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: availability=macosx10.13 13 // XFAIL: availability=macosx10.12 14 // XFAIL: availability=macosx10.11 15 // XFAIL: availability=macosx10.10 16 // XFAIL: availability=macosx10.9 17 // XFAIL: availability=macosx10.8 18 // XFAIL: availability=macosx10.7 19 20 // <optional> 21 22 // constexpr T& optional<T>::value() &; 23 24 #include <optional> 25 #include <type_traits> 26 #include <cassert> 27 28 #include "test_macros.h" 29 30 using std::optional; 31 using std::bad_optional_access; 32 33 struct X 34 { 35 X() = default; 36 X(const X&) = delete; 37 constexpr int test() const & {return 3;} 38 int test() & {return 4;} 39 constexpr int test() const && {return 5;} 40 int test() && {return 6;} 41 }; 42 43 struct Y 44 { 45 constexpr int test() & {return 7;} 46 }; 47 48 constexpr int 49 test() 50 { 51 optional<Y> opt{Y{}}; 52 return opt.value().test(); 53 } 54 55 56 int main() 57 { 58 { 59 optional<X> opt; ((void)opt); 60 ASSERT_NOT_NOEXCEPT(opt.value()); 61 ASSERT_SAME_TYPE(decltype(opt.value()), X&); 62 } 63 { 64 optional<X> opt; 65 opt.emplace(); 66 assert(opt.value().test() == 4); 67 } 68 #ifndef TEST_HAS_NO_EXCEPTIONS 69 { 70 optional<X> opt; 71 try 72 { 73 (void)opt.value(); 74 assert(false); 75 } 76 catch (const bad_optional_access&) 77 { 78 } 79 } 80 #endif 81 static_assert(test() == 7, ""); 82 } 83
