The biggest mistake of C was CPP Hey, we can eliminate the currently needed (PetscObject) cast in a bunch of places with this horrible trick. This actually doesn't introduce any more macros, its the same number with more reasonable naming. Barry On Apr 5, 2013, at 7:50 PM, Jed Brown <[email protected]> wrote:

On Fri, Apr 5, 2013 at 7:40 PM, Barry Smith <[email protected]> wrote: (lldb) b PetscFunctionListAdd Breakpoint 4: no locations (pending). WARNING: Unable to resolve breakpoint to any actual locations. (lldb) b PetscFunctionListAdd_Private Breakpoint 5: where = libpetsc.dylib`PetscFunctionListAdd_Private + 23 at reg.c:173, address = 0x000000010a1d3697

The solution to too many macros is always MOAR MACROS!

This is valid:

PETSC_EXTERN PetscErrorCode PetscFunctionListAdd(PetscFunctionList*,const char[],void (*)(void)); #define PetscFunctionListAdd(list,name,fptr) PetscFunctionListAdd((list),(name),(PetscVoidFunction)(fptr))

off in the implementation:

#undef PetscFunctionListAdd PETSC_EXTERN PetscErrorCode PetscFunctionListAdd(PetscFunctionList *fl,const char name[],void (*fnc)(void)) { ... }

This would make the debugging thing work, at the expense of being slightly more confusing to the reader. But maybe comments would be enough to explain what's going on?