I am trying to implement the insert function, which inserts a new value into a hash table.

I am getting a compile error though which doesn't make sense to me.

To outline my data structure, I have a hash_set which includes a vector<HashNode*> m_table. Each HashNode is constructed like a node in a doubly linked list, so each HashNode has a 'next' and 'prev' where the end node points to 0.

My compilation error is this.

Code:

hash_set.h: In member function ‘std::pair<hash_set<KeyType, HashFunc>::iterator, bool> hash_set<KeyType, HashFunc>::insert(const KeyType&)’:
hash_set.h:185: error: name lookup of ‘pt’ changed for new ISO ‘for’ scoping
hash_set.h:181: error: using obsolete binding at ‘pt’

And here is my code.

Code:

// Insert the key if it is not already there.
std::pair< iterator, bool > insert( KeyType const& key )
{
const float LOAD_FRACTION_FOR_RESIZE = 1.25;
// Resize if necessary.
if ( m_size >= LOAD_FRACTION_FOR_RESIZE * m_table.size() )
this->resize_table( 2*m_table.size()+1 ); // making the new and old sizes relatively prime breaks up clusters
if (find(key)==end())
return std::make_pair(end(),false);
else {
unsigned int hash_value = m_hash(key);
unsigned int index = hash_value%m_table.size();
for (HashNode* pt = m_table[index];pt->next;pt=pt->next) {
if (pt->key == key)
return std::make_pair(iterator(this,index,pt),false);
}
pt->key=key;
return std::make_pair(iterator(this,index,pt),true);
}
}