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Date: | 2007-04-30 (14:35) |
From: | Joel Reymont <joelr1@g...> |
Subject: | camlp4 3.10: Tuple processing |
Looking at Martin's json code I find this example of tuple conversion in the old syntax: | Tuple l -> let tl = List.map convert l in <:ctyp< ( $list:tl$ ) >> In the new syntax the same code becomes something much larger: | Tuple l -> (* (* Development version post-3.10.0+beta: *) let tl = List.map convert l in <:ctyp< ( $tup:Ast.tySta_of_list tl$ ) >> *) let t = List.fold_right (fun x tup -> <:ctyp< $convert x$ * $tup$ >>) l <:ctyp< >> in <:ctyp< $tup:t$ >> What is the advantage of the new approach and how did it become so verbose? Thanks, Joel [1] http://martin.jambon.free.fr/examples/pa_json_static_3100beta.html -- http://wagerlabs.com/