关于*(void**)的问题

看到别人写的一个类. 具体代码如下
ArrayObjectPool.h

#ifndef _COMMON_ARRAY_OBJECT_POOL_H_#define _COMMON_ARRAY_OBJECT_POOL_H_#include <stdint.h>namespace easynet{class ArrayObjectPool{public:    /** 构造函数     * @param elem_size : 元素大小(字节).小于4字节将被调整为4;     * @param elem_num  : 元素个数     */    ArrayObjectPool(uint32_t elem_size, uint32_t elem_num);    ~ArrayObjectPool();    uint32_t ElemSize(){return m_ElemSize;}    uint32_t Capacity(){return m_ElemNum;}    bool IsEmpty(){return m_FreeHead==NULL;}    /** 获取元素     * @return : 返回元素指针,无空闲元素可用返回NULL;     */    void* Get();    /** 回收元素     * @param elem : 待回收的元素     * @return     : true成功;false失败,elem非本对象元素;     */    bool Recycle(void *elem);private:    void *m_Elements;    void *m_End;    void *m_FreeHead;    uint32_t m_ElemSize;    uint32_t m_ElemNum;};}#endif //_COMMON_ARRAY_OBJECT_POOL_H_

cpp文件

/* * ArrayObjectPool.cpp * *  Created on: Apr 18, 2013 *      Author: LiuYongJin */#include <assert.h>#include <stddef.h>#include <stdlib.h>#include "ArrayObjectPool.h"namespace easynet{ArrayObjectPool::ArrayObjectPool(uint32_t elem_size, uint32_t elem_num){    m_ElemNum = elem_num;    if(elem_size < sizeof(void*))        m_ElemSize = sizeof(void*);    else        m_ElemSize = elem_size;    m_Elements = malloc(m_ElemSize*m_ElemNum);    m_End = (void*)((char*)m_Elements+m_ElemSize*m_ElemNum);    assert(m_Elements != NULL);    //构建链表    int i;    void *node = m_Elements;    for(i=0; i<m_ElemNum-1; ++i)    {        *(void**)node = (void*)((char*)node+m_ElemSize);        node = *(void**)node;    }    *(void**)node = NULL;    m_FreeHead = m_Elements;    //链表头}ArrayObjectPool::~ArrayObjectPool(){    free(m_Elements);}void* ArrayObjectPool::Get(){    if(m_FreeHead == NULL)        return NULL;    void *temp = m_FreeHead;    m_FreeHead = *(void**)m_FreeHead;    return temp;}bool ArrayObjectPool::Recycle(void *elem){    if(elem<m_Elements || elem>=m_End)        return false;    *(void**)elem = m_FreeHead;    m_FreeHead = elem;    return true;}}

我的迷惑是不太明白

for(i=0; i<m_ElemNum-1; ++i){    *(void**)node = (void*)((char*)node+m_ElemSize);    node = *(void**)node;}

这段的意义是什么, 另外*(void**)的赋值的作用? 谢谢