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