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Is posix namespace used?

The C ++ 11 Standard §17.6.4.2.2 defines posix as a reserved namespace for use by ISO / IEC 9945 and other POSIX standards, and states that C ++ programs that add declarations or definitions to the posix namespace have behavior undefined.

Is this namespace actually used by ISO / IEC 9945 or any other POSIX standards? If yes, please provide a link.

Notes:

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No.

At the time of writing, this is still a purely reserved namespace that is not actually used by anyone.

Recall that the vast majority of POSIX, if not all POSIX, is completely C ++ - they do not know.

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Source: https://habr.com/ru/post/1246304/

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