/usr/include/dolfin/fem/Equation.h is in libdolfin-dev 2016.2.0-2.
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/>.
//
// First added: 2011-06-21
// Last changed: 2011-06-22
#ifndef __EQUATION_H
#define __EQUATION_H
#include <memory>
namespace dolfin
{
// Forward declarations
class Form;
/// This class represents a variational equation lhs == rhs.
/// The equation can be either linear or nonlinear:
///
/// 1. Linear (a == L), in which case a must be a bilinear form
/// and L must be a linear form.
///
/// 2. Nonlinear (F == 0), in which case F must be a linear form.
class Equation
{
public:
/// Create equation a == L
Equation(std::shared_ptr<const Form> a,
std::shared_ptr<const Form> L);
/// Create equation F == 0
Equation(std::shared_ptr<const Form> F, int rhs);
/// Destructor
~Equation();
/// Check whether equation is linear
bool is_linear() const;
/// Return form for left-hand side
std::shared_ptr<const Form> lhs() const;
/// Return form for right-hand side
std::shared_ptr<const Form> rhs() const;
/// Return value for right-hand side
int rhs_int() const;
private:
// Left-hand side form
std::shared_ptr<const Form> _lhs;
// Right-hand side form
std::shared_ptr<const Form> _rhs;
// Right-hand side value (should be zero)
int _rhs_int;
// Flag for whether equation is linear
bool _is_linear;
};
}
#endif
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