config/test/boost_no_cxx17_hdr_optional.ipp

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// (C) Copyright John Maddock 2018
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/config for more information.
// MACRO: BOOST_NO_CXX17_HDR_OPTIONAL
// TITLE: C++17 header <optional> unavailable
// DESCRIPTION: The standard library does not supply C++17 header <optional>
#include <optional>
namespace boost_no_cxx17_hdr_optional {
int test()
{
using std::optional;
return 0;
}
}