convenience.hpp

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// DUNE DAQ modification notice:
// This file has been modified from the original ATLAS dbe source for the DUNE DAQ project.
// Fork baseline commit: dbe-02-12-17 (2022-05-12).
// Renamed since fork: yes (from dbe/convenience.hpp to include/dbe/convenience.hpp).
 
/************************************************************
 * convenience.hpp                                             *
 *                                                          *
 *  Created on: 1 Mar 2014                                     *
 *      Author: Leonidas Georgopoulos                                     *
 *
 *  Copyright (C) 2014 Leonidas Georgopoulos
 *  Distributed under the Boost Software License, Version 1.0.
 *  (See accompanying file LICENSE_1_0.txt or
 *  copy at http://www.boost.org/LICENSE_1_0.txt)
 *
 ************************************************************/
 
#ifndef LUTILS_CONVENIENCE_HPP_
#define LUTILS_CONVENIENCE_HPP_
 
/*
 * STL inclusions
 */
#include <memory>
#include <string>
#include <typeinfo>
 
/*
 * G++ demangle
 */
#ifdef __GNUG__
#include <cstdlib>
#include <cxxabi.h>
#endif
 
namespace tools {
//------------------------------------------------------------------------------
template<typename T>
class gentraits
{
public:
  typedef std::string t_is;
 
  static t_is constexpr isnot();
 
  static t_is constexpr isa();
 
#ifdef __GNUG__
  static t_is constexpr filt();
#endif
};
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename T>
typename gentraits<T>::t_is constexpr filt(T*)
{
  return gentraits<T>::filt();
}
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename T>
typename gentraits<T>::t_is constexpr gentraits<T>::isnot()
{
  return t_is("ISNOT");
}
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename T>
typename gentraits<T>::t_is constexpr gentraits<T>::isa()
{
  return typeid(T).name();
}
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
#ifdef __GNUG__
template<typename T>
typename gentraits<T>::t_is constexpr gentraits<T>::filt()
{
  int status = -42;
  char* res = abi::__cxa_demangle(typeid(T).name(), NULL, NULL, &status);
 
  if (status != 0) {
    ::free(res);
    return isnot();
  } else {
    typename gentraits<T>::t_is result = res;
    ::free(res);
    return result;
  }
}
#endif
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename A, typename B>
typename gentraits<A>::t_is const
isa(B const&)
{
  return typeid(A).name() == typeid(B).name() ? typeid(A).name() : gentraits<A>::isnot();
}
//------------------------------------------------------------------------------
 
} /* namespace tools */
 
#endif