io.kindedj.Hk Maven / Gradle / Ivy

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/*
 * Copyright (c) KindedJ 2017
 *
 * 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 io.kindedj;

/**
 * Hk, or higher kind, represents a parametrized type of a class/interface. It would be equivalent to F<A> if Java had support for higher kinds.
 * 


 * To construct higher kinds of arity 2+ you have to nest Hk into its witness type parameter.
 * For example, to represent F<G, H, A> you have to implement an interface or type alias Hk<Hk<Hk<F, G>, H>, A>
 *
 * @param  The witness type of the parametrized class/interface to be lifted as a type constructor
 * @param  The type parameter applied to the type constructor witnessed by <F>
 */
public interface Hk {
}