OT: typesafe callbacks in C (Re: [WIP PATCH 1/7] Add skeleton RA svnclient)

Daniel Shahaf wrote:

By the way, a common pitfall is to mis-treat the void *baton argument as
the wrong type of baton.  That is, code of the form

    f(void *baton) {
        foo_baton_t *fb = baton;
    }

instead of

    f(void *baton) {
        bar_baton_t *bb = baton;
    }

Just for kicks, I should mention

  http://ccan.ozlabs.org/info/typesafe_cb.html

which makes code like this cause warnings with gcc.

Maybe some version of Subversion years from now could use it.