include/wx/dynarray.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dynarray.h
   3 // Purpose:     auto-resizable (i.e. dynamic) array support
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     12.09.97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _DYNARRAY_H
  13 #define   _DYNARRAY_H
  14
  15 #ifdef __GNUG__
  16 #pragma interface "dynarray.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20 #include "wx/debug.h"
  21
  22 /** @name Dynamic arrays and lists
  23     @memo Arrays which grow on demand and do range checking (only in debug)
  24   */
  25 //@{
  26
  27 // ----------------------------------------------------------------------------
  28 // constants
  29 // ----------------------------------------------------------------------------
  30
  31 /**
  32  the initial size by which an array/list grows when an element is added
  33  default value avoids allocate one or two bytes when the array is created
  34  which is rather inefficient
  35 */
  36 #define   WX_ARRAY_DEFAULT_INITIAL_SIZE    (16)
  37
  38 // ----------------------------------------------------------------------------
  39 // types
  40 // ----------------------------------------------------------------------------
  41
  42 /**
  43  callback compare function for quick sort
  44  must return negative value, 0 or positive value if pItem1 <, = or > pItem2
  45  */
  46
  47 #ifdef  __VISUALC__
  48   #define   CMPFUNC_CONV    _cdecl
  49 #else   // !Visual C++
  50   #define   CMPFUNC_CONV
  51 #endif  // compiler
  52 typedef int (CMPFUNC_CONV *CMPFUNC)(const void* pItem1, const void* pItem2);
  53
  54 // ----------------------------------------------------------------------------
  55 /**
  56  base class managing data having size of type 'long' (not used directly)
  57
  58  NB: for efficiency this often used class has no virtual functions (hence no
  59      VTBL), even dtor is <B>not</B> virtual. If used as expected it won't
  60      create any problems because ARRAYs from DEFINE_ARRAY have no dtor at all,
  61      so it's not too important if it's not called (this happens when you cast
  62      "SomeArray *" as "BaseArray *" and then delete it)
  63
  64   @memo Base class for template array and list classes
  65 */
  66 // ----------------------------------------------------------------------------
  67 class WXDLLEXPORT wxBaseArray
  68 {
  69 public:
  70   /** @name ctors and dtor */
  71   //@{
  72     /// default ctor
  73   wxBaseArray();
  74     /// copy ctor
  75   wxBaseArray(const wxBaseArray& array);
  76     /// assignment operator
  77   wxBaseArray& operator=(const wxBaseArray& src);
  78     /// not virtual, see above
  79     /// EXCEPT for Gnu compiler to reduce warnings...
  80 #ifdef __GNUG__
  81  virtual
  82 #endif
  83   ~wxBaseArray();
  84   //@}
  85
  86   /** @name memory management */
  87   //@{
  88     /// empties the list, but doesn't release memory
  89   void Empty() { m_nCount = 0; }
  90     /// empties the list and releases memory
  91   void Clear();
  92     /// preallocates memory for given number of items
  93   void Alloc(size_t uiSize);
  94     /// minimizes the memory used by the array (frees unused memory)
  95   void Shrink();
  96   //@}
  97
  98   /** @name simple accessors */
  99   //@{
 100     /// number of elements in the array
 101   size_t  Count() const   { return m_nCount;      }
 102   size_t  GetCount() const   { return m_nCount;      }
 103     /// is it empty?
