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/*		 
 * Copyright (C) 2002-2015 Sebastiano Vigna
 *
 * 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 PACKAGE;

import java.util.Iterator;

/** A type-specific {@link Iterator}; provides an additional method to avoid (un)boxing, and
 * the possibility to skip elements.
 *
 * @see Iterator
 */

public interface KEY_ITERATOR KEY_GENERIC extends Iterator {


#if #keys(primitive)

	/**
	 * Returns the next element as a primitive type.
	 *
	 * @return the next element in the iteration.
	 * @see Iterator#next()
	 */

	KEY_TYPE NEXT_KEY();

#endif


	/** Skips the given number of elements.
	 *
	 * The effect of this call is exactly the same as that of
	 * calling {@link #next()} for n times (possibly stopping
	 * if {@link #hasNext()} becomes false).
	 *
	 * @param n the number of elements to skip.
	 * @return the number of elements actually skipped.
	 * @see Iterator#next()
	 */

	int skip( int n );
}