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