Memory layout of a data structure: Difference between revisions

25 -

 

[[Category:Ada]]

type Bit is mod 2;

end record;

 

[[Category:C]]

[[Category:C++]]

The ":1" gives the number of allocated bits. For unused bits (e.g. pin 11 in the 25-pin version above) the field name can be omitted.

 

Low level hardware control is a typical use of Forth. None of this is standard, however, since hardware I/O mechanisms differ on different systems. Forth does not have a structure mechanism, much less bitfields. These would be represented instead via bitmask constants if doing real serial port control.

 

Of course, this is a very simplified view of the full RS-232 protocol. Also, although this represents the order of the pins in a D-9 connector, this would not necessarily be the same as the order of the bits in a control register.

 

use Bit::Vector::Minimal qw();

my $vec = Bit::Vector::Minimal->new(size => 24);