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1/////////////////////////////////////////////////////////////////////////////
2// Name: dynarray.h
3// Purpose: interface of wxArray<T>
4// Author: wxWidgets team
5// RCS-ID: $Id$
6// Licence: wxWindows license
7/////////////////////////////////////////////////////////////////////////////
8
9/**
10
11 This section describes the so called @e "dynamic arrays". This is a C
12 array-like type safe data structure i.e. the member access time is constant
13 (and not linear according to the number of container elements as for linked
14 lists). However, these arrays are dynamic in the sense that they will
15 automatically allocate more memory if there is not enough of it for adding
16 a new element. They also perform range checking on the index values but in
17 debug mode only, so please be sure to compile your application in debug
18 mode to use it (see @ref overview_debugging for details). So, unlike the
19 arrays in some other languages, attempt to access an element beyond the
20 arrays bound doesn't automatically expand the array but provokes an
21 assertion failure instead in debug build and does nothing (except possibly
22 crashing your program) in the release build.
23
24 The array classes were designed to be reasonably efficient, both in terms
25 of run-time speed and memory consumption and the executable size. The speed
26 of array item access is, of course, constant (independent of the number of
27 elements) making them much more efficient than linked lists (wxList).
28 Adding items to the arrays is also implemented in more or less constant
29 time, but the price is preallocating the memory in advance. In the
30 "memory management" function section, you may find some useful hints about
31 optimizing wxArray memory usage. As for executable size, all wxArray
32 functions are inline, so they do not take @e any space at all.
33
34 wxWidgets has three different kinds of array. All of them derive from
35 wxBaseArray class which works with untyped data and can not be used
36 directly. The standard macros WX_DEFINE_ARRAY(), WX_DEFINE_SORTED_ARRAY()
37 and WX_DEFINE_OBJARRAY() are used to define a new class deriving from it.
38 The classes declared will be called in this documentation wxArray,
39 wxSortedArray and wxObjArray but you should keep in mind that no classes
40 with such names actually exist, each time you use one of the
41 WX_DEFINE_XXXARRAY() macros, you define a class with a new name. In fact,
42 these names are "template" names and each usage of one of the macros
43 mentioned above creates a template specialization for the given element
44 type.
45
46 wxArray is suitable for storing integer types and pointers which it does
47 not treat as objects in any way, i.e. the element pointed to by the pointer
48 is not deleted when the element is removed from the array. It should be
49 noted that all of wxArray's functions are inline, so it costs strictly
50 nothing to define as many array types as you want (either in terms of the
51 executable size or the speed) as long as at least one of them is defined
52 and this is always the case because wxArrays are used by wxWidgets
53 internally. This class has one serious limitation: it can only be used for
54 storing integral types (bool, char, short, int, long and their unsigned
55 variants) or pointers (of any kind). An attempt to use with objects of
56 @c sizeof() greater than @c sizeof(long) will provoke a runtime assertion
57 failure, however declaring a wxArray of floats will not (on the machines
58 where @c "sizeof(float) <= sizeof(long)"), yet it will @b not work, please
59 use wxObjArray for storing floats and doubles.
60
61 wxSortedArray is a wxArray variant which should be used when searching in
62 the array is a frequently used operation. It requires you to define an
63 additional function for comparing two elements of the array element type
64 and always stores its items in the sorted order (according to this
65 function). Thus, its Index() function execution time is @c "O(log(N))"
66 instead of @c "O(N)" for the usual arrays but the Add() method is slower:
67 it is @c "O(log(N))" instead of constant time (neglecting time spent in
68 memory allocation routine). However, in a usual situation elements are
69 added to an array much less often than searched inside it, so wxSortedArray
70 may lead to huge performance improvements compared to wxArray. Finally, it
71 should be noticed that, as wxArray, wxSortedArray can be only used for
72 storing integral types or pointers.
