| //===----------------------------------------------------------------------===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| // <optional> |
| |
| // template <class T> constexpr bool operator<= (const optional<T>& x, const optional<T>& y); |
| |
| #include <optional> |
| |
| using std::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_ ; } |
| |
| int main() |
| { |
| { |
| typedef optional<X> 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), "" ); |
| } |
| } |