/* * 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 ops import hlist.Length object product { trait ProductLength[T] extends DepFn1[T] object ProductLength { type Aux[T, Out0] = ProductLength[T] { type Out = Out0 } implicit def length[T, L <: HList] (implicit gen: Generic.Aux[T, L], length: Length[L]): Aux[T, length.Out] = new ProductLength[T] { type Out = length.Out def apply(t: T): Out = length() } } }