>> * Would you ever like to avoid reserved identifiers in such source code? >> https://wiki.sei.cmu.edu/confluence/display/c/DCL37-C.+Do+not+declare+or+define+a+reserved+identifier > > we already don't care about this guideline (see __guard_ptr()) Please take another look at name conventions. How do you think about to avoid that this software depends on undefined behaviour? Regards, Markus