Teuchos - Trilinos Tools Package Version of the Day
Teuchos_dyn_cast.hpp
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00004 //                    Teuchos: Common Tools Package
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00041 
00042 #ifndef TEUCHOS_DYN_CAST_HPP
00043 #define TEUCHOS_DYN_CAST_HPP
00044 
00045 
00046 #include "Teuchos_TypeNameTraits.hpp"
00047 
00048 
00049 namespace Teuchos {
00050 
00051 
00060 class m_bad_cast : public std::bad_cast {
00061   std::string msg;
00062 public:
00063   explicit m_bad_cast(const std::string&  what_arg ) : msg(what_arg) {}
00064   virtual ~m_bad_cast() throw() {}
00065   virtual const char* what() const throw() { return msg.data(); }
00066 };
00067 
00068 
00069 // Throw <tt>m_bad_cast</tt> for below function
00070 TEUCHOS_LIB_DLL_EXPORT void dyn_cast_throw_exception(
00071   const std::string &T_from,
00072   const std::string &T_from_concr,
00073   const std::string &T_to
00074   );
00075 
00076 
00171 template <class T_To, class T_From>
00172 inline
00173 T_To& dyn_cast(T_From &from)
00174 {
00175   T_To *to_ = dynamic_cast<T_To*>(&from);
00176   if(!to_)
00177     dyn_cast_throw_exception(
00178       TypeNameTraits<T_From>::name(),
00179       typeName(from),
00180       TypeNameTraits<T_To>::name()
00181       );
00182   return *to_;
00183 }
00184 
00185 
00186 } // namespace Teuchos
00187 
00188 
00189 #endif // TEUCHOS_DYN_CAST_HPP
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