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#ifndef OPENTISSUE_UTILITY_UTILITY_TAG_TRAITS_H
#define OPENTISSUE_UTILITY_UTILITY_TAG_TRAITS_H
//
// OpenTissue Template Library
// - A generic toolbox for physics-based modeling and simulation.
// Copyright (C) 2008 Department of Computer Science, University of Copenhagen.
//
// OTTL is licensed under zlib: http://opensource.org/licenses/zlib-license.php
//

#include <boost/utility.hpp>

namespace OpenTissue
{
  namespace utility
  {

    template <typename T> 
    struct TagSupportedType
    {
      typedef void has_tag;   
      typedef T tag_type;     
      tag_type m_tag;         
    };
    typedef TagSupportedType<int> default_tag_supported_type;

    template <class T, class Enable = void>
    struct tag_traits { static bool const has_tag = false; typedef int tag_type; };

    template <class T>
    struct tag_traits<T, typename T::has_tag > { static bool const has_tag = true; typedef typename T::tag_type tag_type; };

    template <class T>
    inline bool has_tag(T const & obj, typename boost::disable_if_c< tag_traits<T>::has_tag >::type * dummy = 0) 
    { return false; }
    template <class T>
    inline bool has_tag(T const & obj, typename boost::enable_if_c< tag_traits<T>::has_tag >::type * dummy = 0) 
    { return true; }

    template <typename T>
    inline typename tag_traits<T>::tag_type tag_value(T const & obj, typename boost::disable_if_c< tag_traits<T>::has_tag >::type * dummy = 0) 
    { return 0; }
    template <typename T>
    inline typename tag_traits<T>::tag_type tag_value(T const & obj, typename boost::enable_if_c< tag_traits<T>::has_tag >::type * dummy = 0) 
    { return obj.m_tag; }

    template <class T>
    inline void set_tag(T & /* obj */, typename tag_traits<T>::tag_type const & /* tag */, typename boost::disable_if_c< tag_traits<T>::has_tag >::type * dummy = 0) 
    { }
    template <class T>
    inline void set_tag(T & obj, typename tag_traits<T>::tag_type const & tag, typename boost::enable_if_c< tag_traits<T>::has_tag >::type * dummy = 0) 
    { obj.m_tag = tag; }

  } //namespace utility

} //namespace OpenTissue

// OPENTISSUE_UTILITY_UTILITY_TAG_TRAITS_H
#endif