It is not possible to extend an enumeration type. If you are not willing to use separate sets to hold common and extended elements, you can use a generic (not parametric) set type, say SET OF 0..31, that can hold all possible elements, and define the possible elements as constants.
On Fri, Dec 28, 2012 at 6:42 PM, Mark Morgan Lloyd <markmll.fpc-pas...@telemetry.co.uk> wrote: > Is it possible to extend an enumeration, while preserving strong type > checking? In other words, given existing code like > > type TUpstreamServerCapabilitiesBase= (uscConnected, uscCanIssueGUID); > TLocalServerCapabilitiesBase= (lscConnected, lscCanIssueGUID, > lscIsFirebird); > > TUpstreamServerCapabilities= set of TUpstreamServerCapabilitiesBase; > TLocalServerCapabilities= set of TLocalServerCapabilitiesBase; > > can the common parts of those enumerations- whether a connection was > initially established and so on- be moved into a common declaration, > preferably using "classical" Pascal so that I can store capabilities as a > set? > > -- > Mark Morgan Lloyd > markMLl .AT. telemetry.co .DOT. uk > > [Opinions above are the author's, not those of his employers or colleagues] > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal -- Best regards, JC Chu _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
