//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <optional> // template <class T> constexpr bool operator==(const optional<T>& x, const optional<T>& y); #include <experimental/optional> #include <type_traits> #include <cassert> #if _LIBCPP_STD_VER > 11 using std::experimental::optional; struct X { int i_; constexpr X(int i) : i_(i) {} }; constexpr bool operator == ( const X &lhs, const X &rhs ) { return lhs.i_ == rhs.i_ ; } #endif int main() { #if _LIBCPP_STD_VER > 11 { typedef X T; typedef optional<T> O; constexpr O o1; // disengaged constexpr O o2; // disengaged constexpr O o3{1}; // engaged constexpr O o4{2}; // engaged constexpr O o5{1}; // engaged static_assert ( o1 == o1 , "" ); static_assert ( o1 == o2 , "" ); static_assert ( !(o1 == o3), "" ); static_assert ( !(o1 == o4), "" ); static_assert ( !(o1 == o5), "" ); static_assert ( o2 == o1 , "" ); static_assert ( o2 == o2 , "" ); static_assert ( !(o2 == o3), "" ); static_assert ( !(o2 == o4), "" ); static_assert ( !(o2 == o5), "" ); static_assert ( !(o3 == o1), "" ); static_assert ( !(o3 == o2), "" ); static_assert ( o3 == o3 , "" ); static_assert ( !(o3 == o4), "" ); static_assert ( o3 == o5 , "" ); static_assert ( !(o4 == o1), "" ); static_assert ( !(o4 == o2), "" ); static_assert ( !(o4 == o3), "" ); static_assert ( o4 == o4 , "" ); static_assert ( !(o4 == o5), "" ); static_assert ( !(o5 == o1), "" ); static_assert ( !(o5 == o2), "" ); static_assert ( o5 == o3 , "" ); static_assert ( !(o5 == o4), "" ); static_assert ( o5 == o5 , "" ); } #endif }