Thanks Brandon, forgot to send my reply to the list:
Ok, so I am confusing things. Good to know. So my question is how do I
fulfill this scenario?
- I have an action that might return either an HttpResponse or an
HttpRequest, depending on if the IO in the action determined more work
needed doing. It's here, though I doubt it's "correct" yet:
requestHandler :: HttpRequest -> IO HttpResponse
requestHandler request = do
session <- sessionHandler request
ret <- uriHandler request
case ret of
HttpResponse -> ret
HttpRequest -> resourceHandler session ret
uriHandler :: HttpRequest -> IO HttpMessage
sessionHandler :: HttpRequest -> IO HttpSession
I've given the uriHandler a signature of IO HttpMessage because the
HttpMessage might be either an HttpResponse or an HttpRequest, and I
don't know how I should be specifying that. Ideas?
- Stephen
Brandon S. Allbery KF8NH wrote:
On Jun 18, 2008, at 15:31 , Stephen Howard wrote:
HttpMessage.hs:36:20: Not in scope: type constructor or class
`HttpRequest'
The troublesome line is the definition of the cookie function at the
end of the code. I've made
Right. "HttpRequest" is a data constructor associated with the type
constructor "HttpMessage".
(Data constructors are effectively functions; you used it in the
context of a type, not a function name.)
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