com.avsystem.commons.misc.ValueOf.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of commons-core_2.13 Show documentation

AVSystem commons library for Scala

There is a newer version: 2.22.0

package com.avsystem.commons
package misc

import com.avsystem.commons.macros.misc.MiscMacros

import scala.annotation.implicitNotFound

/**
  * Macro materialized typeclass which captures the single value of a singleton type.
  */
@implicitNotFound("Cannot derive value of ${T} - is not a singleton type")
class ValueOf[T](val value: T) extends AnyVal
object ValueOf {
  def apply[T](implicit vof: ValueOf[T]): T = vof.value

  implicit def mkValueOf[T]: ValueOf[T] = macro MiscMacros.mkValueOf[T]
}