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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 ASIO_DISABLE_STD_ATOMIC, or explicitly
enabled for other compilers by defining ASIO_HAS_STD_ATOMIC.