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hlists.scala
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hlists.scala
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/*
* Copyright (c) 2011-13 Miles Sabin
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package shapeless
import scala.annotation.tailrec
/**
* `HList` ADT base trait.
*
* @author Miles Sabin
*/
sealed trait HList
/**
* Non-empty `HList` element type.
*
* @author Miles Sabin
*/
final case class ::[+H, +T <: HList](head : H, tail : T) extends HList {
override def toString = head+" :: "+tail.toString
}
/**
* Empty `HList` element type.
*
* @author Miles Sabin
*/
sealed trait HNil extends HList {
def ::[H](h : H) = shapeless.::(h, this)
override def toString = "HNil"
}
/**
* Empty `HList` value.
*
* @author Miles Sabin
*/
case object HNil extends HNil
object HList {
import syntax.HListOps
def apply() = HNil
def apply[P <: Product, L <: HList](p : P)(implicit gen: Generic.Aux[P, L]) : L = gen.to(p)
implicit def hlistOps[L <: HList](l : L) : HListOps[L] = new HListOps(l)
/**
* Convenience aliases for HList :: and List :: allowing them to be used together within match expressions.
*/
object ListCompat {
val :: = scala.collection.immutable.::
val #: = shapeless.::
}
}