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// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.

#ifndef PointerTable_INCLUDED
#define PointerTable_INCLUDED 1

#include "Vector.h"
#include "Boolean.h"
#include <stddef.h>

#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif

template<class P, class K, class HF, class KF> class PointerTableIter;

template<class P, class K, class HF, class KF>
class PointerTable {
  void constraints() {
    P p(0);
    const K &key = KF::key(*p);
    unsigned long n = HF::hash(key);
    n = 0;			// prevent warning
  }
public:
  PointerTable();
  P insert(P, Boolean replace = 0);
  // Return a reference so that it is possible to do
  // lookups into a table of smart-pointers from multiple threads.
  const P &lookup(const K &) const;
  P remove(const K &);
  size_t count() const { return used_; }
  void clear();
  void swap(PointerTable<P, K, HF, KF> &);
protected:
  size_t used_;
  size_t usedLimit_;
  Vector<P> vec_;
  P null_;

  size_t startIndex(const K &k) const {
    return size_t(HF::hash(k) & (vec_.size() - 1));
  }
  size_t nextIndex(size_t i) const {
    return i == 0 ? vec_.size() - 1 : i - 1;
  }
  friend class PointerTableIter<P, K, HF, KF>;
};

template<class P, class K, class HF, class KF>
class PointerTableIter {
public:
  PointerTableIter(const PointerTable<P, K, HF, KF> &);
  const P &next();
private:
  const PointerTable<P, K, HF, KF> *tablePtr_;
  size_t i_;
};

#ifdef SP_NAMESPACE
}
#endif

#endif /* not PointerTable_INCLUDED */

#ifdef SP_DEFINE_TEMPLATES
#include "PointerTable.cxx"
#endif