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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 
00033 #include "Teuchos_TypeNameTraits.hpp"
00034 
00035 
00036 namespace Teuchos {
00037 
00038 
00047 class m_bad_cast : public std::bad_cast {
00048   std::string msg;
00049 public:
00050   explicit m_bad_cast(const std::string&  what_arg ) : msg(what_arg) {}
00051   virtual ~m_bad_cast() throw() {}
00052   virtual const char* what() const throw() { return msg.data(); }
00053 };
00054 
00055 
00056 // Throw <tt>m_bad_cast</tt> for below function
00057 TEUCHOS_LIB_DLL_EXPORT void dyn_cast_throw_exception(
00058   const std::string &T_from,
00059   const std::string &T_from_concr,
00060   const std::string &T_to
00061   );
00062 
00063 
00158 template <class T_To, class T_From>
00159 inline
00160 T_To& dyn_cast(T_From &from)
00161 {
00162   T_To *to_ = dynamic_cast<T_To*>(&from);
00163   if(!to_)
00164     dyn_cast_throw_exception(
00165       TypeNameTraits<T_From>::name(),
00166       typeName(from),
00167       TypeNameTraits<T_To>::name()
00168       );
00169   return *to_;
00170 }
00171 
00172 
00173 } // namespace Teuchos
00174 
00175 
00176 #endif // TEUCHOS_DYN_CAST_HPP
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