Hello,
Trying to create ldap bindings I found the following questions in my head:
I was trying to make bindings not just to make `ptr ptr Ldap` or `pointer` but
reduce amount of work to wrap it later
On the C-side:
typedef struct ldap LDAP;
int ldap_initialize(ldp **LDAP, const char *url);
Run
It is pretty standard for C to have double ref to initialize something on
pointer
The first idea was to make simple, but wrong because Nim does not expect that
ref can be changed
type LdapRef = ref object
proc ldap_initialize(ldp: var LdapRef, url: csring) {.importc.}
var ldp: LdapRef
ldap_initialize(ldp, "url")
Run
But the second idea became more complicate:
type Ldap = object
type LdapInit = object
r: ptr Ldap
proc ldap_initialize(ldp: var LdapInit, url: csring) {.importc.}
var ldpInit: LdapInit
ldap_initialize(ldpInit, "url")
Run
or to remove var and make LdapInit = ref object
Because we own the Ldap structure we are responsible to free it, and I added
proc `=destroy`(x: var BerVal) =
ldap_free x.r # the same like simple free
Run
The question is that the second way looks +- ok, but a bit overcomplicated for
the simple problem.
Questions are:
* Is it possible to make it without additional LdapInit structure but without
`ptr ptr` also?
* Is it possible to own the ptr from Nim to make the destructor unnecessary
and Nim will free it automatically?
