Question

Is there a way to avoid writing std::vector<int> twice on lines such as these?

std::vector<int>* numbers = new std::vector<int>(7);

(Typedefs don’t count.)

Answer 1

Yes. In C++11 only:

auto numbers = new std::vector<int>(7); //C++11 only

Here the type of numbers is inferred by the compiler, and it turns out to be std::vector<int>* which is what you’ve written in your code.

But wait. Why would use new in the first place?

Do you have any strong reason for that? Most likely not. Use automatic object instead:

std::vector<int> numbers; //no new