Factor variable operations, as they're always the same for a type

include/vlc_common.h

@@ -139,7 +139,6 @@ static inline void __vlc_fourcc_to_char( vlc_fourcc_t fcc, char *psz_fourcc )
 typedef struct vlc_list_t vlc_list_t;
 typedef struct vlc_object_t vlc_object_t;
 typedef struct libvlc_int_t libvlc_int_t;
-typedef struct variable_t variable_t;
 typedef struct date_t date_t;
 typedef struct dict_entry_t dict_entry_t;
 typedef struct dict_t dict_t;

src/libvlc.h

@@ -25,6 +25,8 @@
 #ifndef LIBVLC_LIBVLC_H
 # define LIBVLC_LIBVLC_H 1
 
+typedef struct variable_t variable_t;
+
 extern const char vlc_usage[];
 
 /* Hotkey stuff */

src/misc/variables.h

@@ -30,6 +30,13 @@
 
 typedef struct callback_entry_t callback_entry_t;
 
+typedef struct variable_ops_t
+{
+    int  (*pf_cmp) ( vlc_value_t, vlc_value_t );
+    void (*pf_dup) ( vlc_value_t * );
+    void (*pf_free) ( vlc_value_t * );
+} variable_ops_t;
+
 /**
  * The structure describing a variable.
  * \note vlc_value_t is the common union for variable values
@@ -46,12 +53,7 @@ struct variable_t
     /** The variable display name, mainly for use by the interfaces */
     char *       psz_text;
 
-    /** A pointer to a comparison function */
-    int      ( * pf_cmp ) ( vlc_value_t, vlc_value_t );
-    /** A pointer to a duplication function */
-    void     ( * pf_dup ) ( vlc_value_t * );
-    /** A pointer to a deallocation function */
-    void     ( * pf_free ) ( vlc_value_t * );
+    const variable_ops_t *ops;
 
     /** Creation count: we only destroy the variable if it reaches 0 */
     int          i_usage;