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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: ScalarFunctionXor.hpp,v 1.3 2006/10/28 12:26:54 delpinux Exp $
#ifndef SCALAR_FUNCTION_XOR_HPP
#define SCALAR_FUNCTION_XOR_HPP
#include <ScalarFunctionBase.hpp>
/**
* @file ScalarFunctionXor.hpp
* @author Stephane Del Pino
* @date Thu Jul 20 11:41:35 2006
*
* @brief returns 1 if only one of two function is not 0, 0 else
*
*/
class ScalarFunctionXor
: public ScalarFunctionBase
{
private:
ConstReferenceCounting<ScalarFunctionBase>
__f; /**< first operand @f$ f @f$ */
ConstReferenceCounting<ScalarFunctionBase>
__g; /**< second operand @f$ g @f$ */
/**
* Writes the function to a stream
*
* @param os output stream
*
* @return os
*/
std::ostream& __put(std::ostream& os) const
{
os << '(' << *__f << " xor " << *__g << ')';
return os;
}
public:
/**
* Evaluates the function
*
* @param X position of evalueation
*
* @return @f$ (f(X)\ne 0)\mbox{ or } (g(X)\ne 0) @f$
*/
real_t operator()(const TinyVector<3,real_t>& X) const
{
const bool f = ((*__f)(X) != 0);
const bool g = ((*__g)(X) != 0);
return f xor g;
}
/**
* Checks if the function can be simplified
*
* @return false
*/
bool canBeSimplified() const
{
return false;
}
/**
* Constructor
*
* @param f first operand @f$ f @f$
* @param g second operand @f$ g @f$
*/
ScalarFunctionXor(ConstReferenceCounting<ScalarFunctionBase> f,
ConstReferenceCounting<ScalarFunctionBase> g)
: ScalarFunctionBase(ScalarFunctionBase::xor_),
__f(f),
__g(g)
{
;
}
/**
* Copy constructor
*
* @param f given function
*/
ScalarFunctionXor(const ScalarFunctionXor& f)
: ScalarFunctionBase(f),
__f(f.__f),
__g(f.__g)
{
;
}
/**
* Destructor
*
*/
~ScalarFunctionXor()
{
;
}
};
#endif // SCALAR_FUNCTION_XOR_HPP
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