 104   bool  IsEmpty() const { return m_nCount == 0; }
 105   //@}
 106
 107 protected:
 108   // these methods are protected because if they were public one could
 109   // mistakenly call one of them instead of DEFINE_ARRAY's or LIST's
 110   // type safe methods
 111
 112   /** @name items access */
 113   //@{
 114     /// get item at position uiIndex (range checking is done in debug version)
 115   long& Item(size_t uiIndex) const
 116     { wxASSERT( uiIndex < m_nCount ); return m_pItems[uiIndex]; }
 117     /// same as Item()
 118   long& operator[](size_t uiIndex) const { return Item(uiIndex); }
 119   //@}
 120
 121   /** @name item management */
 122   //@{
 123     /**
 124       Search the element in the array, starting from the either side
 125       @param bFromEnd if TRUE, start from the end
 126       @return index of the first item matched or NOT_FOUND
 127       @see NOT_FOUND
 128      */
 129   int Index(long lItem, bool bFromEnd = FALSE) const;
 130     /// search for an item using binary search in a sorted array
 131   int Index(long lItem, CMPFUNC fnCompare) const;
 132     /// add new element at the end
 133   void Add(long lItem);
 134     /// add item assuming the array is sorted with fnCompare function
 135   void Add(long lItem, CMPFUNC fnCompare);
 136     /// add new element at given position (it becomes Item[uiIndex])
 137   void Insert(long lItem, size_t uiIndex);
 138     /// remove first item matching this value
 139   void Remove(long lItem);
 140     /// remove item by index
 141   void Remove(size_t uiIndex);
 142   //@}
 143
 144   /// sort array elements using given compare function
 145   void Sort(CMPFUNC fnCompare);
 146
 147 private:
 148   void    Grow();     // makes array bigger if needed
 149
 150   size_t  m_nSize,    // current size of the array
 151           m_nCount;   // current number of elements
 152
 153   long   *m_pItems;   // pointer to data
 154 };
 155
 156 // ============================================================================
 157 // template classes
 158 // ============================================================================
 159
 160 // ----------------------------------------------------------------------------
 161 // This macro generates a new array class. It is intended for storage of simple
 162 // types of sizeof()<=sizeof(long) or pointers if sizeof(pointer)<=sizeof(long)
 163 //
 164 // NB: it has only inline functions => takes no space at all
 165 // ----------------------------------------------------------------------------
 166 #define  _WX_DEFINE_ARRAY(T, name)                                  \
 167 typedef int (CMPFUNC_CONV *CMPFUNC##T)(T *pItem1, T *pItem2);       \
 168 class WXDLLEXPORTLOCAL name : public wxBaseArray                                     \
 169 {                                                                   \
 170 public:                                                             \
 171   name()                                                            \
 172     { wxASSERT( sizeof(T) <= sizeof(long) ); }                      \
 173                                                                     \
 174   name& operator=(const name& src)                                  \
 175     { ((wxBaseArray *)this)->operator=((const wxBaseArray&)src);    \
 176       return *this; }                                               \
 177                                                                     \
 178   T& operator[](size_t uiIndex) const                               \
 179     { return (T&)(wxBaseArray::Item(uiIndex)); }                    \
 180   T& Item(size_t uiIndex) const                                     \
 181     { return (T&)(wxBaseArray::Item(uiIndex)); }                    \
 182   T& Last() const                                                   \
 183     { return (T&)(wxBaseArray::Item(Count() - 1)); }                \
 184                                                                     \
 185   int Index(T Item, bool bFromEnd = FALSE) const                    \
 186     { return wxBaseArray::Index((long)Item, bFromEnd); }            \
 187                                                                     \
 188   void Add(T Item)                                                  \
 189     { wxBaseArray::Add((long)Item); }                               \
 190   void Insert(T Item, size_t uiIndex)                               \
 191     { wxBaseArray::Insert((long)Item, uiIndex) ; }                  \
 192                                                                     \
 193   void Remove(size_t uiIndex) { wxBaseArray::Remove(uiIndex); }     \
 194   void Remove(T Item)                                               \
 195     { int iIndex = Index(Item);                                     \
 196       wxCHECK2_MSG( iIndex != NOT_FOUND, return,                    \
 197         "removing inexisting element in wxArray::Remove" );         \
 198       wxBaseArray::Remove((size_t)iIndex); }                          \
 199                                                                     \
 200   void Sort(CMPFUNC##T fCmp) { wxBaseArray::Sort((CMPFUNC)fCmp); }  \
 201 }
 202
 203 // ----------------------------------------------------------------------------
 204 // This is the same as the previous macro, but it defines a sorted array.
 205 // Differences:
 206 //  1) it must be given a COMPARE function in ctor which takes 2 items of type
 207 //     T* and should return -1, 0 or +1 if the first one is less/greater
 208 //     than/equal to the second one.
 209 //  2) the Add() method inserts the item in such was that the array is always
 210 //     sorted (it uses the COMPARE function)
 211 //  3) it has no Sort() method because it's always sorted
 212 //  4) Index() method is much faster (the sorted arrays use binary search
 213 //     instead of linear one), but Add() is slower.
 214 //
 215 // Summary: use this class when the speed of Index() function is important, use
 216 // the normal arrays otherwise.
