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1 /* | |
2 ****************************************************************************** | |
3 * | |
4 * Copyright (C) 2002-2010, International Business Machines | |
5 * Corporation and others. All Rights Reserved. | |
6 * | |
7 ****************************************************************************** | |
8 * file name: uobject.h | |
9 * encoding: US-ASCII | |
10 * tab size: 8 (not used) | |
11 * indentation:4 | |
12 * | |
13 * created on: 2002jun26 | |
14 * created by: Markus W. Scherer | |
15 */ | |
16 | |
17 #ifndef __UOBJECT_H__ | |
18 #define __UOBJECT_H__ | |
19 | |
20 #include "unicode/utypes.h" | |
21 | |
22 U_NAMESPACE_BEGIN | |
23 | |
24 /** | |
25 * \file | |
26 * \brief C++ API: Common ICU base class UObject. | |
27 */ | |
28 | |
29 /** U_OVERRIDE_CXX_ALLOCATION - Define this to override operator new and | |
30 * delete in UMemory. Enabled by default for ICU. | |
31 * | |
32 * Enabling forces all allocation of ICU object types to use ICU's | |
33 * memory allocation. On Windows, this allows the ICU DLL to be used by | |
34 * applications that statically link the C Runtime library, meaning that | |
35 * the app and ICU will be using different heaps. | |
36 * | |
37 * @stable ICU 2.2 | |
38 */ | |
39 #ifndef U_OVERRIDE_CXX_ALLOCATION | |
40 #define U_OVERRIDE_CXX_ALLOCATION 1 | |
41 #endif | |
42 | |
43 /** | |
44 * \def U_HAVE_PLACEMENT_NEW | |
45 * Define this to define the placement new and | |
46 * delete in UMemory for STL. | |
47 * | |
48 * @stable ICU 2.6 | |
49 */ | |
50 #ifndef U_HAVE_PLACEMENT_NEW | |
51 #define U_HAVE_PLACEMENT_NEW 1 | |
52 #endif | |
53 | |
54 | |
55 /** | |
56 * \def U_HAVE_DEBUG_LOCATION_NEW | |
57 * Define this to define the MFC debug | |
58 * version of the operator new. | |
59 * | |
60 * @stable ICU 3.4 | |
61 */ | |
62 #ifndef U_HAVE_DEBUG_LOCATION_NEW | |
63 #define U_HAVE_DEBUG_LOCATION_NEW 0 | |
64 #endif | |
65 | |
66 /** | |
67 * @{ | |
68 * \def U_NO_THROW | |
69 * Define this to define the throw() specification so | |
70 * certain functions do not throw any exceptions | |
71 * | |
72 * UMemory operator new methods should have the throw() specification | |
73 * appended to them, so that the compiler adds the additional NULL check
| |
74 * before calling constructors. Without, if <code>operator new</code> re
turns NULL the | |
75 * constructor is still called, and if the constructor references member
| |
76 * data, (which it typically does), the result is a segmentation violati
on. | |
77 * | |
78 * @draft ICU 4.2 | |
79 */ | |
80 #ifndef U_NO_THROW | |
81 #define U_NO_THROW throw() | |
82 #endif | |
83 | |
84 /** @} */ | |
85 | |
86 /** | |
87 * UMemory is the common ICU base class. | |
88 * All other ICU C++ classes are derived from UMemory (starting with ICU 2.4). | |
89 * | |
90 * This is primarily to make it possible and simple to override the | |
91 * C++ memory management by adding new/delete operators to this base class. | |
92 * | |
93 * To override ALL ICU memory management, including that from plain C code, | |
94 * replace the allocation functions declared in cmemory.h | |
95 * | |
96 * UMemory does not contain any virtual functions. | |
97 * Common "boilerplate" functions are defined in UObject. | |
98 * | |
99 * @stable ICU 2.4 | |
100 */ | |
101 class U_COMMON_API UMemory { | |
102 public: | |
103 | |
104 /* test versions for debugging shaper heap memory problems */ | |
105 #ifdef SHAPER_MEMORY_DEBUG | |
106 static void * NewArray(int size, int count); | |
107 static void * GrowArray(void * array, int newSize ); | |
108 static void FreeArray(void * array ); | |
109 #endif | |
110 | |
111 #if U_OVERRIDE_CXX_ALLOCATION | |
112 /** | |
113 * Override for ICU4C C++ memory management. | |
114 * simple, non-class types are allocated using the macros in common/cmemory.
h | |
115 * (uprv_malloc(), uprv_free(), uprv_realloc()); | |
116 * they or something else could be used here to implement C++ new/delete | |
117 * for ICU4C C++ classes | |
118 * @stable ICU 2.4 | |
119 */ | |
120 static void * U_EXPORT2 operator new(size_t size) U_NO_THROW; | |
121 | |
122 /** | |
123 * Override for ICU4C C++ memory management. | |
124 * See new(). | |
125 * @stable ICU 2.4 | |
126 */ | |
127 static void * U_EXPORT2 operator new[](size_t size) U_NO_THROW; | |
128 | |
129 /** | |
130 * Override for ICU4C C++ memory management. | |
131 * simple, non-class types are allocated using the macros in common/cmemory.
