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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: MassOperator.hpp,v 1.6 2004/08/28 08:28:03 delpinux Exp $
#ifndef _MASSOPERATOR_
#define _MASSOPERATOR_
#include <PDEOperator.hpp>
/*!
\class MassOperator
The class MassOperator describes partial differencial operators of order
0: \f$ \alpha\cdot \f$ where \f$ \alpha \f$ where
\f$
\begin{array}{ll}
\alpha: &\Omega \to R \\
&x \mapsto \mu(x)
\end{array}
\f$.
\par example:
if \f$ \alpha = 1 \f$, the operator is the identity.
\author Stphane Del Pino
*/
class MassOperator
: public PDEOperator
{
private:
//! The function \f$ \alpha \f$.
ReferenceCounting<UserFunction> __Alpha;
public:
const UserFunction& coefficient(const size_t i)
{
assert (i<1);
return (*__Alpha);
}
std::string TypeName() const
{
return std::string("MassOperator");
}
//! Access to the function \f$ \alpha \f$.
ReferenceCounting<UserFunction> alpha()
{
return __Alpha;
}
//! Read-only access to the function \f$ \alpha \f$.
const UserFunction& alpha() const
{
return *__Alpha;
}
//! Returns a pointer on the opposed MassOperator operator.
ReferenceCounting<PDEOperator> operator * (ConstReferenceCounting<UserFunction> u) const
{
ReferenceCounting<UserFunction> alpha
= new MulUserFunction(__Alpha, u);
return (new MassOperator(alpha));
}
//! Returns a pointer on the opposed MassOperator operator.
ReferenceCounting<PDEOperator> operator - () const
{
ReferenceCounting<UserFunction> alpha
= new UnaryMinusUserFunction(__Alpha);
return (new MassOperator(alpha));
}
// Constructs the operator using a \a Mesh and a function \a initAlpha.
MassOperator(ReferenceCounting<UserFunction> initAlpha)
: PDEOperator(PDEOperator::massop,
1),
__Alpha(initAlpha)
{
;
}
//! Copy constructor.
MassOperator(const MassOperator& M)
: PDEOperator(M),
__Alpha(M.__Alpha)
{
;
}
//! Destrutor.
~MassOperator()
{
;
}
};
#endif // _MASSOPERATOR_
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