Teuchos_dyn_cast.hpp

// @HEADER
// *****************************************************************************
//                    Teuchos: Common Tools Package
//
// Copyright 2004 NTESS and the Teuchos contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef TEUCHOS_DYN_CAST_HPP
#define TEUCHOS_DYN_CAST_HPP


#include "Teuchos_TypeNameTraits.hpp"


namespace Teuchos {


class m_bad_cast : public std::bad_cast {
  std::string msg;
public:
  explicit m_bad_cast(const std::string&  what_arg ) : msg(what_arg) {}
  virtual ~m_bad_cast() throw() {}
  virtual const char* what() const throw() { return msg.data(); }
};


// Throw <tt>m_bad_cast</tt> for below function
TEUCHOSCORE_LIB_DLL_EXPORT void dyn_cast_throw_exception(
  const std::string &T_from,
  const std::string &T_from_concr,
  const std::string &T_to
  );


template <class T_To, class T_From>
inline
T_To& dyn_cast(T_From &from)
{
  T_To *to_ = dynamic_cast<T_To*>(&from);
  if(!to_)
    dyn_cast_throw_exception(
      TypeNameTraits<T_From>::name(),
      typeName(from),
      TypeNameTraits<T_To>::name()
      );
  return *to_;
}


} // namespace Teuchos


#endif // TEUCHOS_DYN_CAST_HPP