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// Part of NoException: https://noexception.machinezoo.com
package com.machinezoo.noexception.throwing;

import java.util.function.*;
import com.machinezoo.noexception.*;

/**
 * Variation of {@link DoubleUnaryOperator} that allows throwing checked exceptions.
 * {@code ThrowingDoubleUnaryOperator} is usually implemented by a lambda
 * and passed to {@link CheckedExceptionHandler#fromDoubleUnaryOperator(ThrowingDoubleUnaryOperator)}.
 * See noexception tutorial.
 * 
 * @see CheckedExceptionHandler#fromDoubleUnaryOperator(ThrowingDoubleUnaryOperator)
 * @see DoubleUnaryOperator
 */
@FunctionalInterface public interface ThrowingDoubleUnaryOperator {
	/**
	 * Variation of {@link DoubleUnaryOperator#applyAsDouble(double)} that allows throwing checked exceptions.
	 * 
	 * @param operand
	 *            see {@link DoubleUnaryOperator#applyAsDouble(double)}
	 * @return see {@link DoubleUnaryOperator#applyAsDouble(double)}
	 * @throws Exception
	 *             if unable to complete
	 * @see CheckedExceptionHandler#fromDoubleUnaryOperator(ThrowingDoubleUnaryOperator)
	 * @see DoubleUnaryOperator#applyAsDouble(double)
	 */
	double applyAsDouble(double operand) throws Exception;
}