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This is an implementation of unsigned integers for Scala. This is still very much a work in progress.
Much of it was written a while ago as an exercise in learning Scala.

The library provides:

  • UInt
  • ULong
  • UByte
  • UShort

The classes are implemented by boxing Int, Long, Byte, Short, respectively.

To use:

scala> import passera.unsigned._

scala> (-1).toUInt
res0: passera.unsigned.UInt = 4294967295

scala> res0 + 1
res1: Int = 0


The code was written by Nate Nystrom (


Add support for value classes.

Refactor code to remove redundant ULong code.

More tests.