Using 'auto' type deduction - how to find out what type the compiler deduced?

Question

How can I find out what type the compiler deduced when using the auto keyword?

Example 1: Simpler

auto tickTime = 0.001;

W

Answer 1

A lo-fi trick that doesn't require any prior helper definitions is:

typename decltype(nextTickTime)::_

The compiler will complain that _ isn't a member of whatever type nextTickTime is.