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

This disarmingly direct way.

T allOnes;
memset(&allOnes, ~0, sizeof(T));