Copyright	(C) 2013-15 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	Control.Exception
Safe Haskell	None
Language	Haskell98

System.Exit.Lens

Description

These prisms can be used with the combinators in Control.Exception.Lens.

Synopsis

Documentation

class AsExitCode t where Source

Exit codes that a program can return with:

Minimal complete definition

Nothing

Methods

_ExitCode :: Prism' t ExitCode Source

Instances

AsExitCode ExitCode
AsExitCode SomeException

_ExitFailure :: AsExitCode t => Prism' t Int Source

indicates program failure with an exit code. The exact interpretation of the code is operating-system dependent. In particular, some values may be prohibited (e.g. 0 on a POSIX-compliant system).

_ExitFailure :: Prism' ExitCode      Int
_ExitFailure :: Prism' SomeException Int

_ExitSuccess :: AsExitCode t => Prism' t () Source

indicates successful termination;

_ExitSuccess :: Prism' ExitCode      ()
_ExitSuccess :: Prism' SomeException ()