John Meacham wrote:
>I should say that efficiency is the only thing I have been concerned >about in this conversation. As I said in the mdo proposal, there is no >efficient and safe way to do global variables in haskell.
I think George Russell's library (with a simple extension) can be used to create global variables safely and with the same per-access efficiency as the other proposals:
http://www.mail-archive.com/haskell@haskell.org/msg15709.html
>Your library addresses a different issue, it provides an interface >for global variables, but it doesn't address the fundamental problem >that your library or ones like it cannot be implemented in haskell. >[...much elaboration on this idea omitted...]
I think I completely answered this objection in another message yesterday:
http://www.mail-archive.com/haskell@haskell.org/msg15723.html
In short, his proposal should be considered in the same light as yours, as a /primitive/ extension to Haskell. (But I'd prefer you respond to my previous message rather than that sentence.)
-- Ben
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