On 02/14/2020 06:51 AM, Sl�vek Banko wrote: > Probably such can be removed as well. > Yes, in the past 'register' was a hint to the compiler to keep that value stored in a register for faster access (a holdover from C). It was deprecated in C++11 and slated for removal in C++17. See: open-std.org Doc. no. N4340 http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4340.html -- David C. Rankin, J.D.,P.E.