code.delx.au - pulseaudio/blob - src/pulsecore/object.h

   1 #ifndef foopulseobjecthfoo
   2 #define foopulseobjecthfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2004-2006 Lennart Poettering
  10   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
  11
  12   PulseAudio is free software; you can redistribute it and/or modify
  13   it under the terms of the GNU Lesser General Public License as published
  14   by the Free Software Foundation; either version 2 of the License,
  15   or (at your option) any later version.
  16
  17   PulseAudio is distributed in the hope that it will be useful, but
  18   WITHOUT ANY WARRANTY; without even the implied warranty of
  19   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20   General Public License for more details.
  21
  22   You should have received a copy of the GNU Lesser General Public License
  23   along with PulseAudio; if not, write to the Free Software
  24   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  25   USA.
  26 ***/
  27
  28 #include <string.h>
  29 #include <sys/types.h>
  30
  31 #include <pulse/xmalloc.h>
  32 #include <pulsecore/refcnt.h>
  33 #include <pulsecore/macro.h>
  34
  35 typedef struct pa_object pa_object;
  36
  37 struct pa_object {
  38     PA_REFCNT_DECLARE;
  39     const char *type_name;
  40     void (*free)(pa_object *o);
  41     int (*check_type)(const char *type_name);
  42 };
  43
  44 pa_object *pa_object_new_internal(size_t size, const char *type_name, int (*check_type)(const char *type_name));
  45 #define pa_object_new(type) ((type*) pa_object_new_internal(sizeof(type), #type, type##_check_type)
  46
  47 #define pa_object_free ((void (*) (pa_object* o)) pa_xfree)
  48
  49 int pa_object_check_type(const char *type);
  50
  51 static inline int pa_object_isinstance(void *o) {
  52     pa_object *obj = (pa_object*) o;
  53     return obj ? obj->check_type("pa_object") : 0;
  54 }
  55
  56 pa_object *pa_object_ref(pa_object *o);
  57 void pa_object_unref(pa_object *o);
  58
  59 static inline int pa_object_refcnt(pa_object *o) {
  60     return o ? PA_REFCNT_VALUE(o) : 0;
  61 }
  62
  63 static inline pa_object* pa_object_cast(void *o) {
  64     pa_object *obj = (pa_object*) o;
  65     pa_assert(!obj || obj->check_type("pa_object"));
  66     return obj;
  67 }
  68
  69 #define pa_object_assert_ref(o) pa_assert(pa_object_refcnt(o) > 0)
  70
  71 #define PA_OBJECT(o) pa_object_cast(o)
  72
  73 #define PA_DECLARE_CLASS(c)                                             \
  74     static inline int c##_isinstance(void *o) {                         \
  75         pa_object *obj = (pa_object*) o;                                \
  76         return obj ? obj->check_type(#c) : 1;                           \
  77     }                                                                   \
  78     static inline c* c##_cast(void *o) {                                \
  79         pa_assert(c##_isinstance(o));                                   \
  80         return (c*) o;                                                  \
  81     }                                                                   \
  82     static inline c* c##_ref(c *o) {                                    \
  83         return (c*) pa_object_ref(PA_OBJECT(o));                        \
  84     }                                                                   \
  85     static inline void c##_unref(c* o) {                                \
  86         pa_object_unref(PA_OBJECT(o));                                  \
  87     }                                                                   \
  88     static inline int c##_refcnt(c* o) {                                \
  89         return pa_object_refcnt(PA_OBJECT(o));                          \
  90     }                                                                   \
  91     static inline void c##_assert_ref(c *o) {                           \
  92         pa_object_assert_ref(PA_OBJECT(o));                             \
  93     }                                                                   \
  94     struct __stupid_useless_struct_to_allow_trailing_semicolon
  95
  96 #define PA_DEFINE_CHECK_TYPE(c, parent)                                 \
  97     int c##_check_type(const char *type) {                              \
  98         pa_assert(type);                                                \
  99         if (strcmp(type, #c) == 0)                                      \
 100             return 1;                                                   \
 101         return parent##_check_type(type);                               \
 102     }                                                                   \
 103     struct __stupid_useless_struct_to_allow_trailing_semicolon
 104
 105
 106 #endif