$Bitpacking

Back to local compiler directives.

The local compiler directive $BITPACKING:

• is used to compress records;
• knows the switches ON and OFF;
• tells the compiler whether it should use bitpacking or not when it encounters the Packed keyword for a structured type.

Example:

...
{$BITPACKING ON}
...
Type
   TMyRecord = packed record
     B1, B2, B3, B4 : Boolean;
   end;

Note: 1. The local compiler directive $BITPACKING is ignored in MacPas compiler mode. In the MacPas compiler mode, all packed records are aligned to bit addresses.
2. The reserved word Bitpacked can force alignment to bit addresses, regardless of the $BITPACKING directive and regardless of the $MODE.

See also

• Bit manipulation

From the Free Pascal wiki, page "$Bitpacking", as it stood on 2020-02-26 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.