h | |
132 * (uprv_malloc(), uprv_free(), uprv_realloc()); | |
133 * they or something else could be used here to implement C++ new/delete | |
134 * for ICU4C C++ classes | |
135 * @stable ICU 2.4 | |
136 */ | |
137 static void U_EXPORT2 operator delete(void *p) U_NO_THROW; | |
138 | |
139 /** | |
140 * Override for ICU4C C++ memory management. | |
141 * See delete(). | |
142 * @stable ICU 2.4 | |
143 */ | |
144 static void U_EXPORT2 operator delete[](void *p) U_NO_THROW; | |
145 | |
146 #if U_HAVE_PLACEMENT_NEW | |
147 /** | |
148 * Override for ICU4C C++ memory management for STL. | |
149 * See new(). | |
150 * @stable ICU 2.6 | |
151 */ | |
152 static inline void * U_EXPORT2 operator new(size_t, void *ptr) U_NO_THROW {
return ptr; } | |
153 | |
154 /** | |
155 * Override for ICU4C C++ memory management for STL. | |
156 * See delete(). | |
157 * @stable ICU 2.6 | |
158 */ | |
159 static inline void U_EXPORT2 operator delete(void *, void *) U_NO_THROW {} | |
160 #endif /* U_HAVE_PLACEMENT_NEW */ | |
161 #if U_HAVE_DEBUG_LOCATION_NEW | |
162 /** | |
163 * This method overrides the MFC debug version of the operator new | |
164 * | |
165 * @param size The requested memory size | |
166 * @param file The file where the allocation was requested | |
167 * @param line The line where the allocation was requested | |
168 */ | |
169 static void * U_EXPORT2 operator new(size_t size, const char* file, int line
) U_NO_THROW; | |
170 /** | |
171 * This method provides a matching delete for the MFC debug new | |
172 * | |
173 * @param p The pointer to the allocated memory | |
174 * @param file The file where the allocation was requested | |
175 * @param line The line where the allocation was requested | |
176 */ | |
177 static void U_EXPORT2 operator delete(void* p, const char* file, int line) U
_NO_THROW; | |
178 #endif /* U_HAVE_DEBUG_LOCATION_NEW */ | |
179 #endif /* U_OVERRIDE_CXX_ALLOCATION */ | |
180 | |
181 /* | |
182 * Assignment operator not declared. The compiler will provide one | |
183 * which does nothing since this class does not contain any data members. | |
184 * API/code coverage may show the assignment operator as present and | |
185 * untested - ignore. | |
186 * Subclasses need this assignment operator if they use compiler-provided | |
187 * assignment operators of their own. An alternative to not declaring one | |
188 * here would be to declare and empty-implement a protected or public one. | |
189 UMemory &UMemory::operator=(const UMemory &); | |
190 */ | |
191 }; | |
192 | |
193 /** | |
194 * UObject is the common ICU "boilerplate" class. | |
195 * UObject inherits UMemory (starting with ICU 2.4), | |
196 * and all other public ICU C++ classes | |
197 * are derived from UObject (starting with ICU 2.2). | |
198 * | |
199 * UObject contains common virtual functions like for ICU's "poor man's RTTI". | |
200 * It does not contain default implementations of virtual methods | |
201 * like getDynamicClassID to allow derived classes such as Format | |
202 * to declare these as pure virtual. | |
203 * | |
204 * The clone() function is not available in UObject because it is not | |
205 * implemented by all ICU classes. | |
206 * Many ICU services provide a clone() function for their class trees, | |
207 * defined on the service's C++ base class, and all subclasses within that | |
208 * service class tree return a pointer to the service base class | |
209 * (which itself is a subclass of UObject). | |
210 * This is because some compilers do not support covariant (same-as-this) | |
211 * return types; cast to the appropriate subclass if necessary. | |
212 * | |
213 * @stable ICU 2.2 | |
214 */ | |
215 class U_COMMON_API UObject : public UMemory { | |
216 public: | |
217 /** | |
218 * Destructor. | |
219 * | |
220 * @stable ICU 2.2 | |
221 */ | |
222 virtual ~UObject(); | |
223 | |
224 /** | |
225 * ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class. | |
226 * | |
227 * @stable ICU 2.2 | |
228 */ | |
229 virtual UClassID getDynamicClassID() const = 0; | |
230 | |
231 protected: | |
232 // the following functions are protected to prevent instantiation and | |
233 // direct use of UObject itself | |
234 | |
235 // default constructor | |
236 // commented out because UObject is abstract (see getDynamicClassID) | |
237 // inline UObject() {} | |
238 | |
239 // copy constructor | |
240 // commented out because UObject is abstract (see getDynamicClassID) | |
241 // inline UObject(const UObject &other) {} | |
242 | |
243 #if 0 | |
244 // TODO Sometime in the future. Implement operator==(). | |
