cpp-tuple

#include <tuple>
#include <functional>

std::tuple<int, int> f() 
{
    int x = 5;
    return std::make_tuple(x, 7); // return {x,7}; 于 C++17
}

int ()
{
    // 异类 tuple 构造
    int n = 1;
    auto t = std::make_tuple(10, "Test", 3.14, std::ref(n), n);
    n = 7;
    std::cout << "The value of t is "  << "("
              << std::get<0>(t) << ", " << std::get<1>(t) << ", "
              << std::get<2>(t) << ", " << std::get<3>(t) << ", "
              << std::get<4>(t) << ")n";

    // 返回多值的函数
    int a, b;
    std::tie(a, b) = f();
    std::cout << a << " " << b << "n";
}