Compile-time self-testing macro wrappers

Compile-time self-testing macro wrappers

Here's an idea for combining the runtime debug wrapper function idea with some additional compile-time tests using static_assert.

    #define memset_wrapper(addr,ch,n) ( \
        static_assert(n != 0), \
        static_assert(ch == 0), \
        memset_wrapper((addr),(ch),(n),__FILE__,__LINE__,__func__))

The idea is interesting, but it doesn't really work, because not all calls to the memset wrapper will have constant arguments for the character or the number of bytes, so the static_assert commands will fail in that case. You could use standard assertions, but this adds runtime cost. Note that it's a self-referential macro, but that C++ guarantees it only gets expanded once (i.e., there's no infinite recursion of preprocessor macros).