 217 //
 218 // NB: it has only inline functions => takes no space at all
 219 // ----------------------------------------------------------------------------
 220 #define  _WX_DEFINE_SORTED_ARRAY(T, name)                           \
 221 typedef int (CMPFUNC_CONV *SCMPFUNC##T)(T pItem1, T pItem2);        \
 222 class WXDLLEXPORTLOCAL  name : public wxBaseArray                                     \
 223 {                                                                   \
 224 public:                                                             \
 225   name(SCMPFUNC##T fn)                                              \
 226     { wxASSERT( sizeof(T) <= sizeof(long) ); m_fnCompare = fn; }    \
 227                                                                     \
 228   name& operator=(const name& src)                                  \
 229     { ((wxBaseArray *)this)->operator=((const wxBaseArray&)src);    \
 230       m_fnCompare = src.m_fnCompare;                                \
 231       return *this; }                                               \
 232                                                                     \
 233   T& operator[](size_t uiIndex) const                               \
 234     { return (T&)(wxBaseArray::Item(uiIndex)); }                    \
 235   T& Item(size_t uiIndex) const                                     \
 236     { return (T&)(wxBaseArray::Item(uiIndex)); }                    \
 237   T& Last() const                                                   \
 238     { return (T&)(wxBaseArray::Item(Count() - 1)); }                \
 239                                                                     \
 240   int Index(T Item) const                                           \
 241     { return wxBaseArray::Index((long)Item, (CMPFUNC)m_fnCompare); }\
 242                                                                     \
 243   void Add(T Item)                                                  \
 244     { wxBaseArray::Add((long)Item, (CMPFUNC)m_fnCompare); }         \
 245                                                                     \
 246   void Remove(size_t uiIndex) { wxBaseArray::Remove(uiIndex); }     \
 247   void Remove(T Item)                                               \
 248     { int iIndex = Index(Item);                                     \
 249       wxCHECK2_MSG( iIndex != NOT_FOUND, return,                    \
 250         "removing inexisting element in wxArray::Remove" );         \
 251       wxBaseArray::Remove((size_t)iIndex); }                        \
 252                                                                     \
 253 private:                                                            \
 254   SCMPFUNC##T m_fnCompare;                                          \
 255 }
 256
 257 // ----------------------------------------------------------------------------
 258 // see WX_DECLARE_LIST and WX_DEFINE_LIST
 259 // ----------------------------------------------------------------------------
 260 #define _WX_DECLARE_LIST(T, name)                                   \
 261 typedef int (CMPFUNC_CONV *CMPFUNC##T)(T** pItem1, T** pItem2);     \
 262 class WXDLLEXPORTLOCAL  name : public wxBaseArray                                     \
 263 {                                                                   \
 264 public:                                                             \
 265   name() { }                                                        \
 266   name(const name& src);                                            \
 267   name& operator=(const name& src);                                 \
 268                                                                     \
 269   ~name();                                                          \
 270                                                                     \
 271   T& operator[](size_t uiIndex) const                               \
 272     { return *(T*)wxBaseArray::Item(uiIndex); }                     \
 273   T& Item(size_t uiIndex) const                                     \
 274     { return *(T*)wxBaseArray::Item(uiIndex); }                     \
 275   T& Last() const                                                   \
 276     { return *(T*)(wxBaseArray::Item(Count() - 1)); }               \
 277                                                                     \
 278   int Index(const T& Item, bool bFromEnd = FALSE) const;            \
 279                                                                     \
 280   void Add(const T& Item);                                          \
 281   void Add(const T* pItem)                                          \
 282     { wxBaseArray::Add((long)pItem); }                              \
 283                                                                     \
 284   void Insert(const T& Item,  size_t uiIndex);                      \
 285   void Insert(const T* pItem, size_t uiIndex)                       \
 286     { wxBaseArray::Insert((long)pItem, uiIndex); }                  \
 287                                                                     \
 288   void Empty();                                                     \
 289                                                                     \
 290   T*   Detach(size_t uiIndex)                                       \
 291     { T* p = (T*)wxBaseArray::Item(uiIndex);                        \
 292       wxBaseArray::Remove(uiIndex); return p; }                     \
 293   void Remove(size_t uiIndex);                                      \
 294                                                                     \
 295   void Sort(CMPFUNC##T fCmp) { wxBaseArray::Sort((CMPFUNC)fCmp); }  \
 296                                                                     \
 297 private:                                                            \
 298   void DoCopy(const name& src);                                     \
 299 }
 300
 301 // ----------------------------------------------------------------------------
 302 /** @name Macros for definition of dynamic arrays and lists
 303
 304   These macros are ugly (especially if you look in the sources ;-), but they
 305   allow us to define 'template' classes without actually using templates.
