On 27.07.22 01:58, David G. Johnston wrote:
Admittedly I'm still getting my head around reading pointer-using code
(I get the general concept but haven't had to code them)....
- lockrelid = palloc(sizeof(*lockrelid));
+ lockrelid = palloc_ptrtype(lockrelid);
// This definitely seems like an odd idiom until I remembered about
short-lived memory contexts and the lost pointers are soon destroyed there.
So lockrelid (no star) is a pointer that has an underlying reference
that the macro (and the orignal code) resolves via the *
I cannot reason out whether the following would be equivalent to the above:
lockrelid = palloc_obj(*lockrelid);
I think that would also work.
Ultimately, it would be more idiomatic (in Postgres), to write this as
lockrelid = palloc(sizeof(LockRelId));
and thus
lockrelid = palloc_obj(LockRelId);
