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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 spark.api.java.function
/**
* A function with no return value.
*/
// This allows Java users to write void methods without having to return Unit.
abstract class VoidFunction[T] extends Serializable {
@throws(classOf[Exception])
def call(t: T) : Unit
}
// VoidFunction cannot extend AbstractFunction1 (because that would force users to explicitly
// return Unit), so it is implicitly converted to a Function1[T, Unit]:
object VoidFunction {
implicit def toFunction[T](f: VoidFunction[T]) : Function1[T, Unit] = ((x : T) => f.call(x))
}
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