git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18685 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
		
			
				
	
	
		
			559 lines
		
	
	
		
			19 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			559 lines
		
	
	
		
			19 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| /////////////////////////////////////////////////////////////////////////////
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| // Name:        hashmap.h
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| // Purpose:     wxHashMap class
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| // Author:      Mattia Barbon
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| // Modified by:
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| // Created:     29/01/2002
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| // RCS-ID:      $Id$
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| // Copyright:   (c) Mattia Barbon
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| // Licence:     wxWindows licence
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| /////////////////////////////////////////////////////////////////////////////
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| 
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| #ifndef _WX_HASHMAP_H_
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| #define _WX_HASHMAP_H_
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| 
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| #if defined(__GNUG__) && !defined(__APPLE__)
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| #pragma interface "hashmap.h"
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| #endif
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| 
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| #include "wx/string.h"
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| 
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| // private
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| struct WXDLLEXPORT _wxHashTable_NodeBase
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| {
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|     _wxHashTable_NodeBase() : m_nxt(0) {}
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| 
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|     _wxHashTable_NodeBase* m_nxt;
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| 
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| // Cannot do this:
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| //  DECLARE_NO_COPY_CLASS(_wxHashTable_NodeBase)
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| // without rewriting the macros, which require a public copy constructor.
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| };
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| 
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| // private
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| class WXDLLEXPORT _wxHashTableBase2
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| {
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| public:
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|     typedef void (*NodeDtor)(_wxHashTable_NodeBase*);
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|     typedef unsigned long (*BucketFromNode)(_wxHashTableBase2*,_wxHashTable_NodeBase*);
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|     typedef _wxHashTable_NodeBase* (*ProcessNode)(_wxHashTable_NodeBase*);
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| protected:
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|     static _wxHashTable_NodeBase* DummyProcessNode(_wxHashTable_NodeBase* node);
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|     static void DeleteNodes( size_t buckets, _wxHashTable_NodeBase** table,
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|                              NodeDtor dtor );
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|     static _wxHashTable_NodeBase* GetFirstNode( size_t buckets,
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|                                                 _wxHashTable_NodeBase** table )
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|     {
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|         for( size_t i = 0; i < buckets; ++i )
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|             if( table[i] )
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|                 return table[i];
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|         return 0;
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|     }
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| 
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|     // as static const unsigned prime_count = 31 but works with all compilers
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|     enum { prime_count = 31 };
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|     static const unsigned long ms_primes[prime_count];
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| 
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|     // returns the first prime in ms_primes greater than n
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|     static unsigned long GetNextPrime( unsigned long n );
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| 
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|     // returns the first prime in ms_primes smaller than n
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|     // ( or ms_primes[0] if n is very small )
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|     static unsigned long GetPreviousPrime( unsigned long n );
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| 
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|     static void CopyHashTable( _wxHashTable_NodeBase** srcTable,
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|                                size_t srcBuckets, _wxHashTableBase2* dst,
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|                                _wxHashTable_NodeBase** dstTable,
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|                                BucketFromNode func, ProcessNode proc );
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| 
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|     static void** AllocTable( size_t sz )
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|     {
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|         return (void **)calloc(sz, sizeof(void*));
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|     }
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| };
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| 
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| #define _WX_DECLARE_HASHTABLE( VALUE_T, KEY_T, HASH_T, KEY_EX_T, KEY_EQ_T, CLASSNAME, CLASSEXP, SHOULD_GROW, SHOULD_SHRINK ) \
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| CLASSEXP CLASSNAME : protected _wxHashTableBase2 \
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| { \
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| public: \
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|     typedef KEY_T key_type; \
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|     typedef VALUE_T value_type; \
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|     typedef HASH_T hasher; \
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|     typedef KEY_EQ_T key_equal; \
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|  \
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|     typedef size_t size_type; \
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|     typedef ptrdiff_t difference_type; \
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|     typedef value_type* pointer; \
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|     typedef const value_type* const_pointer; \
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|     typedef value_type& reference; \
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|     typedef const value_type& const_reference; \
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|     /* should these be protected? */ \
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|     typedef const KEY_T const_key_type; \
