Scala案例类复制实现 [英] scala case class copy implementation

问题描述

我找不到如何在Scala中为案例类实现复制.

I can't find how copy is implemented for case class in scala.

我可以以某种方式检查它吗?

Can I check it somehow?

我虽然Intellij可以指出我要实现，但是它不想跳转，我也不知道为什么:/

I though Intellij could point me to implementation, but it doesn't want to jump and I have no idea why :/

推荐答案

您可以使用 scalac -print ClassName.scala 作为 copy 检查scala case类的输出.实际上是编译器生成的方法.

You can inspect the scala case class output using scalac -print ClassName.scala, as the copy is actually a compiler generated method.

这是一个给定的例子:

case class Test(s: String, i: Int)

这是滤除 copy 的噪声后的输出:

This is the output after filtering out noise for copy:

case class Test extends Object with Product with Serializable {
    private[this] val s: String = _;
    def s(): String = Test.this.s;

    private[this] val i: Int = _;
    def i(): Int = Test.this.i;

    def copy(s: String, i: Int): common.Test = new common.Test(s, i);
    def copy$default$1(): String = Test.this.s();
    def copy$default$2(): Int = Test.this.i();
}

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