advxml.data.Predicate.scala Maven / Gradle / Ivy

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package advxml.data

object Predicate {

  /** Always true predicate.
    */
  lazy val alwaysTrue: Any => Boolean = _ => true

  /** Always false predicate.
    */
  lazy val alwaysFalse: Any => Boolean = _ => false

  /** Combine two predicates(`T => Boolean`) with `And` operator.
    *
    * @param p1
    *   First predicate
    * @param p2
    *   Second predicate
    * @tparam T
    *   Subject type of predicates
    * @return
    *   Result of combination of `p1` and `p2` using `And` operator.
    */
  def and[T](p1: T => Boolean, p2: T => Boolean): T => Boolean = t => p1(t) && p2(t)

  /** Combine two predicates(`T => Boolean`) with `Or` operator.
    *
    * @param p1
    *   First predicate
    * @param p2
    *   Second predicate
    * @tparam T
    *   Subject type of predicates
    * @return
    *   Result of combination of `p1` and `p2` using `Or` operator.
    */
  def or[T](p1: T => Boolean, p2: T => Boolean): T => Boolean = t => p1(t) || p2(t)
}