package algaeff

  1. Overview
  2. Docs
Reusable Effects-Based Components

Install

Dune Dependency

Authors

Maintainers

Sources

1.0.0.tar.gz
md5=203805788d40cba3bfa6f86f689f2561
sha512=865e575963b04d20711f4b2f7f95444c58ed039700a6771cf41088f05a0032c7b04190e9692a3e38cef93c976c9a0bb8a058466da11b871be84d344397e04a50

Description

This OCaml library collects reusable effects-based components we have identified while developing our proof assistants based on algebraic effects.

Published: 21 Sep 2023

README

README.markdown

# 🦠 Reusable Effects-Based Components

This library aims to collect reusable, general effects-based components we have seen when constructing our proof assistants using OCaml 5. All components here have appeared in various tutorials on algebraic effects; `algaeff` wraps these well-known components into an OPAM package.

## Stability

⚠ The API is experimental and unstable. We will break things!

## Components

- [Algaeff.State](https://redprl.org/algaeff/algaeff/Algaeff/State): mutable states
- [Algaeff.Reader](https://redprl.org/algaeff/algaeff/Algaeff/Reader): read-only environments
- [Algaeff.Sequencer](https://redprl.org/algaeff/algaeff/Algaeff/Sequencer): making a `Seq.t`
- [Algaeff.Mutex](https://redprl.org/algaeff/algaeff/Algaeff/Mutex): simple locking to prevent re-entrance
- [Algaeff.UniqueID](https://redprl.org/algaeff/algaeff/Algaeff/UniqueID): generating unique IDs
- [Algaeff.Unmonad](https://redprl.org/algaeff/algaeff/Algaeff/Unmonad): effects for any monadic operations

Effects-based concurrency (cooperative lightweight threading) was already tackled by other libraries such as [Eio](https://github.com/ocaml-multicore/eio) and [Affect](https://erratique.ch/software/affect). This library focuses on the rest.

There are a few other useful functions:

- [Algaeff.Fun.Deep.finally](https://redprl.org/algaeff/algaeff/Algaeff/Fun/Deep/index.html#val-finally): call `continue` or `discontinue` accordingly.
- [Algaeff.Fun.Shallow.finally\_with](https://redprl.org/algaeff/algaeff/Algaeff/Fun/Shallow/index.html#val-finally_with): same as above, but for shallow effect handlers.

## How to Use It

### OCaml >= 5.0.0

You need OCaml 5.

### Example Code

```ocaml
module S = Algaeff.State.Make (struct type state = int end)

let forty_two = S.run ~init:100 @@ fun () ->
  print_int (S.get ()); (* this will print out 100 *)
  S.set 42;
  S.get ()
```

### Documentation

[Here is the API documentation.](https://redprl.org/algaeff/algaeff/Algaeff)

Dependencies (2)

  1. ocaml >= "5.0"
  2. dune >= "2.0"

Dev Dependencies (3)

  1. odoc with-doc
  2. qcheck-core >= "0.18" & with-test
  3. alcotest >= "1.5" & with-test

Used by (3)

  1. asai < "0.3.0"
  2. forester >= "2.1" & < "3.0.0"
  3. yuujinchou >= "3.0.0" & < "5.2.0"

Conflicts

None

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