Node<D> *get_head() {
		return _head;
	}

	void TerTree<T>::map_element(TerTree<T> *tree, const Node<T> *node, T(*func)(const T &)) const;

	void TerTree<T>::map(TerTree<T> *tree, T(*func)(const T &)) const;


^^^^^^^^^^^ VSE ETO V class TerTree

template <class T>
void TerTree<T>::map_element(TerTree<T> *tree, const Node<T> *node, T(*func)(const T &)) const {
	if (node) {
		tree->addNode(func(node->getData()));
		if (node->getLeft())
			map_element(tree, node->getLeft(), func);
		if (node->getCenter())
			map_element(tree, node->getCenter(), func);
		if (node->getRight())
			map_element(tree, node->getRight(), func);


	}
}

template <class T>
void TerTree<T>::map(TerTree<T> *tree, T(*func)(const T &)) const {
	if (!tree) {
		cout << "Nullptr passed as destination tree." << endl;
		return;
	}
	if (!func) {
		cout << "Nullptr passed as function." << endl;
		return;
	}
	map_element(tree, this->get_head(), func);
}

^^^^^^^^^^^^^^^^^^^^^^^^^ VSE ETO VNE KLASSA TerTree