IdentifierHash.h

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/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
/***************************************************************************
 Identifier package
 -----------------------------------------
 ***************************************************************************/
 
//<doc><file>   $Id: IdentifierHash.h,v 1.4 2003-11-26 12:28:21 schaffer Exp $
//<version> $Name: not supported by cvs2svn $
 
#ifndef IDENTIFIER_IDENTIFIERHASH_H
# define IDENTIFIER_IDENTIFIERHASH_H
 
#include "GaudiKernel/MsgStream.h"
 
 
class IdentifierHash
{
public:
 
 
    typedef unsigned int    value_type;
 
 
    IdentifierHash () = default;
    IdentifierHash (const IdentifierHash& other) =default;
    IdentifierHash (IdentifierHash&& other) =default;
    IdentifierHash& operator=(const IdentifierHash& other) = default;
    IdentifierHash& operator=(IdentifierHash&& other) = default;
    ~IdentifierHash () = default;
 
    IdentifierHash (value_type value);
 
 
    operator unsigned int   (void) const;
    unsigned int value          (void) const;
 
 
    bool is_valid () const;
 
 
    IdentifierHash& operator = (value_type value);
    IdentifierHash& operator += (unsigned int value);
    IdentifierHash& operator -= (unsigned int value);
 
private:
 
    typedef enum {
        max_value = 0xFFFFFFFF
    } max_value_type;
 
    //----------------------------------------------------------------
    // The actual identifier data.
    //----------------------------------------------------------------
    value_type m_value = max_value;
};
//-----------------------------------------------
 
 
 
// Define a hash functional
 
namespace std {
template<>
struct hash<IdentifierHash>
{
  size_t operator()(const IdentifierHash& id) const
  {
    return static_cast<size_t>(id.value());
  }
};
}
 
#include "Identifier/IdentifierHash.icc"
#endif // IDENTIFIER_IDENTIFIERHASH_H