linear-base: Standard library for linear types.

[ library, mit, prelude ] [ Propose Tags ]

Please see

[Skip to Readme]


[Index] [Quick Jump]


Maintainer's Corner

Package maintainers

For package maintainers and hackage trustees


  • No Candidates
Versions [RSS] 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.4.0
Change log
Dependencies base (>=4.16 && <5), containers, ghc-prim, hashable, linear-generics (>=0.2), primitive, storable-tuple, text, transformers, vector (>=0.12.2) [details]
License MIT
Copyright (c) Tweag Holding and affiliates
Author Tweag
Category Prelude
Home page
Source repo head: git clone
Uploaded by aspiwack at 2023-10-13T13:37:13Z
Distributions Arch:0.3.0, LTSHaskell:0.4.0, NixOS:0.3.1, Stackage:0.4.0
Reverse Dependencies 4 direct, 10 indirect [details]
Downloads 1532 total (87 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Docs available [build log]
Last success reported on 2023-10-13 [all 1 reports]

Readme for linear-base-0.4.0

[back to package description]

Linear base

License MIT Build status Hackage Stackage

Linear base is a standard library for developing applications with linear types. It is named linear-base to be an analog to the original base package that ships with GHC.

The purpose of linear-base is to provide the minimal facilities you need to write practical Linear Haskell code, i.e., Haskell code that uses the -XLinearTypes language extension.


Why do you need linear-base to write linear projects?

  1. Data types, functions and classes in base are not linear types aware. For instance, if n is a linearly-bound Int, the RHS of a definition cannot write n + 1 — this will not type check. We need linear variants of Num, Functors, Monads, ($), etc.

  2. This library exports new abstractions that leverage linear types for resource safety or performance. For example, there are new APIs for file and socket I/O as well as for safe in-place mutation of arrays.

Getting started

-XLinearTypes is released with GHC 9, and linear-base is released on Hackage and Stackage.

All source files with linear types need a language extension pragma at the top:

{-# LANGUAGE LinearTypes #-}

User Guide

If you already know what -XLinearTypes does and what the linear arrow a %1-> b means, then read the User Guide and explore the examples/ folder to know how to use linear-base.

You can also find a table comparing base and linear-base typeclasses here.

Learning about -XLinearTypes

If you're a Haskeller who hasn't written any Linear Haskell code, don't fear! There are plenty of excellent resources and examples to help you.

Tutorials and examples

Reading material



Linear base is maintained by Tweag.

To contribute please see the Design Document for instructions and advice on making pull requests.


See the Licence file.

Copyright © Tweag Holding and its affiliates.