/usr/include/dolfin/la/PETScUserPreconditioner.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | // Copyright (C) 2005 Johan Jansson
//
// 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 2005-2006.
// Modified Garth N. Wells 2005
//
// First added: 2005
// Last changed: 2008-01-07
#ifndef __PETSC_USER_PRECONDITIONER_H
#define __PETSC_USER_PRECONDITIONER_H
#ifdef HAS_PETSC
#include <petscksp.h>
#include <petscpc.h>
#include "PETScObject.h"
namespace dolfin
{
class PETScVector;
/// This class specifies the interface for user-defined Krylov
/// method PETScPreconditioners. A user wishing to implement her own
/// PETScPreconditioner needs only supply a function that approximately
/// solves the linear system given a right-hand side.
class PETScUserPreconditioner : public PETScObject
{
public:
/// Constructor
PETScUserPreconditioner();
/// Destructor
virtual ~PETScUserPreconditioner();
static void setup(const KSP ksp, PETScUserPreconditioner& pc);
/// Solve linear system approximately for given right-hand side b
virtual void solve(PETScVector& x, const PETScVector& b) = 0;
protected:
PC petscpc;
private:
static int PCApply(PC pc, Vec x, Vec y);
static int PCCreate(PC pc);
};
}
#endif
#endif
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