73
74 wxObjArray class treats its elements like "objects". It may delete them
75 when they are removed from the array (invoking the correct destructor) and
76 copies them using the objects copy constructor. In order to implement this
77 behaviour the definition of the wxObjArray arrays is split in two parts:
78 first, you should declare the new wxObjArray class using the
79 WX_DECLARE_OBJARRAY() macro and then you must include the file defining the
80 implementation of template type: @<wx/arrimpl.cpp@> and define the array
81 class with the WX_DEFINE_OBJARRAY() macro from a point where the full (as
82 opposed to 'forward') declaration of the array elements class is in scope.
83 As it probably sounds very complicated here is an example:
84
85 @code
86 #include <wx/dynarray.h>
87
88 // We must forward declare the array because it is used
89 // inside the class declaration.
90 class MyDirectory;
91 class MyFile;
92
93 // This defines two new types: ArrayOfDirectories and ArrayOfFiles which
94 // can be now used as shown below.
95 WX_DECLARE_OBJARRAY(MyDirectory, ArrayOfDirectories);
96 WX_DECLARE_OBJARRAY(MyFile, ArrayOfFiles);
97
98 class MyDirectory
99 {
100 // ...
101 ArrayOfDirectories m_subdirectories; // All subdirectories
102 ArrayOfFiles m_files; // All files in this directory
103 };
104
105 // ...
106
107 // Now that we have MyDirectory declaration in scope we may finish the
108 // definition of ArrayOfDirectories -- note that this expands into some C++
109 // code and so should only be compiled once (i.e., don't put this in the
110 // header, but into a source file or you will get linking errors)
111 #include <wx/arrimpl.cpp> // This is a magic incantation which must be done!
112 WX_DEFINE_OBJARRAY(ArrayOfDirectories);
113
114 // that's all!
115 @endcode
116
117 It is not as elegant as writing this:
118
119 @code
120 typedef std::vector<MyDirectory> ArrayOfDirectories;
121 @endcode
122
123 But is not that complicated and allows the code to be compiled with any,
124 however dumb, C++ compiler in the world.
125
126 Remember to include @<wx/arrimpl.cpp@> just before each
127 WX_DEFINE_OBJARRAY() ocurrence in your code, even if you have several in
128 the same file.
129
130 Things are much simpler for wxArray and wxSortedArray however: it is enough
131 just to write:
132
133 @code
134 WX_DEFINE_ARRAY_INT(int, ArrayOfInts);
135 WX_DEFINE_SORTED_ARRAY_INT(int, ArrayOfSortedInts);
136 @endcode
137
138 There is only one @c DEFINE macro and no need for separate @c DECLARE one.
139 For the arrays of the primitive types, the macros
140 @c WX_DEFINE_ARRAY_CHAR/SHORT/INT/SIZE_T/LONG/DOUBLE should be used
141 depending on the sizeof of the values (notice that storing values of
142 smaller type, e.g. shorts, in an array of larger one, e.g. @c ARRAY_INT,
143 does not work on all architectures!).
144
145
146 @section array_macros Macros for Template Array Definition
147
148 To use an array you must first define the array class. This is done with
149 the help of the macros in this section. The class of array elements must be
150 (at least) forward declared for WX_DEFINE_ARRAY(), WX_DEFINE_SORTED_ARRAY()
151 and WX_DECLARE_OBJARRAY() macros and must be fully declared before you use
152 WX_DEFINE_OBJARRAY() macro.
153
154 - WX_DEFINE_ARRAY()
155 - WX_DEFINE_EXPORTED_ARRAY()
156 - WX_DEFINE_USER_EXPORTED_ARRAY()
157 - WX_DEFINE_SORTED_ARRAY()
158 - WX_DEFINE_SORTED_EXPORTED_ARRAY()
159 - WX_DEFINE_SORTED_USER_EXPORTED_ARRAY()
160 - WX_DECLARE_EXPORTED_OBJARRAY()
161 - WX_DECLARE_USER_EXPORTED_OBJARRAY()
162 - WX_DEFINE_OBJARRAY()
163 - WX_DEFINE_EXPORTED_OBJARRAY()
164 - WX_DEFINE_USER_EXPORTED_OBJARRAY()
165
166 To slightly complicate the matters even further, the operator "->" defined
167 by default for the array iterators by these macros only makes sense if the
168 array element type is not a pointer itself and, although it still works,
169 this provokes warnings from some compilers and to avoid them you should use
170 the @c _PTR versions of the macros above. For example, to define an array
171 of pointers to @c double you should use:
172
173 @code
174 WX_DEFINE_ARRAY_PTR(double *, MyArrayOfDoublePointers);
175 @endcode
176
177 Note that the above macros are generally only useful for wxObject types.
178 There are separate macros for declaring an array of a simple type, such as
179 an int.