245 // (This comment inserted in 2.2) | |
246 // some or all of the following "boilerplate" functions may be made public | |
247 // in a future ICU4C release when all subclasses implement them | |
248 | |
249 // assignment operator | |
250 // (not virtual, see "Taligent's Guide to Designing Programs" pp.73..74) | |
251 // commented out because the implementation is the same as a compiler's defa
ult | |
252 // UObject &operator=(const UObject &other) { return *this; } | |
253 | |
254 // comparison operators | |
255 virtual inline UBool operator==(const UObject &other) const { return this==&
other; } | |
256 inline UBool operator!=(const UObject &other) const { return !operator==(oth
er); } | |
257 | |
258 // clone() commented out from the base class: | |
259 // some compilers do not support co-variant return types | |
260 // (i.e., subclasses would have to return UObject * as well, instead of SubC
lass *) | |
261 // see also UObject class documentation. | |
262 // virtual UObject *clone() const; | |
263 #endif | |
264 | |
265 /* | |
266 * Assignment operator not declared. The compiler will provide one | |
267 * which does nothing since this class does not contain any data members. | |
268 * API/code coverage may show the assignment operator as present and | |
269 * untested - ignore. | |
270 * Subclasses need this assignment operator if they use compiler-provided | |
271 * assignment operators of their own. An alternative to not declaring one | |
272 * here would be to declare and empty-implement a protected or public one. | |
273 UObject &UObject::operator=(const UObject &); | |
274 */ | |
275 | |
276 // Future implementation for RTTI that support subtyping. [alan] | |
277 // | |
278 // public: | |
279 // /** | |
280 // * @internal | |
281 // */ | |
282 // static UClassID getStaticClassID(); | |
283 // | |
284 // /** | |
285 // * @internal | |
286 // */ | |
287 // UBool instanceOf(UClassID type) const; | |
288 }; | |
289 | |
290 /** | |
291 * This is a simple macro to add ICU RTTI to an ICU object implementation. | |
292 * This does not go into the header. This should only be used in *.cpp files. | |
293 * | |
294 * @param myClass The name of the class that needs RTTI defined. | |
295 * @internal | |
296 */ | |
297 #define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass) \ | |
298 UClassID U_EXPORT2 myClass::getStaticClassID() { \ | |
299 static char classID = 0; \ | |
300 return (UClassID)&classID; \ | |
301 } \ | |
302 UClassID myClass::getDynamicClassID() const \ | |
303 { return myClass::getStaticClassID(); } | |
304 | |
305 | |
306 /** | |
307 * This macro adds ICU RTTI to an ICU abstract class implementation. | |
308 * This macro should be invoked in *.cpp files. The corresponding | |
309 * header should declare getStaticClassID. | |
310 * | |
311 * @param myClass The name of the class that needs RTTI defined. | |
312 * @internal | |
313 */ | |
314 #define UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass) \ | |
315 UClassID U_EXPORT2 myClass::getStaticClassID() { \ | |
316 static char classID = 0; \ | |
317 return (UClassID)&classID; \ | |
318 } | |
319 | |
320 /** | |
321 * This is a simple macro to express that a class and its subclasses do not offe
r | |
322 * ICU's "poor man's RTTI". | |
323 * Beginning with ICU 4.6, ICU requires C++ compiler RTTI. | |
324 * This does not go into the header. This should only be used in *.cpp files. | |
325 * Use this with a private getDynamicClassID() in an immediate subclass of UObje
ct. | |
326 * | |
327 * @param myClass The name of the class that needs RTTI defined. | |
328 * @internal | |
329 */ | |
330 #define UOBJECT_DEFINE_NO_RTTI_IMPLEMENTATION(myClass) \ | |
331 UClassID myClass::getDynamicClassID() const { return NULL; } | |
332 | |
333 // /** | |
334 // * This macro adds ICU RTTI to an ICU concrete class implementation. | |
335 // * This macro should be invoked in *.cpp files. The corresponding | |
336 // * header should declare getDynamicClassID and getStaticClassID. | |
337 // * | |
338 // * @param myClass The name of the class that needs RTTI defined. | |
339 // * @param myParent The name of the myClass's parent. | |
340 // * @internal | |
341 // */ | |
342 /*#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass, myParent) \ | |
343 UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass, myParent) \ | |
344 UClassID myClass::getDynamicClassID() const { \ | |
345 return myClass::getStaticClassID(); \ | |
346 } | |
347 */ | |
348 | |
349 | |
350 U_NAMESPACE_END | |
351 | |
352 #endif | |
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