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/*
 * Copyright (c) 2013 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
package syntax
package std

/**
 * Conversions between ordinary functions and `HList` functions.
 * 
 * The implicits defined by this object enhance ordinary functions (resp. HList functions) with a `toProduct` (resp.
 * `fromProduct`) method which creates an equivalently typed `HList` function (resp. ordinary function).
 * 
 * @author Miles Sabin
 */
object function {
  import ops.function._

  implicit def fnHListOps[F, T <: HList, R](t: F)(implicit fnHLister: FnToProduct.Aux[F, T => R]) = new FnHListOps[T => R] {
    def toProduct = fnHLister(t)
  }


  implicit def fnUnHListOps[F](t : F)(implicit fnUnHLister : FnFromProduct[F]) = new FnUnHListOps[fnUnHLister.Out] {
    def fromProduct = fnUnHLister(t)
  }
}

trait FnHListOps[HLFn] {
  def toProduct: HLFn
}

trait FnUnHListOps[F] {
  def fromProduct : F
}