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

I like to use idea from Effective Modern C++ which uses non-implemented template; the type is output with compiler error:

 template struct TD;

Now for auto variable var, after its definition add:

 TD td;

And watch error message for your compiler, it will contain type of var.