[Vala] Writing bindings as legacy

[Gonzalo Aguilar Delgado <gaguilar aguilardelgado com>]

Hi,

I my case (rados lib) I found non standard anyway and trying hard to 
figure out how to do the binding. Maybe someone can help.

I managed to create some kind of working stuff but I think is not really 
good with lot's of variable copying in generated code.

[ The problem ]

Rados want's a (void *) (formally rados_t) to be initialized on startup. 
This is done with rados_create2 function:

    int rados_create2(rados_t *pcluster, const char *const clustername,
              const char * const name, uint64_t flags);

What I did is:

Map flags: (ok)

    [SimpleType]
    [IntegerType (rank = 11)]
    [CCode (cname = "uint64_t", has_type_id = false)]
publicstruct Flags {
    }


Create a cluster client:


    [CCode (cheader_filename = "rados/librados.h", cname = 
"void", free_function = "rados_shutdown", has_type_id = false)]
    [Compact]
publicclass ClusterClient {
        [CCode (cheader_filename = "rados/librados.h", cname = 
"rados_create2")]
protectedstaticint create (ref unowned ClusterClient client, 
string? cluster_name, string? user_name, Flags flags);

publicstatic unowned ClusterClient? from_config(string? cluster_name, 
string? user_name, Flags flags) {
            unowned ClusterClient result = null;
if(create(ref result, cluster_name, user_name, flags)<0){
                result = null;
            }
return result;
        }


    }

I code I do:

    Rados.Flags flags=0;
    unowned Rados.ClusterClient cluster = Rados.ClusterClient.from_config("ceph", "client.admin", flags);



But this makes a lot of problems in code. And of course, not calling 
rados_shutdown because unowned.

What I want is to do it in a way it's everything handled in the 
constructor with no static method, but don't find how to do it.

What I really want to do is:

    Rados.Flags flags=0;
Rados.ClusterClient cluster = Rados.ClusterClient("ceph", 
"client.admin", flags);

And the result of the rados_create2 (first argument) being copied to 
cluster var as instance object.

How should I do it?

Any help will be appreciated.