Copyright	(C) 2013-16 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	Control.Exception
Safe Haskell	None
Language	Haskell2010

System.Exit.Lens

Description

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

Synopsis

class AsExitCode t where
- _ExitCode :: Prism' t ExitCode
_ExitFailure :: AsExitCode t => Prism' t Int
_ExitSuccess :: AsExitCode t => Prism' t ()
pattern ExitFailure_ :: AsExitCode s => Int -> s
pattern ExitSuccess_ :: AsExitCode s => s

Documentation

class AsExitCode t where #

Exit codes that a program can return with:

Methods

_ExitCode :: Prism' t ExitCode #

Instances

Instances details

AsExitCode ExitCode #
Instance details Defined in System.Exit.Lens Methods _ExitCode :: Prism' ExitCode ExitCode #
AsExitCode SomeException #
Instance details Defined in System.Exit.Lens Methods _ExitCode :: Prism' SomeException ExitCode #

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

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 () #

indicates successful termination;

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

pattern ExitFailure_ :: AsExitCode s => Int -> s #

pattern ExitSuccess_ :: AsExitCode s => s #