StringPool.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef SGTOOLS_STRINGPOOL_H
#define SGTOOLS_STRINGPOOL_H
 
#include <stdint.h>
#include <string>
#include <memory>
 
namespace SG {
 
class StringPoolImpl;
 
class StringPool
{
public:
  typedef uint32_t sgkey_t;

  typedef unsigned int sgaux_t;

  static const int sgkey_t_nbits = 30;
  static const sgkey_t sgkey_t_max =
    (static_cast<sgkey_t>(1) << sgkey_t_nbits) - 1;

  StringPool();

  ~StringPool();

  StringPool (const StringPool& other);
  StringPool (StringPool&& other);

  StringPool& operator= (const StringPool& other);
  StringPool& operator= (StringPool&& other);

  sgkey_t stringToKey (const std::string& str, sgaux_t aux = 0);

  const std::string* keyToString (sgkey_t key) const;

  const std::string* keyToString (sgkey_t key, sgaux_t& aux) const;

  bool registerKey (sgkey_t key,
                    const std::string& str,
                    sgaux_t aux = 0);
 

  size_t size() const;

  void dump() const;
 

  void clear();
 

  bool merge (const StringPool& other);
 
 
private:
  std::unique_ptr<StringPoolImpl> m_impl;
};
 
 
} // namespace SG
 
 
#endif // not SGTOOLS_STRINGPOOL_H