use_pair

以你之姓@ 2022-06-08 13:44 243阅读 0赞

//pair常见的使用方式
    #include<iostream>
    #include <utility>
    #include <string>
    #include <tuple>
    
    using namespace std;
    
    
    int main(){
        pair<string,double> product1;
        pair<string,double> product2("tomatoes",2.30);;
        pair<string,double> product3(product2);
        product1 = make_pair(string("lightbulbs"),0.99);
        product2.first = "Shoes";
        product2.second = 39.09;
        cout << product1.first << " " << product1.second << endl;
        cout << product2.first << " " << product2.second << endl;
        cout << product3.first << " " << product3.second << endl;
        pair<string,int> planet,homeplanet;
        planet = make_pair("Earth",6371);
    
        homeplanet = planet;
    
        cout << "Home Planet: " << homeplanet.first << endl;
        cout << "Planet size: " << homeplanet.second << endl;
        planet.swap(homeplanet);
        cout << "Planet Planet: " << planet.first << endl;
        cout << "Planet size: " << planet.second << endl;
    
        pair<int,char> foo(10,'x');
        get<0>(foo) = 50;
    
        cout << "foo contains ";
        cout << get<0>(foo) << " and " << get<1>(foo) << endl;
        tuple<int,char> mytuple(10,'a');
        get<0>(mytuple) = 20;
        cout << "mytuple contains: ";
        cout << get<0>(mytuple) << " and " << get<1>(mytuple) << endl;
        cout << endl;
        return 0;
    }

use_pair

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