wrapper_iterator.H

#line 5097 "grafos.nw"
# ifndef WRAPPER_ITERATOR_H
# define WRAPPER_ITERATOR_H

    template <class Container, class It, class Show_Item>
class Wrapper_Iterator : public It
{

private:

  
#line 5175 "grafos.nw"
Container * cont;
#line 5182 "grafos.nw"
void goto_first_valid_item()
{
  try
    { // colocarse en el primer elemento que acepte Show_Item
      for (It::reset_first(); true; It::next())
        if (not It::has_current() or Show_Item () (*cont, It::get_current()))
          return;
    }
  catch (std::overflow_error) { /* se queda en overflow sin propagar */ }
}
void forward()
{
  It::next(); 
  try 
    {     // avanzar hasta el siguiente item que acepte Show_Item
      for (;true; It::next()) 
        if (not It::has_current() or Show_Item () (*cont, It::get_current()))
          return;
    }
  catch (std::overflow_error) { /* se queda en overflow sin propagar */ }
}
#line 5220 "grafos.nw"
void goto_last_valid_item()
{
  for (It::reset_last(); true; It::prev())
    if (not It::has_current() or Show_Item () (*cont, It::get_current()))
      return;
}
void backward()
{
  It::prev();
  try 
    {     
      for (;true; It::prev()) 
        if (not It::has_current() or Show_Item() (*cont, It::get_current()))
          return;
    }
  catch (std::underflow_error) { /* se queda en overflow sin propagar */ }
}

#line 5139 "grafos.nw"
public:

  
#line 5245 "grafos.nw"
typedef typename It::Item_Type Item_Type;
Wrapper_Iterator() : cont(NULL) { /* empty */ }
Wrapper_Iterator(Container & cont) : It(cont), cont(&cont)
{
  goto_first_valid_item();
}
Wrapper_Iterator(const Wrapper_Iterator & it) : It(it), cont(it.cont) { /* empty */ }
Wrapper_Iterator & operator = (const  Wrapper_Iterator & it) 
{
  *((It*) this) = it;
  cont = it.cont;
  return *this;
}
void next() { forward(); }
void prev() { backward(); }
void reset_first() { goto_first_valid_item(); }
void reset_last() { goto_last_valid_item(); }
#line 5142 "grafos.nw"
};


# endif // WRAPPER_ITERATOR_H