data-default-instances-new-base

Default instances for types in newer versions of base package. https://github.com/trskop/data-default-extra

Latest on Hackage:0.0.2

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BSD3 licensed by Peter Trško
Maintained by peter.trsko@gmail.com

data-default-instances-new-base

[Hackage][data-default-instances-new-base] Hackage Dependencies [Haskell Programming Language][Haskell.org] [BSD3 License][tl;dr Legal: BSD3]

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Description

Orphan instances for Default type class, which is defined in package [data-default-class][].

In addition to instances reexported from [data-default-instances-base][] package, following Default instances are provided:

instance Default a => Default (Const a b) where
    def = Const def

instance Monad m => Default (Kleisli m a b) where
    def = Kleisli return

instance Default Version where
    def = Version [] []

Following instances are available only for base >= 4.7.0.0:

instance Default (Proxy a) where
    def = Proxy

instance Default SomeNat where
    def = SomeNat (Proxy :: Proxy 0)

instance Default SomeSymbol where
    def = SomeSymbol (Proxy :: Proxy "")

Following instances are available only for base >= 4.8.0.0:

instance Alternative f => Default (Alt f a) where
    def = Alt empty

instance Default a => Default (Identity a) where
    def = Identity def

instance Default Natural where
    def = 0

Following instances are available only for base >= 4.9.0.0:

instance Default a => Default (NonEmpty a) where
    def = def :| []

instance 'Bounded' a => Default (Min a) where
    def = minBound

instance Bounded a => Default (Max a) where
    def = maxBound

instance 'Default' ('Option' a) where
    def = Option Nothing

This package is intended to be used in conjunction with [data-default][] package or directly with [data-default-class][] package.

License

The BSD 3-Clause License, see [LICENSE][] file for details.

Contributions

Contributions, pull requests and bug reports are welcome! Please don't be afraid to contact author using GitHub or by e-mail.

https://hackage.haskell.org/package/base "Package base on Hackage" [data-default]: https://hackage.haskell.org/package/data-default "Package data-default on Hackage" [data-default-class]: https://hackage.haskell.org/package/data-default-class "Package data-default-class on Hackage" [data-default-instances-base]: https://hackage.haskell.org/package/data-default-instances-base "Package data-default-instances-base on Hackage" [data-default-instances-new-base]: https://hackage.haskell.org/package/data-default-instances-new-base "Package data-default-instances-new-base on Hackage" [Haskell.org]: http://www.haskell.org "The Haskell Programming Language" [LICENSE]: https://github.com/trskop/data-default-extra/blob/master/instances-new-base/LICENSE "License of data-default-instances-new-base package." [tl;dr Legal: BSD3]: https://tldrlegal.com/license/bsd-3-clause-license-%28revised%29 "BSD 3-Clause License (Revised)"

Changes

ChangeLog / ReleaseNotes

Version 0.0.1

Version 0.0.1.1

  • Support for data-default-class ==0.1.*.
  • Avoiding dependency on data-default-instances-base when building with data-default-class >=0.1.2.

http://hackage.haskell.org/ "HackageDB (or just Hackage) is a collection of releases of Haskell packages."

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