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     _WX_DECLARE_PAIR( iterator, bool, Insert_Result, CLASSEXP )              \
  55                                                                              \
  56     wxEXPLICIT CLASSNAME( size_type hint = 100, hasher hf = hasher(),        \
  57                           key_equal eq = key_equal() )                       \
  58         : CLASSNAME##_wxImplementation_HashTable( hint, hf, eq,              \
  59                       CLASSNAME##_wxImplementation_KeyEx() ) {}              \
  60                                                                              \
  61     Insert_Result insert( const key_type& key )                              \
  62     {                                                                        \
  63         bool created;                                                        \
  64         Node *node = GetOrCreateNode( key, created );                        \
  65         return Insert_Result( iterator( node, this ), created );             \
  66     }                                                                        \
  67                                                                              \
  68     const_iterator find( const const_key_type& key ) const                   \
  69     {                                                                        \
  70         return const_iterator( GetNode( key ), this );                       \
  71     }                                                                        \
  72                                                                              \
  73     iterator find( const const_key_type& key )                               \
  74     {                                                                        \
  75         return iterator( GetNode( key ), this );                             \
  76     }                                                                        \
  77                                                                              \
  78     size_type erase( const key_type& k )                                     \
  79         { return CLASSNAME##_wxImplementation_HashTable::erase( k ); }       \
  80     void erase( const iterator& it ) { erase( *it ); }                       \
  81     void erase( const const_iterator& it ) { erase( *it ); }                 \
  82                                                                              \
  83     /* count() == 0 | 1 */                                                   \
  84     size_type count( const const_key_type& key )                             \
  85         { return GetNode( key ) ? 1 : 0; }                                   \
  86 }
  87
  88 #endif // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)
  89
  90 // these macros are to be used in the user code
  91 #define WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
  92     _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, class )
  93
  94 // and these do exactly the same thing but should be used inside the
  95 // library
  96 #define WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL) \
  97     _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL )
  98
  99 #define WX_DECLARE_EXPORTED_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
 100     WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, \
 101                                    CLASSNAME, class WXDLLEXPORT )
 102
 103 // delete all hash elements
 104 //
 105 // NB: the class declaration of the hash elements must be visible from the
 106 //     place where you use this macro, otherwise the proper destructor may not
 107 //     be called (a decent compiler should give a warning about it, but don't
 108 //     count on it)!
 109 #define WX_CLEAR_HASH_SET(type, hashset)                                     \
 110     {                                                                        \
 111         type::iterator it, en;                                               \
 112         for( it = (hashset).begin(), en = (hashset).end(); it != en; ++it )  \
 113             delete *it;                                                      \
 114         (hashset).clear();                                                   \
 115     }
 116
 117 #endif // _WX_HASHSET_H_