/usr/include/dolfin/la/uBLASPreconditioner.h is in libdolfin-dev 1.4.0+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Modified by Anders Logg 2006-2011
//
// First added: 2006-06-23
// Last changed: 2011-11-11
#ifndef __UBLAS_PRECONDITIONER_H
#define __UBLAS_PRECONDITIONER_H
#include <dolfin/log/log.h>
namespace dolfin
{
class uBLASVector;
class uBLASLinearOperator;
template<typename Mat> class uBLASMatrix;
/// This class specifies the interface for preconditioners for the
/// uBLAS Krylov solver.
class uBLASPreconditioner
{
public:
/// Constructor
uBLASPreconditioner() {}
/// Destructor
virtual ~uBLASPreconditioner() {}
/// Initialise preconditioner (sparse matrix)
virtual void init(const uBLASMatrix<ublas_sparse_matrix>& P)
{
dolfin_error("uBLASPreconditioner",
"initialize uBLAS preconditioner",
"No init() function for preconditioner uBLASMatrix<ublas_sparse_matrix>");
}
/// Initialise preconditioner (dense matrix)
virtual void init(const uBLASMatrix<ublas_dense_matrix>& P)
{
dolfin_error("uBLASPreconditioner",
"initialize uBLAS preconditioner",
"No init() function for preconditioner uBLASMatrix<ublas_dense_matrix>");
}
/// Initialise preconditioner (virtual matrix)
virtual void init(const uBLASLinearOperator& P)
{
dolfin_error("uBLASPreconditioner",
"initialize uBLAS preconditioner",
"No init() function for preconditioner uBLASLinearOperator");
}
/// Solve linear system (M^-1)Ax = y
virtual void solve(uBLASVector& x, const uBLASVector& b) const = 0;
};
}
#endif
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