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 // constexpr const T& optional<T>::value() const &; 14 15 #include <optional> 16 #include <type_traits> 17 #include <cassert> 18 19 using std::optional; 20 21 struct X 22 { 23 constexpr int test() const {return 3;} 24 int test() {return 4;} 25 }; 26 27 int main() 28 { 29 { 30 constexpr optional<X> opt; 31 static_assert(opt.value().test() == 3, ""); 32 } 33 } 34
