Memory layout of a data structure: Difference between revisions

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==[[Ada]]==

=={{header|Ada}}==

[[Category:Ada]]

type Bit is mod 2;

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end record;

==[[C]]/[[C++]]==

=={{header|C}}/{{header|C++}}==

[[Category:C]]

[[Category:C++]]

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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.

==[[Forth]]==

=={{header|Forth}}==

[[Category:Forth]]

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.

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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.

==[[Perl]]==

=={{header|Perl}}==

[[Category:Perl]]

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

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