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

typeid can be used to get the type of variable most of the time. It is compiler dependent and I've seen it give strange results. g++ has RTTI on by default, not sure on the Windows side.

#include 
#include 
#include 
#include 
#include 

typedef std::ratio<1, 1> sec;
int main()
{
    auto tickTime = .001;
    std::chrono::duration timePerTick2{0.001};
    auto nextTickTime = std::chrono::high_resolution_clock::now() + timePerTick2;
    std::cout << typeid(tickTime).name() << std::endl;
    std::cout << typeid(nextTickTime).name() << std::endl;

    return 0;
}

./a.out | c++filt

double
std::__1::chrono::time_point > >