Is static_cast(-1) the right way to generate all-one-bits data without numeric_limits?

Question

I\'m writing C++ code in an environment in which I don\'t have access to the C++ standard library, specifically not to std::numeric_limits. Suppose I want to implem

Answer 1

Focusing on unsigned integral types, what do I put there? Specifically, is static_cast(-1) good enough

If you're only concerned about unsigned types, yes, converting -1 is correct for all standard C++ implementations. Operations on unsigned types, including conversions of signed types to unsigned types, are guaranteed to work modulo (max+1).