Re: [Haskell-cafe] Stateful DSLs

Excerpts from Günther Schmidt's message of Fri Sep 17 13:27:45 -0400 2010:

I'd want to create a EDSL where I want to be able to statically ensure that expressions can only be built according to a particular "state".

Like in a network application, SMTP client for example, where I can only issue commands if the application is in a certain state.

Are there any Haskell examples for this sort of thing?

Hello Gunther, I believe what you are describing is called "session types". There are several session type encodings on Hackage: sessions, simple-sessions and full-sessions. However, I don't think they're really ready to be used on actual projects. Cheers, Edward