Question

我想使用scala将特性传递给抽象类，这是我到目前为止所做的：

trait User extends VertexFrame {}

trait Member extends VertexFrame {}

object Member extends Base[Member] {}

object User extends Base[User] {}

abstract class Base[T <: VertexFrame: Manifest] {
  // Here if want to be able to access my "trait User" or my "trait Member"
  def list = {
   graph.frameVertices(graph.getVertices, manifest[T].runtimeClass).toList
  }
}

图表：http://www.tinkerpop.com/docs/javadocs/frames/2.0.0/com/tinkerpop/frames/FramedGraph.html

Answer 1

看看这是否是你要找的东西（根据你的评论）：

abstract class Base[T <: VertexFrame: Manifest] { self =>
  // Here if want to be able to access my "trait User" or my "trait Member"
  def test = manifest[T].runtimeClass
}

Answer 2

在您的代码中，泛型类型是多余的。您的伴随对象扩展了抽象Base类，这可以用于自我类型注释，如@ om-nom-nom shows

Scala将特征传递给抽象类

2 个答案: