tardis

Bidirectional state monad transformer

Version on this page:	0.3.0.0
LTS Haskell 24.17:	0.5.0
Stackage Nightly 2025-10-30:	0.5.0
Latest on Hackage:	0.5.0

See all snapshots tardis appears in

BSD-3-Clause licensed by Dan Burton

Maintained by [email protected]

This version can be pinned in stack with:tardis-0.3.0.0@sha256:51fc77f8633b82e66341915df8e81b191a7f46df13684b6db702d53fb8000218,1728

Module documentation for 0.3.0.0

Control
- Control.Monad
  - Control.Monad.Tardis
    - Control.Monad.Tardis.Class
  - Control.Monad.Trans
    - Control.Monad.Trans.Tardis

Depends on 2 packages(full list with versions):

base, mtl

A Tardis is a combination of both a forwards and a backwards state transformer, providing two state values that "travel" in opposite directions.

You can install this library with the use-undecidable-instances flag, but this feature is only provided for toying around. If you depend on this library, or install any libraries that depend on this library, then you should install this library without that flag.

A detailed description of what a Tardis is and how to use it can be found in the documentation for Control.Monad.Tardis.