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+/*:*
+ *: File: ./src/hmap.h
+ *:
+ *: yChat; Homepage: www.yChat.org; Version 0.5.6-BASIC
+ *:
+ *: Copyright (C) 2003, 2004 Paul C. Buetow, Volker Richter
+ *: Copyright (C) 2005 EXA Digital Solutions GbR
+ *:
+ *: This program is free software; you can redistribute it and/or
+ *: modify it under the terms of the GNU General Public License
+ *: as published by the Free Software Foundation; either version 2
+ *: of the License, or (at your option) any later version.
+ *:
+ *: This program is distributed in the hope that it will be useful,
+ *: but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *: GNU General Public License for more details.
+ *:
+ *: You should have received a copy of the GNU General Public License
+ *: along with this program; if not, write to the Free Software
+ *: Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *:*/
+
+#pragma warning(disable:4786)
+
+#ifndef hmap_h
+#define hmap_h
+
+#include <vector>
+#include "incl.h"
+
+using namespace std;
+
+// void add_elem( obj_type x, key_type k ) --> Insert x
+// void del_elem( key_type k ) --> Remove x
+// obj_type get_elem( key_type k ) --> Return item that matches x
+// void make_empty( ) --> Remove all items
+
+template <class obj_type, class key_type>
+class hmap
+{
+private:
+ enum entry_type
+ {
+ ACTIVE, EMPTY, DELETED
+ };
+
+ struct hash_entry
+ {
+ obj_type element;
+ key_type key;
+ entry_type info;
+
+ hash_entry( const obj_type &e = obj_type( ), const key_type &k = key_type( ), entry_type i = EMPTY ) : element( e ), key( k ), info( i )
+ { }
+ }
+ ;
+
+ int occupied;
+
+ virtual bool isActive( int currentPos ) const;
+ virtual void rehash( );
+ virtual bool isPrime ( int n ) const;
+ virtual int nextPrime( int n ) const;
+ double maxOccupiedPercentage;
+
+protected:
+ int lookups;
+ unsigned int hash( const string &key ) const;
+ vector<hash_entry> array;
+
+public:
+ hmap( double moc );
+
+ virtual int findPos ( const key_type &k );
+ virtual void make_empty( );
+ virtual void add_elem ( const obj_type &x, const key_type &k );
+ virtual void del_elem ( const key_type &k );
+ virtual obj_type get_elem ( const key_type &k );
+
+ virtual void run_func( void (*func)(obj_type) );
+ virtual void run_func( void (*func)(obj_type, void*), void* v_arg );
+
+ // inline:
+ void getSize()
+ {
+ int size = 0;
+ for( int j = 0; j < array.size( ); j++ )
+ if (array[ j ].info == ACTIVE)
+ size++;
+ return size;
+ };
+
+ int getLookups()
+ {
+ return lookups;
+ };
+
+ int getCapacity()
+ {
+ return array.size();
+ };
+
+ double getLambda()
+ {
+ return static_cast<double>(getSize())/static_cast<double>(getCapacity());
+ }
+
+ obj_type& operator[]( key_type &k )
+ {
+ return get_elem( k );
+ }
+
+};
+
+template <class obj_type, class key_type>
+class linearhmap : public hmap<obj_type, key_type>
+{
+public:
+ linearhmap(double moc) : hmap<obj_type, key_type>(moc)
+ {}
+ ;
+
+ virtual int findPos( const key_type &k )
+ {
+ int collisionNum = 0;
+ int currentPos = hash( k ) % hmap<obj_type, key_type>::array.size( );
+ hmap<obj_type, key_type>::lookups++;
+
+ while( hmap<obj_type, key_type>::array[ currentPos ].info != hmap<obj_type, key_type>::EMPTY &&
+ hmap<obj_type, key_type>::array[ currentPos ].key != k )
+ {
+ hmap<obj_type, key_type>::lookups ++;
+ currentPos++;
+
+ if( currentPos >= hmap<obj_type, key_type>::array.size( ) )
+ currentPos -= hmap<obj_type, key_type>::array.size( );
+ }
+
+ return currentPos;
+ }
+};
+
+#include "hmap.cpp"
+
+#endif