lst-0008-book.cpp
// https://godbolt.org/z/eq1dqWbe9
#include <iostream>
#include <string>
#include <tuple>
using std::tuple; using std::cout; using std::string;
int main() {
tuple<int,string> a { 12, "gnorf" };
tuple b { 666 };
tuple<double,double,string> c { 77.77, 33.33, "frong" };
tuple<int,string,int,double,double,string> r = std::tuple_cat( a, b, c );
cout << std::get<2>(r) << "\n"; // Output: 666
}