Printers::Printers(const Printers& p)
{
	auto it = p.index.begin();
	while (it != p.index.end()) {
		index.insert({it -> first, it -> second -> clone()});
		it++;
	}
}

Printers& Printers::operator=(const Printers& p)
{

	auto it = index.begin();
	while (it != index.end()) {
		delete it -> second;
		index.erase(it -> first);
		it++;
	}
	auto jt = p.index.begin();
	while (jt != p.index.end()) {
		this -> add(jt -> first, jt -> second -> clone());
		jt++;
	}
	return *this;
}