association.h

用于词法分析的词法分析器

/*
  $Id: Association.h,v 1.2 1997/02/02 01:31:04 matt Exp $

  Associations.

  (c) May 95 Matt Phillips
  */

#ifndef _ASSOC_H
#define _ASSOC_H

#include "ContainerPresentation.h"

template <class K, class T>
class AssociationIter : public ContainerIter<T>
{
public:

  virtual const K &getKey () const = 0;
};

template <class K, class T>
class Association : public ContainerPresentation<T>
{
public:
   
  virtual const char *name () const {return "Association";}
   
  virtual T &add (K &key, T &i) = 0;
  virtual int remove (const K &key) = 0;
  int exists (const K &key) const {return get (key) != 0;}
  virtual T *get (const K &key) const = 0;
  virtual AssociationIter<K, T> *makeIter () const = 0;
  virtual void printTo (ostream &os) const;
};

template <class K, class T>
void Association<K, T>::printTo (ostream &os) const
{
  AssociationIter<K, T> *i;
   
  os << name () << endl;
   
  for (i = makeIter (); *i; (*i)++)
    os << "  " << i->getKey () << " -> " << i->ref () << endl;
   
  delete i;
}

#endif