/usr/include/unicode/appendable.h is in libicu-dev 57.1-6+deb9u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | /*
*******************************************************************************
* Copyright (C) 2011-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* file name: appendable.h
* encoding: US-ASCII
* 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 (UChars).
*/
#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 UChar[] array, a UnicodeSet, or any other object
* that receives and processes characters and/or strings.
*
* Implementation classes must implement at least appendCodeUnit(UChar).
* 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(UChar c) = 0;
/**
* Appends a code point.
* The default implementation calls appendCodeUnit(UChar) 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(UChar) 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 UChar *s, int32_t length);
/**
* Tells the object that the caller is going to append roughly
* appendCapacity UChars. 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 UChars 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 UChars, call appendString() with the
* pointer returned from this function and the number of UChars written.
* Many appendString() implementations will avoid copying UChars if this function
* returned an internal buffer.
*
* Partial usage example:
* \code
* int32_t capacity;
* UChar* buffer = app.getAppendBuffer(..., &capacity);
* ... Write n UChars into buffer, with n <= capacity.
* app.appendString(buffer, n);
* \endcode
* In many implementations, that call to append will avoid copying UChars.
*
* 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 UChar *getAppendBuffer(int32_t minCapacity,
int32_t desiredCapacityHint,
UChar *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(UChar 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 UChar *s, int32_t length);
/**
* Tells the UnicodeString that the caller is going to append roughly
* appendCapacity UChars.
* @param appendCapacity estimated number of UChars 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 UChar *getAppendBuffer(int32_t minCapacity,
int32_t desiredCapacityHint,
UChar *scratch, int32_t scratchCapacity,
int32_t *resultCapacity);
private:
UnicodeString &str;
};
U_NAMESPACE_END
#endif // __APPENDABLE_H__
|