include/wx/hashmap.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/hashmap.h
   3 // Purpose:     wxHashMap class
   4 // Author:      Mattia Barbon
   5 // Modified by:
   6 // Created:     29/01/2002
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Mattia Barbon
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_HASHMAP_H_
  13 #define _WX_HASHMAP_H_
  14
  15 #include "wx/string.h"
  16 #include "wx/wxcrt.h"
  17
  18 // In wxUSE_STL build we prefer to use the standard hash map class but it can
  19 // be either in non-standard hash_map header (old g++ and some other STL
  20 // implementations) or in C++0x standard unordered_map which can in turn be
  21 // available either in std::tr1 or std namespace itself
  22 //
  23 // To summarize: if std::unordered_map is available use it, otherwise use tr1
  24 // and finally fall back to non-standard hash_map
  25
  26 #if (defined(HAVE_EXT_HASH_MAP) || defined(HAVE_HASH_MAP)) \
  27     && (defined(HAVE_GNU_CXX_HASH_MAP) || defined(HAVE_STD_HASH_MAP))
  28     #define HAVE_STL_HASH_MAP
  29 #endif
  30
  31 #if wxUSE_STL && \
  32     (defined(HAVE_STD_UNORDERED_MAP) || defined(HAVE_TR1_UNORDERED_MAP))
  33
  34 #if defined(HAVE_STD_UNORDERED_MAP)
  35     #include <unordered_map>
  36     #define WX_HASH_MAP_NAMESPACE std
  37 #elif defined(HAVE_TR1_UNORDERED_MAP)
  38     #include <tr1/unordered_map>
  39     #define WX_HASH_MAP_NAMESPACE std::tr1
  40 #endif
  41
  42 #define _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP ) \
  43     typedef WX_HASH_MAP_NAMESPACE::unordered_map< KEY_T, VALUE_T, HASH_T, KEY_EQ_T > CLASSNAME
  44
  45 #elif wxUSE_STL && defined(HAVE_STL_HASH_MAP)
  46
  47 #if defined(HAVE_EXT_HASH_MAP)
  48     #include <ext/hash_map>
  49 #elif defined(HAVE_HASH_MAP)
  50     #include <hash_map>
  51 #endif
  52
  53 #if defined(HAVE_GNU_CXX_HASH_MAP)
  54     #define WX_HASH_MAP_NAMESPACE __gnu_cxx
  55 #elif defined(HAVE_STD_HASH_MAP)
  56     #define WX_HASH_MAP_NAMESPACE std
  57 #endif
  58
  59 #define _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP ) \
  60     typedef WX_HASH_MAP_NAMESPACE::hash_map< KEY_T, VALUE_T, HASH_T, KEY_EQ_T > CLASSNAME
  61
  62 #else // !wxUSE_STL || no std::{hash,unordered}_map class available
  63
  64 #define wxNEEDS_WX_HASH_MAP
  65
  66 #ifdef __WXWINCE__
  67 typedef int ptrdiff_t;
  68 #else
  69 #include <stddef.h>             // for ptrdiff_t
  70 #endif
  71
  72 // private
  73 struct WXDLLIMPEXP_BASE _wxHashTable_NodeBase
  74 {
  75     _wxHashTable_NodeBase() : m_next(NULL) {}
  76
  77     _wxHashTable_NodeBase* m_next;
  78
  79 // Cannot do this:
  80 //  DECLARE_NO_COPY_CLASS(_wxHashTable_NodeBase)
  81 // without rewriting the macros, which require a public copy constructor.
