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finitary-optics: Prisms and Isos between finitary types.

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Provides convenience optics for working with finitary types. Specifically gives an Iso for inter-converting between types of the same cardinality, and a Prism for inter-converting between types of different cardinalities.

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Versions [RSS] 1.0.0.0
Change log CHANGELOG.md
Dependencies base (>=4.12 && <5), finitary (>=2.0.0.0 && <2.2), finite-typelits (>=0.1.4.2 && <0.2), optics-core (>=0.3 && <0.4) [details]
Tested with ghc ==8.6.5 || ==8.8.3 || ==8.10.1 || ==9.0.1
License GPL-3.0-or-later
Copyright (C) Koz Ross 2019
Author Koz Ross
Maintainer Sam Derbyshire
Revised Revision 2 made by sheaf at 2021-02-09T19:25:13Z
Category Data
Home page https://notabug.org/sheaf/finitary-optics
Uploaded by koz_ross at 2020-06-06T00:02:31Z
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Downloads 309 total (6 in the last 30 days)
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Readme for finitary-optics-1.0.0.0

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finitary-optics

What's this all about, then?

If a type has an instance of Finitary, we know the type's cardinality n, and can convert any (non-bottom) inhabitant to a value of Finite n. We can use this to inter-convert between these types. This can sometimes be useful.

This library provides some optics (specifically a Prism and an Iso) which help us do this kind of conversion more conveniently.

Sounds good! Can I use it?

We've tested this library on GHCs 8.6.5, 8.8.3 and 8.10.1, on GNU/Linux x86_64. If you use this library on any other platforms, let us know how it goes - especially if something breaks!

License

This library is under the GNU General Public License, version 3 or later (SPDX code GPL-3.0-or-later). For more details, see the LICENSE.md file.