On 2/21/12 4:48 AM, foobar wrote:
On Tuesday, 21 February 2012 at 02:23:58 UTC, Andrei Alexandrescu wrote:
On 2/20/12 7:02 PM, Juan Manuel Cabo wrote:
oops, sorry!! I just saw a post by someone named Jose. My thousand
apollogies!!
I got confused. It was your argument I meant to refer to - adding info
to the exception in flight.
Andrei
I'd implement this along these lines:
class WithErrorCode(E) : E {
int errorCode;
this(Args)(int err, Args args) { this.errorCode = err; super(args); }
}
and add this wrapper where relevant. e.g. replace:
throw new FileNotFoundException(...);
with something like:
throw new WithErrorCode!FileNotFoundException(-1, ...);
This is a localized change that doesn't affect all uses of exceptions
and it remains type-safe. surely this is a better solution than the hash
table?
The two approaches don't compete as one is static and the other is
dynamic. For example, how does one add contextual information "While
opening table in {database}" to the current exception of type
WithErrorCode!FileNotFoundException?
Andrei