  82 };
  83
  84 // private
  85 class WXDLLIMPEXP_BASE _wxHashTableBase2
  86 {
  87 public:
  88     typedef void (*NodeDtor)(_wxHashTable_NodeBase*);
  89     typedef unsigned long (*BucketFromNode)(_wxHashTableBase2*,_wxHashTable_NodeBase*);
  90     typedef _wxHashTable_NodeBase* (*ProcessNode)(_wxHashTable_NodeBase*);
  91 protected:
  92     static _wxHashTable_NodeBase* DummyProcessNode(_wxHashTable_NodeBase* node);
  93     static void DeleteNodes( size_t buckets, _wxHashTable_NodeBase** table,
  94                              NodeDtor dtor );
  95     static _wxHashTable_NodeBase* GetFirstNode( size_t buckets,
  96                                                 _wxHashTable_NodeBase** table )
  97     {
  98         for( size_t i = 0; i < buckets; ++i )
  99             if( table[i] )
 100                 return table[i];
 101         return NULL;
 102     }
 103
 104     // as static const unsigned prime_count = 31 but works with all compilers
 105     enum { prime_count = 31 };
 106     static const unsigned long ms_primes[prime_count];
 107
 108     // returns the first prime in ms_primes greater than n
 109     static unsigned long GetNextPrime( unsigned long n );
 110
 111     // returns the first prime in ms_primes smaller than n
 112     // ( or ms_primes[0] if n is very small )
 113     static unsigned long GetPreviousPrime( unsigned long n );
 114
 115     static void CopyHashTable( _wxHashTable_NodeBase** srcTable,
 116                                size_t srcBuckets, _wxHashTableBase2* dst,
 117                                _wxHashTable_NodeBase** dstTable,
 118                                BucketFromNode func, ProcessNode proc );
 119
 120     static void** AllocTable( size_t sz )
 121     {
 122         return (void **)calloc(sz, sizeof(void*));
 123     }
 124     static void FreeTable(void *table)
 125     {
 126         free(table);
 127     }
 128 };
 129
 130 #define _WX_DECLARE_HASHTABLE( VALUE_T, KEY_T, HASH_T, KEY_EX_T, KEY_EQ_T, CLASSNAME, CLASSEXP, SHOULD_GROW, SHOULD_SHRINK ) \
 131 CLASSEXP CLASSNAME : protected _wxHashTableBase2 \
 132 { \
 133 public: \
 134     typedef KEY_T key_type; \
 135     typedef VALUE_T value_type; \
 136     typedef HASH_T hasher; \
 137     typedef KEY_EQ_T key_equal; \
 138  \
 139     typedef size_t size_type; \
 140     typedef ptrdiff_t difference_type; \
 141     typedef value_type* pointer; \
 142     typedef const value_type* const_pointer; \
 143     typedef value_type& reference; \
 144     typedef const value_type& const_reference; \
 145     /* should these be protected? */ \
 146     typedef const KEY_T const_key_type; \
 147     typedef const VALUE_T const_mapped_type; \
 148 public: \
 149     typedef KEY_EX_T key_extractor; \
 150     typedef CLASSNAME Self; \
 151 protected: \
 152     _wxHashTable_NodeBase** m_table; \
 153     size_t m_tableBuckets; \
 154     size_t m_items; \
 155     hasher m_hasher; \
 156     key_equal m_equals; \
 157     key_extractor m_getKey; \
 158 public: \
 159     struct Node:public _wxHashTable_NodeBase \
 160     { \
 161     public: \
 162         Node( const value_type& value ) \
 163             : m_value( value ) {} \
 164         Node* next() { return static_cast<Node*>(m_next); } \
 165  \
 166         value_type m_value; \
 167     }; \
 168  \
 169 protected: \
 170     static void DeleteNode( _wxHashTable_NodeBase* node ) \
 171     { \
 172         delete static_cast<Node*>(node); \
 173     } \
 174 public: \
 175     /*                  */ \
 176     /* forward iterator */ \
 177     /*                  */ \
 178     CLASSEXP Iterator \
 179     { \
 180     public: \
 181         Node* m_node; \
 182         Self* m_ht; \
 183  \
 184         Iterator() : m_node(NULL), m_ht(NULL) {} \
 185         Iterator( Node* node, const Self* ht ) \
 186             : m_node(node), m_ht(const_cast<Self*>(ht)) {} \
