Having trouble printing out values from a map of maps

Hi guys, as the title states, I'm having some trouble going through a map of maps and printing out all of the values. Here is my declaration of the map:

Code:

map<T, map<T, int> > adjList;

And here is my Display function:

Code:

template<typename T>
void Graph<T>::display() const
{
	map<T, map<T, int> >::iterator iter;
	for (iter = adjList.begin(); iter != adjList.end(); ++iter)
	{
		cout << iter->first << endl;
		map<T, int>::iterator pos;
		for (pos = adjList[iter->first].begin(); pos != adjList[iter->first].end(); ++pos) 
		{
			cout << pos->first << "  " << pos->second << endl;
		}
	}
}

When I try to compile this, I get the follow error:

Code:

error C2679: binary '=' : no operator found which takes a right-hand operand of type 
'std::_Tree_const_iterator<_Mytree>' (or there is no acceptable conversion)

I'm pretty new to using iterators for this type of thing, and completely new to maps as well. Any help would be appreciated.

I cannot reproduce your problem. Can you post a simple compilable example that demonstrates the problem?

How about

Code:

for (pos = iter->second.begin(); pos != iter->second.end(); ++pos)
{
    cout << pos->first << "  " << pos->second << endl;
}

Not 100% sure about this, but perhaps since you have a const member function and are using non-const iterators? The error message makes reference to const_iterator.

error C2679: binary '=' : no operator found which takes a right-hand operand of type
'std::_Tree_const_iterator<_Mytree>' (or there is no acceptable conversion)

Yes, the problem was using a non-const iterator in a const function. Thanks. Also used Caligulaminus code in place of mine; that is working too.