system_subset_by_subdomain.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
 
// This library 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 2.1 of the License, or (at your option) any later version.
 
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 
 
#ifndef LIBMESH_SYSTEM_SUBSET_BY_SUBDOMAIN_H
#define LIBMESH_SYSTEM_SUBSET_BY_SUBDOMAIN_H
 
// Local Includes
#include "libmesh/system_subset.h"
#include "libmesh/id_types.h"
#include "libmesh/parallel_object.h"
 
// C++ includes
#include <cstddef>
#include <set>
 
namespace libMesh
{
 
// Forward Declarations
 
class SystemSubsetBySubdomain : public SystemSubset,
                                public ParallelObject
{
public:
 
  class SubdomainSelection : public ReferenceCountedObject<SubdomainSelection>
  {
  public:
 
    SubdomainSelection ();
 
    virtual ~SubdomainSelection ();
 
    virtual bool operator() (const subdomain_id_type & subdomain_id) const = 0;
 
  private:
    SubdomainSelection (const SubdomainSelection &);
 
    SubdomainSelection & operator = (const SubdomainSelection &);
  }; // subclass \p SubdomainSelection
 
 
 
  class SubdomainSelectionByList : public SubdomainSelection
  {
  public:
    explicit
    SubdomainSelectionByList (const std::set<subdomain_id_type> & list);
 
    virtual bool operator() (const subdomain_id_type & subdomain_id) const override;
 
  protected:
    const std::set<subdomain_id_type> & _list;
  };
 
  SystemSubsetBySubdomain (const System & system,
                           const SubdomainSelection & subdomain_selection,
                           const std::set<unsigned int> * const var_nums = nullptr);
 
  SystemSubsetBySubdomain (const System & system,
                           const std::set<subdomain_id_type> & subdomain_ids,
                           const std::set<unsigned int> * const var_nums = nullptr);
 
  virtual ~SystemSubsetBySubdomain ();
 
  virtual const std::vector<unsigned int> & dof_ids () const override;
 
  void init (const SubdomainSelection & subdomain_selection);
 
  void init (const std::set<subdomain_id_type> & subdomain_ids);
 
protected:
 
  void set_var_nums (const std::set<unsigned int> * const var_nums);
 
  std::set<unsigned int> _var_nums;
 
  std::vector<unsigned int> _dof_ids;
 
}; // class SystemSubset
 
} // namespace libMesh
 
#endif // LIBMESH_SYSTEM_SUBSET_BY_SUBDOMAIN_H