 187         bool operator ==( const Iterator& it ) const \
 188             { return m_node == it.m_node; } \
 189         bool operator !=( const Iterator& it ) const \
 190             { return m_node != it.m_node; } \
 191     protected: \
 192         Node* GetNextNode() \
 193         { \
 194             size_type bucket = GetBucketForNode(m_ht,m_node); \
 195             for( size_type i = bucket + 1; i < m_ht->m_tableBuckets; ++i ) \
 196             { \
 197                 if( m_ht->m_table[i] ) \
 198                     return static_cast<Node*>(m_ht->m_table[i]); \
 199             } \
 200             return NULL; \
 201         } \
 202  \
 203         void PlusPlus() \
 204         { \
 205             Node* next = m_node->next(); \
 206             m_node = next ? next : GetNextNode(); \
 207         } \
 208     }; \
 209     friend class Iterator; \
 210  \
 211 public: \
 212     CLASSEXP iterator : public Iterator \
 213     { \
 214     public: \
 215         iterator() : Iterator() {} \
 216         iterator( Node* node, Self* ht ) : Iterator( node, ht ) {} \
 217         iterator& operator++() { PlusPlus(); return *this; } \
 218         iterator operator++(int) { iterator it=*this;PlusPlus();return it; } \
 219         reference operator *() const { return m_node->m_value; } \
 220         pointer operator ->() const { return &(m_node->m_value); } \
 221     }; \
 222  \
 223     CLASSEXP const_iterator : public Iterator \
 224     { \
 225     public: \
 226         const_iterator() : Iterator() {} \
 227         const_iterator(iterator i) : Iterator(i) {} \
 228         const_iterator( Node* node, const Self* ht ) \
 229             : Iterator(node, const_cast<Self*>(ht)) {} \
 230         const_iterator& operator++() { PlusPlus();return *this; } \
 231         const_iterator operator++(int) { const_iterator it=*this;PlusPlus();return it; } \
 232         const_reference operator *() const { return m_node->m_value; } \
 233         const_pointer operator ->() const { return &(m_node->m_value); } \
 234     }; \
 235  \
 236     CLASSNAME( size_type sz = 10, const hasher& hfun = hasher(), \
 237                const key_equal& k_eq = key_equal(), \
 238                const key_extractor& k_ex = key_extractor() ) \
 239         : m_tableBuckets( GetNextPrime( (unsigned long) sz ) ), \
 240           m_items( 0 ), \
 241           m_hasher( hfun ), \
 242           m_equals( k_eq ), \
 243           m_getKey( k_ex ) \
 244     { \
 245         m_table = (_wxHashTable_NodeBase**)AllocTable(m_tableBuckets); \
 246     } \
 247  \
 248     CLASSNAME( const Self& ht ) \
 249         : m_table(NULL), \
 250           m_tableBuckets( 0 ), \
 251           m_items( ht.m_items ), \
 252           m_hasher( ht.m_hasher ), \
 253           m_equals( ht.m_equals ), \
 254           m_getKey( ht.m_getKey ) \
 255     { \
 256         HashCopy( ht ); \
 257     } \
 258  \
 259     const Self& operator=( const Self& ht ) \
 260     { \
 261          if (&ht != this) \
 262          { \
 263              clear(); \
 264              m_hasher = ht.m_hasher; \
 265              m_equals = ht.m_equals; \
 266              m_getKey = ht.m_getKey; \
 267              m_items = ht.m_items; \
 268              HashCopy( ht ); \
 269          } \
 270          return *this; \
 271     } \
 272  \
 273     ~CLASSNAME() \
 274     { \
 275         clear(); \
 276  \
 277         FreeTable(m_table); \
 278     } \
 279  \
 280     hasher hash_funct() { return m_hasher; } \
 281     key_equal key_eq() { return m_equals; } \
 282  \
 283     /* removes all elements from the hash table, but does not */ \
 284     /* shrink it ( perhaps it should ) */ \
 285     void clear() \
 286     { \
 287         DeleteNodes(m_tableBuckets, m_table, DeleteNode); \
 288         m_items = 0; \
 289     } \
 290  \
