On Fri, 8 Feb 2008, Tom Hawkins wrote: > 5) Forget embedding the DSL, and write a direct compiler. > > In addition to the sharing problem, another shortcoming of Haskell > DSLs is they can not fully exploit the benefits of algebraic > datatypes. Specifically, pattern matching ADTs can only be used to > control the compile-time configuration of the target, it can't be used > to describe the target's behavior -- at least for DSLs that generate > code that executes outside of Haskell's runtime.
Also in a pure Haskell library you will try to avoid direct access to constructors, because the internal data structures might change. Better are functions that access the internal data of a type, like 'maybe' and 'either' for 'Maybe' and 'Either', respectively. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
