base-4.11.1.0: Basic libraries

Copyright(c) Adam Gundry 2015-2016
Licensesee libraries/base/LICENSE
Maintainercvs-ghc@haskell.org
Stabilityinternal
Portabilitynon-portable (GHC extensions)
Safe HaskellSafe
LanguageHaskell2010

GHC.Records

Description

This module defines the HasField class used by the OverloadedRecordFields extension. See the <https://ghc.haskell.org/trac/ghc/wiki/Records/OverloadedRecordFields wiki page> for more details.

Synopsis
  • class HasField (x :: k) r a | x r -> a where

    Documentation

    class HasField (x :: k) r a | x r -> a where Source #

    Constraint representing the fact that the field x belongs to the record type r and has field type a. This will be solved automatically, but manual instances may be provided as well.

    Minimal complete definition

    getField

    Methods

    getField :: r -> a Source #

    Selector function to extract the field from the record.