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//===----------------------------------------------------------------------===//
//
// 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>
// struct in_place_t{};
// constexpr in_place_t in_place{};
#include <experimental/optional>
#include <type_traits>
#if _LIBCPP_STD_VER > 11
using std::experimental::optional;
using std::experimental::in_place_t;
using std::experimental::in_place;
constexpr
int
test(const in_place_t&)
{
return 3;
}
#endif
int main()
{
#if _LIBCPP_STD_VER > 11
static_assert((std::is_class<in_place_t>::value), "");
static_assert((std::is_empty<in_place_t>::value), "");
static_assert(test(in_place) == 3, "");
#endif
}
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