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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.

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/*		 
 * Copyright (C) 2002-2016 Sebastiano Vigna
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package it.unimi.dsi.fastutil.doubles;

/**
 * An abstract class facilitating the creation of type-specific iterators.
 *
 * 
 * To create a type-specific iterator you need both a method returning the next
 * element as primitive type and a method returning the next element as an
 * object. However, if you inherit from this class you need just one (anyone).
 *
 * 
 * This class implements also a trivial version of {@link #skip(int)} that uses
 * type-specific methods; moreover, {@link #remove()} will throw an
 * {@link UnsupportedOperationException}.
 *
 * @see java.util.Iterator
 */
public abstract class AbstractDoubleIterator implements DoubleIterator {
	protected AbstractDoubleIterator() {
	}

	/** Delegates to the corresponding generic method. */
	public double nextDouble() {
		return next().doubleValue();
	}

	/**
	 * Delegates to the corresponding type-specific method.
	 * 
	 * @deprecated Please use the corresponding type-specific method instead.
	 */
	@Deprecated
	public Double next() {
		return Double.valueOf(nextDouble());
	}

	/** This method just throws an {@link UnsupportedOperationException}. */
	public void remove() {
		throw new UnsupportedOperationException();
	}

	/**
	 * This method just iterates the type-specific version of {@link #next()}
	 * for at most n times, stopping if {@link #hasNext()} becomes
	 * false.
	 */
	public int skip(final int n) {
		int i = n;
		while (i-- != 0 && hasNext())
			nextDouble();
		return n - i - 1;
	}
}