多重嵌套

struct Node1
{
int data1;
int data2;
};

struct Node
{
int key;
map<int,Node1> myMap1;
};


//map中有Node,Node中有myMap1,myMap1中有Node1,则要想myMap中插入元素,必须由里到外赋值或插入
int main()
{
//向myMap中插入元素
map<int,Node> myMap;
map<int, Node>::iterator it;
map<int, Node1>::iterator it1;

int p1 = 4,p=5;
Node1 N1 = {1,2};

Node N;
N.key = 3;
N.myMap1.insert(pair<int, Node1>(p1, N1));

myMap.insert(pair<int, Node>(p, N));

//遍历myMap
for (it = myMap.begin(); it != myMap.end(); it++)
{
printf("%d\n",it->first);
printf("%d\n", it->second.key);
for (it1 = it->second.myMap1.begin(); it1 != it->second.myMap1.end(); it1++)
{
printf("%d\n", it1->first);
printf("%d\n", it1->second.data1);
printf("%d\n", it1->second.data2);
}
}

return 0;
}

打印:

5
3
4
1
2

这也是一种机智的面向过程的保存数据的方法,这里非要用2个迭代器才能遍历全部数据。