bson_mem_set_table()

typedef struct _bson_mem_vtable_t
{
   void *(*malloc)    (size_t  num_bytes);
   void *(*calloc)    (size_t  n_members,
                       size_t  num_bytes);
   void *(*realloc)   (void   *mem,
                       size_t  num_bytes);
   void  (*free)      (void   *mem);
   void *padding [4];
} bson_mem_vtable_t;

void bson_mem_set_vtable (const bson_mem_vtable_t *vtable);