refwrapper.h

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/* This software and supporting documentation are distributed by
 *     Institut Federatif de Recherche 49
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 *     91191 Gif-sur-Yvette cedex
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 *
 * This software is governed by the CeCILL-B license under
 * French law and abiding by the rules of distribution of free software.
 * You can  use, modify and/or redistribute the software under the
 * terms of the CeCILL-B license as circulated by CEA, CNRS
 * and INRIA at the following URL "http://www.cecill.info".
 *
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 * economic rights,  and the successive licensors  have only  limited
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 */
 
 
#ifndef CARTOBASE_SMART_REFWRAPPER_H
#define CARTOBASE_SMART_REFWRAPPER_H
 
namespace carto {
 
  template <typename T>
  class reference_wrapper
  {
    public:
      typedef T type;
      reference_wrapper( type & ref ): _object(&ref)
      {}
      reference_wrapper( const reference_wrapper<type> & x ): _object(x._object)
      {}
      ~reference_wrapper()
      {};
      reference_wrapper<type>& operator= ( const reference_wrapper<type> & x )
      {
        if(this != &x) {
          _object = x._object;
        }
        return *this;
      }
      type& get() const { return *_object; }
      operator type&() const { return get(); }
    protected:
      type* _object;
  };
 
  namespace wrap {
    template <typename T>
    reference_wrapper<T> ref( T & ref )
    {
      return reference_wrapper<T>( ref );
    }
 
    template <typename T>
    reference_wrapper<T> ref( reference_wrapper<T> & other )
    {
      return reference_wrapper<T>( other );
    }
 
    template <typename T>
    reference_wrapper<const T> cref( const T & ref )
    {
      return reference_wrapper<const T>( ref );
    }
 
    template <typename T>
    reference_wrapper<const T> cref( reference_wrapper<const T> & other )
    {
      return reference_wrapper<const T>( other );
    }
  }// namespace wrap
 
}// namespace carto
 
#endif