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Once the interface is defined, implementing it is rather trivial.
The first step is to define a normal final GObject class exactly as in the section called “Boilerplate header code”.
The second step is to implement MamanBaz by defining
it using
G_DEFINE_TYPE_WITH_CODE
and
G_IMPLEMENT_INTERFACE
instead of
G_DEFINE_TYPE:
static void maman_ibaz_interface_init (MamanIbazInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MamanBar, maman_bar, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (MAMAN_TYPE_IBAZ,
maman_ibaz_interface_init))
This definition is very much like all the similar functions seen
previously. The only interface-specific code present here is the use of
G_IMPLEMENT_INTERFACE.
Classes can implement multiple interfaces by using multiple calls to
G_IMPLEMENT_INTERFACE
inside the call to
G_DEFINE_TYPE_WITH_CODE
maman_baz_interface_init, the interface
initialization function: inside it every virtual method of the interface
must be assigned to its implementation:
static void
maman_baz_do_action (MamanBaz *self)
{
g_print ("Baz implementation of Ibaz interface Action: 0x%x.\n",
self->instance_member);
}
static void
maman_baz_do_something (MamanBaz *self)
{
g_print ("Baz implementation of Ibaz interface Something: 0x%x.\n",
self->instance_member);
}
static void
maman_ibaz_interface_init (MamanIbazInterface *iface)
{
iface->do_action = maman_baz_do_action;
iface->do_something = maman_baz_do_something;
}
static void
maman_baz_init (MamanBaz *self)
{
self->instance_member = 0xdeadbeef;
}