Le 17 juin 2011 à 13:21, David Chisnall a écrit :
> Author: theraven
> Date: Fri Jun 17 13:21:20 2011
> New Revision: 6991
>
> URL: http://svn.gna.org/viewcvs/etoile?rev=6991&view=rev
> Log:
> Make ETException work with the new ABI.
>
> Quentin: Do we actually want to enable this?
Not really, but I quite like the concept. I think it might be useful to handle
exceptions more easily and safely in an interactive environment such as a
Smalltalk workspace. For example:
Suppose you have an object with a method -do and the object can have various
possible states A, B, C etc. Now let's say some states (here B) must never be
visible from the outside, in other words by other objects that can invoke -do.
Without restartable exceptions, it's hard and tedious to restore the object to
the state A or C if an exception is raised and handled in some parent calls to
allow the program to continue cleanly. You basically need to add and expose a
method like -restoreValidState, and invokes this method in the parent call code.
- do
{
// go to from A or C to state B
if (issue)
{
[NSException raise];
}
// go back to state A or C
}
> I wrote it more as an exercise to see if it would work than as a sensible
> thing. I think I'd rather we not enable it in this version, and rewrite it
> for the next release to use an explicit resume / restart mechanism that is
> only invoked when raising ETException instances, not try to overload
> NSException with all of this stuff.
So I'll disable it for now and remove mentions about it in NEWS and README.
Cheers,
Quentin.
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