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PDF renderer implementation supporting the subset of PDF 1.4 specification.

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package org.openpdf.renderer.function.postscript.operation;

import java.util.Stack;

final class Dup implements PostScriptOperation {
	@Override
	/**
	 * any dup any any 
	 *
	 * duplicates the top element on the operand stack.
	 * dup copies only the object; the value of a composite
	 * object is not copied but is shared.
	 * See Section 3.3, "Data Types and Objects." 

	 *
	 * errors: stackoverflow, stackunderflow
	 */
	public void eval(Stack