Question

I’ve been getting this error, and I can’t figure out how to fix it:

btree.tem:98:   instantiated from 'std::pair<typename btree<T>::iterator, bool> btree<T>::insert(const T&) [with T = char]'
test.cpp:13:   instantiated from here
btree.tem:37: error: no matching function for call to 'btree<char>::addElem(std::_List_iterator<node<char>*>&, node<char>*&)'
btree.h:178: note: candidates are: void btree<T>::addElem(std::_List_iterator<node<T>*>&, node<T>&) [with T = char]
btree.tem:98:   instantiated from 'std::pair<typename btree<T>::iterator, bool> btree<T>::insert(const T&) [with T = char]'
test.cpp:13:   instantiated from here
btree.tem:48: error: no matching function for call to 'btree<char>::addElem(std::_List_iterator<node<char>*>&, node<char>*&)'

Inside my header file I have this setter function:

void addElem (std::_List_iterator<node<T>*>& itr, node <T>& n) {
  neighbours.insert(itr, n); 
}

and I don’t know what’s wrong with it. The error seems to happen whenever I call it like this:

class list < node<T>* >::iterator itr = bt->level().begin();
node <T>*n = new node<T>(elem, bt->max());
bt->addElem(itr, n);

What is the problem?

Answer 1

The compiler is looking for:

btree<char>::addElem(std::_List_iterator<node<char>*>&, node<char>*&)

But it only found something for:

btree<char>::addElem(std::_List_iterator<node<char>*>&, node<char>&)

You’re passing a pointer to your function. You’ve not defined an addElem that takes a pointer as its last argument.