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:
#ifndef DUNE_SINGLETON_HH
#define DUNE_SINGLETON_HH
 
#include <memory>
 
#include <dune/common/visibility.hh>
 
namespace Dune
{
  template<class T>
  class Singleton
  {
  protected:
    /* @brief Private constructor. */
    Singleton(){}
    Singleton(const Singleton&){}
    Singleton& operator=(const Singleton&){}
 
  public:
    DUNE_EXPORT static T& instance()
    {
      /* Smartpointer to the instance. */
      static std::unique_ptr<T> instance_;
      if(instance_.get() == 0)
        instance_ = std::unique_ptr<T>(new T());
      return *instance_;
    }
  };
 
} // namespace Dune
 
#endif