我学hash_map(2)

#include <iostream>
#include <unordered_map>
using namespace std;

struct node
{
    int a;

    bool operator==(const node & n) const
    {
        return a == n.a;
    }
};

struct Hash
{
    size_t operator()(const node & n) const
    {
        return n.a;
    }
};


int main()
{
    unordered_map<node, int, Hash> ss;
    
    for(int i=0;i<10;i++)
    {
        node tmp;
        tmp.a = i;
        ss[tmp] = i * i;
    }
    for(unordered_map<node,int, Hash>::iterator iter = ss.begin();iter != ss.end();iter++)
    {
        cout << (iter->first).a << "\t" << iter->second << endl;
    }    

}