Re: RFC 188 (v1) Objects : Private keys and methods
[email protected] (Damian Conway) Mon, 18 Sep 2000 10:38:05 +1100 (EST)
| Newsgroups | perl.perl6.language.objects |
|---|---|
| Message-ID | <[email protected]> |
> This is an interesting proposal, but it seems to be missing > something, or maybe I am. It seems like once a single hash entry is > marked private, that it is then impossible to mark future entries > non-private...i.e. there is no corresponding unary "public" > function. That's right. Perhaps it's too fascist. I'll think about it. > However, it seems that one side effect of achieving this is that > the hash of interest can no longer be used to present public data > of classes inheriting from it--they have no mechanism to add new > public data to the hash inherited from the superclass. While some > might argue that this is good, others might argue that it is bad, > and in the presence of such differing opinions, it certainly seems > like that choice should be left to the class author. That can easily be achieved with a "public" keyword to parallel private. > The proposal also seems to leave somewhat unspecified what happens > to other existing non-private keys that were already in the hash at > the time the first private key was added. Do they continue to be > directly accessible via their names? Yes. That's required to allow "private" to be used to extend pre-existing classes cleanly. > Do they also get qualified with the package name? No. > Is it an error > to insert a private key into a hash already containing > non-private keys? ...of the same name...yes. I will make these clearer in the next version, Thanks, Damian