Scala setters - 多个参数

Question

我可以在setter中使用多个参数吗？

例如:

private var _a = 0
def a = _a
def a_= (b: Int, c: Int) = _a = b + c

如果是,我该如何调用setter方法？

Answer 1

元组怎么样？

class A {
  private var _a = 0
  def a = _a
  def a_= (t: (Int, Int)) {
    _a = t._1 + t._2
  }
}

如果您不喜欢笨拙的元组访问语法:

class A {
  private var _a = 0
  def a = _a
  def a_= (t: (Int, Int)) {
    t match {
      case(b, c) => _a = b + c
    }
  }
}

用法:

val x = new A()
x.a = (3, 7)
x.a  //10