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 // A program that necessitates the instantiation of template optional for 14 // (possibly cv-qualified) nullopt_t is ill-formed. 15 16 #include <optional> 17 18 int main() 19 { 20 using std::optional; 21 using std::nullopt_t; 22 using std::nullopt; 23 24 optional<nullopt_t> opt; // expected-note 1 {{requested here}} 25 optional<const nullopt_t> opt1; // expected-note 1 {{requested here}} 26 optional<nullopt_t &> opt2; // expected-note 1 {{requested here}} 27 optional<nullopt_t &&> opt3; // expected-note 1 {{requested here}} 28 // expected-error@optional:* 4 {{instantiation of optional with nullopt_t is ill-formed}} 29 } 30
