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          Boost.Asio's implementation can use std::atomic<> in
          preference to boost::detail::atomic_count.
        
          Support for the standard atomic integer template is automatically enabled
          for g++ 4.5 and later, when the -std=c++0x
          or -std=gnu++0x compiler options are used. It may be
          disabled by defining BOOST_ASIO_DISABLE_STD_ATOMIC, or explicitly
          enabled for other compilers by defining BOOST_ASIO_HAS_STD_ATOMIC.