This is a very simple type:

data Exceptional x
  = Failure String
  | Success x

It's much like Maybe, except instead of Nothing, we have Failure String.

A comparison could also be made to Either String. I made this library because I was dissatisfied with the Monad instance for Either. In this type, fail = Failure. It's rather simple.

Changes

0.1.5.0

Add exceptIO function to encapsulate IO errors in the Exceptional monad.

0.1.4.3

Fix bug where exceptional won't compile on base < 4.8. Also move the changelog back to the description so it's more visible.

0.1.4.2

Moved change log to a separate file so Hackage displays it correctly.

0.1.4.1

Documentation enhancements/fixes.

0.1.4.0

Added fromMaybe and toMaybe functions, and a link to the bug tracker.

0.1.3.0

Fixed a typo. 0.1.2.0 won't build. Also added definition of empty for Alternative.

0.1.2.0

Added fromEither and toEither functions.

0.1.1.3

Hackage is terrible. Yet another formatting fix.

0.1.1.2

Yet another formatting fix.

0.1.1.1

Formatting fix to the haddock documentation.

0.1.1.0

Add runExceptional function.

0.1.0.1

Minor documentation changes. No changes to the API.

0.1.0.0

Initial version

---

[Skip to Readme]

Modules

[Index]

Downloads

• exceptional-0.1.5.1.tar.gz [browse] (Cabal source package)
• Package description (revised from the package)

Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

Package maintainers

• pharpend

For package maintainers and hackage trustees

• edit package information

Candidates

• No Candidates