-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 8/31/10 13:27 , michael rice wrote:
So it's a type constructor, not a type? Could you please provide a simple example of its usage?
Assuming you don't mean the trivial use in defining functions, see Control.Monad.Instances:
instance Functor ((->) r) where fmap = (.)
instance Monad ((->) r) where return = const f >>= k = \ r -> k (f r) r
(The above is the primitive reader functor/monad, see Control.Monad.Reader for more information.) - -- brandon s. allbery [linux,solaris,freebsd,perl] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.10 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkx9Z4EACgkQIn7hlCsL25WgrwCgvFQlObavv1fNOaKDjB/qbk8t 8+IAoLUrenXFzZFfJoYYvSy00uPctnaE =ljiY -----END PGP SIGNATURE-----