Re: [Haskell-cafe] data type declaration

On 25 July 2010 13:09, Andrew Coppin wrote:

This is not valid in Haskell '98. This is actually a type system extension known as "multi-parameter type classes", which do not even vaguely correspond to anything in normal OOP. (Except for being very slightly similar to generics, perhaps.)

Closest perhaps to multimethods in Cecil and and I think CLOS - though multimethods in CLOS does seem to take things far out into space with :before :after and :around.