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|     typedef const VALUE_T const_mapped_type; \
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| public: \
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|     struct Node; \
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|     typedef KEY_EX_T key_extractor; \
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|     typedef CLASSNAME Self; \
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| protected: \
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|     Node** m_table; \
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|     size_t m_tableBuckets; \
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|     size_t m_items; \
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|     hasher m_hasher; \
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|     key_equal m_equals; \
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|     key_extractor m_getKey; \
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| public: \
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|     struct Node:public _wxHashTable_NodeBase \
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|     { \
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|     public: \
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|         Node( const value_type& value ) \
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|             : m_value( value ) {} \
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|         Node* m_next() { return (Node*)this->m_nxt; } \
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|  \
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|         value_type m_value; \
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|     }; \
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|  \
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|     struct Iterator; \
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|     friend struct Iterator; \
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| protected: \
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|     static void DeleteNode( _wxHashTable_NodeBase* node ) \
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|     { \
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|         delete (Node*)node; \
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|     } \
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| public: \
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|     /*                  */ \
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|     /* forward iterator */ \
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|     /*                  */ \
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|     struct Iterator \
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|     { \
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|         Node* m_node; \
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|         Self* m_ht; \
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|  \
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|         Iterator() : m_node(0), m_ht(0) {} \
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|         Iterator( Node* node, const Self* ht ) \
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|             : m_node(node), m_ht((Self*)ht) {} \
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|         bool operator ==( const Iterator& it ) const \
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|             { return m_node == it.m_node; } \
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|         bool operator !=( const Iterator& it ) const \
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|             { return m_node != it.m_node; } \
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|     protected: \
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|         Node* GetNextNode() \
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|         { \
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|             size_type bucket = GetBucketForNode(m_ht,m_node); \
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|             for( size_type i = bucket + 1; i < m_ht->m_tableBuckets; ++i ) \
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|             { \
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|                 if( m_ht->m_table[i] ) \
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|                     return m_ht->m_table[i]; \
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|             } \
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|             return 0; \
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|         } \
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|  \
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|         void PlusPlus() \
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|         { \
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|             Node* next = m_node->m_next(); \
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|             m_node = next ? next : GetNextNode(); \
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|         } \
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|     }; \
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|  \
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| public: \
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|     struct iterator:public Iterator \
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|     { \
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|         iterator() : Iterator() {} \
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|         iterator( Node* node, Self* ht ) : Iterator( node, ht ) {} \
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|         iterator& operator++() { PlusPlus(); return *this; } \
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|         iterator operator++(int) { iterator it=*this;PlusPlus();return it; } \
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|         reference operator *() const { return m_node->m_value; } \
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|         pointer operator ->() const { return &(m_node->m_value); } \
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|     }; \
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|  \
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|     struct const_iterator:public Iterator \
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|     { \
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|         const_iterator() : Iterator() {} \
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|         const_iterator( Node* node, const Self* ht ) \
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|             : Iterator( node, (Self*)ht ) {} \
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|         const_iterator& operator++() { PlusPlus();return *this; } \
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|         const_iterator operator++(int) { const_iterator it=*this;PlusPlus();return it; } \
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|         const_reference operator *() const { return m_node->m_value; } \
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|         const_pointer operator ->() const { return &(m_node->m_value); } \
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|     }; \
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|  \
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|     CLASSNAME( size_type sz = 10, const hasher& hfun = hasher(), \
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|                const key_equal& k_eq = key_equal(), \
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|                const key_extractor& k_ex = key_extractor() ) \
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|         : m_tableBuckets( GetNextPrime( sz ) ), \
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|           m_items( 0 ), \
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|           m_hasher( hfun ), \
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|           m_equals( k_eq ), \
