The config/config.hpp
      header defines internal configuration macros as well as a macro
      for determining whether the compiler's preprocessor conforms to
      the standard. The file is automatically included whenever any
      Boost PP macros are used.The end-user can manually include it
      in order to use the BOOST_PP_IS_STANDARD macro, but normally
      should never have to do so.
     Usage 
     #include <boost/preprocessor/config/config.hpp>
    
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    © Copyright Edward Diener
        2011,2014,2020