<％运算符在Scala泛型中是什么意思?

问题描述

限时删除！！

在specs2中，有一种名为Around的方法，在此处记录的具有以下示例:

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
  }
}

可以找到此代码的来源此处.

The source for this code can be found here.

我很好奇<％运算符在这种情况下的含义?

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

编辑:这是关于此主题的可靠答案，

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

推荐答案

这是一个视图绑定.这意味着 T 类型必须可转换为 Result 类型.有关类型边界的更多信息，我建议您 http://www.cs.uwaterloo.ca/~brecht/courses/702/Possible-Readings/scala/ProgrammingInScala.pdf ，从第61页开始.

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.

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