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|           m_getKey( k_ex ) \
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|     { \
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|         m_table = (Node**)AllocTable( m_tableBuckets ); \
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|     } \
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|  \
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|     CLASSNAME( const Self& ht ) \
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|         : m_table( 0 ), \
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|           m_tableBuckets( 0 ), \
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|           m_items( ht.m_items ), \
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|           m_hasher( ht.m_hasher ), \
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|           m_equals( ht.m_equals ), \
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|           m_getKey( ht.m_getKey ) \
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|     { \
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|         HashCopy( ht ); \
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|     } \
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|  \
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|     const Self& operator=( const Self& ht ) \
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|     { \
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|          clear(); \
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|          m_hasher = ht.m_hasher; \
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|          m_equals = ht.m_equals; \
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|          m_getKey = ht.m_getKey; \
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|          m_items = ht.m_items; \
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|          HashCopy( ht ); \
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|          return *this; \
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|     } \
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|  \
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|     ~CLASSNAME() \
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|     { \
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|         clear(); \
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|  \
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|         free(m_table); \
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|     } \
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|  \
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|     hasher hash_funct() { return m_hasher; } \
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|     key_equal key_eq() { return m_equals; } \
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|  \
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|     /* removes all elements from the hash table, but does not */ \
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|     /* shrink it ( perhaps it should ) */ \
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|     void clear() \
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|     { \
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|         DeleteNodes( m_tableBuckets, (_wxHashTable_NodeBase**)m_table, \
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|                      DeleteNode ); \
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|         m_items = 0; \
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|     } \
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|  \
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|     size_type size() const { return m_items; } \
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|     size_type max_size() const { return size_type(-1); } \
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|     bool empty() const { return size() == 0; } \
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|  \
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|     const_iterator end() const { return const_iterator( 0, this ); } \
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|     iterator end() { return iterator( 0, this ); } \
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|     const_iterator begin() const \
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|         { return const_iterator( (Node*)GetFirstNode( m_tableBuckets, (_wxHashTable_NodeBase**)m_table ), this ); }; \
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|     iterator begin() \
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|         { return iterator( (Node*)GetFirstNode( m_tableBuckets, (_wxHashTable_NodeBase**)m_table ), this ); }; \
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|  \
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|     size_type erase( const const_key_type& key ) \
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|     { \
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|         Node** node = GetNodePtr( key ); \
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|  \
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|         if( !node ) \
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|             return 0; \
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|  \
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|         --m_items; \
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|         Node* temp = (*node)->m_next(); \
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|         delete *node; \
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|         (*node) = temp; \
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|         if( SHOULD_SHRINK( m_tableBuckets, m_items ) ) \
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|             ResizeTable( GetPreviousPrime( m_tableBuckets ) - 1 ); \
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|         return 1; \
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|     } \
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|  \
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| protected: \
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|     static size_type GetBucketForNode( Self* ht, Node* node ) \
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|     { \
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|         return ht->m_hasher( ht->m_getKey( node->m_value ) ) \
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|             % ht->m_tableBuckets; \
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|     } \
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|     static Node* CopyNode( Node* node ) { return new Node( *node ); } \
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|  \
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|     Node* GetOrCreateNode( const value_type& value ) \
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|     { \
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|         const const_key_type& key = m_getKey( value ); \
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|         size_t bucket = m_hasher( key ) % m_tableBuckets; \
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|         Node* node = m_table[bucket]; \
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|  \
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|         while( node ) \
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|         { \
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|             if( m_equals( m_getKey( node->m_value ), key ) ) \
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|                 return node; \
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|             node = node->m_next(); \
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|         } \
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|  \
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|         node = new Node( value ); \
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|         node->m_nxt = m_table[bucket]; \
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|         m_table[bucket] = node; \