 306   <BR>
 307   <BR>
 308   Range checking is performed in debug build for both arrays and lists. Type
 309   checking is done at compile-time. Warning: arrays <I>never</I> shrink, they
 310   only grow, so loading 10 millions in an array only to delete them 2 lines
 311   below is <I>not</I> recommended. However, it does free memory when it's
 312   destroyed, so if you destroy array also, it's ok.
 313   */
 314 // ----------------------------------------------------------------------------
 315
 316 //@{
 317   /**
 318    This macro generates a new array class. It is intended for storage of simple
 319    types of sizeof()<=sizeof(long) or pointers if sizeof(pointer)<=sizeof(long)
 320    <BR>
 321    NB: it has only inline functions => takes no space at all
 322    <BR>
 323
 324    @memo declare and define array class 'name' containing elements of type 'T'
 325   */
 326 #define WX_DEFINE_ARRAY(T, name)  typedef T _A##name;                        \
 327                                   _WX_DEFINE_ARRAY(_A##name, name)
 328
 329   /**
 330    This macro does the same as WX_DEFINE_ARRAY except that the array will be
 331    sorted with the specified compare function.
 332    */
 333 #define WX_DEFINE_SORTED_ARRAY(T, name)  typedef T _A##name;                 \
 334                                   _WX_DEFINE_SORTED_ARRAY(_A##name, name)
 335
 336   /**
 337    This macro generates a new list class which owns the objects it contains,
 338    i.e. it will delete them when it is destroyed. An element is of type T*,
 339    but arguments of type T& are taken (see below!) and T& is returned.
 340    <BR>
 341    Don't use this for simple types such as "int" or "long"!
 342    You _may_ use it for "double" but it's awfully inefficient.
 343    <BR>
 344    <BR>
 345    Note on Add/Insert functions:
 346    <BR>
 347     1) function(T*) gives the object to the list, i.e. it will delete the
 348        object when it's removed or in the list's dtor
 349    <BR>
 350     2) function(T&) will create a copy of the object and work with it
 351    <BR>
 352    <BR>
 353    Also:
 354    <BR>
 355     1) Remove() will delete the object after removing it from the list
 356    <BR>
 357     2) Detach() just removes the object from the list (returning pointer to it)
 358    <BR>
 359    <BR>
 360    NB1: Base type T should have an accessible copy ctor  if  Add(T&) is used,
 361    <BR>
 362    NB2: Never ever cast a list to it's base type: as dtor is <B>not</B> virtual
 363         it will provoke memory leaks
 364    <BR>
 365    <BR>
 366    some functions of this class are not inline, so it takes some space to
 367    define new class from this template.
 368
 369    @memo declare list class 'name' containing elements of type 'T'
 370   */
 371 #define WX_DECLARE_OBJARRAY(T, name)  typedef T _L##name;                 \
 372                                       _WX_DECLARE_LIST(_L##name, name)
 373   /**
 374     To use a list class you must
 375     <ll>
 376     <li>#include "dynarray.h"
 377     <li>DECLARE_LIST(element_type, list_class_name)
 378     <li>#include "listimpl.cpp"
 379     <li>DEFINE_LIST(list_class_name)   // same as above!
 380     </ll>
 381     <BR><BR>
 382     This is necessary because at the moment of DEFINE_LIST class element_type
 383     must be fully defined (i.e. forward declaration is not enough), while
 384     DECLARE_LIST may be done anywhere. The separation of two allows to break
 385     cicrcular dependencies with classes which have member variables of list
 386     type.
 387
 388     @memo define (must include listimpl.cpp!) list class 'name'
 389    */
 390 #define WX_DEFINE_OBJARRAY(name)       "don't forget to include listimpl.cpp!"
 391 //@}
 392
 393 // ----------------------------------------------------------------------------
 394 /** @name Some commonly used predefined arrays */
 395 // # overhead if not used?
 396 // ----------------------------------------------------------------------------
 397
 398 #define WXDLLEXPORTLOCAL WXDLLEXPORT
 399
 400 //@{
 401   /** @name ArrayInt */
 402 WX_DEFINE_ARRAY(int,    wxArrayInt);
 403   /** @name ArrayLong */
 404 WX_DEFINE_ARRAY(long,   wxArrayLong);
 405   /** @name ArrayPtrVoid */
 406 WX_DEFINE_ARRAY(void *, wxArrayPtrVoid);
 407 //@}
 408
 409 //@}
 410
 411 #undef  WXDLLEXPORTLOCAL
 412 #define WXDLLEXPORTLOCAL
 413
 414 #endif // _DYNARRAY_H
 415