tuple<int, int, string> t, t1, t2;

t = make_tuple(1, 2, "qwe");

t1 = make_tuple(3, 2, "qwe");

t2 = make_tuple(3, 2, "qwe");

int a = get<0>(t);

get<0>(t) = get<1>(t); // 可以修改

cout << a << endl;

cout << (get<0>(t) > get<1>(t) ? "true" : "false") << endl; // 比较大小

cout << (t1 == t2 ? "true" : "false") << endl;

typedef tuple<int, int, int, string> T;

cout << tuple_size<T>::value << endl; // meta programming 处理类型

cout << tuple_size<T>::value << endl;

tuple_element<1, T>::type a1 = 10;

cout << a1 << endl;

return 0;

}