Hi Ben, > I've found a few macros for casts useful over years. PSPP uses > CONST_CAST and UP_CAST from the file below quite a bit: > https://git.savannah.gnu.org/cgit/pspp.git/tree/src/libpspp/cast.h
That's pointing to a nice solution to the problem that casts don't warn in C. I use to write code like void *p = ...; int *q = (int *) p; because I want the reader of the program to be aware that there is a cast. Paul uses to write code like void *p = ...; int *q = p; because he wants the compiler to issue warnings if the type of p is changed to something else. It would be cool to have the advantages of both approaches: void *p = ...; int *q = SAFE_CAST (int *, p); that would indicate that there is a cast AND warn if 'int *' and 'void *' are not compatible. Can you implement SAFE_CAST with the techniques from PSPP, or is Marc's approach needed? Btw, I like Marc's approach of using _Generic for warning purposes on newer compilers, and still maintain compatibility with older compilers. Bruno
