include/wx/hashset.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/hashset.h
   3 // Purpose:     wxHashSet class
   4 // Author:      Mattia Barbon
   5 // Modified by:
   6 // Created:     11/08/2003
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Mattia Barbon
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_HASHSET_H_
  13 #define _WX_HASHSET_H_
  14
  15 #include "wx/hashmap.h"
  16
  17 #if wxUSE_STL && defined(HAVE_STL_HASH_MAP)
  18
  19 #if defined(HAVE_EXT_HASH_MAP)
  20     #include <ext/hash_set>
  21 #elif defined(HAVE_HASH_MAP)
  22     #include <hash_set>
  23 #endif
  24
  25 #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
  26     typedef WX_HASH_MAP_NAMESPACE::hash_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME;
  27
  28 #else // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)
  29
  30 // this is a complex way of defining an easily inlineable identity function...
  31 #define _WX_DECLARE_HASH_SET_KEY_EX( KEY_T, CLASSNAME, CLASSEXP )            \
  32 CLASSEXP CLASSNAME                                                           \
  33 {                                                                            \
  34     typedef KEY_T key_type;                                                  \
  35     typedef const key_type const_key_type;                                   \
  36     typedef const_key_type& const_key_reference;                             \
  37 public:                                                                      \
  38     CLASSNAME() { }                                                          \
  39     const_key_reference operator()( const_key_reference key ) const          \
  40         { return key; }                                                      \
  41                                                                              \
  42     /* the dummy assignment operator is needed to suppress compiler */       \
  43     /* warnings from hash table class' operator=(): gcc complains about */   \
  44     /* "statement with no effect" without it */                              \
  45     CLASSNAME& operator=(const CLASSNAME&) { return *this; }                 \
  46 };
  47
  48 #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
  49 _WX_DECLARE_HASH_SET_KEY_EX( KEY_T, CLASSNAME##_wxImplementation_KeyEx, CLASSEXP ) \
  50 _WX_DECLARE_HASHTABLE( KEY_T, KEY_T, HASH_T, CLASSNAME##_wxImplementation_KeyEx, KEY_EQ_T, CLASSNAME##_wxImplementation_HashTable, CLASSEXP, grow_lf70, never_shrink ) \
  51 CLASSEXP CLASSNAME:public CLASSNAME##_wxImplementation_HashTable             \
  52 {                                                                            \
  53 public:                                                                      \
  54     wxEXPLICIT CLASSNAME( size_type hint = 100, hasher hf = hasher(),        \
  55                           key_equal eq = key_equal() )                       \
  56         : CLASSNAME##_wxImplementation_HashTable( hint, hf, eq,              \
  57                       CLASSNAME##_wxImplementation_KeyEx() ) {}              \
  58                                                                              \
  59     void insert( const key_type& key )                                       \
  60     {                                                                        \
  61         GetOrCreateNode( key );                                              \
  62     }                                                                        \
  63                                                                              \
  64     const_iterator find( const const_key_type& key ) const                   \
  65     {                                                                        \
  66         return const_iterator( GetNode( key ), this );                       \
  67     }                                                                        \
  68                                                                              \
  69     iterator find( const const_key_type& key )                               \
  70     {                                                                        \
  71         return iterator( GetNode( key ), this );                             \
  72     }                                                                        \
  73                                                                              \
  74     size_type erase( const key_type& k )                                     \
  75         { return CLASSNAME##_wxImplementation_HashTable::erase( k ); }       \
  76     void erase( const iterator& it ) { erase( *it ); }                       \
  77     void erase( const const_iterator& it ) { erase( *it ); }                 \
  78                                                                              \
  79     /* count() == 0 | 1 */                                                   \
  80     size_type count( const const_key_type& key )                             \
  81         { return GetNode( key ) ? 1 : 0; }                                   \
  82 }
  83
  84 #endif // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)
  85
  86 // these macros are to be used in the user code
  87 #define WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
  88     _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, class )
  89
  90 // and these do exactly the same thing but should be used inside the
  91 // library
  92 #define WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL) \
  93     _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL )
  94
  95 #define WX_DECLARE_EXPORTED_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
  96     WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, \
  97                                    CLASSNAME, class WXDLLEXPORT )
  98
  99 // delete all hash elements
 100 //
 101 // NB: the class declaration of the hash elements must be visible from the
 102 //     place where you use this macro, otherwise the proper destructor may not
 103 //     be called (a decent compiler should give a warning about it, but don't
 104 //     count on it)!
 105 #define WX_CLEAR_HASH_SET(type, hashset)                                     \
 106     WX_CLEAR_HASH_MAP(type, hashset)
 107
 108 #endif // _WX_HASHSET_H_