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 // see comment in wx/hashmap.h which also applies to different standard hash
  18 // set classes
  19
  20 #if wxUSE_STL && \
  21     (defined(HAVE_STD_UNORDERED_SET) || defined(HAVE_TR1_UNORDERED_SET))
  22
  23 #if defined(HAVE_STD_UNORDERED_SET)
  24     #include <unordered_set>
  25     #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
  26         typedef std::unordered_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME
  27 #elif defined(HAVE_TR1_UNORDERED_SET)
  28     #include <tr1/unordered_set>
  29     #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
  30         typedef std::tr1::unordered_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME
  31 #else
  32 #error Update this code: unordered_set is available, but I do not know where.
  33 #endif
  34
  35 #elif wxUSE_STL && defined(HAVE_STL_HASH_MAP)
  36
  37 #if defined(HAVE_EXT_HASH_MAP)
  38     #include <ext/hash_set>
  39 #elif defined(HAVE_HASH_MAP)
  40     #include <hash_set>
  41 #endif
  42
  43 #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
  44     typedef WX_HASH_MAP_NAMESPACE::hash_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME
  45
  46 #else // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)
  47
  48 // this is a complex way of defining an easily inlineable identity function...
  49 #define _WX_DECLARE_HASH_SET_KEY_EX( KEY_T, CLASSNAME, CLASSEXP )            \
  50 CLASSEXP CLASSNAME                                                           \
  51 {                                                                            \
  52     typedef KEY_T key_type;                                                  \
  53     typedef const key_type const_key_type;                                   \
  54     typedef const_key_type& const_key_reference;                             \
  55 public:                                                                      \
  56     CLASSNAME() { }                                                          \
  57     const_key_reference operator()( const_key_reference key ) const          \
  58         { return key; }                                                      \
  59                                                                              \
  60     /* the dummy assignment operator is needed to suppress compiler */       \
  61     /* warnings from hash table class' operator=(): gcc complains about */   \
  62     /* "statement with no effect" without it */                              \
  63     CLASSNAME& operator=(const CLASSNAME&) { return *this; }                 \
  64 };
  65
  66 #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
  67 _WX_DECLARE_HASH_SET_KEY_EX( KEY_T, CLASSNAME##_wxImplementation_KeyEx, CLASSEXP ) \
  68 _WX_DECLARE_HASHTABLE( KEY_T, KEY_T, HASH_T, CLASSNAME##_wxImplementation_KeyEx, KEY_EQ_T, CLASSNAME##_wxImplementation_HashTable, CLASSEXP, grow_lf70, never_shrink ) \
  69 CLASSEXP CLASSNAME:public CLASSNAME##_wxImplementation_HashTable             \
  70 {                                                                            \
  71 public:                                                                      \
  72     _WX_DECLARE_PAIR( iterator, bool, Insert_Result, CLASSEXP )              \
  73                                                                              \
  74     wxEXPLICIT CLASSNAME( size_type hint = 100, hasher hf = hasher(),        \
  75                           key_equal eq = key_equal() )                       \
  76         : CLASSNAME##_wxImplementation_HashTable( hint, hf, eq,              \
  77                       CLASSNAME##_wxImplementation_KeyEx() ) {}              \
  78                                                                              \
  79     Insert_Result insert( const key_type& key )                              \
  80     {                                                                        \
  81         bool created;                                                        \
  82         Node *node = GetOrCreateNode( key, created );                        \
  83         return Insert_Result( iterator( node, this ), created );             \
  84     }                                                                        \
  85                                                                              \
  86     const_iterator find( const const_key_type& key ) const                   \
  87     {                                                                        \
  88         return const_iterator( GetNode( key ), this );                       \
  89     }                                                                        \
  90                                                                              \
  91     iterator find( const const_key_type& key )                               \
  92     {                                                                        \
  93         return iterator( GetNode( key ), this );                             \
  94     }                                                                        \
  95                                                                              \
  96     size_type erase( const key_type& k )                                     \
  97         { return CLASSNAME##_wxImplementation_HashTable::erase( k ); }       \
  98     void erase( const iterator& it ) { erase( *it ); }                       \
  99     void erase( const const_iterator& it ) { erase( *it ); }                 \
 100                                                                              \
 101     /* count() == 0 | 1 */                                                   \
 102     size_type count( const const_key_type& key )                             \
 103         { return GetNode( key ) ? 1 : 0; }                                   \
 104 }
 105
 106 #endif // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)
 107
 108 // these macros are to be used in the user code
 109 #define WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
 110     _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, class )
 111
 112 // and these do exactly the same thing but should be used inside the
 113 // library
 114 #define WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL) \
 115     _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL )
 116
 117 #define WX_DECLARE_EXPORTED_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
 118     WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, \
 119                                    CLASSNAME, class WXDLLIMPEXP_CORE )
 120
 121 // delete all hash elements
 122 //
 123 // NB: the class declaration of the hash elements must be visible from the
 124 //     place where you use this macro, otherwise the proper destructor may not
 125 //     be called (a decent compiler should give a warning about it, but don't
 126 //     count on it)!
 127 #define WX_CLEAR_HASH_SET(type, hashset)                                     \
 128     {                                                                        \
 129         type::iterator it, en;                                               \
 130         for( it = (hashset).begin(), en = (hashset).end(); it != en; ++it )  \
 131             delete *it;                                                      \
 132         (hashset).clear();                                                   \
 133     }
 134
 135 #endif // _WX_HASHSET_H_