Control/AthenaKernel/AthenaKernel/ClassID_traits.h

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/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef ATHENAKERNEL_CLASSID_TRAITS_H
#define ATHENAKERNEL_CLASSID_TRAITS_H
 
#include <string>
#include <typeinfo>
 
 
#include "GaudiKernel/ClassID.h"
#include "GaudiKernel/DataObject.h"
#include "GaudiKernel/System.h"
 
#include "AthenaKernel/CLIDRegistry.h"
#include "AthenaKernel/ClassName.h"
 
#include <type_traits>
 
 
 
template <bool x> struct ERROR_you_should_use_the_CLASS_DEF_macro_to_define_CLID_and_VERSION;
template <>       struct ERROR_you_should_use_the_CLASS_DEF_macro_to_define_CLID_and_VERSION<true>{};
 
#define MY_STATIC_ASSERT( B ) \
  static_assert (B, "You should use the CLASS_DEF macro to define CLID and VERSION");
 
template <typename T>
struct ClassID_traits {
  //default only works for DataObjects
  typedef std::is_base_of<DataObject, T> isDObj_t; 
  static const bool s_isDataObject = isDObj_t::value;
 
  //default traits for class ID assignment
  typedef std::integral_constant<bool, s_isDataObject> is_DataObject_tag;
 
  static const CLID& ID() { 
    MY_STATIC_ASSERT(s_isDataObject);
    return T::classID(); 
  }
 
  static const std::string& typeName() {
    MY_STATIC_ASSERT(s_isDataObject);
    static const std::string tname = System::typeinfoName(typeid(T));
    return tname;
  }
 
  static const std::type_info& typeInfo() {
    MY_STATIC_ASSERT(s_isDataObject);
    return typeid(T);
  }
 
  typedef std::false_type has_version_tag;
  typedef std::false_type has_classID_tag;
  static const int s_version = 0;
 
  // Is this is true, these types will automatically be made
  // const when added to StoreGate.
  static const bool s_isConst = false;
};
 
#undef MY_STATIC_ASSERT
 
#endif // not ATHENAKERNEL_CLASSID_TRAITS_H