1 //-----------------------------------------------------------------------------

     2 // boost variant/bad_visit.hpp header file

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

     4 //-----------------------------------------------------------------------------

     5 //

     6 // Copyright (c) 2002-2003

     7 // Eric Friedman

     8 //

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

    10 // accompanying file LICENSE_1_0.txt or copy at

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

    12 

    13 #ifndef BOOST_VARIANT_BAD_VISIT_HPP

    14 #define BOOST_VARIANT_BAD_VISIT_HPP

    15 

    16 #include <exception>

    17 

    18 namespace boost {

    19 

    20 //////////////////////////////////////////////////////////////////////////

    21 // class bad_visit

    22 //

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

    24 // to invalid visited subtype or contents.

    25 //

    26 struct bad_visit

    27     : std::exception

    28 {

    29 public: // std::exception interface

    30 

    31     virtual const char * what() const throw()

    32     {

    33         return "boost::bad_visit: "

    34                "failed visitation using boost::apply_visitor";

    35     }

    36 

    37 };

    38 

    39 } // namespace boost

    40 

    41 #endif // BOOST_VARIANT_BAD_VISIT_HPP