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 // <optional> 11 12 // constexpr const T& optional<T>::operator*() const; 13 14 #ifdef _LIBCPP_DEBUG 15 #define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0)) 16 #endif 17 18 #include <experimental/optional> 19 #include <type_traits> 20 #include <cassert> 21 22 #if _LIBCPP_STD_VER > 11 23 24 using std::experimental::optional; 25 26 struct X 27 { 28 constexpr int test() const {return 3;} 29 }; 30 31 struct Y 32 { 33 int test() const {return 2;} 34 }; 35 36 #endif // _LIBCPP_STD_VER > 11 37 38 int main() 39 { 40 #if _LIBCPP_STD_VER > 11 41 { 42 constexpr optional<X> opt(X{}); 43 static_assert((*opt).test() == 3, ""); 44 } 45 { 46 constexpr optional<Y> opt(Y{}); 47 assert((*opt).test() == 2); 48 } 49 #ifdef _LIBCPP_DEBUG 50 { 51 const optional<X> opt; 52 assert((*opt).test() == 3); 53 assert(false); 54 } 55 #endif // _LIBCPP_DEBUG 56 #endif // _LIBCPP_STD_VER > 11 57 } 58