180
181 The following simple types are supported:
182 - @c int
183 - @c long
184 - @c size_t
185 - @c double
186
187 To create an array of a simple type, simply append the type you want in
188 CAPS to the array definition.
189
190 For example, you'd use one of the following variants for an integer array:
191
192 - WX_DEFINE_ARRAY_INT()
193 - WX_DEFINE_EXPORTED_ARRAY_INT()
194 - WX_DEFINE_USER_EXPORTED_ARRAY_INT()
195 - WX_DEFINE_SORTED_ARRAY_INT()
196 - WX_DEFINE_SORTED_EXPORTED_ARRAY_INT()
197 - WX_DEFINE_SORTED_USER_EXPORTED_ARRAY_INT()
198
199
200 @section array_predef Predefined array types
201
202 wxWidgets defines the following dynamic array types:
203 - ::wxArrayShort
204 - ::wxArrayInt
205 - ::wxArrayDouble
206 - ::wxArrayLong
207 - ::wxArrayPtrVoid
208
209 To use them you don't need any macro; you just need to include @c dynarray.h.
210
211
212 @library{wxbase}
213 @category{containers}
214
215 @see @ref overview_container, wxList<T>, wxVector<T>
216*/
217template <typename T>
218class wxArray<T>
219{
220public:
221 /**
222 @name Constructors and Destructors
223
224 Array classes are 100% C++ objects and as such they have the
225 appropriate copy constructors and assignment operators. Copying wxArray
226 just copies the elements but copying wxObjArray copies the arrays
227 items. However, for memory-efficiency sake, neither of these classes
228 has virtual destructor. It is not very important for wxArray which has
229 trivial destructor anyhow, but it does mean that you should avoid
230 deleting wxObjArray through a wxBaseArray pointer (as you would never
231 use wxBaseArray anyhow it shouldn't be a problem) and that you should
232 not derive your own classes from the array classes.
233 */
234 //@{
235
236 /**
237 Default constructor.
238 */
239 wxArray();
240
241 /**
242 Default constructor initializes an empty array object.
243 */
244 wxObjArray();
245
246 /**
247 There is no default constructor for wxSortedArray classes - you must
248 initialize it with a function to use for item comparison. It is a
249 function which is passed two arguments of type @c T where @c T is the
250 array element type and which should return a negative, zero or positive
251 value according to whether the first element passed to it is less than,
252 equal to or greater than the second one.
253 */
254 wxSortedArray(int (*)(T first, T second)compareFunction);
255
256 /**
257 Performs a shallow array copy (i.e. doesn't copy the objects pointed to
258 even if the source array contains the items of pointer type).
259 */
260 wxArray(const wxArray& array);
261
262 /**
263 Performs a shallow array copy (i.e. doesn't copy the objects pointed to
264 even if the source array contains the items of pointer type).
265 */
266 wxSortedArray(const wxSortedArray& array);
267
268 /**
269 Performs a deep copy (i.e. the array element are copied too).
270 */
271 wxObjArray(const wxObjArray& array);
272
273 /**
274 Performs a shallow array copy (i.e. doesn't copy the objects pointed to
275 even if the source array contains the items of pointer type).
276 */
277 wxArray& operator=(const wxArray& array);
278
279 /**
280 Performs a shallow array copy (i.e. doesn't copy the objects pointed to
281 even if the source array contains the items of pointer type).
282 */
283 wxSortedArray& operator=(const wxSortedArray& array);
284
285 /**
286 Performs a deep copy (i.e. the array element are copied too).
287 */
288 wxObjArray& operator=(const wxObjArray& array);
289
290 /**
291 This destructor does not delete all the items owned by the array, you
292 may use the WX_CLEAR_ARRAY() macro for this.