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|  \
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|         /* must be after the node is inserted */ \
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|         ++m_items; \
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|         if( SHOULD_GROW( m_tableBuckets, m_items ) ) \
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|             ResizeTable( m_tableBuckets ); \
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|  \
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|         return node; \
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|     } \
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|  \
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|     /* returns NULL if not found */ \
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|     Node** GetNodePtr( const const_key_type& key ) const \
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|     { \
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|         unsigned long hash = m_hasher( key ); \
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|         Node** node = &m_table[hash % m_tableBuckets]; \
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|  \
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|         while( *node ) \
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|         { \
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|             if( m_equals( m_getKey( (*node)->m_value ), key ) ) \
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|                 return node; \
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|             node = (Node**)&(*node)->m_nxt; \
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|         } \
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|  \
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|         return 0; \
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|     } \
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|  \
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|     /* returns NULL if not found */ \
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|     /* expressing it in terms of GetNodePtr is 5-8% slower :-( */ \
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|     Node* GetNode( const const_key_type& key ) const \
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|     { \
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|         unsigned long hash = m_hasher( key ); \
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|         Node* node = m_table[hash % m_tableBuckets]; \
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|  \
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|         while( node ) \
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|         { \
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|             if( m_equals( m_getKey( node->m_value ), key ) ) \
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|                 return node; \
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|             node = node->m_next(); \
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|         } \
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|  \
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|         return 0; \
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|     } \
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|  \
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|     void ResizeTable( size_t newSize ) \
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|     { \
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|         newSize = GetNextPrime( newSize ); \
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|         Node** srcTable = m_table; \
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|         size_t srcBuckets = m_tableBuckets; \
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|         m_table = (Node**)AllocTable( newSize ); \
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|         m_tableBuckets = newSize; \
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|  \
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|         CopyHashTable( (_wxHashTable_NodeBase**)srcTable, srcBuckets, \
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|                        this, (_wxHashTable_NodeBase**)m_table, \
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|                        (BucketFromNode)GetBucketForNode,\
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|                        (ProcessNode)&DummyProcessNode ); \
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|         free(srcTable); \
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|     } \
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|  \
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|     /* this must be called _after_ m_table has been cleaned */ \
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|     void HashCopy( const Self& ht ) \
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|     { \
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|         ResizeTable( ht.size() ); \
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|         CopyHashTable( (_wxHashTable_NodeBase**)ht.m_table, ht.m_tableBuckets,\
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|                        (_wxHashTableBase2*)this, \
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|                        (_wxHashTable_NodeBase**)m_table, \
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|                        (BucketFromNode)GetBucketForNode, \
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|                        (ProcessNode)CopyNode ); \
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|     } \
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| };
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| 
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| // defines an STL-like pair class CLASSNAME storing two fields: first of type
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| // KEY_T and second of type VALUE_T
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| #define _WX_DECLARE_PAIR( KEY_T, VALUE_T, CLASSNAME, CLASSEXP ) \
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| CLASSEXP CLASSNAME \
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| { \
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| public: \
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|     typedef KEY_T t1; \
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|     typedef VALUE_T t2; \
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|     typedef const KEY_T const_t1; \
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|     typedef const VALUE_T const_t2; \
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|  \
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|     CLASSNAME( const const_t1& f, const const_t2& s ):first(t1(f)),second(t2(s)) {} \
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|     CLASSNAME( const const_t1& f ):first(t1(f)),second(t2()) {} \
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|  \
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|     t1 first; \
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|     t2 second; \
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| };
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| 
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| // defines the class CLASSNAME returning the key part (of type KEY_T) from a
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| // pair of type PAIR_T
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| #define _WX_DECLARE_HASH_MAP_KEY_EX( KEY_T, PAIR_T, CLASSNAME, CLASSEXP ) \
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| CLASSEXP CLASSNAME \
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| { \
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|     typedef KEY_T key_type; \
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|     typedef PAIR_T pair_type; \
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|     typedef const key_type const_key_type; \
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|     typedef const pair_type const_pair_type; \
