c 2b 2b std 3a 3apair

1// make_pair example
2#include <utility>      // std::pair
3#include <iostream>     // std::cout
4
5int main () {
6  std::pair <int,int> foo;
7  std::pair <int,int> bar;
8
9  foo = std::make_pair (10,20);
10  bar = std::make_pair (10.5,'A'); // ok: implicit conversion from pair<double,char>
11
12  std::cout << "foo: " << foo.first << ", " << foo.second << '\n';
13  std::cout << "bar: " << bar.first << ", " << bar.second << '\n';
14
15  return 0;
16}

1// pair::pair example
2#include <utility>      // std::pair, std::make_pair
3#include <string>       // std::string
4#include <iostream>     // std::cout
5
6int main () {
7  std::pair <std::string,double> product1;                     // default constructor
8  std::pair <std::string,double> product2 ("tomatoes",2.30);   // value init
9  std::pair <std::string,double> product3 (product2);          // copy constructor
10
11  product1 = std::make_pair(std::string("lightbulbs"),0.99);   // using make_pair (move)
12  return 0;
13}