(or Yet Another Scala Units Library)
scunits is an experimental, extensible library for type-checking dimensional quantities and handling units of measure in scala. Exponents of base quantities (mass, time, etc.) are stored at the type-level in recursive list structures similar to shapeless's hlists, but without any run-time instances. All measurements are stored as Doubles of their appropriate SI unit and only converted to a specific unit when needed.
- Type safe comparisons, arithmetic and more.
- All measurements (
Scalar) are Value Classes wrapping Doubles. Performance is identical to Doubles once the JIT is warm. - New base quantities may be added.
- Dimensions (
Dims), units (UnitM) and measurements (Scalar) may be composed by multiplication and division - All SI prefixes (kilo, centi, etc.)
- Array wrappers (
ArrayM) for unboxed arrays - < 200k jar file size (for now...)
- No dependencies
- Reasonable compilation times: https://github.com/gbeaty/scunits/blob/master/compile-bench/Bench.scala
See: https://github.com/gbeaty/scunits/blob/type-logic/test/src/test/scala/Examples.scala
scunits is not curretly in a maven repository. You'll have to git clone https://github.com/gbeaty/scunits.git, run sbt publish-local, then add "org.scunits" %% "core" % "0.0.2-SNAPSHOT" to your project dependencies.