关于void (visit)(const ElemType &)的理解[通俗易懂]

template <class ElemType>
SeqList<ElemType>::SeqList(ElemType v[], int n, int size)    //构造函数
{
 elems = new ElemType[size];    
 assert(elems);                   
 maxLength = size;   
 length = n;     
 for (int i = 0; i < length; i++) 
  elems[i] = v[i]; 
}
 template <class ElemType>
SeqList<ElemType>::void traverse(void (*visit)(const T &))const
{
    for(int i=0;i<length;i++)
    {
        (*visit)(elems[i]);
    }
}
template <class ElemType>
void Write(const ElemType &e)
{
    cout << e << "  ";
}

    int a[]={1,2,3};
    SeqList<int> la(a,3,5);
    la.Traverse(Write);