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 // XFAIL: libcpp-no-exceptions 11 // <optional> 12 13 // T& optional<T>::value(); 14 15 #include <experimental/optional> 16 #include <type_traits> 17 #include <cassert> 18 19 #if _LIBCPP_STD_VER > 11 20 21 using std::experimental::optional; 22 using std::experimental::bad_optional_access; 23 24 struct X 25 { 26 X() = default; 27 X(const X&) = delete; 28 constexpr int test() const {return 3;} 29 int test() {return 4;} 30 }; 31 32 #endif // _LIBCPP_STD_VER > 11 33 34 int main() 35 { 36 #if _LIBCPP_STD_VER > 11 37 { 38 optional<X> opt; 39 opt.emplace(); 40 assert(opt.value().test() == 4); 41 } 42 { 43 optional<X> opt; 44 try 45 { 46 opt.value(); 47 assert(false); 48 } 49 catch (const bad_optional_access&) 50 { 51 } 52 } 53 #endif // _LIBCPP_STD_VER > 11 54 } 55
