libmesh_singleton.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2023 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_LIBMESH_SINGLETON_H
#define LIBMESH_LIBMESH_SINGLETON_H

#include "libmesh/libmesh_common.h"

namespace libMesh
{

class Singleton
{
protected:

  Singleton();

  virtual ~Singleton() = default;

public:

  class Setup
  {
  protected:
    Setup ();

  public:
    virtual ~Setup() = default;

    virtual void setup () = 0;
  };

  static void setup();

  static void cleanup();
};

} // namespace libMesh

#endif // LIBMESH_LIBMESH_SINGLETON_H