[Haskell-cafe] Recommended class instances for container type

[Johan Tibell]

On Thu, Dec 8, 2011 at 8:12 AM, Christoph Breitkopf <
chbreitkopf at googlemail.com> wrote:

> Hello,
>
> I'm in the process of implementing a container data type, and wonder what
> class instances are generally considered necessary. E.g. is it ok to start
> out with a Show that's adequate for debugging, or is it a 'must' to include
> instances of everything possible (Eq, Ord if possible, Read, Show, Functor,
> ...).
>

Start out with Show and spend your time making sure that you're container
type performs well (unless you're doing this as an exercise of course). A
featureful API for something that's as slow as linked lists isn't very
useful. ;)

-- Johan
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