Am Donnerstag, 24. November 2005 21:37 schrieb Fan Wu: > [...] > This is a good example! But now I got the impression that pattern > match failure could happen in many places, so unless you want it to > fail loudly, you shall always use lazy pattern?
Often you need pattern matching for distinguishing different cases (e.g., empty vs. non-empty list). In these cases, lazy patterns are useless. Our discussion was only about lazy patterns in conjunction with tuples. The deeper reason for using lazy patterns was that we actually want unlifted tuples (because we just want to group several things together) while Haskell provides us only with lifted tuples. In such cases it might be generally advisable to use lazy patterns. An alternative to using lazy patterns would be to use unlifted tuples which come as an extension with GHC, named "unboxed tuples" there. > Thanks, > Fan Best wishes, Wolfgang _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
