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 12 // XFAIL: with_system_cxx_lib=macosx10.12 13 // XFAIL: with_system_cxx_lib=macosx10.11 14 // XFAIL: with_system_cxx_lib=macosx10.10 15 // XFAIL: with_system_cxx_lib=macosx10.9 16 // XFAIL: with_system_cxx_lib=macosx10.7 17 // XFAIL: with_system_cxx_lib=macosx10.8 18 19 // <optional> 20 21 // constexpr T& optional<T>::value() &; 22 23 #include <optional> 24 #include <type_traits> 25 #include <cassert> 26 27 #include "test_macros.h" 28 29 using std::optional; 30 using std::bad_optional_access; 31 32 struct X 33 { 34 X() = default; 35 X(const X&) = delete; 36 constexpr int test() const & {return 3;} 37 int test() & {return 4;} 38 constexpr int test() const && {return 5;} 39 int test() && {return 6;} 40 }; 41 42 struct Y 43 { 44 constexpr int test() & {return 7;} 45 }; 46 47 constexpr int 48 test() 49 { 50 optional<Y> opt{Y{}}; 51 return opt.value().test(); 52 } 53 54 55 int main() 56 { 57 { 58 optional<X> opt; ((void)opt); 59 ASSERT_NOT_NOEXCEPT(opt.value()); 60 ASSERT_SAME_TYPE(decltype(opt.value()), X&); 61 } 62 { 63 optional<X> opt; 64 opt.emplace(); 65 assert(opt.value().test() == 4); 66 } 67 #ifndef TEST_HAS_NO_EXCEPTIONS 68 { 69 optional<X> opt; 70 try 71 { 72 (void)opt.value(); 73 assert(false); 74 } 75 catch (const bad_optional_access&) 76 { 77 } 78 } 79 #endif 80 static_assert(test() == 7, ""); 81 } 82
