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