Teuchos_dyn_cast.hpp

00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #ifndef TEUCHOS_DYN_CAST_HPP
00030 #define TEUCHOS_DYN_CAST_HPP
00031 
00032 #include "Teuchos_TypeNameTraits.hpp"
00033 
00034 namespace Teuchos {
00035 
00044 class m_bad_cast : public std::bad_cast {
00045   std::string msg;
00046 public:
00047   explicit m_bad_cast(const std::string&  what_arg ) : msg(what_arg) {}
00048   virtual ~m_bad_cast() throw() {}
00049   virtual const char* what() const throw() { return msg.data(); }
00050 };
00051 
00052 // Throw the std::exception <tt>std::invalid_argument</tt> for below functions
00053 void dyn_cast_throw_exception(
00054   const std::string   &type_from_name
00055   ,const std::string  &type_from_concr_name
00056   ,const std::string  &type_to_name
00057   );
00058 
00153 template <class T_To, class T_From>
00154 inline
00155 T_To& dyn_cast(T_From &from)
00156 {
00157   T_To *to_ = dynamic_cast<T_To*>(&from);
00158   if(!to_)
00159     dyn_cast_throw_exception(
00160       TypeNameTraits<T_From>::name()
00161       ,typeName(from)
00162       ,TypeNameTraits<T_To>::name()
00163       );
00164   return *to_;
00165 }
00166 
00167 } // namespace Teuchos
00168 
00169 #endif // TEUCHOS_DYN_CAST_HPP

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