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// $Id: local_integrator.h 30040 2013-07-18 17:06:48Z maier $
//
// Copyright (C) 2006 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__mesh_worker_local_integrator_h
#define __deal2__mesh_worker_local_integrator_h
#include <deal.II/base/config.h>
#include <deal.II/base/subscriptor.h>
#include <deal.II/base/std_cxx1x/function.h>
DEAL_II_NAMESPACE_OPEN
namespace MeshWorker
{
template <int dim, int spacedim, typename number> class DoFInfo;
template <int dim, int spacedim> class IntegrationInfo;
/**
* A local integrator object, which can be used to simplify the call
* of loop(). Instead of providing the three local integration
* functions separately, we bundle them as virtual functions in this
* class.
*
* Additionally, since we cannot have a virtual null function, we
* provide flags, which allow us to indicate, whether we want to
* integrate on boundary and interior faces. Thes flags are true by
* default, but can be modified by applications to speed up the loop.
*
* If a function is not overloaded in a derived class, but its usage
* flag is true, the function will cause an exception
* ExcPureFunction.
*
* @ingroup MeshWorker
* @author Guido Kanschat
* @date 2012
*/
template <int dim, int spacedim=dim, typename number=double>
class LocalIntegrator : public Subscriptor
{
public:
/**
* The constructor setting default values, namely all integration flags to true.
*/
LocalIntegrator();
/**
* The constructor setting integration flags to specified values.
*/
LocalIntegrator(bool use_cell, bool use_boundary, bool use_face);
/**
* The empty virtual destructor.
*/
~LocalIntegrator();
/**
* Virtual function for integrating on cells. Throws exception
* PureFunctionCalled if not overloaded by a derived class.
*/
virtual void cell(DoFInfo<dim, spacedim, number> &dinfo,
IntegrationInfo<dim, spacedim> &info) const;
/**
* Virtual function for integrating on boundary faces. Throws exception
* PureFunctionCalled if not overloaded by a derived class.
*/
virtual void boundary(DoFInfo<dim, spacedim, number> &dinfo,
IntegrationInfo<dim, spacedim> &info) const;
/**
* Virtual function for integrating on interior faces. Throws exception
* PureFunctionCalled if not overloaded by a derived class.
*/
virtual void face(DoFInfo<dim, spacedim, number> &dinfo1,
DoFInfo<dim, spacedim, number> &dinfo2,
IntegrationInfo<dim, spacedim> &info1,
IntegrationInfo<dim, spacedim> &info2) const;
/**
* The flag indicating whether the cell integrator cell() is to be
* used in the loop. Defaults to <tt>true</tt>.
*/
bool use_cell;
/**
* The flag indicating whether the boundary integrator boundary()
* is to be used in the loop. Defaults to <tt>true</tt>.
*/
bool use_boundary;
/**
* The flag indicating whether the interior face integrator face()
* is to be used in the loop. Defaults to <tt>true</tt>.
*/
bool use_face;
/**
* This error is thrown if one of the virtual functions cell(),
* boundary(), or face() is called without being overloaded in a
* derived class. Consider setting #use_cell, #use_boundary, and
* #use_face to false, respectively.
*
* @ingroup Exceptions
*/
DeclException0(ExcPureFunction);
};
}
DEAL_II_NAMESPACE_CLOSE
#endif
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