-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 28/05/13 14:41, harry wrote:
Magnus Therning
writes: Just to make sure... I guess you've already read http://www.haskell.org/haskellwiki/Heterogenous_collections right?
Yes, I'm asking why Haskell doesn't allow this directly. I'm already using a workaround.
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Simply because Haskell's lists are a homogeneous data structure by nature. Consider: data List a = Nil | Cons a List It doesn't do heterogeneous lists by default because it was never meant to. I don't see where the disappointment comes from. It's the same in majority of typed languages. I don't see why you would expect to be able to make have a heterogeneous list because you can do it with interfaces in some other language. To begin with, typeclasses are not interfaces. Just so you know, you're probably doing it wrong if you're using `a workaround' to have a heterogeneous list. - -- Mateusz K. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iQIcBAEBAgAGBQJRpLYdAAoJEM1mucMq2pqXzGIQAK4YapHZdtTdfUbFCZc90MF6 KbE5NmXswaKfgf+OU5Cs7fGG0dZahmeAEhFpZBVEUlnKXGT9hGiFQj7cm/4hK881 kGHWq5WlqGuzdnD9iTEG+IcLsqXQA1ZArObOFB2VL7dSzQHPhKHpnIshzID4osN6 QBo7fYvQ9H2Ng0sf5Cuo88ck0VGxKxvDPG8cg/6SpjH1EdPg3LlPiEYnZJoKbDnM G82IFctzANYuFbIXclD/DK6dlv/6newAR1Q5zXCD9ZQJv7y2z0mhA4gjbb4fUNGb 3y0wkj+srC6skC/1g871cQRC6u0aRSdGKYZIs2SwlKKFwUGftLlnq/KQukYuYuWi HB8H+jm3/tQDZEius9umVlQN6c56pglh+gY8p9bnAqOsw8gfSeM5qlEggSCs5wIh BpQBEOANMUKZRiRGrmx2FEl8IwdRcf5LUStFiI0EpabZDTpRQVRuG3K/LZpZS0em UPOfP/X0jDZAhxb/iiR91F+DnpzWrMkteP4mqQ9GpqY2RmXY3jw3B/1uC41mX17v NWfUULp4rRtcMPn2OvXYn28r3sCCO5D78rcGk2uv7Mmnb2HFq99XiaQG3Q7pzaB0 O4wePLuwFPZqefFuIl8WM68qjYFBeUJkOR3ik3Q1V2SftLMy8kFnDdz80DykOODw 2Sw+0P1Dyxk45ENu+Fry =rpvr -----END PGP SIGNATURE-----