On Fri, 01 Jul 2011 18:24:08 +0200, Timon Gehr <timon.g...@gmx.ch> wrote:
The child's contract says: If my parent's contract failed, I can still
satisfy the
postcondition, if this _alternative_ precondition holds. But it does not
necessarily have to pass on all input the parent passes on, because it
does not
even get checked if the parent's precondition holds.
If you add such a check, the child's in-contract will have to carefully
duplicate
the parent's precondition in order not to provoke a nonsensical
runtime-error.
Adding such a check would make D's contracts unusable in anything but
the most
trivial cases.
(Analogously, the child's 'out'-contract does not have to re-check the
parent's
postcondition.)
'Capiche?' ;)
Absolutely. I was in the process of answering your other post where you
outlined this. Believe me, I'm on your side now. :p
--
Simen
