/usr/include/dolfin/fem/PointSource.h is in libdolfin1.0-dev 1.0.0-1.
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) 2011 Anders Logg
//
// 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/>.
//
// First added: 2011-04-13
// Last changed: 2011-04-13
#include <boost/shared_ptr.hpp>
#include <dolfin/mesh/Point.h>
namespace dolfin
{
// Forward declarations
class FunctionSpace;
class GenericVector;
/// This class provides an easy mechanism for adding a point source
/// (Dirac delta function) to the right-hand side vector in a
/// variational problem. The associated function space must be
/// scalar in order for the inner product with the (scalar) Dirac
/// delta function to be well defined.
class PointSource
{
public:
/// Create point source at given point of given magnitude
PointSource(const FunctionSpace& V,
const Point& p,
double magnitude=1.0);
/// Create point source at given point of given magnitude
PointSource(boost::shared_ptr<const FunctionSpace> V,
const Point& p,
double magnitude=1.0);
/// Destructor
~PointSource();
/// Apply (add) point source to right-hand side vector
void apply(GenericVector& b);
private:
// Check that function space is scalar
void check_is_scalar(const FunctionSpace& V);
// The function space
boost::shared_ptr<const FunctionSpace> V;
// The point
Point p;
// Magnitude
double magnitude;
};
}
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