95197553f1
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15509 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
550 lines
18 KiB
C++
550 lines
18 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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#ifndef _WX_HASHMAP_H_
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#define _WX_HASHMAP_H_
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#ifdef __GNUG__
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#pragma interface "hashmap.h"
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#endif
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#include "wx/string.h"
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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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_wxHashTable_NodeBase* m_nxt;
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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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// 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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// 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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// 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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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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static void** AllocTable( size_t size )
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{
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return (void **)calloc(size, sizeof(void*));
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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 size = 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( size ) ), \
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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() { DeleteNodes( m_tableBuckets, (_wxHashTable_NodeBase**)m_table, DeleteNode ); } \
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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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// 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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// 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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// 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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// hashing and comparison functors
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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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// 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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wxIntegerHash& operator=(const wxIntegerHash&) { return *this; }
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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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wxIntegerEqual& operator=(const wxIntegerEqual&) { return *this; }
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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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// 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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wxPointerHash& operator=(const wxPointerHash&) { return *this; }
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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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wxPointerEqual& operator=(const wxPointerEqual&) { return *this; }
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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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wxStringHash& operator=(const wxStringHash&) { return *this; }
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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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wxStringEqual& operator=(const wxStringEqual&) { return *this; }
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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
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#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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#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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#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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// and these do exactly the same thing but should be used inside the
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// 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_
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