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Update Boost headers (1.58.0)

#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SOLARIS_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SOLARIS_HPP_INCLUDED

//
//  boost/detail/atomic_count_solaris.hpp
//   based on: boost/detail/atomic_count_win32.hpp
//
//  Copyright (c) 2001-2005 Peter Dimov
//  Copyright (c) 2006 Michael van der Westhuizen
//
// 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 <atomic.h>

namespace boost
{

namespace detail
{

class atomic_count
{
public:

    explicit atomic_count( uint32_t v ): value_( v )
    {
    }

    long operator++()
    {
        return atomic_inc_32_nv( &value_ );
    }

    long operator--()
    {
        return atomic_dec_32_nv( &value_ );
    }

    operator uint32_t() const
    {
        return static_cast<uint32_t const volatile &>( value_ );
    }

private:

    atomic_count( atomic_count const & );
    atomic_count & operator=( atomic_count const & );

    uint32_t value_;
};

} // namespace detail

} // namespace boost

#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SOLARIS_HPP_INCLUDED