HandleClassifier.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 ATHENABASECOMPS_HANDLECLASSIFIER_H
#define ATHENABASECOMPS_HANDLECLASSIFIER_H
 
 
#include "StoreGate/VarHandleBase.h"
#include "StoreGate/VarHandleKey.h"
#include "StoreGate/VarHandleKeyArray.h"
#include <type_traits>
 
 
namespace SG {
 
 
// Tags to describe the type of a handle property.
class VarHandleType {};
class VarHandleKeyType {};
class VarHandleKeyArrayType {};
class NotHandleType {};
 
 
template <class T>
struct HandleClassifier
{
  typedef typename std::conditional<std::is_base_of<SG::VarHandleBase, T>::value,
                                    VarHandleType,
                                    NotHandleType>::type type1;
 
  typedef typename std::conditional<std::is_base_of<SG::VarHandleKey, T>::value,
                                    VarHandleKeyType,
                                    type1>::type type2;
 
 
  typedef typename std::conditional<std::is_base_of<SG::VarHandleKeyArray, T>::value,
                                    VarHandleKeyArrayType,
                                    type2>::type type;
};
 
 
} // namespace SG
 
 
#endif // not ATHENABASECOMPS_HANDLECLASSIFIER_H