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