proxied
proxied
is a simple library that exports a function to convert constant functions to ones that take a proxy
value in the Data.Proxied
. This is useful for retrofiting typeclasses that have functions that return a constant value for any value of a particular type (but still need to consume some value, since one of the parameterized types must appear in a typeclass function). Often, these functions are given undefined
as an argument, which might be considered poor design.
Proxy
, however, does not carry any of the error-throwing risks of undefined
, so it is much more preferable to take Proxy
as an argument to a constant function instead of undefined
. Unfortunately, Proxy
wasn’t included in base
until GHC 7.8, so many of base
‘s typeclasses still contain constant functions that aren’t amenable to passing Proxy
. proxied
addresses this issue by providing variants of those typeclass functions that take an explicit proxy
value.
This library also contains the Data.Proxyless
module, which works in the opposite direction. That is, one can take functions which take Proxy
(or undefined
) as an argument and convert them to functions which take no arguments. This trick relies on the -XTypeApplications
extension, so it is only available with GHC 8.0 or later.