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| John Meacham | Oct 12, 2005 7:41 pm | |
| Philippa Cowderoy | Oct 12, 2005 7:55 pm | |
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| Wolfgang Jeltsch | Oct 13, 2005 5:48 am | |
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| Malcolm Wallace | Oct 13, 2005 6:29 am | |
| John Meacham | Oct 13, 2005 6:37 am | |
| John Meacham | Oct 13, 2005 6:39 am | |
| Simon Peyton-Jones | Oct 13, 2005 7:02 am | |
| Benjamin Franksen | Oct 13, 2005 7:26 am | |
| Benjamin Franksen | Oct 13, 2005 7:33 am | |
| S.M.Kahrs | Oct 13, 2005 7:37 am | |
| John Meacham | Oct 13, 2005 8:32 am | |
| Simon Peyton-Jones | Oct 13, 2005 9:23 am | |
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| David Menendez | Oct 13, 2005 6:49 pm | |
| John Meacham | Oct 13, 2005 8:33 pm | |
| aj...@spamcop.net | Oct 13, 2005 11:25 pm | |
| Ashley Yakeley | Oct 14, 2005 6:20 am | |
| Ashley Yakeley | Oct 14, 2005 6:31 am | |
| Wolfgang Jeltsch | Oct 14, 2005 9:46 am | |
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| Remi Turk | Oct 14, 2005 2:05 pm | |
| Udo Stenzel | Oct 15, 2005 6:15 am | |
| Ross Paterson | Oct 27, 2005 6:58 am | |
| Wolfgang Jeltsch | Oct 28, 2005 7:05 am |
| Subject: | [Haskell] PROPOSAL: class aliases | |
|---|---|---|
| From: | aj...@spamcop.net (aj...@spamcop.net) | |
| Date: | Oct 13, 2005 11:25:29 pm | |
| List: | org.haskell.haskell | |
G'day all.
Quoting Simon Peyton-Jones <simo...@microsoft.com>:
I've considered this before, but never done anything about it because superclasses are so close. Specifically, what is the difference between
(i) class (C a, D a) => CD a and (ii) class alias CD a = (C a, D a)
Note that (i) is Haskell 98.
To be a true typeclass synonym, there would also be an implied default instance:
class (C a, D a) => CD a instance (C a, D a) => CD a
...and this is not Haskell 98.
Cheers, Andrew Bromage





