Hi,
On 8/27/21 8:11 PM, David Sletten wrote:
Hi,
I've run across what I believe is a minor error in the man page for C
operators (https://man7.org/linux/man-pages/man7/operator.7.html ).
The man page lists casting in the 2nd row of the table:
Operator Associativity Notes
() [] -> . ++ -- left to right [1]
! ~ ++ -- + - (type) * & sizeof right to left [2]
* / % left to right
However, in "C A Reference Manual" (5th ed.), table 7-3 on pg. 205 shows
that all of the operators in row 2 above have a precedence of 15 except
for casts which have a precedence of 14. Consequently, the man page
should display casts as the (new) 3rd row in the table above.
Thanks for your effort in maintaining this documentation.
Reviewing the standard (C18), "C A Reference Manual" seems to be right.
Unary operators are mentioned in C18::6.5.3, and casts are in
C18::6.5.4 (they are mentioned in order of precedence).
I also noticed that we're missing compound literals in the first row.
And we're also missing _Alignof() in the second row.
However, since all of those use parentheses (and braces),
there's no doubt in their precedence, so I'll ignore them for now.
And for some reason they are in a different order from the one in the
standard, which makes it a bit difficult to correlate what is in the
manual page and what is in the standard, so I think reordering them
inside the rows will also be an improvement.
Thanks,
Alex
--
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/
