cppBeginner questions

• Does "if constexpr(something false)" ALWAYS omit template instantiation
• inject implementation to a single multi-function interface class - many CRTP classes?
• Is it safe to use "yes","no","i","out" as name for variables/enum?
• Cache a lot of callback, then call them all batch-ly without v-table cost
• minimize byte wasted to align data between 2 headers (custom allocator)
• easily refactoring many non-trivial "static library projects" to "dll projects"
• explicit instantiation of function using decltype : work on g++ but not on Visual C++

cppBeginner answers