On 30 Jul 2009, at 10:09, Michael Schnell wrote:
This is not usable for accessing particular bits of microcontroller
registers, because the internal format of a bitpacked record is
undefined and can change at any time for any reason.
Is this likely to happen ?
That's irrelevant, unless you like writing programs of which it is
documented that they may break with any new compiler release.
AFAIK, in C the "struct ...:n" layout also is
implementation depending and the memory layout in fact is not
identical
between high-endian and low-endian processors.
This _does_ offer problems when transferring such structures via
Network
or files.
Even stronger: they are completely unsuited for that purpose. Just
like Pascal set types, for that matter (for exactly the same reason).
Jonas
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