With the following setup, valac fails to automatically convert get_contacts_by_handle_cb() to ConnectionContactsByHandleCb. If I add the "static" keyword to the declaration of get_contacts_by_handle_cb(), then the conversion works as expected.


=============================
.vapi file
=============================

        public delegate void ConnectionContactsByHandleCb (Tp.Connection connection, uint n_contacts, Tp.Contact[] contacts, uint n_failed, Tp.Handle[] failed, GLib.Error error, void* user_data, GLib.Object weak_object);

=============================
Source file
=============================

using GLib;
using Gee;
using Tp.Individual;
using Tp.Channel;
using Tp.ConnectionContactsByHandleCb;
using Tp.Contact;
using Tp.ContactFeature;
using Tp.Handle;
using Tp.Account;
using Tp.AccountManager;
using Tp.Lowlevel;

...

        private void get_contacts_by_handle_cb (Tp.Connection connection,
                        uint n_contacts,
                        Tp.Contact[] contacts,
                        uint n_failed,
                        Tp.Handle[] failed,
                        GLib.Error error,
                        void* user_data,
                        GLib.Object weak_object) {
            ...
        }


...
                this.conn.get_contacts_by_handle (handles_array_length,
                                handles_array, features.length, features,
                                this.get_contacts_by_handle_cb, null, null,
                                this.conn);
                                
=============================
Build Error
=============================

make[2]: *** [telepathy-people.vala.stamp] Error 1
make[2]: *** Waiting for unfinished jobs....
persona-store.vala:105.33-105.62: error: Argument 5: Cannot convert from `Tp.PersonaStore.get_contacts_by_handle_cb' to `Tp.ConnectionContactsByHandleCb'
                                this.get_contacts_by_handle_cb, null, null,
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^