I recently had to dive a bit into C++ again, and reconnected with a feature I liked at first sight, the C++ covariance of virtual methods (changing the return type of a overriden method to a descendant of the original type). Googling a bit it seems that some languages(C#) also seem to allow this for parameters. (not just return types)
I suddenly wondered why it was never proposed or talked about for FPC, since it seems such a nice feature. Is there something particularly wrong with it? To a certain degree it can be emulated with generics, but that it requires a generic for every type, and must be prepared in the library code. _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
