• Home
• com.wellfactored
• value-wrapper_2.11
• 1.2.2
• source code
• ValueWrapper.scala

×

Project download

Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $

You can buy this project and download/modify it how often you want.

com.wellfactored.valuewrapper.ValueWrapper.scala Maven / Gradle / Ivy

package com.wellfactored.valuewrapper

/**
  * `ValueWrapper` is a typeclass that abstracts the creation of a class that
  * wraps a single value of another type, as well as the action of extracting
  * the wrapped value from the wrapper. For example, for a single-member case class
  * the `wrap` method would use the companion object `apply` method to construct
  * an instance and the accessor for the member to extract the wrapped value.
  *
  * @tparam W the type of the wrapper
  * @tparam V the type of the wrapped value
  */
trait ValueWrapper[W, V] {
  /**
    * Attempt to wrap the value `v` in an instance of type 'W' and return it as a `Right`.
    * If `v` is somehow inappropriate to be wrapped then return an error message in
    * a `Left`
    */
  def wrap(v: V): Either[String, W]

  /**
    * Extract and return the value of type `V` from the instance of `W`
    */
  def unwrap(w: W): V
}