scala - 案例类字段的简单迭代

Question

我正在尝试编写一个通用方法来遍历case类的字段:
case class PriceMove(price: Double, delta: Double)def log(pm : PriceMove) { info("price -> " + price + " delta -> " + delta)}
我需要使log能够处理任何案例类。log仅用于处理案例类的参数类型和实际的通用字段迭代代码需要什么？

Answer 1

好吧，考虑到我所附的两个问题，这是我要使用的:

object Implicits {
  implicit class CaseClassToString(c: AnyRef) {
    def toStringWithFields: String = {
      val fields = (Map[String, Any]() /: c.getClass.getDeclaredFields) { (a, f) =>
        f.setAccessible(true)
        a + (f.getName -> f.get(c))
      }

      s"${c.getClass.getName}(${fields.mkString(", ")})"
    }
  }
}

case class PriceMove(price: Double, delta: Double)

object Test extends App {
  import Implicits._
  println(PriceMove(1.23, 2.56).toStringWithFields)
}

这将产生:

PriceMove(price -> 1.23, delta -> 2.56)