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 // inline constexpr nullopt_t nullopt(unspecified); 15 16 // [optional.nullopt]/2: 17 // Type nullopt_t shall not have a default constructor or an initializer-list 18 // constructor, and shall not be an aggregate. 19 20 #include <optional> 21 22 int main() 23 { 24 std::nullopt_t n = {}; 25 } 26
