SBRM/RAII for std::va_list/va_start()/va_end use

Question

My code contains snippets like these:

    std::va_list ap;
    va_start(ap, msgfmt);
    snprintf_buf buf;
    const tchar * msg = buf.print_va_list(msgfmt, ap);         


        

Answer 1

Unfortunately, no. The specification of va_start and va_end requires that:

Each invocation of the va_start and va_copy macros shall be matched by a corresponding invocation of the va_end macro in the same function.

Therefore, va_end must be in the variadic function itself, not a class destructor.