问题
When I use scala to create a function like this,It told me that not found: type ?
scala
def save[
K: SpatialComponent: TypeTag,
V <: CellGrid: TypeTag: ? => TileMergeMethods[V]: ? => TilePrototypeMethods[V]
](id: LayerId, rdd: RDD[(K, V)] with Metadata[TileLayerMetadata[K]], method: KeyIndexMethod[K])
Can somebody told me how to resolve this?
回答1:
I got it,must add this code to build.sbt.
resolvers += Resolver.sonatypeRepo("releases")
addCompilerPlugin("org.spire-math" % "kind-projector" % "0.8.0" cross CrossVersion.binary)
https://github.com/non/kind-projector
来源:https://stackoverflow.com/questions/37914942/scala-generic-function-not-found-type