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/*
 * Copyright 2015 Google Inc.
 *
 * 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 java.util.function;

import static javaemul.internal.InternalPreconditions.checkCriticalNotNull;

/**
 * See 
 * the official Java API doc for details.
 */
@FunctionalInterface
public interface LongUnaryOperator {

  static LongUnaryOperator identity() {
    return operand -> operand;
  }

  long applyAsLong(long operand);

  default LongUnaryOperator andThen(LongUnaryOperator after) {
    checkCriticalNotNull(after);
    return operand -> after.applyAsLong(applyAsLong(operand));
  }

  default LongUnaryOperator compose(LongUnaryOperator before) {
    checkCriticalNotNull(before);
    return operand -> applyAsLong(before.applyAsLong(operand));
  }
}




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