How to do portable 64 bit arithmetic, without compiler warnings

Question

I occasionally use 64 bit arithmetic in an open source C++ library of mine. I discovered that long long serves my purpose quite nicely. Even some 10 year old solari

Answer 1

You could replace your use of long long with one of the many C++ bigint libraries. I'm sure some of them avoid this compiler error. Personally, I'd rather stick with the error.