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notes32 - Data Structures Gustavo Rodriguez-Rivera...

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Data Structures Gustavo Rodriguez-Rivera Spring '08 | Week5 HashTables Implementation of a HashTable in C++: HashTableVoid.h: // Each hash entry stores a key, object pair struct HashTableVoidEntry { const char * _key; void * _data; HashTableVoidEntry * _next; }; // This is a Hash table that maps string keys to objects of type Data class HashTableVoid { public: // Number of buckets enum { TableSize = 2039}; // Array of the hash buckets. HashTableVoidEntry **_buckets; // Obtain the hash code of a key int hash(const char * key); public: HashTableVoid(); // Add a record to the hash table. Returns true if key already exists. // Substitute content if key already exists. bool insertItem( const char * key, void * data); // Find a key in the dictionary and place in "data" the corresponding record // Returns false if key is does not exist bool find( const char * key, void ** data); // Removes an element in the hash table. Return false if key does not exist. bool removeElement(const char * key); }; class HashTableVoidIterator { int _currentBucket; HashTableVoidEntry *_currentEntry; HashTableVoid * _hashTable;
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