Question

我正在尝试执行以下操作：

case class Params(param1: Int, param2: String)

class EntityCreator {
  def create(param1:  Int, param2: String): Int = {
    ...
  }

  def create(params: Params): Int = 
    // extract a tuple from params and pass it to create
    create _ tupled Params.unapply(params).get 
}

它给出了以下编译错误：

error: ambiguous reference to overloaded definition,
both method create in class EntityCreator of type (params: Params)Int
and  method create in class EntityCreator of type (param1: Int, param2: String)Int
match expected type ?

       create _ tupled Params.unapply(params).get

有没有办法告诉Scala编译器我指的是哪两个创建函数？

Answer 1

当您使用create _时，编译器无法决定使用哪个创建函数，因为在这种情况下它们都有效。你必须明确指定像这样的类型信息

((param1: Int, param2: String) => create(param1, param2)) tupled Params.unapply(params).get

此时你可以使用
def create(params: Params): Int = create(params.param1, params.param2)

消除对重载定义的模糊引用

1 个答案: