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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 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 |