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• Quantifiable.scala

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validation.Quantifiable.scala Maven / Gradle / Ivy

package ltbs.uniform
package validation

import scala.language.implicitConversions

/** A type that has elements that can be counted 
  * 
  * {{{
  * Set(1,2,3).qty
  * "test".qty
  * }}}
  */
@simulacrum.typeclass trait Quantifiable[A] {

  /** Returns the cardinality (number of elements) */
  def qty(in: A): Int
}

trait QuantifiableInstances {
  def instance[A](f: A => Int) = new Quantifiable[A] {
    def qty(in: A): Int = f(in)
  }

  implicit val quantString = instance[String](x => x.length)  
}