C++ 结构体初始化

　　结构体是C++常用的数据结构，其初始化可以如下：

#include<bits/stdc++.h>
using namespace std;

struct Node{
    int M, V;
    Node(int a, int b){
        M = a;
        V = b;
    }

};

int main(){
    Node n1(1, 65), n2(5, 23), n3(2, 99);
    cout << n1.M << ' ' << n1.V << endl;
    cout << n2.M << ' ' << n2.V << endl;
    cout << n3.M << ' ' << n3.V << endl;
    
} 

 　　此外，结构体还可以重载操作符，如：

#include<bits/stdc++.h>
using namespace std;

struct Node{
    int M, V;
    Node(int a, int b){
        M = a;
        V = b;
    }
    friend bool operator < (const Node n1, const Node n2){
        return n1.V < n2.V;
    }
    friend bool operator > (const Node n1, const Node n2){
        return n1.V > n2.V;
    }
    friend ostream &operator << (ostream &os, const Node n){
        os << n.M << ' ' << n.V;
        return os;
    }
};

int main(){
    Node n1(1, 65), n2(5, 23), n3(2, 99);
    
    if(n1 < n2) cout << n1 << endl;
    else cout << n2 << endl;
} 

 　　自然，结构体也可以配合STL一起使用，如配合优先队列使用，注意在只用有优先队列是必须重载小于号，只重载大于号是不可以的：

#include<bits/stdc++.h>
using namespace std;

struct Node{
    int M, V;
    Node(int a, int b){
        M = a;
        V = b;
    }
    friend bool operator < (const Node n1, const Node n2){
        return n1.V < n2.V;
    }
    friend bool operator > (const Node n1, const Node n2){
        return n1.V > n2.V;
    }
    friend ostream &operator << (ostream &os, const Node n){
        os << n.M << ' ' << n.V;
        return os;
    }
};

int main(){
    Node n1(1, 65), n2(5, 23), n3(2, 99);
    
    priority_queue<Node> pq;
    pq.push(n1), pq.push(n2), pq.push(n3);
    
    while(!pq.empty()){
        Node n = pq.top();
        pq.pop();
        cout << n << endl;
    }
}