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# Standard library header <ciso646>

From cppreference.com
< cpp‎ | header

This header was originally in the C standard library as `<iso646.h>`.

Compatibility header, in C defines alternative operator representations which are keywords in C++.

This means that in a conforming implementation this header is empty.

It may still be required in order to have the alternative operator representations in old or non-conformant compilers.

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