 291     size_type size() const { return m_items; } \
 292     size_type max_size() const { return size_type(-1); } \
 293     bool empty() const { return size() == 0; } \
 294  \
 295     const_iterator end() const { return const_iterator(NULL, this); } \
 296     iterator end() { return iterator(NULL, this); } \
 297     const_iterator begin() const \
 298         { return const_iterator(static_cast<Node*>(GetFirstNode(m_tableBuckets, m_table)), this); } \
 299     iterator begin() \
 300         { return iterator(static_cast<Node*>(GetFirstNode(m_tableBuckets, m_table)), this); } \
 301  \
 302     size_type erase( const const_key_type& key ) \
 303     { \
 304         _wxHashTable_NodeBase** node = GetNodePtr(key); \
 305  \
 306         if( !node ) \
 307             return 0; \
 308  \
 309         --m_items; \
 310         _wxHashTable_NodeBase* temp = (*node)->m_next; \
 311         delete static_cast<Node*>(*node); \
 312         (*node) = temp; \
 313         if( SHOULD_SHRINK( m_tableBuckets, m_items ) ) \
 314             ResizeTable( GetPreviousPrime( (unsigned long) m_tableBuckets ) - 1 ); \
 315         return 1; \
 316     } \
 317  \
 318 protected: \
 319     static size_type GetBucketForNode( Self* ht, Node* node ) \
 320     { \
 321         return ht->m_hasher( ht->m_getKey( node->m_value ) ) \
 322             % ht->m_tableBuckets; \
 323     } \
 324     static Node* CopyNode( Node* node ) { return new Node( *node ); } \
 325  \
 326     Node* GetOrCreateNode( const value_type& value, bool& created ) \
 327     { \
 328         const const_key_type& key = m_getKey( value ); \
 329         size_t bucket = m_hasher( key ) % m_tableBuckets; \
 330         Node* node = static_cast<Node*>(m_table[bucket]); \
 331  \
 332         while( node ) \
 333         { \
 334             if( m_equals( m_getKey( node->m_value ), key ) ) \
 335             { \
 336                 created = false; \
 337                 return node; \
 338             } \
 339             node = node->next(); \
 340         } \
 341         created = true; \
 342         return CreateNode( value, bucket); \
 343     }\
 344     Node * CreateNode( const value_type& value, size_t bucket ) \
 345     {\
 346         Node* node = new Node( value ); \
 347         node->m_next = m_table[bucket]; \
 348         m_table[bucket] = node; \
 349  \
 350         /* must be after the node is inserted */ \
 351         ++m_items; \
 352         if( SHOULD_GROW( m_tableBuckets, m_items ) ) \
 353             ResizeTable( m_tableBuckets ); \
 354  \
 355         return node; \
 356     } \
 357     void CreateNode( const value_type& value ) \
 358     {\
 359         CreateNode(value, m_hasher( m_getKey(value) ) % m_tableBuckets ); \
 360     }\
 361  \
 362     /* returns NULL if not found */ \
 363     _wxHashTable_NodeBase** GetNodePtr(const const_key_type& key) const \
 364     { \
 365         size_t bucket = m_hasher( key ) % m_tableBuckets; \
 366         _wxHashTable_NodeBase** node = &m_table[bucket]; \
 367  \
 368         while( *node ) \
 369         { \
 370             if (m_equals(m_getKey(static_cast<Node*>(*node)->m_value), key)) \
 371                 return node; \
 372             node = &(*node)->m_next; \
 373         } \
 374  \
 375         return NULL; \
 376     } \
 377  \
 378     /* returns NULL if not found */ \
 379     /* expressing it in terms of GetNodePtr is 5-8% slower :-( */ \
 380     Node* GetNode( const const_key_type& key ) const \
 381     { \
 382         size_t bucket = m_hasher( key ) % m_tableBuckets; \
 383         Node* node = static_cast<Node*>(m_table[bucket]); \
 384  \
 385         while( node ) \
 386         { \
 387             if( m_equals( m_getKey( node->m_value ), key ) ) \
 388                 return node; \
 389             node = node->next(); \
 390         } \
 391  \
 392         return NULL; \
