On Tue, Mar 03, 2009 at 01:53:44AM -0500, wren ng thornton wrote: > If you're just wanting to build Exprs, then the canonical solution is to > use ':' as in (:>), (:>=), (:==), (:/=), (:<=), (:<). The colon is > considered a "capital symbol" and so it's what you use as the first letter > of symbolic constructors. For symmetry, many folks will ad another colon at > the end as well. > > > data Expr = Const Integer | Expr :+: Expr | Expr :*: Expr | Expr :>: > Expr | ... >
Alas, in several instances (too long to give here) it's impractical to write the DSL just as constructors--several of the operators have to do nontrivial computation. (Plus, I'd still call the :*: solution ugly, personally.) Is it possible to do better? AHH _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
