1// (C) Copyright John Maddock 2018 2 3// Use, modification and distribution are subject to the 4// Boost Software License, Version 1.0. (See accompanying file 5// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 7// See http://www.boost.org/libs/config for more information. 8 9// MACRO: BOOST_NO_CXX17_HDR_OPTIONAL 10// TITLE: C++17 header <optional> unavailable 11// DESCRIPTION: The standard library does not supply C++17 header <optional> 12 13#include <optional> 14 15namespace boost_no_cxx17_hdr_optional { 16 17int test() 18{ 19 using std::optional; 20 return 0; 21} 22 23} 24