 393     } \
 394  \
 395     void ResizeTable( size_t newSize ) \
 396     { \
 397         newSize = GetNextPrime( (unsigned long)newSize ); \
 398         _wxHashTable_NodeBase** srcTable = m_table; \
 399         size_t srcBuckets = m_tableBuckets; \
 400         m_table = (_wxHashTable_NodeBase**)AllocTable( newSize ); \
 401         m_tableBuckets = newSize; \
 402  \
 403         CopyHashTable( srcTable, srcBuckets, \
 404                        this, m_table, \
 405                        (BucketFromNode)GetBucketForNode,\
 406                        (ProcessNode)&DummyProcessNode ); \
 407         FreeTable(srcTable); \
 408     } \
 409  \
 410     /* this must be called _after_ m_table has been cleaned */ \
 411     void HashCopy( const Self& ht ) \
 412     { \
 413         ResizeTable( ht.size() ); \
 414         CopyHashTable( ht.m_table, ht.m_tableBuckets, \
 415                        (_wxHashTableBase2*)this, \
 416                        m_table, \
 417                        (BucketFromNode)GetBucketForNode, \
 418                        (ProcessNode)CopyNode ); \
 419     } \
 420 };
 421
 422 // defines an STL-like pair class CLASSNAME storing two fields: first of type
 423 // KEY_T and second of type VALUE_T
 424 #define _WX_DECLARE_PAIR( KEY_T, VALUE_T, CLASSNAME, CLASSEXP ) \
 425 CLASSEXP CLASSNAME \
 426 { \
 427 public: \
 428     typedef KEY_T first_type; \
 429     typedef VALUE_T second_type; \
 430     typedef KEY_T t1; \
 431     typedef VALUE_T t2; \
 432     typedef const KEY_T const_t1; \
 433     typedef const VALUE_T const_t2; \
 434  \
 435     CLASSNAME(const const_t1& f, const const_t2& s) \
 436         : first(const_cast<t1&>(f)), second(const_cast<t2&>(s)) {} \
 437  \
 438     t1 first; \
 439     t2 second; \
 440 };
 441
 442 // defines the class CLASSNAME returning the key part (of type KEY_T) from a
 443 // pair of type PAIR_T
 444 #define _WX_DECLARE_HASH_MAP_KEY_EX( KEY_T, PAIR_T, CLASSNAME, CLASSEXP ) \
 445 CLASSEXP CLASSNAME \
 446 { \
 447     typedef KEY_T key_type; \
 448     typedef PAIR_T pair_type; \
 449     typedef const key_type const_key_type; \
 450     typedef const pair_type const_pair_type; \
 451     typedef const_key_type& const_key_reference; \
 452     typedef const_pair_type& const_pair_reference; \
 453 public: \
 454     CLASSNAME() { } \
 455     const_key_reference operator()( const_pair_reference pair ) const { return pair.first; }\
 456     \
 457     /* the dummy assignment operator is needed to suppress compiler */ \
 458     /* warnings from hash table class' operator=(): gcc complains about */ \
 459     /* "statement with no effect" without it */ \
 460     CLASSNAME& operator=(const CLASSNAME&) { return *this; } \
 461 };
 462
 463 // grow/shrink predicates
 464 inline bool never_grow( size_t, size_t ) { return false; }
 465 inline bool never_shrink( size_t, size_t ) { return false; }
 466 inline bool grow_lf70( size_t buckets, size_t items )
 467 {
 468     return float(items)/float(buckets) >= 0.85;
 469 }
 470
 471 #endif // various hash map implementations
 472
 473 // ----------------------------------------------------------------------------
 474 // hashing and comparison functors
 475 // ----------------------------------------------------------------------------
 476
 477 // NB: implementation detail: all of these classes must have dummy assignment
 478 //     operators to suppress warnings about "statement with no effect" from gcc
 479 //     in the hash table class assignment operator (where they're assigned)
 480
 481 #ifndef wxNEEDS_WX_HASH_MAP
 482
 483 // integer types
 484 class WXDLLIMPEXP_BASE wxIntegerHash
 485 {
 486     WX_HASH_MAP_NAMESPACE::hash<long> longHash;
 487     WX_HASH_MAP_NAMESPACE::hash<unsigned long> ulongHash;
 488     WX_HASH_MAP_NAMESPACE::hash<int> intHash;
