This code is from com.softwaremill.tagging
This code is from com.softwaremill.tagging
Tag instances with arbitrary types. The tags are usually empty traits. Tags have no runtime overhead and are only
used at compile-time for additional type safety.
For example:
class Berry() trait Black trait Blue val berry = new Berry() val blackBerry: Berry @@ Black = berry.taggedWith[Black] val blueBerry: Berry @@ Blue = berry.taggedWith[Blue] // compile error: val anotherBlackBerry: Berry @@ Black = blueBerry
Original idea by Miles Sabin, see: https://gist.github.com/milessabin/89c9b47a91017973a35f