<commit_before>//******************************************************************************
// FILE : function_variable.hpp
//
// LAST MODIFIED : 23 January 2005
//
// DESCRIPTION :
// An abstract class for specifying input/independent and output/dependent
// variables of a function.
//
// Function_variables can be evaluated, differentiated or set to another value.
//==============================================================================
#if !defined (__FUNCTION_VARIABLE_HPP__)
#define __FUNCTION_VARIABLE_HPP__

#include <iterator>
#include <list>

#include "computed_variable/function_base.hpp"
#include "computed_variable/function_variable_value.hpp"

//#define USE_FUNCTION_VARIABLE__EVALUATE_DERIVATIVE

class Function_variable_iterator_representation
//******************************************************************************
// LAST MODIFIED : 2 March 2004
//
// DESCRIPTION :
//
// NOTES:
// To get iterators for a sub-class of Function_variable, derive a represenation
// class from this one.
//==============================================================================
{
	friend class Function_variable_iterator;
	public:
		// a "virtual" constructor
		virtual Function_variable_iterator_representation *clone()=0;
	protected:
		// destructor.  Virtual for proper destruction of derived classes
		virtual ~Function_variable_iterator_representation();
	private:
		// increment.  Do not want to return an object derived from
		//   Function_variable_iterator_representation.  Used by
		//   Function_variable_iterator::operator++() and ++(int)<commit_msg>Changed back to USE_FUNCTION_VARIABLE__EVALUATE_DERIVATIVE<commit_after>//******************************************************************************
// FILE : function_variable.hpp
//
// LAST MODIFIED : 23 January 2005
//
// DESCRIPTION :
// An abstract class for specifying input/independent and output/dependent
// variables of a function.
//
// Function_variables can be evaluated, differentiated or set to another value.
//==============================================================================
#if !defined (__FUNCTION_VARIABLE_HPP__)
#define __FUNCTION_VARIABLE_HPP__

#include <iterator>
#include <list>

#include "computed_variable/function_base.hpp"
#include "computed_variable/function_variable_value.hpp"

#define USE_FUNCTION_VARIABLE__EVALUATE_DERIVATIVE

class Function_variable_iterator_representation
//******************************************************************************
// LAST MODIFIED : 2 March 2004
//
// DESCRIPTION :
//
// NOTES:
// To get iterators for a sub-class of Function_variable, derive a represenation
// class from this one.
//==============================================================================
{
	friend class Function_variable_iterator;
	public:
		// a "virtual" constructor
		virtual Function_variable_iterator_representation *clone()=0;
	protected:
		// destructor.  Virtual for proper destruction of derived classes
		virtual ~Function_variable_iterator_representation();
	private:
		// increment.  Do not want to return an object derived from
		//   Function_variable_iterator_representation.  Used by
		//   Function_variable_iterator::operator++() and ++(int)
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