 489     WX_HASH_MAP_NAMESPACE::hash<unsigned int> uintHash;
 490     WX_HASH_MAP_NAMESPACE::hash<short> shortHash;
 491     WX_HASH_MAP_NAMESPACE::hash<unsigned short> ushortHash;
 492
 493 #if defined wxLongLong_t && !defined wxLongLongIsLong
 494     // hash<wxLongLong_t> ought to work but doesn't on some compilers
 495     #if (!defined SIZEOF_LONG_LONG && SIZEOF_LONG == 4) \
 496         || (defined SIZEOF_LONG_LONG && SIZEOF_LONG_LONG == SIZEOF_LONG * 2)
 497     size_t longlongHash( wxLongLong_t x ) const
 498     {
 499         return longHash( wx_truncate_cast(long, x) ) ^
 500                longHash( wx_truncate_cast(long, x >> (sizeof(long) * 8)) );
 501     }
 502     #elif defined SIZEOF_LONG_LONG && SIZEOF_LONG_LONG == SIZEOF_LONG
 503     WX_HASH_MAP_NAMESPACE::hash<long> longlongHash;
 504     #else
 505     WX_HASH_MAP_NAMESPACE::hash<wxLongLong_t> longlongHash;
 506     #endif
 507 #endif
 508
 509 public:
 510     wxIntegerHash() { }
 511     size_t operator()( long x ) const { return longHash( x ); }
 512     size_t operator()( unsigned long x ) const { return ulongHash( x ); }
 513     size_t operator()( int x ) const { return intHash( x ); }
 514     size_t operator()( unsigned int x ) const { return uintHash( x ); }
 515     size_t operator()( short x ) const { return shortHash( x ); }
 516     size_t operator()( unsigned short x ) const { return ushortHash( x ); }
 517 #if defined wxLongLong_t && !defined wxLongLongIsLong
 518     size_t operator()( wxLongLong_t x ) const { return longlongHash(x); }
 519     size_t operator()( wxULongLong_t x ) const { return longlongHash(x); }
 520 #endif
 521
 522     wxIntegerHash& operator=(const wxIntegerHash&) { return *this; }
 523 };
 524
 525 #else // wxNEEDS_WX_HASH_MAP
 526
 527 // integer types
 528 class WXDLLIMPEXP_BASE wxIntegerHash
 529 {
 530 public:
 531     wxIntegerHash() { }
 532     unsigned long operator()( long x ) const { return (unsigned long)x; }
 533     unsigned long operator()( unsigned long x ) const { return x; }
 534     unsigned long operator()( int x ) const { return (unsigned long)x; }
 535     unsigned long operator()( unsigned int x ) const { return x; }
 536     unsigned long operator()( short x ) const { return (unsigned long)x; }
 537     unsigned long operator()( unsigned short x ) const { return x; }
 538 #if defined wxLongLong_t && !defined wxLongLongIsLong
 539     wxULongLong_t operator()( wxLongLong_t x ) const { return static_cast<wxULongLong_t>(x); }
 540     wxULongLong_t operator()( wxULongLong_t x ) const { return x; }
 541 #endif
 542
 543     wxIntegerHash& operator=(const wxIntegerHash&) { return *this; }
 544 };
 545
 546 #endif // !wxNEEDS_WX_HASH_MAP/wxNEEDS_WX_HASH_MAP
 547
 548 class WXDLLIMPEXP_BASE wxIntegerEqual
 549 {
 550 public:
 551     wxIntegerEqual() { }
 552     bool operator()( long a, long b ) const { return a == b; }
 553     bool operator()( unsigned long a, unsigned long b ) const { return a == b; }
 554     bool operator()( int a, int b ) const { return a == b; }
 555     bool operator()( unsigned int a, unsigned int b ) const { return a == b; }
 556     bool operator()( short a, short b ) const { return a == b; }
 557     bool operator()( unsigned short a, unsigned short b ) const { return a == b; }
 558 #if defined wxLongLong_t && !defined wxLongLongIsLong
 559     bool operator()( wxLongLong_t a, wxLongLong_t b ) const { return a == b; }
 560     bool operator()( wxULongLong_t a, wxULongLong_t b ) const { return a == b; }
 561 #endif
 562
 563     wxIntegerEqual& operator=(const wxIntegerEqual&) { return *this; }
 564 };
 565
 566 // pointers
 567 class WXDLLIMPEXP_BASE wxPointerHash
 568 {
 569 public:
 570     wxPointerHash() { }
 571
 572 #ifdef wxNEEDS_WX_HASH_MAP
 573     wxUIntPtr operator()( const void* k ) const { return wxPtrToUInt(k); }
 574 #else
 575     size_t operator()( const void* k ) const { return (size_t)k; }
