"using" keyword – passing iterator to function

  alias, c++, constructor, templates, using

I am writing a class Sequence. Its constructor takes two templated vector iterators as arguments.
Here is the code:

template <class T> using ConstIterator_t = typename std::vector<T>::const_iterator;
template <class T>
class Sequence{
Sequence(ConstIterator_t start, ConstIterator_t end);
//rest of the code

When I compile the code it shows me this error: expected ‘)’ before ‘start’.

Could you please help me?
Many thanks in advance.

[edit] By the way, when I change ConstIterator_t with its defintion, the error disappears.

Source: Windows Questions C++