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 // T& optional<T>::operator*(); 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 { testX27 constexpr int test() const {return 3;} testX28 int test() {return 4;} 29 }; 30 main()31int main() 32 { 33 { 34 optional<X> opt(X{}); 35 assert((*opt).test() == 4); 36 } 37 #ifdef _LIBCPP_DEBUG 38 { 39 optional<X> opt; 40 assert((*opt).test() == 3); 41 assert(false); 42 } 43 #endif // _LIBCPP_DEBUG 44 } 45