293 */
294 ~wxArray();
295
296 /**
297 This destructor does not delete all the items owned by the array, you
298 may use the WX_CLEAR_ARRAY() macro for this.
299 */
300 ~wxSortedArray();
301
302 /**
303 This destructor deletes all the items owned by the array.
304 */
305 ~wxObjArray();
306
307 //@}
308
309
310 /**
311 @name Memory Management
312
313 Automatic array memory management is quite trivial: the array starts by
314 preallocating some minimal amount of memory (defined by
315 @c WX_ARRAY_DEFAULT_INITIAL_SIZE) and when further new items exhaust
316 already allocated memory it reallocates it adding 50% of the currently
317 allocated amount, but no more than some maximal number which is defined
318 by the @c ARRAY_MAXSIZE_INCREMENT constant. Of course, this may lead to
319 some memory being wasted (@c ARRAY_MAXSIZE_INCREMENT in the worst case,
320 i.e. 4Kb in the current implementation), so the Shrink() function is
321 provided to deallocate the extra memory. The Alloc() function can also
322 be quite useful if you know in advance how many items you are going to
323 put in the array and will prevent the array code from reallocating the
324 memory more times than needed.
325 */
326 //@{
327
328 /**
329 Preallocates memory for a given number of array elements. It is worth
330 calling when the number of items which are going to be added to the
331 array is known in advance because it will save unneeded memory
332 reallocation. If the array already has enough memory for the given
333 number of items, nothing happens. In any case, the existing contents of
334 the array is not modified.
335 */
336 void Alloc(size_t count);
337
338 /**
339 Frees all memory unused by the array. If the program knows that no new
340 items will be added to the array it may call Shrink() to reduce its
341 memory usage. However, if a new item is added to the array, some extra
342 memory will be allocated again.
343 */
344 void Shrink();
345
346 //@}
347
348
349 /**
350 @name Number of Elements and Simple Item Access
351
352 Functions in this section return the total number of array elements and
353 allow to retrieve them - possibly using just the C array indexing []
354 operator which does exactly the same as the Item() method.
355 */
356 //@{
357
358 /**
359 Return the number of items in the array.
360 */
361 size_t GetCount() const;
362
363 /**
364 Returns @true if the array is empty, @false otherwise.
365 */
366 bool IsEmpty() const;
367
368 /**
369 Returns the item at the given position in the array. If @a index is out
370 of bounds, an assert failure is raised in the debug builds but nothing
371 special is done in the release build.
372
373 The returned value is of type "reference to the array element type" for
374 all of the array classes.
375 */
376 T& Item(size_t index) const;
377
378 /**
379 Returns the last element in the array, i.e. is the same as calling
380 "Item(GetCount() - 1)". An assert failure is raised in the debug mode
381 if the array is empty.
382
383 The returned value is of type "reference to the array element type" for
384 all of the array classes.
385 */
386 T& Last() const;
387
388 //@}
389
390
391 /**
392 @name Adding Items
393 */
394 //@{
395
396 /**
397 Appends the given number of @a copies of the @a item to the array
398 consisting of the elements of type @c T.
399
400 This version is used with wxArray.
401
402 You may also use WX_APPEND_ARRAY() macro to append all elements of one
403 array to another one but it is more efficient to use the @a copies
404 parameter and modify the elements in place later if you plan to append
405 a lot of items.
406 */
407 void Add(T item, size_t copies = 1);
408
409 /**
410 Appends the @a item to the array consisting of the elements of type
411 @c T.
412
413 This version is used with wxSortedArray, returning the index where
414 @a item is stored.
415 */
416 size_t Add(T item);
417
418 /**
419 Appends the @a item to the array consisting of the elements of type
420 @c T.
421
422 This version is used with wxObjArray. The array will take ownership of
423 the @a item, deleting it when the item is deleted from the array. Note
424 that you cannot append more than one pointer as reusing it would lead
425 to deleting it twice (or more) resulting in a crash.
426
427 You may also use WX_APPEND_ARRAY() macro to append all elements of one
428 array to another one but it is more efficient to use the @a copies
429 parameter and modify the elements in place later if you plan to append
430 a lot of items.
