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