I'm trying to use a room entity with a value class: @JvmInline value class UserToken(val token: String) and the entity: @Entity(tableName = TABLE_AUTH_TOKEN) data class TokenEntity( @PrimaryKey v...

When I define Wrapper as value class(extending AnyVal): class Wrapper(val string: String) extends AnyVal def wrapperHolder(w: Wrapper): {def wrapper: Wrapper} = new { def wrapper: Wrapper = w } ...

I just cannot override hashCode() function on value class. minimal example (I know that in this example there is no need to override it...) @JvmInline value class Identifier(val value: String){ ov...

We have two projects, and the kotlin one publishes a package that's imported by java. In kotlin, is a value class like @JvmInline value class CountryId(private val id: UUID) { override fun toStrin...

Assuming I have a value case class case class Id(i:Int) extends AnyVal and a sequence containing this value case class Seq(Id(1), Id(2), Id(3)) is there a way of converting those values into...

I'm writing a set of implicit Scala wrapper classes for an existing Java library (so that I can decorate that library to make it more convenient for Scala developers). As a trivial example, let's ...

I'm seeking some clarification to the definition of Value-based Classes. I can't imagine, how is the last bullet point (6) supposed to work together with the first one (1) they are final and immu...

In the specification of value classes, it says: A value class can only extend universal traits and cannot be extended itself. A universal trait is a trait that extends Any, only has defs as memb...

I know value class in scala inline the operation at compiler time. maybe like this case class A(i: Int) extends AnyVal { def +(that: A) = A(this.i + that.i) } A(1) + A(2) // After compile it eq...

I've constructed a simple matrix in Excel with some character values and some numeric values (Screenshot of data as set up in Excel). I read it into R using the openxlsx package like so: library(o...

In the documentation about Scala value classes, it is mentioned that there are three cases when a value class needs to actually be allocated an instance: Allocation Summary A value class is a...

Looking at some scala-docs of my libraries, it appeared to me that there is some unwanted noise from value classes. For example: implicit class RichInt(val i: Int) extends AnyVal { def squared = ...

I'm using JavaConverters to go from a Java SortedSet to a Vector. val lines = function.getInstructions.asScala.toVector My getInstructions function returns an ArrayList of java.lang.Long, yet t...

I want to apply scala's value classes to one of my projects because they enable me to enrich certain primitive types without great overhead (I hope) and stay type-safe. object Position { implic...

Scala 2.10 introduces value classes, which you specify by making your class extend AnyVal. There are many restrictions on value classes, but one of their huge advantages is that they allow extensio...