 576 #endif
 577
 578     wxPointerHash& operator=(const wxPointerHash&) { return *this; }
 579 };
 580
 581 class WXDLLIMPEXP_BASE wxPointerEqual
 582 {
 583 public:
 584     wxPointerEqual() { }
 585     bool operator()( const void* a, const void* b ) const { return a == b; }
 586
 587     wxPointerEqual& operator=(const wxPointerEqual&) { return *this; }
 588 };
 589
 590 // wxString, char*, wchar_t*
 591 class WXDLLIMPEXP_BASE wxStringHash
 592 {
 593 public:
 594     wxStringHash() {}
 595     unsigned long operator()( const wxString& x ) const
 596         { return stringHash( x.wx_str() ); }
 597     unsigned long operator()( const wchar_t* x ) const
 598         { return stringHash( x ); }
 599     unsigned long operator()( const char* x ) const
 600         { return stringHash( x ); }
 601
 602 #if WXWIN_COMPATIBILITY_2_8
 603     static unsigned long wxCharStringHash( const wxChar* x )
 604         { return stringHash(x); }
 605     #if wxUSE_UNICODE
 606     static unsigned long charStringHash( const char* x )
 607         { return stringHash(x); }
 608     #endif
 609 #endif // WXWIN_COMPATIBILITY_2_8
 610
 611     static unsigned long stringHash( const wchar_t* );
 612     static unsigned long stringHash( const char* );
 613
 614     wxStringHash& operator=(const wxStringHash&) { return *this; }
 615 };
 616
 617 class WXDLLIMPEXP_BASE wxStringEqual
 618 {
 619 public:
 620     wxStringEqual() {}
 621     bool operator()( const wxString& a, const wxString& b ) const
 622         { return a == b; }
 623     bool operator()( const wxChar* a, const wxChar* b ) const
 624         { return wxStrcmp( a, b ) == 0; }
 625 #if wxUSE_UNICODE
 626     bool operator()( const char* a, const char* b ) const
 627         { return strcmp( a, b ) == 0; }
 628 #endif // wxUSE_UNICODE
 629
 630     wxStringEqual& operator=(const wxStringEqual&) { return *this; }
 631 };
 632
 633 #ifdef wxNEEDS_WX_HASH_MAP
 634
 635 #define _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP ) \
 636 _WX_DECLARE_PAIR( KEY_T, VALUE_T, CLASSNAME##_wxImplementation_Pair, CLASSEXP ) \
 637 _WX_DECLARE_HASH_MAP_KEY_EX( KEY_T, CLASSNAME##_wxImplementation_Pair, CLASSNAME##_wxImplementation_KeyEx, CLASSEXP ) \
 638 _WX_DECLARE_HASHTABLE( CLASSNAME##_wxImplementation_Pair, KEY_T, HASH_T, CLASSNAME##_wxImplementation_KeyEx, KEY_EQ_T, CLASSNAME##_wxImplementation_HashTable, CLASSEXP, grow_lf70, never_shrink ) \
 639 CLASSEXP CLASSNAME:public CLASSNAME##_wxImplementation_HashTable \
 640 { \
 641 public: \
 642     typedef VALUE_T mapped_type; \
 643     _WX_DECLARE_PAIR( iterator, bool, Insert_Result, CLASSEXP ) \
 644  \
 645     wxEXPLICIT CLASSNAME( size_type hint = 100, hasher hf = hasher(),        \
 646                           key_equal eq = key_equal() )                       \
 647         : CLASSNAME##_wxImplementation_HashTable( hint, hf, eq,              \
 648                                    CLASSNAME##_wxImplementation_KeyEx() ) {} \
 649  \
 650     mapped_type& operator[]( const const_key_type& key ) \
 651     { \
 652         bool created; \
 653         return GetOrCreateNode( \
 654                 CLASSNAME##_wxImplementation_Pair( key, mapped_type() ), \
 655                 created)->m_value.second; \
 656     } \
 657  \
 658     const_iterator find( const const_key_type& key ) const \
 659     { \
 660         return const_iterator( GetNode( key ), this ); \
 661     } \
 662  \
 663     iterator find( const const_key_type& key ) \
 664     { \
 665         return iterator( GetNode( key ), this ); \
 666     } \
 667  \
 668     Insert_Result insert( const value_type& v ) \
 669     { \
 670         bool created; \
 671         Node *node = GetOrCreateNode( \
 672                 CLASSNAME##_wxImplementation_Pair( v.first, v.second ), \
 673                 created); \