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|     typedef const_key_type& const_key_reference; \
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|     typedef const_pair_type& const_pair_reference; \
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| public: \
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|     CLASSNAME() { } \
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|     const_key_reference operator()( const_pair_reference pair ) const { return pair.first; }\
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|     \
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|     /* the dummy assignment operator is needed to suppress compiler */ \
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|     /* warnings from hash table class' operator=(): gcc complains about */ \
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|     /* "statement with no effect" without it */ \
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|     CLASSNAME& operator=(const CLASSNAME&) { return *this; } \
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| };
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| 
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| // grow/shrink predicates
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| inline bool never_grow( size_t, size_t ) { return FALSE; }
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| inline bool never_shrink( size_t, size_t ) { return FALSE; }
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| inline bool grow_lf70( size_t buckets, size_t items )
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| {
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|     return float(items)/float(buckets) >= 0.85;
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| }
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| 
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| // ----------------------------------------------------------------------------
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| // hashing and comparison functors
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| // ----------------------------------------------------------------------------
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| 
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| // NB: implementation detail: all of these classes must have dummy assignment
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| //     operators to suppress warnings about "statement with no effect" from gcc
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| //     in the hash table class assignment operator (where they're assigned)
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| 
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| // integer types
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| class WXDLLEXPORT wxIntegerHash
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| {
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| public:
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|     wxIntegerHash() { }
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|     unsigned long operator()( long x ) const { return (unsigned long)x; }
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|     unsigned long operator()( unsigned long x ) const { return x; }
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|     unsigned long operator()( int x ) const { return (unsigned long)x; }
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|     unsigned long operator()( unsigned int x ) const { return x; }
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|     unsigned long operator()( short x ) const { return (unsigned long)x; }
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|     unsigned long operator()( unsigned short x ) const { return x; }
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| 
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|     wxIntegerHash& operator=(const wxIntegerHash&) { return *this; }
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| };
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| 
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| class WXDLLEXPORT wxIntegerEqual
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| {
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| public:
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|     wxIntegerEqual() { }
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|     bool operator()( long a, long b ) const { return a == b; }
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|     bool operator()( unsigned long a, unsigned long b ) const { return a == b; }
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|     bool operator()( int a, int b ) const { return a == b; }
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|     bool operator()( unsigned int a, unsigned int b ) const { return a == b; }
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|     bool operator()( short a, short b ) const { return a == b; }
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|     bool operator()( unsigned short a, unsigned short b ) const { return a == b; }
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| 
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|     wxIntegerEqual& operator=(const wxIntegerEqual&) { return *this; }
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| };
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| 
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| // pointers
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| class WXDLLEXPORT wxPointerHash
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| {
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| public:
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|     wxPointerHash() { }
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| 
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|     // TODO: this might not work well on architectures with 64 bit pointers but
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|     //       32 bit longs, we should use % ULONG_MAX there
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|     unsigned long operator()( const void* k ) const { return (unsigned long)k; }
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| 
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|     wxPointerHash& operator=(const wxPointerHash&) { return *this; }
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| };
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| 
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| class WXDLLEXPORT wxPointerEqual
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| {
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| public:
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|     wxPointerEqual() { }
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|     bool operator()( const void* a, const void* b ) const { return a == b; }
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| 
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|     wxPointerEqual& operator=(const wxPointerEqual&) { return *this; }
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| };
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| 
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| // wxString, char*, wxChar*
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| class WXDLLEXPORT wxStringHash
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| {
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| public:
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|     wxStringHash() {}
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|     unsigned long operator()( const wxString& x ) const
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|         { return wxCharStringHash( x.c_str() ); }
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|     unsigned long operator()( const wxChar* x ) const
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|         { return wxCharStringHash( x ); }
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|     static unsigned long wxCharStringHash( const wxChar* );
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| #if wxUSE_UNICODE
