1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 // <optional> 12 13 // struct nullopt_t{see below}; 14 15 #include <optional> 16 17 using std::optional; 18 using std::nullopt_t; 19 20 int main() 21 { 22 // I roughly interpret LWG2736 as "it shall not be possible to copy-list-initialize nullopt_t with an 23 // empty braced-init-list." 24 nullopt_t foo = {}; 25 } 26
