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 // template <class T> constexpr bool operator==(const optional<T>& x, const optional<T>& y); 13 14 #include <experimental/optional> 15 #include <type_traits> 16 #include <cassert> 17 18 #if _LIBCPP_STD_VER > 11 19 20 using std::experimental::optional; 21 22 struct X 23 { 24 int i_; 25 26 constexpr X(int i) : i_(i) {} 27 }; 28 29 constexpr bool operator == ( const X &lhs, const X &rhs ) 30 { return lhs.i_ == rhs.i_ ; } 31 32 #endif 33 34 int main() 35 { 36 #if _LIBCPP_STD_VER > 11 37 { 38 typedef X T; 39 typedef optional<T> O; 40 41 constexpr O o1; // disengaged 42 constexpr O o2; // disengaged 43 constexpr O o3{1}; // engaged 44 constexpr O o4{2}; // engaged 45 constexpr O o5{1}; // engaged 46 47 static_assert ( o1 == o1 , "" ); 48 static_assert ( o1 == o2 , "" ); 49 static_assert ( !(o1 == o3), "" ); 50 static_assert ( !(o1 == o4), "" ); 51 static_assert ( !(o1 == o5), "" ); 52 53 static_assert ( o2 == o1 , "" ); 54 static_assert ( o2 == o2 , "" ); 55 static_assert ( !(o2 == o3), "" ); 56 static_assert ( !(o2 == o4), "" ); 57 static_assert ( !(o2 == o5), "" ); 58 59 static_assert ( !(o3 == o1), "" ); 60 static_assert ( !(o3 == o2), "" ); 61 static_assert ( o3 == o3 , "" ); 62 static_assert ( !(o3 == o4), "" ); 63 static_assert ( o3 == o5 , "" ); 64 65 static_assert ( !(o4 == o1), "" ); 66 static_assert ( !(o4 == o2), "" ); 67 static_assert ( !(o4 == o3), "" ); 68 static_assert ( o4 == o4 , "" ); 69 static_assert ( !(o4 == o5), "" ); 70 71 static_assert ( !(o5 == o1), "" ); 72 static_assert ( !(o5 == o2), "" ); 73 static_assert ( o5 == o3 , "" ); 74 static_assert ( !(o5 == o4), "" ); 75 static_assert ( o5 == o5 , "" ); 76 77 } 78 #endif 79 } 80