431 */
432 void Add(T* item);
433
434 /**
435 Appends the given number of @a copies of the @a item to the array
436 consisting of the elements of type @c T.
437
438 This version is used with wxObjArray. The array will make a copy of the
439 item and will not take ownership of the original item.
440
441 You may also use WX_APPEND_ARRAY() macro to append all elements of one
442 array to another one but it is more efficient to use the @a copies
443 parameter and modify the elements in place later if you plan to append
444 a lot of items.
445 */
446 void Add(T& item, size_t copies = 1);
447
448 /**
449 Inserts the given @a item into the array in the specified @e index
450 position.
451
452 Be aware that you will set out the order of the array if you give a
453 wrong position.
454
455 This function is useful in conjunction with IndexForInsert() for a
456 common operation of "insert only if not found".
457 */
458 void AddAt(T item, size_t index);
459
460 /**
461 Insert the given number of @a copies of the @a item into the array
462 before the existing item @a n - thus, @e Insert(something, 0u) will
463 insert an item in such way that it will become the first array element.
464
465 wxSortedArray doesn't have this function because inserting in wrong
466 place would break its sorted condition.
467
468 Please see Add() for an explanation of the differences between the
469 overloaded versions of this function.
470 */
471 void Insert(T item, size_t n, size_t copies = 1);
472
473 /**
474 Insert the @a item into the array before the existing item @a n - thus,
475 @e Insert(something, 0u) will insert an item in such way that it will
476 become the first array element.
477
478 wxSortedArray doesn't have this function because inserting in wrong
479 place would break its sorted condition.
480
481 Please see Add() for an explanation of the differences between the
482 overloaded versions of this function.
483 */
484 void Insert(T* item, size_t n);
485
486 /**
487 Insert the given number of @a copies of the @a item into the array
488 before the existing item @a n - thus, @e Insert(something, 0u) will
489 insert an item in such way that it will become the first array element.
490
491 wxSortedArray doesn't have this function because inserting in wrong
492 place would break its sorted condition.
493
494 Please see Add() for an explanation of the differences between the
495 overloaded versions of this function.
496 */
497 void Insert(T& item, size_t n, size_t copies = 1);
498
499 /**
500 This function ensures that the number of array elements is at least
501 @a count. If the array has already @a count or more items, nothing is
502 done. Otherwise, @a count - GetCount() elements are added and
503 initialized to the value @a defval.
504
505 @see GetCount()
506 */
507 void SetCount(size_t count, T defval = T(0));
508
509 //@}
510
511
512 /**
513 @name Removing Items
514 */
515 //@{
516
517 /**
518 This function does the same as Empty() and additionally frees the
519 memory allocated to the array.
520 */
521 void Clear();
522
523 /**
524 Removes the element from the array, but unlike Remove(), it doesn't
525 delete it. The function returns the pointer to the removed element.
526 */
527 T* Detach(size_t index);
528
529 /**
530 Empties the array. For wxObjArray classes, this destroys all of the
531 array elements. For wxArray and wxSortedArray this does nothing except
532 marking the array of being empty - this function does not free the
533 allocated memory, use Clear() for this.
534 */
535 void Empty();
536
537 /**
538 Removes an element from the array by value: the first item of the array
539 equal to @a item is removed, an assert failure will result from an
540 attempt to remove an item which doesn't exist in the array.
541
542 When an element is removed from wxObjArray it is deleted by the array -
543 use Detach() if you don't want this to happen. On the other hand, when
544 an object is removed from a wxArray nothing happens - you should delete
545 it manually if required:
546
547 @code
548 T *item = array[n];
549 array.Remove(item);
550 delete item;
551 @endcode
552
553 See also WX_CLEAR_ARRAY() macro which deletes all elements of a wxArray
554 (supposed to contain pointers).
555
556 @see RemoveAt()
557 */
558 void Remove(T item);
559
560 /**
561 Removes @a count elements starting at @a index from the array. When an
562 element is removed from wxObjArray it is deleted by the array - use
563 Detach() if you don't want this to happen. On the other hand, when an
564 object is removed from a wxArray nothing happens - you should delete it
565 manually if required:
566
567 @code
568 T *item = array[n];
569 delete item;
570 array.RemoveAt(n);
571 @endcode
572
573 See also WX_CLEAR_ARRAY() macro which deletes all elements of a wxArray
574 (supposed to contain pointers).
