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Writing a valid copy constructor for a hash map in C++


HashMap::HashMap(const HashMap& hm)
{
    amountOfBuckets=hm.amountOfBuckets; 
    hashTable= new Node* [amountOfBuckets];

    for (int i=0; i<amountOfBuckets; i++)
    {
        Node* n = hm.hashTable[i];
        Node** p = &hashTable[i];
        *p = NULL;
        while (n)
        {
            Node* c = new Node(*n); // node copy
constructor, should set n->next to null
            *p = c;
            p=&c->next;
            n=n->next;
        }
    }
}

If you don't want Node copy constructor replace Node* c = new Node(*n); with:

        Node* c = new Node;
        c->key = n->key;
        c->value = n->value;
        c->next = NULL;

Categories : C++

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