What does the <% operator mean in Scala generics? [duplicate]

问题

This question already has an answer here:

What are Scala context and view bounds? (1 answer)

Closed 15 days ago.

In specs2 there is a method called Around, documented here that has the following example:

object http extends Around {
  def around[T <% Result](t: =>T) = openHttpSession("test") {
    t  // execute t inside a http session
  }
}

The source for this code can be found here.

I'm curious what the <% operator means in this context?

EDIT: here is a solid answer on this subject, What are Scala context and view bounds?

回答1:

This is a view bound. It means, that the type T must be convertible to the type Result. For more information about type bounds I recommend you http://www.cs.uwaterloo.ca/~brecht/courses/702/Possible-Readings/scala/ProgrammingInScala.pdf, starting at page 61.

来源：https://stackoverflow.com/questions/11515940/what-does-the-operator-mean-in-scala-generics