Hello Rich,

On Tue, 10 Oct 2017 16:56:54 -0400 Rich Felker <dalias@libc.org> wrote:

> Also note that while standard functions in POSIX can additionally be
> defined as function-like macros, they can't be object-like macros, so
> (*read), etc. are safe due to the parentheses.

They would only be safe in the header. They are not safe on the using
side, I think. Something like

    toto->read = whatever;

or

    *toto = (cookie_io_functions_t){ .read = another, }

can't be protected by parenthesis.

Thanks
Jens

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