Dan Sugalski <[EMAIL PROTECTED]> wrote:We need the ability to layer PMCs. Nothing new, we need something of the sort for transparent read-only-ness and probably thread-safety
What about the current implementation [1]: * PMCs that have read-only variants have the C<const_too> flag set * the PMC compiler creates a second set of vtables with all mutating vtable slots set to functions that throw exceptions
Combinatorial explosion. This already requires four variants (normal, const, threadsafe, const threadsafe), and we haven't even seen what real users will want to do with PMCs yet. (I could imagine, for example, people wanting to push a transcoding layer onto a string or aggregate PMC, which forces all incoming strings into a certain encoding. Or a layer that lowercases incoming keys. Or, or, or...)
-- Brent "Dax" Royal-Gordon <[EMAIL PROTECTED]> Perl and Parrot hacker
Oceania has always been at war with Eastasia.
