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operator.7: Fix precedence of the 'cast operator' 

Unary operators are mentioned in C11::6.5.3, and casts are in
C11::6.5.4 (they are mentioned in order of precedence).

And from note 85 (in section 6.5) in that same C11 standard, major
subsections 6.5.X are sorted by precedence.

As an example (from Jakub), `sizeof(int)+1` is interpreted as
`(sizeof(int))+1`, and not `sizeof((int)+1)`.

I used C11 and not C18 (the latest) because at least in the draft
copy of C18 that I have, there are a few important typos in that
section, while the draft copy of C11 that I have is free of those
typos.  And C11 and C18 are almost identical, with no major
changes to the language.

Reported-by: David Sletten <david.paul.sletten@gmail.com>
Cc: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Alejandro Colomar 2021-08-28 14:11:06 +02:00 committed by Michael Kerrisk
parent 15af0ac10a
commit 9c9a5acaa2
1 changed files with 2 additions and 1 deletions
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@ -48,7 +48,8 @@ lb lb lb
l l l.
Operator Associativity Notes
() [] \-> . ++ \-\- left to right [1]
! \(ti ++ \-\- + \- (type) * & sizeof right to left [2]
! \(ti ++ \-\- + \- * & sizeof right to left [2]
(type) right to left
* / % left to right
+ \- left to right
<< >> left to right