singleton.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_SINGLETON_HH
#define DUNE_SINGLETON_HH
 
#include <dune/common/visibility.hh>
 
namespace Dune
{
  template<class T>
  class Singleton
  {
  protected:
    /* @brief Protected constructor. */
    Singleton() = default;
 
  public:
 
    Singleton(const Singleton&) = delete;
    void operator=(const Singleton&) = delete;
 
    DUNE_EXPORT static T& instance()
    {
      static T instance_;
      return instance_;
    }
  };
 
} // namespace Dune
 
#endif