575 */
576 void RemoveAt(size_t index, size_t count = 1);
577
578 //@}
579
580
581 /**
582 @name Searching and Sorting
583 */
584 //@{
585
586 /**
587 This version of Index() is for wxArray and wxObjArray only.
588
589 Searches the element in the array, starting from either beginning or
590 the end depending on the value of @a searchFromEnd parameter.
591 @c wxNOT_FOUND is returned if the element is not found, otherwise the
592 index of the element is returned.
593
594 @note Even for wxObjArray classes, the operator "==" of the elements in
595 the array is @b not used by this function. It searches exactly
596 the given element in the array and so will only succeed if this
597 element had been previously added to the array, but fail even if
598 another, identical, element is in the array.
599 */
600 int Index(T& item, bool searchFromEnd = false) const;
601
602 /**
603 This version of Index() is for wxSortedArray only.
604
605 Searches the element in the array, starting from either beginning or
606 the end depending on the value of @a searchFromEnd parameter.
607 @c wxNOT_FOUND is returned if the element is not found, otherwise the
608 index of the element is returned.
609 */
610 int Index(T& item) const;
611
612 /**
613 Search for a place to insert @a item into the sorted array (binary
614 search). The index returned is just before the first existing item that
615 is greater or equal (according to the compare function) to the given
616 @a item.
617
618 You have to do extra work to know if the @a item already exists in
619 array.
620
621 This function is useful in conjunction with AddAt() for a common
622 operation of "insert only if not found".
623 */
624 size_t IndexForInsert(T item) const;
625
626 /**
627 The notation @c "CMPFUNCT<T>" should be read as if we had the following
628 declaration:
629
630 @code
631 template int CMPFUNC(T *first, T *second);
632 @endcode
633
634 Where @e T is the type of the array elements. I.e. it is a function
635 returning @e int which is passed two arguments of type @e T*.
636
637 Sorts the array using the specified compare function: this function
638 should return a negative, zero or positive value according to whether
639 the first element passed to it is less than, equal to or greater than
640 the second one.
641
642 wxSortedArray doesn't have this function because it is always sorted.
643 */
644 void Sort(CMPFUNC<T> compareFunction);
645
646 //@}
647};
648
649
650/**
651 This macro may be used to append all elements of the @a wxArray_arrayToBeAppended
652 array to the @a wxArray_arrayToModify. The two arrays must be of the same type.
653*/
654#define WX_APPEND_ARRAY(wxArray_arrayToModify, wxArray_arrayToBeAppended)
655
656/**
657 This macro may be used to delete all elements of the array before emptying
658 it. It can not be used with wxObjArrays - but they will delete their
659 elements anyway when you call Empty().
660*/
661#define WX_CLEAR_ARRAY(wxArray_arrayToBeCleared)
662
663//@{
664/**
665 This macro declares a new object array class named @a name and containing
666 the elements of type @e T.
667
668 An exported array is used when compiling wxWidgets as a DLL under Windows
669 and the array needs to be visible outside the DLL. An user exported array
670 needed for exporting an array from a user DLL.
671
672 Example:
673
674 @code
675 class MyClass;
676 WX_DECLARE_OBJARRAY(MyClass, wxArrayOfMyClass); // note: not "MyClass *"!
677 @endcode
678
679 You must use WX_DEFINE_OBJARRAY() macro to define the array class,
680 otherwise you would get link errors.
681*/
682#define WX_DECLARE_OBJARRAY(T, name)
683#define WX_DECLARE_EXPORTED_OBJARRAY(T, name)
684#define WX_DECLARE_USER_EXPORTED_OBJARRAY(T, name)
685//@}
686
687//@{
688/**
689 This macro defines a new array class named @a name and containing the
690 elements of type @a T.
691
692 An exported array is used when compiling wxWidgets as a DLL under Windows
693 and the array needs to be visible outside the DLL. An user exported array
694 needed for exporting an array from a user DLL.
