struct 初始化

看到某个源码，有个关于struct初始化的问题不是太清楚。

源码如下

#define _OBJ_CONTAINER_LIST_INIT(c)     \
    {&(rt_object_container[c].object_list), &(rt_object_container[c].object_list)}
struct rt_object_information rt_object_container[RT_Object_Class_Unknown] =
{
    /* initialize object container - thread */
    {RT_Object_Class_Thread, _OBJ_CONTAINER_LIST_INIT(RT_Object_Class_Thread), sizeof(struct rt_thread)},
    ……
}

主要集中在宏 _OBJ_CONTAINER_LIST_INIT(c)上。

struct rt_object_information的定义如下

struct rt_object_information
{
    enum rt_object_class_type type;                     /**< object class type                      */
    rt_list_t object_list;                              /**< object list                            */
    rt_size_t object_size;                              /**< object size                            */
};

rt_list_t 是个双链表指针

struct rt_list_node
{
    struct rt_list_node                 *next;          /* point to next node. */
    struct rt_list_node                 *prev;          /* point to prev node. */
};
typedef struct rt_list_node rt_list_t;                  /* Type for lists.     */

怎么在宏中出现了两个 &rt_object_container[c].object_list ？