62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
|
QuadraticProbing.h - Header file for quadratic probing hash table
|
||
|
|
|
||
|
|
#ifndef QUADRATIC_PROBING_H_
|
||
|
|
#define QUADRATIC_PROBING_H_
|
||
|
|
|
||
|
|
#include "vector.h"
|
||
|
|
#include "mystring.h"
|
||
|
|
|
||
|
|
// QuadraticProbing Hash table class
|
||
|
|
//
|
||
|
|
// CONSTRUCTION: an initialization for ITEM_NOT_FOUND
|
||
|
|
// and an approximate initial size or default of 101
|
||
|
|
//
|
||
|
|
// ******************PUBLIC OPERATIONS*********************
|
||
|
|
// void insert( x ) --> Insert x
|
||
|
|
// void remove( x ) --> Remove x
|
||
|
|
// Hashable find( x ) --> Return item that matches x
|
||
|
|
// void makeEmpty( ) --> Remove all items
|
||
|
|
|
||
|
|
template <class HashedObj>
|
||
|
|
class HashTable
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
explicit HashTable( const HashedObj & notFound, int size = 101 );
|
||
|
|
HashTable( const HashTable & rhs )
|
||
|
|
: ITEM_NOT_FOUND( rhs.ITEM_NOT_FOUND ),
|
||
|
|
array( rhs.array ), currentSize( rhs.currentSize ) { }
|
||
|
|
|
||
|
|
const HashedObj & find( const HashedObj & x ) const;
|
||
|
|
|
||
|
|
void makeEmpty( );
|
||
|
|
void insert( const HashedObj & x );
|
||
|
|
void remove( const HashedObj & x );
|
||
|
|
|
||
|
|
const HashTable & operator=( const HashTable & rhs );
|
||
|
|
|
||
|
|
enum EntryType { ACTIVE, EMPTY, DELETED };
|
||
|
|
private:
|
||
|
|
struct HashEntry
|
||
|
|
{
|
||
|
|
HashedObj element;
|
||
|
|
EntryType info;
|
||
|
|
|
||
|
|
HashEntry( const HashedObj & e = HashedObj( ), EntryType i = EMPTY )
|
||
|
|
: element( e ), info( i ) { }
|
||
|
|
};
|
||
|
|
|
||
|
|
vector<HashEntry> array;
|
||
|
|
int currentSize;
|
||
|
|
const HashedObj ITEM_NOT_FOUND;
|
||
|
|
|
||
|
|
bool isActive( int currentPos ) const;
|
||
|
|
int findPos( const HashedObj & x ) const;
|
||
|
|
void rehash( );
|
||
|
|
};
|
||
|
|
|
||
|
|
int hash( const string & key, int tableSize );
|
||
|
|
int hash( int key, int tableSize );
|
||
|
|
|
||
|
|
#include "QuadraticProbing.cpp"
|
||
|
|
#endif
|