695
696 Example:
697
698 @code
699 WX_DEFINE_ARRAY_INT(int, MyArrayInt);
700
701 class MyClass;
702 WX_DEFINE_ARRAY(MyClass *, ArrayOfMyClass);
703 @endcode
704
705 Note that wxWidgets predefines the following standard array classes:
706 @b wxArrayInt, @b wxArrayLong, @b wxArrayShort, @b wxArrayDouble,
707 @b wxArrayPtrVoid.
708*/
709#define WX_DEFINE_ARRAY(T, name)
710#define WX_DEFINE_EXPORTED_ARRAY(T, name)
711#define WX_DEFINE_USER_EXPORTED_ARRAY(T, name, exportspec)
712//@}
713
714//@{
715/**
716 This macro defines the methods of the array class @a name not defined by
717 the WX_DECLARE_OBJARRAY() macro. You must include the file
718 @<wx/arrimpl.cpp@> before using this macro and you must have the full
719 declaration of the class of array elements in scope! If you forget to do
720 the first, the error will be caught by the compiler, but, unfortunately,
721 many compilers will not give any warnings if you forget to do the second -
722 but the objects of the class will not be copied correctly and their real
723 destructor will not be called.
724
725 An exported array is used when compiling wxWidgets as a DLL under Windows
726 and the array needs to be visible outside the DLL. An user exported array
727 needed for exporting an array from a user DLL.
728
729 Example of usage:
730
731 @code
732 // first declare the class!
733 class MyClass
734 {
735 public:
736 MyClass(const MyClass&);
737
738 // ...
739
740 virtual ~MyClass();
741 };
742
743 #include <wx/arrimpl.cpp>
744 WX_DEFINE_OBJARRAY(wxArrayOfMyClass);
745 @endcode
746*/
747#define WX_DEFINE_OBJARRAY(name)
748#define WX_DEFINE_EXPORTED_OBJARRAY(name)
749#define WX_DEFINE_USER_EXPORTED_OBJARRAY(name)
750//@}
751
752//@{
753/**
754 This macro defines a new sorted array class named @a name and containing
755 the elements of type @e T.
756
757 An exported array is used when compiling wxWidgets as a DLL under Windows
758 and the array needs to be visible outside the DLL. An user exported array
759 needed for exporting an array from a user DLL.
760
761 Example:
762
763 @code
764 WX_DEFINE_SORTED_ARRAY_INT(int, MySortedArrayInt);
765
766 class MyClass;
767 WX_DEFINE_SORTED_ARRAY(MyClass *, ArrayOfMyClass);
768 @endcode
769
770 You will have to initialize the objects of this class by passing a
771 comparison function to the array object constructor like this:
772
773 @code
774 int CompareInts(int n1, int n2)
775 {
776 return n1 - n2;
777 }
778
779 MySortedArrayInt sorted(CompareInts);
780
781 int CompareMyClassObjects(MyClass *item1, MyClass *item2)
782 {
783 // sort the items by their address...
784 return Stricmp(item1->GetAddress(), item2->GetAddress());
785 }
786
787 ArrayOfMyClass another(CompareMyClassObjects);
788 @endcode
789*/
790#define WX_DEFINE_SORTED_ARRAY(T, name)
791#define WX_DEFINE_SORTED_EXPORTED_ARRAY(T, name)
792#define WX_DEFINE_SORTED_USER_EXPORTED_ARRAY(T, name)
793//@}
794
795/**
796 This macro may be used to prepend all elements of the @a wxArray_arrayToBePrepended
797 array to the @a wxArray_arrayToModify. The two arrays must be of the same type.
798*/
799#define WX_PREPEND_ARRAY(wxArray_arrayToModify, wxArray_arrayToBePrepended)
800
801//@{
802/**
803 Predefined specialization of wxArray<T> for standard types.
804*/
805typedef wxArray<int> wxArrayInt;
806typedef wxArray<long> wxArrayLong;
807typedef wxArray<short> wxArrayShort;
808typedef wxArray<double> wxArrayDouble;
809typedef wxArray<void*> wxArrayPtrVoid;
810//@}