 674         return Insert_Result(iterator(node, this), created); \
 675     } \
 676  \
 677     size_type erase( const key_type& k ) \
 678         { return CLASSNAME##_wxImplementation_HashTable::erase( k ); } \
 679     void erase( const iterator& it ) { erase( it->first ); } \
 680  \
 681     /* count() == 0 | 1 */ \
 682     size_type count( const const_key_type& key ) \
 683     { \
 684         /* explicit cast needed to suppress CodeWarrior warnings */ \
 685         return (size_type)(GetNode( key ) ? 1 : 0); \
 686     } \
 687 }
 688
 689 #endif // wxNEEDS_WX_HASH_MAP
 690
 691 // these macros are to be used in the user code
 692 #define WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME) \
 693     _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, class )
 694
 695 #define WX_DECLARE_STRING_HASH_MAP( VALUE_T, CLASSNAME ) \
 696     _WX_DECLARE_HASH_MAP( wxString, VALUE_T, wxStringHash, wxStringEqual, \
 697                           CLASSNAME, class )
 698
 699 #define WX_DECLARE_VOIDPTR_HASH_MAP( VALUE_T, CLASSNAME ) \
 700     _WX_DECLARE_HASH_MAP( void*, VALUE_T, wxPointerHash, wxPointerEqual, \
 701                           CLASSNAME, class )
 702
 703 // and these do exactly the same thing but should be used inside the
 704 // library
 705 #define WX_DECLARE_HASH_MAP_WITH_DECL( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL) \
 706     _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL )
 707
 708 #define WX_DECLARE_EXPORTED_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME) \
 709     WX_DECLARE_HASH_MAP_WITH_DECL( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, \
 710                                    CLASSNAME, class WXDLLIMPEXP_CORE )
 711
 712 #define WX_DECLARE_STRING_HASH_MAP_WITH_DECL( VALUE_T, CLASSNAME, DECL ) \
 713     _WX_DECLARE_HASH_MAP( wxString, VALUE_T, wxStringHash, wxStringEqual, \
 714                           CLASSNAME, DECL )
 715
 716 #define WX_DECLARE_EXPORTED_STRING_HASH_MAP( VALUE_T, CLASSNAME ) \
 717     WX_DECLARE_STRING_HASH_MAP_WITH_DECL( VALUE_T, CLASSNAME, \
 718                                           class WXDLLIMPEXP_CORE )
 719
 720 #define WX_DECLARE_VOIDPTR_HASH_MAP_WITH_DECL( VALUE_T, CLASSNAME, DECL ) \
 721     _WX_DECLARE_HASH_MAP( void*, VALUE_T, wxPointerHash, wxPointerEqual, \
 722                           CLASSNAME, DECL )
 723
 724 #define WX_DECLARE_EXPORTED_VOIDPTR_HASH_MAP( VALUE_T, CLASSNAME ) \
 725     WX_DECLARE_VOIDPTR_HASH_MAP_WITH_DECL( VALUE_T, CLASSNAME, \
 726                                            class WXDLLIMPEXP_CORE )
 727
 728 // delete all hash elements
 729 //
 730 // NB: the class declaration of the hash elements must be visible from the
 731 //     place where you use this macro, otherwise the proper destructor may not
 732 //     be called (a decent compiler should give a warning about it, but don't
 733 //     count on it)!
 734 #define WX_CLEAR_HASH_MAP(type, hashmap)                                     \
 735     {                                                                        \
 736         type::iterator it, en;                                               \
 737         for( it = (hashmap).begin(), en = (hashmap).end(); it != en; ++it )  \
 738             delete it->second;                                               \
 739         (hashmap).clear();                                                   \
 740     }
 741
 742 //---------------------------------------------------------------------------
 743 // Declarations of common hashmap classes
 744
 745 WX_DECLARE_HASH_MAP_WITH_DECL( long, long, wxIntegerHash, wxIntegerEqual,
 746                                wxLongToLongHashMap, class WXDLLIMPEXP_BASE );
 747
 748 WX_DECLARE_STRING_HASH_MAP_WITH_DECL( wxString, wxStringToStringHashMap,
 749                                       class WXDLLIMPEXP_BASE );
 750
 751
 752 #endif // _WX_HASHMAP_H_