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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2001, 2002, 2003 Stphane Del Pino
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// $Id: FunctionExpressionDerivative.hpp,v 1.2 2006/07/23 22:14:19 delpinux Exp $
#ifndef FUNCTION_EXPRESSION_DERIVATIVE_HPP
#define FUNCTION_EXPRESSION_DERIVATIVE_HPP
#include <FunctionExpression.hpp>
#include <ErrorHandler.hpp>
/**
* @file FunctionExpressionDerivative.hpp
* @author Stephane Del Pino
* @date Tue Jul 4 01:43:55 2006
*
* @brief Computes the derivative of a function expression
*
*/
class FunctionExpressionDerivative
: public FunctionExpression
{
public:
enum Direction {
x,
y,
z,
undefined
};
private:
FunctionExpressionDerivative::Direction __direction; /**< direction of derivation */
ReferenceCounting<FunctionExpression> __derivedFunction; /**< function to derive */
/**
* returns @b true if the function to derive has a boundary
*
* @return true if the function to derive has a boundary
*/
bool hasBoundaryExpression() const
{
return __derivedFunction->hasBoundaryExpression();
}
/**
* converts the string direction name to a the type Direction
*
* @param name name of the direction
*
* @return associated enumerate value
*/
static FunctionExpressionDerivative::Direction
getDirection(const std::string& name)
{
if (name == "dx") return x;
if (name == "dy") return y;
if (name == "dz") return z;
throw ErrorHandler(__FILE__,__LINE__,
"unknown derivation direction",
ErrorHandler::unexpected);
return undefined;
}
public:
/**
* Executes the expression
*
*/
void execute();
/**
* Constructor
*
* @param directionName derivation direction
* @param function function to derive
*/
FunctionExpressionDerivative(const std::string& directionName,
ReferenceCounting<FunctionExpression> function);
/**
* Copy constructor
*
* @param f the derivative function expression
*/
FunctionExpressionDerivative(const FunctionExpressionDerivative& f);
/**
* Destructor
*
*/
~FunctionExpressionDerivative();
};
#endif // FUNCTION_EXPRESSION_DERIVATIVE_HPP
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