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The macro was used to highlight the (op)_and_test methods of atomic<> that changed the returned value to the opposite in Boost 1.67. The old behavior was only released in 1.66 and the macro was a means to help 1.66 users to transition to the new releases. 1.67 will have been released 2 years before the upcoming 1.73 release, in which this macro will be removed.