IndexHolder.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id$
#ifndef ATHLINKS_INDEXHOLDER_H
#define ATHLINKS_INDEXHOLDER_H
 
 
namespace SG {
 
 
template <class T>
class IndexHolder
{
public:
  IndexHolder() : m_index(), m_valid(false) {}
  
  IndexHolder (const T& t) : m_index(t), m_valid(true) {}
 
  bool isValid() const { return m_valid; }
 
  void reset() { m_valid = false; m_index = T(); }
 
  operator const T&() const { return m_index; }
 
 
private:
  T m_index;
 
  bool m_valid;
};
 
 
} // namespace SG
 
 
#endif // not ATHLINKS_INDEXHOLDER_H