utility
pair
包含两个元素的容器
cpp
#include <iostream>
#include <utility>
int main() {
std::pair<int, int> p = {10, 20};
std::cout << p.first << " " << p.second << std::endl;
// 10 20
return 0;
}swap
交换两个对象的值
cpp
#include <iostream>
#include <utility>
int main() {
int a = 5;
int b = 10;
std::swap(a, b);
std::cout << " a = " << a << std::endl;
std::cout << " b = " << b << std::endl;
// a = 10
// b = 5
return 0;
}