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 11 // <optional> 12 13 // constexpr const T& optional<T>::value() const; 14 15 #include <experimental/optional> 16 #include <type_traits> 17 #include <cassert> 18 19 #include "test_macros.h" 20 21 using std::experimental::optional; 22 using std::experimental::in_place_t; 23 using std::experimental::in_place; 24 using std::experimental::bad_optional_access; 25 26 struct X 27 { 28 X() = default; 29 X(const X&) = delete; 30 constexpr int test() const {return 3;} 31 int test() {return 4;} 32 }; 33 34 int main() 35 { 36 { 37 constexpr optional<X> opt(in_place); 38 static_assert(opt.value().test() == 3, ""); 39 } 40 { 41 const optional<X> opt(in_place); 42 assert(opt.value().test() == 3); 43 } 44 #ifndef TEST_HAS_NO_EXCEPTIONS 45 { 46 const optional<X> opt; 47 try 48 { 49 opt.value(); 50 assert(false); 51 } 52 catch (const bad_optional_access&) 53 { 54 } 55 } 56 #endif 57 } 58
