16.10.2014 14:55, Geoff Worboys wrote:
>
> I've cut the problem down to the thing that's giving me
> trouble: I want to return a non-null value when when the
> input expression resolves to null. In the code below I'm
> just trying to return a 0 (for the sake of the example).
>
> This executes but still gives me a null result:
>
> dsc* evlTestIt(Jrd::thread_db* tdbb, const SysFunction*,
> Jrd::jrd_nod* args, Jrd::impure_value* impure)
> {
> fb_assert(args->nod_count == 1);
> jrd_req* request = tdbb->getRequest();
>
> dsc* value = EVL_expr(tdbb, args->nod_arg[0]);
> if (request->req_flags & req_null)
> {
> impure->vlu_desc.makeLong(0);
> impure->vlu_desc.setNullable(false); // redundant??
request->req_flags &= ~req_null;
> return &impure->vlu_desc;
> }
> return value;
> }
Dmitry
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