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|     unsigned long operator()( const char* x ) const
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|         { return charStringHash( x ); }
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|     static unsigned long charStringHash( const char* );
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| #endif // wxUSE_UNICODE
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| 
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|     wxStringHash& operator=(const wxStringHash&) { return *this; }
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| };
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| 
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| class WXDLLEXPORT wxStringEqual
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| {
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| public:
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|     wxStringEqual() {}
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|     bool operator()( const wxString& a, const wxString& b ) const
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|         { return a == b; }
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|     bool operator()( const wxChar* a, const wxChar* b ) const
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|         { return wxStrcmp( a, b ) == 0; }
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| #if wxUSE_UNICODE
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|     bool operator()( const char* a, const char* b ) const
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|         { return strcmp( a, b ) == 0; }
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| #endif // wxUSE_UNICODE
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| 
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|     wxStringEqual& operator=(const wxStringEqual&) { return *this; }
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| };
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| 
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| #define _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP ) \
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| _WX_DECLARE_PAIR( KEY_T, VALUE_T, CLASSNAME##_wxImplementation_Pair, CLASSEXP ) \
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| _WX_DECLARE_HASH_MAP_KEY_EX( KEY_T, CLASSNAME##_wxImplementation_Pair, CLASSNAME##_wxImplementation_KeyEx, CLASSEXP ) \
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| _WX_DECLARE_HASHTABLE( CLASSNAME##_wxImplementation_Pair, KEY_T, HASH_T, CLASSNAME##_wxImplementation_KeyEx, KEY_EQ_T, CLASSNAME##_wxImplementation_HashTable, CLASSEXP, grow_lf70, never_shrink ) \
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| CLASSEXP CLASSNAME:public CLASSNAME##_wxImplementation_HashTable \
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| { \
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| public: \
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|     typedef VALUE_T mapped_type; \
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|  \
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|     CLASSNAME( size_type hint = 100, hasher hf = hasher(), key_equal eq = key_equal() ) \
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|         : CLASSNAME##_wxImplementation_HashTable( hint, hf, eq, CLASSNAME##_wxImplementation_KeyEx() ) {} \
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|  \
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|     mapped_type& operator[]( const const_key_type& key ) \
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|     { \
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|         return GetOrCreateNode( CLASSNAME##_wxImplementation_Pair( key ) )->m_value.second; \
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|     } \
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|  \
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|     const_iterator find( const const_key_type& key ) const \
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|     { \
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|         return const_iterator( GetNode( key ), this ); \
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|     } \
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|  \
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|     iterator find( const const_key_type& key ) \
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|     { \
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|         return iterator( GetNode( key ), this ); \
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|     } \
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|  \
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|     void insert( const value_type& v ) { (*this)[v.first] = v.second; } \
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|  \
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|     size_type erase( const key_type& k ) \
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|         { return CLASSNAME##_wxImplementation_HashTable::erase( k ); } \
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|     void erase( const iterator& it ) { erase( it->first ); } \
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|     void erase( const const_iterator& it ) { erase( it->first ); } \
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|  \
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|     /* count() == 0 | 1 */ \
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|     size_type count( const const_key_type& key ) \
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|         { return GetNode( key ) ? 1 : 0; } \
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| }
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| 
 | |
| // these macros are to be used in the user code
 | |
| #define WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME) \
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|     _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, class )
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| 
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| #define WX_DECLARE_STRING_HASH_MAP( VALUE_T, CLASSNAME ) \
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|     _WX_DECLARE_HASH_MAP( wxString, VALUE_T, wxStringHash, wxStringEqual, \
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|                           CLASSNAME, class )
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| 
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| #define WX_DECLARE_VOIDPTR_HASH_MAP( VALUE_T, CLASSNAME ) \
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|     _WX_DECLARE_HASH_MAP( void*, VALUE_T, wxPointerHash, wxPointerEqual, \
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|                           CLASSNAME, class )
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| 
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| // and these do exactly the same thing but should be used inside the
 | |
| // library
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| #define WX_DECLARE_EXPORTED_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME) \
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|     _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, class WXDLLEXPORT )
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| 
 | |
| #define WX_DECLARE_EXPORTED_STRING_HASH_MAP( VALUE_T, CLASSNAME ) \
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|     _WX_DECLARE_HASH_MAP( wxString, VALUE_T, wxStringHash, wxStringEqual, \
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|                           CLASSNAME, class WXDLLEXPORT )
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| 
 | |
| #define WX_DECLARE_EXPORTED_VOIDPTR_HASH_MAP( VALUE_T, CLASSNAME ) \
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|     _WX_DECLARE_HASH_MAP( void*, VALUE_T, wxPointerHash, wxPointerEqual, \
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|                           CLASSNAME, class WXDLLEXPORT )
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| 
 | |
| #endif // _WX_HASHMAP_H_
 | |
| 
 |