On Thu, 2008-07-17 at 13:39 -0700, Eric Rannaud wrote:
> Here is a list of use cases for conditional compilation that I've come
> across (note that it includes #ifdef in header files):
> - disabling debug code,
> - feature selection,
> - choosing code path from constants,
> - exposing/hiding interfaces depending on context,
Oh, and there is another case I forget, for which you would need
language support:
struct a {
int x, y;
#ifdef DEPRECATED_FEATURE /* too go in 2 revisions */
char c;
#endif
};
Of course, I guess one can do that with type classes. But is it worth
the trouble? And there is no 'deriving' (cf. Haskell) in BitC, is
there?
I can't think of a way of doing in BitC, without conditional
compilation, the equivalent of
void foo(struct a *a, int p)
{
a->x = p;
a->y = 2*p;
#ifdef DEPRECATED_FEATURE
a->c = '0';
#endif
}
without duplicating at least some code (the point being that the
difference introduced by DEPRECATED_FEATURE is in the definition of the
type 'struct a').
Any idea?
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