exceptional: Essentially the Maybe type with error messages.

[ bsd2, control, library ] [ Propose Tags ]

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

0.1.2.0
Add 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

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Versions [faq] 0.1.0.0, 0.1.0.1, 0.1.1.0, 0.1.1.1, 0.1.1.2, 0.1.1.3, 0.1.2.0, 0.1.3.0, 0.1.4.0, 0.1.4.1, 0.1.4.2, 0.1.4.3, 0.1.5.1, 0.2.0.0, 0.3.0.0 (info)
Dependencies base (==4.*) [details]
License BSD-2-Clause
Copyright Copyright (c) 2015, Peter Harpending.
Author Peter Harpending
Maintainer peter@harpending.org
Category Control
Home page https://github.com/pharpend/exceptional
Source repo head: git clone https://github.com/pharpend/exceptional.git -b master
this: git clone https://github.com/pharpend/exceptional.git -b master(tag 0.1.2.0)
Uploaded by pharpend at Thu May 14 23:22:02 UTC 2015
Distributions LTSHaskell:0.3.0.0, NixOS:0.3.0.0, Stackage:0.3.0.0
Downloads 5324 total (16 in the last 30 days)
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Status Hackage Matrix CI
Docs not available [build log]
All reported builds failed as of 2016-12-09 [all 7 reports]

Modules

  • Control
    • Control.Exceptional

Downloads

Maintainer's Corner

For package maintainers and hackage trustees


Readme for exceptional-0.1.2.0

[back to package description]

exceptional

This is a Haskell library that exists to house a 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.

Installing

cabal install exceptional

Or, add exceptional to the build-depends field in your .cabal file.