1 #ifndef foopulseobjecthfoo 2 #define foopulseobjecthfoo 3 4 /*** 5 This file is part of PulseAudio. 6 7 Copyright 2004-2006 Lennart Poettering 8 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB 9 10 PulseAudio is free software; you can redistribute it and/or modify 11 it under the terms of the GNU Lesser General Public License as published 12 by the Free Software Foundation; either version 2.1 of the License, 13 or (at your option) any later version. 14 15 PulseAudio is distributed in the hope that it will be useful, but 16 WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 General Public License for more details. 19 20 You should have received a copy of the GNU Lesser General Public License 21 along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. 22 ***/ 23 24 #include <sys/types.h> 25 26 #include <pulse/xmalloc.h> 27 #include <pulsecore/refcnt.h> 28 #include <pulsecore/macro.h> 29 30 typedef struct pa_object pa_object; 31 32 struct pa_object { 33 PA_REFCNT_DECLARE; 34 const char *type_id; 35 void (*free)(pa_object *o); 36 bool (*check_type)(const char *type_name); 37 }; 38 39 pa_object *pa_object_new_internal(size_t size, const char *type_id, bool (*check_type)(const char *type_id)); 40 #define pa_object_new(type) ((type*) pa_object_new_internal(sizeof(type), type##_type_id, type##_check_type)) 41 42 #define pa_object_free ((void (*) (pa_object* _obj)) pa_xfree) 43 44 bool pa_object_check_type(const char *type_id); 45 46 extern const char pa_object_type_id[]; 47 pa_object_isinstance(void * o)48static inline bool pa_object_isinstance(void *o) { 49 pa_object *obj = (pa_object*) o; 50 return obj ? obj->check_type(pa_object_type_id) : true; 51 } 52 53 pa_object *pa_object_ref(pa_object *o); 54 void pa_object_unref(pa_object *o); 55 pa_object_refcnt(pa_object * o)56static inline int pa_object_refcnt(pa_object *o) { 57 return o ? PA_REFCNT_VALUE(o) : 0; 58 } 59 pa_object_cast(void * o)60static inline pa_object* pa_object_cast(void *o) { 61 pa_object *obj = (pa_object*) o; 62 pa_assert(!obj || obj->check_type(pa_object_type_id)); 63 return obj; 64 } 65 66 #define pa_object_assert_ref(o) pa_assert(pa_object_refcnt(o) > 0) 67 68 #define PA_OBJECT(o) pa_object_cast(o) 69 70 #define PA_DECLARE_CLASS_COMMON(c) \ 71 static inline bool c##_isinstance(void *o) { \ 72 pa_object *obj = (pa_object*) o; \ 73 return obj ? obj->check_type(c##_type_id) : true; \ 74 } \ 75 static inline c* c##_cast(void *o) { \ 76 pa_assert(c##_isinstance(o)); \ 77 return (c*) o; \ 78 } \ 79 static inline c* c##_ref(c *o) { \ 80 return (c *) ((void *) pa_object_ref(PA_OBJECT(o))); \ 81 } \ 82 static inline void c##_unref(c* o) { \ 83 pa_object_unref(PA_OBJECT(o)); \ 84 } \ 85 static inline int c##_refcnt(c* o) { \ 86 return pa_object_refcnt(PA_OBJECT(o)); \ 87 } \ 88 static inline void c##_assert_ref(c *o) { \ 89 pa_object_assert_ref(PA_OBJECT(o)); \ 90 } \ 91 struct __stupid_useless_struct_to_allow_trailing_semicolon 92 93 #define PA_DECLARE_PUBLIC_CLASS(c) \ 94 extern const char c##_type_id[]; \ 95 PA_DECLARE_CLASS_COMMON(c); \ 96 bool c##_check_type(const char *type_id) 97 98 #define PA_DEFINE_PUBLIC_CLASS(c, parent) \ 99 const char c##_type_id[] = #c; \ 100 bool c##_check_type(const char *type_id) { \ 101 if (type_id == c##_type_id) \ 102 return true; \ 103 return parent##_check_type(type_id); \ 104 } \ 105 struct __stupid_useless_struct_to_allow_trailing_semicolon 106 107 #define PA_DEFINE_PRIVATE_CLASS(c, parent) \ 108 static const char c##_type_id[] = #c; \ 109 PA_DECLARE_CLASS_COMMON(c); \ 110 static bool c##_check_type(const char *type_id) { \ 111 if (type_id == c##_type_id) \ 112 return true; \ 113 return parent##_check_type(type_id); \ 114 } \ 115 struct __stupid_useless_struct_to_allow_trailing_semicolon 116 117 #endif 118