1 // PR c++/78358 2 // { dg-do run } 3 // { dg-options -std=c++17 } 4 5 #include <tuple> 6 7 template <typename, typename> struct same_type; 8 template <typename T> struct same_type<T, T> {}; 9 10 int main() { 11 std::tuple tuple = { 1, 'a', 2.3, true }; 12 auto[i, c, d, b] = tuple; 13 same_type<std::tuple_element<0, decltype(tuple)>::type, decltype(i)>{}; 14 same_type<decltype(i), int>{}; 15 same_type<decltype(c), char>{}; 16 same_type<decltype(d), double>{}; 17 same_type<decltype(b), bool>{}; 18 if (i != 1 || c != 'a' || d != 2.3 || b != true) 19 __builtin_abort (); 20 } 21