[Haskell-cafe] GetOpt

[Einar Karttunen]

On 27.04 12:32, Mirko Rahn wrote:
> So it would be much better to define the options in the library and to 
> provide this definitions to the user program somehow. I tought about 
> this topic several times and came up with a solution that works for me 
> but is far from being perfect. It uses existentials and a main 
> disadvantage is the need of explicit traversing. Moreover some new 
> boilerplate code is necessary.

HAppS has a typeclass for this kind of thing also:

http://test.happs.org/auto/apidoc/HAppS-Util-StdMain-Config.html
http://test.happs.org/HAppS/src/HAppS/Util/StdMain/Config.hs

and for an example instance see:

http://test.happs.org/HAppS/src/HAppS/Protocols/SimpleHTTP.hs

- Einar Karttunen