Std::Chrono

[VladLio]

I'm slightly lost with chrono, duration and ratio.
Just an idea to do a Time sum.
std::chrono::time_pointstd::chrono::steady_clock a, b, c
for(...) {
a = std::chrono::steady_clock::now();
...
b = std::chrono::steady_clock::now();

c += b - a ???? doesn't compile

auto c { b-a} .... that's ok but it's not the purpose (it's not the sum)
}.
Pretty hard to be familiar with these "intricate class"... just for that case i have rewritten a single tickount class... but there is a usage to know ... Any ideas ???