it.unimi.dsi.fastutil.doubles.DoubleBidirectionalIterator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of fastutil Show documentation

fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.

There is a newer version: 8.5.15

Show newest version

/*
	* Copyright (C) 2002-2017 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 it.unimi.dsi.fastutil.doubles;
import it.unimi.dsi.fastutil.BidirectionalIterator;
import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;
/**
 * A type-specific bidirectional iterator; provides an additional method to
 * avoid (un)boxing, and the possibility to skip elements backwards.
 *
 * @see BidirectionalIterator
 */
public interface DoubleBidirectionalIterator extends DoubleIterator, ObjectBidirectionalIterator {
	/**
	 * Returns the previous element as a primitive type.
	 *
	 * @return the previous element in the iteration.
	 * @see java.util.ListIterator#previous()
	 */
	double previousDouble();
	/**
	 * {@inheritDoc}
	 * 
	 * @deprecated Please use the corresponding type-specific method instead.
	 */
	@Deprecated
	@Override
	default Double previous() {
		return Double.valueOf(previousDouble());
	}
	/**
	 * Moves back for the given number of elements.
	 *
	 * 
	 * The effect of this call is exactly the same as that of calling
	 * {@link #previous()} for {@code n} times (possibly stopping if
	 * {@link #hasPrevious()} becomes false).
	 *
	 * @param n
	 *            the number of elements to skip back.
	 * @return the number of elements actually skipped.
	 * @see #previous()
	 */
	@Override
	default int back(final int n) {
		int i = n;
		while (i-- != 0 && hasPrevious())
			previousDouble();
		return n - i - 1;
	}
	/** {@inheritDoc} */
	@Override
	default int skip(final int n) {
		return DoubleIterator.super.skip(n);
	}
}