Knowing if the Scala object is an instance of the Case class

Question

I was wondering if there is a way to find out if an object is an instance of the case class. I tried to find some structural type corresponding unapply, I noticed that they inherit Product. My real need is for a function that will look something like this:

def withCaseClass[T <: /* matcher for case class */](obj:T) ...

My main interest is to make sure that only case classes can be passed to this function.

Answer 1

A case classis the implementation detail. You can create a class that acts just like the case class, and the ability to do this is a very important thing, because it allows you to switch to a normal class if a particular requirement makes this choice better.

Answer 2

case , , , Product - , "scala. *".:/

Answer 3

How can you do the same thing “manually”, which the compiler does for the case classes, and because the bytecode received will be indistinguishable (even the word “looks funny ...), you are out of luck, the real question is: why do you need this ?

Answer 4

In Java, I used

Product.class.isAssignableFrom(someClassThatMayBeACaseClass);

to determine if something is a case class. Although there are probably products that do not belong to classes.