func (v *Value) SetInstance(instance uintptr) {
	C.g_value_set_instance(v.native(), C.gpointer(instance))
}
func (v *Value) SetInstance(instance uintptr) {
	C.g_value_set_instance(v.native(), C.gpointer(instance))
}
// SetInstance is a wrapper around g_value_set_instance().