# rec-def: Recursively defined values

This library provides safe APIs that allow you to define and calculate values recursively, and still get a result out:

let s1 = RS.insert 23 s2 s2 = RS.insert 42 s1 in RS.get s1

will not loop, but rather produces the set `fromList [23,42]`

See Data.Recursive.Examples for more examples, or just browse the modules

More APIs (e.g. for maps or `Natural`

) can be added over time, as need and good
use-cases arise.

For the (unsafe) building blocks to build such APIs, see

Data.Propagator.Purify for the wrapper that turns an IO-implemented propagator into a pure data structure

Data.Propagator.Naive for a naive propagator implementation

Data.Propagator.P2 for a smarter propagator implementation for the two-point lattice, i.e.

`Bool`

The library is not (yet) focussed on performance, and uses a rather naive propagator implementation. Expect this to be slow if you have large graphs. This may be improved in the future (e.g. by propagating only deltas, and accumulating deltas before applying a function), but for now the focus is on foremost providing this capability in the first place and getting the user-facing API right.

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#### Maintainer's Corner

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Versions [RSS] | 0.1, 0.2, 0.2.1, 0.2.2 |
---|---|

Change log | CHANGELOG.md |

Dependencies | base (>=4.9 && <5), containers (>=0.5.11 && <0.8) [details] |

Tested with | ghc ==9.6.1, ghc ==9.4.4, ghc ==9.2.7, ghc ==9.0.2, ghc ==8.10.7, ghc ==8.8.4 |

License | BSD-2-Clause |

Copyright | 2022 Joachim Breitner |

Author | Joachim Breitner |

Maintainer | mail@joachim-breitner.de |

Revised | Revision 1 made by JoachimBreitner at 2024-10-26T18:24:36Z |

Category | Data |

Home page | https://github.com/nomeata/haskell-rec-def |

Bug tracker | https://github.com/nomeata/haskell-rec-def/issues/new |

Source repo | head: git clone git://github.com/nomeata/haskell-rec-def |

Uploaded | by JoachimBreitner at 2023-08-19T08:13:31Z |

Distributions | LTSHaskell:0.2.2, NixOS:0.2.2, Stackage:0.2.2 |

Downloads | 473 total (26 in the last 30 days) |

Rating | (no votes yet) [estimated by Bayesian average] |

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Status | Docs available [build log] Last success reported on 2023-08-19 [all 1 reports] |