Initial commit

2019-11-15 12:59:38 +01:00
parent 40a414d210
commit b880c3ccde
6814 changed files with 379441 additions and 0 deletions
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+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