std::vector has two parameters, type and allocator.
Try this
template <typename T, typename Alloc, template <typename, typename> class V>
void print_container(V<T, Alloc> &con)
{
}
print_container(vec);
This will work for vector, list, etc., but will not work with map, set.
However, since you use auto you can use C++11 and then you can to this:
template <typename T, template <typename, typename...> class V, typename... Args>
void print_container(V<T, Args...> &con)
or
template <template <typename, typename...> class V, typename... Args>
void print_container(V<Args...> &con)
and of course most simple way is to do something like
template<typename C>
void print_container(C& con)
probably with some checks for deduce, that C is really container.
template<typename C>
auto print_container(C& con) -> decltype(con.begin(), void())