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, nullopt_t) noexcept; 14// template <class T> constexpr bool operator>(nullopt_t, const optional<T>& x) noexcept; 15 16#include <experimental/optional> 17 18int main() 19{ 20 using std::experimental::optional; 21 using std::experimental::nullopt_t; 22 using std::experimental::nullopt; 23 24 { 25 typedef int T; 26 typedef optional<T> O; 27 28 constexpr O o1; // disengaged 29 constexpr O o2{1}; // engaged 30 31 static_assert ( !(nullopt > o1), "" ); 32 static_assert ( !(nullopt > o2), "" ); 33 static_assert ( !(o1 > nullopt), "" ); 34 static_assert ( (o2 > nullopt), "" ); 35 36 static_assert (noexcept(nullopt > o1), ""); 37 static_assert (noexcept(o1 > nullopt), ""); 38 } 39} 40