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 // constexpr explicit optional<T>::operator bool() const noexcept;
13 
14 #include <experimental/optional>
15 #include <type_traits>
16 #include <cassert>
17 
main()18 int main()
19 {
20 #if _LIBCPP_STD_VER > 11
21     using std::experimental::optional;
22 
23     {
24         constexpr optional<int> opt;
25         static_assert(!opt, "");
26     }
27     {
28         constexpr optional<int> opt(0);
29         static_assert(opt, "");
30     }
31 #endif  // _LIBCPP_STD_VER > 11
32 }
33