less_than.pass.cpp revision 3f433cdb8ea0a93d7dff4818f920ae74fe012d3f
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 <optional> 15 16#if _LIBCPP_STD_VER > 11 17 18struct X 19{ 20 int i_; 21 22 constexpr X(int i) : i_(i) {} 23}; 24 25constexpr bool operator < ( const X &lhs, const X &rhs ) 26 { return lhs.i_ < rhs.i_ ; } 27 28#endif 29 30int main() 31{ 32#if _LIBCPP_STD_VER > 11 33 { 34 typedef std::optional<X> O; 35 36 constexpr O o1; // disengaged 37 constexpr O o2; // disengaged 38 constexpr O o3{1}; // engaged 39 constexpr O o4{2}; // engaged 40 constexpr O o5{1}; // engaged 41 42 static_assert ( !(o1 < o1), "" ); 43 static_assert ( !(o1 < o2), "" ); 44 static_assert ( o1 < o3 , "" ); 45 static_assert ( o1 < o4 , "" ); 46 static_assert ( o1 < o5 , "" ); 47 48 static_assert ( !(o2 < o1), "" ); 49 static_assert ( !(o2 < o2), "" ); 50 static_assert ( o2 < o3 , "" ); 51 static_assert ( o2 < o4 , "" ); 52 static_assert ( o2 < o5 , "" ); 53 54 static_assert ( !(o3 < o1), "" ); 55 static_assert ( !(o3 < o2), "" ); 56 static_assert ( !(o3 < o3), "" ); 57 static_assert ( o3 < o4 , "" ); 58 static_assert ( !(o3 < o5), "" ); 59 60 static_assert ( !(o4 < o1), "" ); 61 static_assert ( !(o4 < o2), "" ); 62 static_assert ( !(o4 < o3), "" ); 63 static_assert ( !(o4 < o4), "" ); 64 static_assert ( !(o4 < o5), "" ); 65 66 static_assert ( !(o5 < o1), "" ); 67 static_assert ( !(o5 < o2), "" ); 68 static_assert ( !(o5 < o3), "" ); 69 static_assert ( o5 < o4 , "" ); 70 static_assert ( !(o5 < o5), "" ); 71 } 72#endif 73} 74