mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
synced 2025-12-26 01:50:08 +01:00
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
// SPDX-License-Identifier: LGPL-2.1+
|
|
/* NetworkManager -- Network link manager
|
|
*
|
|
* (C) Copyright 2017 Red Hat, Inc.
|
|
*/
|
|
|
|
#ifndef __NM_OBJ_H__
|
|
#define __NM_OBJ_H__
|
|
|
|
/*****************************************************************************/
|
|
|
|
#define NM_OBJ_REF_COUNT_STACKINIT (G_MAXINT)
|
|
|
|
typedef struct _NMObjBaseInst NMObjBaseInst;
|
|
typedef struct _NMObjBaseClass NMObjBaseClass;
|
|
|
|
struct _NMObjBaseInst {
|
|
/* The first field of NMObjBaseInst is compatible with GObject.
|
|
* Basically, NMObjBaseInst is an abstract base type of GTypeInstance.
|
|
*
|
|
* If you do it right, you may derive a type of NMObjBaseInst as a proper GTypeInstance.
|
|
* That involves allocating a GType for it, which can be inconvenient because
|
|
* a GType is dynamically created (and the class can no longer be immutable
|
|
* memory).
|
|
*
|
|
* Even if your implementation of NMObjBaseInst is not a full fledged GType(Instance),
|
|
* you still can use GTypeInstances in the same context as you can decide based on the
|
|
* NMObjBaseClass with what kind of object you are dealing with.
|
|
*
|
|
* Basically, the only thing NMObjBaseInst gives you is access to an
|
|
* NMObjBaseClass instance.
|
|
*/
|
|
union {
|
|
const NMObjBaseClass *klass;
|
|
GTypeInstance g_type_instance;
|
|
};
|
|
};
|
|
|
|
struct _NMObjBaseClass {
|
|
/* NMObjBaseClass is the base class of all NMObjBaseInst implementations.
|
|
* Note that it is also an abstract super class of GTypeInstance, that means
|
|
* you may implement a NMObjBaseClass as a subtype of GTypeClass.
|
|
*
|
|
* For that to work, you must properly set the GTypeClass instance (and its
|
|
* GType).
|
|
*
|
|
* Note that to implement a NMObjBaseClass that is *not* a GTypeClass, you wouldn't
|
|
* set the GType. Hence, this field is only useful for type implementations that actually
|
|
* extend GTypeClass.
|
|
*
|
|
* In a way it is wrong that NMObjBaseClass has the GType member, because it is
|
|
* a base class of GTypeClass and doesn't necessarily use the GType. However,
|
|
* it is here so that G_TYPE_CHECK_INSTANCE_TYPE() and friends work correctly
|
|
* on any NMObjectClass. That means, while not necessary, it is convenient that
|
|
* a NMObjBaseClass has all members of GTypeClass.
|
|
* Also note that usually you have only one instance of a certain type, so this
|
|
* wastes just a few bytes for the unneeded GType.
|
|
*/
|
|
union {
|
|
GType g_type;
|
|
GTypeClass g_type_class;
|
|
};
|
|
};
|
|
|
|
/*****************************************************************************/
|
|
|
|
#endif /* __NM_OBJ_H__ */
|