accessors.h

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#ifndef TIL_ACCESSORS_H_
#define TIL_ACCESSORS_H_



namespace til { 
namespace xsr
{
  
  //-------------------------------------------------------------------------------------
  
    //------------------//
   //  Integer_access  //
  //------------------//

  // TODO: add requirement that TCollection is random-access.
  template < typename TCollection, typename TIndex = std::size_t >
  class Integer_access
  {
  public: // typedefs
    typedef TIndex                                    index_type;
    typedef typename TCollection::value_type          value_type;
    typedef typename TCollection::reference           reference;
    typedef typename TCollection::const_reference     const_reference;

  public: // constructors
  
    // NB: Actually, it can be quite comfortable to have it non explicit. We can pass collections rather
    // than constructing explicitely an accessor.
    Integer_access(TCollection & data) : m_data(data) {}
    
  public: // operators
    reference operator()(index_type i) { return m_data[i]; }
    const_reference operator()(index_type i) const { return m_data[i]; }
  private: // data
    TCollection & m_data;
  };
  
  //-------------------------------------------------------------------------------------
    
  /*
  template < typename TReference, typename TValueType = naked_type<TReference>::type >
  struct GetVertexField
  {
    typedef TValueType    value_type;
    typedef TReference    reference;
    template < typename TIterator >
    static TResult get(TIterator i) { return i->vertex(); }
  };
  */
 
 
  //-------------------------------------------------------------------------------------

    //-------------------//
   //  Iterator_access  //
  //-------------------//
 
  template < typename TIterator > //, typename Getter >
  struct Iterator_access
  {
  public: // typedefs
    typedef typename TIterator::value_type  value_type;
    typedef TIterator                       index_type;
  public: // static accessors
    value_type & operator()(index_type i) const
    { return *i; }
  };

  
}} // namespace til::xsr

#endif /*ACCESSORS_H_*/