//          Copyright Kohei Takahashi 2016.
// Distributed under 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)

#include <boost/config.hpp>

#ifdef BOOST_NO_CXX11_HDR_MUTEX
#error "C++11 <mutex> is not available."
#endif