Teuchos_dyn_cast.hpp

// @HEADER
// ***********************************************************************
// 
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
// 
// ***********************************************************************
// @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
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

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