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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

/*
 (c) 2014 Glen Joseph Fernandes
 glenjofe at gmail dot com

 Distributed under the Boost Software
 License, Version 1.0.
 http://boost.org/LICENSE_1_0.txt
*/
#ifndef BOOST_ALIGN_DETAIL_IS_ALIGNMENT_CONSTANT_HPP
#define BOOST_ALIGN_DETAIL_IS_ALIGNMENT_CONSTANT_HPP

#include <boost/align/detail/integral_constant.hpp>
#include <cstddef>

namespace boost {
    namespace alignment {
        namespace detail {
            template<std::size_t N>
            struct is_alignment_constant
                : integral_constant<bool,
                    (N > 0) && ((N & (N - 1)) == 0)> {
            };
        }
    }
}

#endif