//-----------------------------------------------------------------------------

 // boost variant/bad_visit.hpp header file

 // See http://www.boost.org for updates, documentation, and revision history.

 //-----------------------------------------------------------------------------

 //

 // Copyright (c) 2002-2003

 // Eric Friedman

 //

 // Distributed under the Boost Software License, Version 1.0. (See

 // accompanying file LICENSE_1_0.txt or copy at

 // http://www.boost.org/LICENSE_1_0.txt)

 #ifndef BOOST_VARIANT_BAD_VISIT_HPP

 #define BOOST_VARIANT_BAD_VISIT_HPP

 #include <exception>

 namespace boost {

 //////////////////////////////////////////////////////////////////////////

 // class bad_visit

 //

 // Exception thrown when a visitation attempt via apply_visitor fails due

 // to invalid visited subtype or contents.

 //

 struct bad_visit

     : std::exception

 {

 public: // std::exception interface

     virtual const char * what() const throw()

     {

         return "boost::bad_visit: "

                "failed visitation using boost::apply_visitor";

     }

 };

 } // namespace boost

 #endif // BOOST_VARIANT_BAD_VISIT_HPP