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Math functions for BigDecimal.

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package ch.obermuhlner.math.big.internal;

import java.math.BigDecimal;

/**
 * Iterator over the powers of a value x.
 * 
 * This API allows to efficiently calculate the various powers of x in a taylor series by storing intermediate results.
 * For example xⁿ can be calculated using one multiplication by storing the previously calculated x^n-1 and x.
 * 
 * {@link #getCurrentPower()} will be called first to retrieve the initial value.
 * 
 * For later iterations {@link #calculateNextPower()} will be called before {@link #getCurrentPower()}.
 */
public interface PowerIterator {
	
	/**
	 * Returns the current power.
	 * 
	 * @return the current power.
	 */
	BigDecimal getCurrentPower();
	
	/**
	 * Calculates the next power.
	 */
	void calculateNextPower();
}