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 
whatboost::bad_visit31     virtual const char * what() const BOOST_NOEXCEPT_OR_NOTHROW
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
42