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              header

              <ciso646> (iso646.h)

              ISO 646 Alternative operator spellings
              This header defines eleven macro constants with alternative spellings for those C++ operators not supported by the ISO646 standard character set:

              macrooperator
              and&&
              and_eq&=
              bitand&
              bitor|
              compl~
              not!
              not_eq!=
              or||
              or_eq|=
              xor^
              xor_eq^=

              In C++, reserved words exist with the same names as these macros and are treated as aliases of their respective operator. Therefore the inclusion of this header has no effect in C++, and is not necessary in order to use the alternative names.
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