sciss / poirot   0.3.1

Contributors Wanted GNU Affero General Public License v3.0 GitHub

A Scala front-end for the JaCoP constraints solver library. Mirror of

Scala versions: 2.13 2.12 2.11 2.10


Build Status Maven Central


Poirot is a Scala front-end for the JaCoP constraints solver library. It was originally based on the Scala DSL included with JaCoP, written and (C)opyright by Krzysztof Kuchcinski and Radoslaw Szymanek. All modifications and new interface (C)opyright 2013–2020 by Hanns Holger Rutz. All rights reserved.

Poirot is released under the GNU Affero General Public License and comes with absolutely no warranties. Please see the JaCoP website for supplementary AGPL terms. To contact the author, send an e-mail to contact at


To use this project as a library, use the following artifact:

"de.sciss" %% "poirot" % v

The current version v is 0.3.1


This project currently builds with sbt against Scala 2.13 and 2.12. It requires the JaCoP 3.5.0 artifact published under the de.sciss group ID. It should be automatically retrieved from Maven Central.

To compile, use sbt compile, for the API docs sbt doc, to jump into a REPL sbt console.


Please see the file

differences to the original Scala DSL

  • You must use an implicit instance of Model
  • Operators follow standard Scala naming, e.g. |, &, ^ instead of \/, /\, xor for boolean combinators
  • Standard Scala style, e.g. argument names, camel case etc.; more consistent use of empty parens
  • Removing unnecessary things such as ClassTags
  • Removing global state when possible
  • BoolVar is called BooleanVar, FloatVar is called DoubleVar.

## getting started

You need evidence of a Model instance for most operations. Constraints are automatically posted to that model. Examples are provided in the test directory, you can selectively run them via sbt test:run. If you write small self containing problems, you may mix in the Problem trait which provides exactly one model (store).

For example, have a look at the standard n-Queens problem, Queen.scala.


I am currently figuring out how to best handle the syntax. No all methods from the original Scala DSL are implemented.

I have only worked with int and boolean variables, so pretty much everything regarding SetVar, IntSet, FSM, Network is not tested or cleaned up.