int32_t *resultCapacity);
-
-private:
-    UnicodeString &str;
-};
-
-U_NAMESPACE_END
-
-#endif  // __APPENDABLE_H__