///
/// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
///
/// Rheolef 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 of the License, or
/// (at your option) any later version.
///
/// Rheolef 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 Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
/// 
/// =========================================================================
//! @examplefile poisson_robin.icc The Poisson problem with Robin boundary condition -- solver function
field poisson_robin (Float Cf, const geo& boundary, const field& lh) {
  const space& Xh = lh.get_space();
  trial u (Xh); test  v (Xh);
  form a = integrate(dot(grad(u),grad(v))) + Cf*integrate(boundary, u*v);
  field uh (Xh);
  problem p (a);
  p.solve (lh, uh);
  return uh;
}
