This macro returns true if x is a power of 2, and false
otherwise.
0 is considered a power of 2. This can make sense considering
wrapping of unsigned integers, and has interesting properties.
ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ
True or false, if x is a power of 2 or not, respectively.
СТАНДАРТЫ
BSD.
ЗАМЕЧАНИЯ
The arguments may be evaluated more than once.
Because this macro is implemented using bitwise operations, some
negative values can invoke undefined behavior. For example, the
following invokes undefined behavior: powerof2(INT_MIN);. Call
it only with unsigned types to be safe.
СМОТРИТЕ ТАКЖЕ
stdc_bit_ceil(3), stdc_bit_floor(3)
КОЛОФОН
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 powerof2(3)
