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 18using std::experimental::optional; 19 20struct X 21{ 22 int i_; 23 24 constexpr X(int i) : i_(i) {} 25}; 26 27constexpr bool operator < ( const X &lhs, const X &rhs ) 28 { return lhs.i_ < rhs.i_ ; } 29 30#endif 31 32int 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