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|---|---|---|
| 7c673cae FG |
1 | //----------------------------------------------------------------------------- |
| 2 | // boost variant/detail/over_sequence.hpp header file | |
| 3 | // See http://www.boost.org for updates, documentation, and revision history. | |
| 4 | //----------------------------------------------------------------------------- | |
| 5 | // | |
| 6 | // Copyright (c) 2003 | |
| 7 | // Eric Friedman | |
| 8 | // | |
| 9 | // Portions Copyright (C) 2002 David Abrahams | |
| 10 | // | |
| 11 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 12 | // accompanying file LICENSE_1_0.txt or copy at | |
| 13 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 14 | ||
| 15 | #ifndef BOOST_VARIANT_DETAIL_OVER_SEQUENCE_HPP | |
| 16 | #define BOOST_VARIANT_DETAIL_OVER_SEQUENCE_HPP | |
| 17 | ||
| 18 | #include <boost/mpl/aux_/config/ctps.hpp> | |
| 19 | ||
| 20 | ||
| 21 | namespace boost { | |
| 22 | namespace detail { namespace variant { | |
| 23 | ||
| 24 | /////////////////////////////////////////////////////////////////////////////// | |
| 25 | // (detail) class over_sequence | |
| 26 | // | |
| 27 | // Wrapper used to indicate bounded types for variant are from type sequence. | |
| 28 | // | |
| 29 | template <typename Types> | |
| 30 | struct over_sequence | |
| 31 | { | |
| 32 | typedef Types type; | |
| 33 | }; | |
| 34 | ||
| 35 | /////////////////////////////////////////////////////////////////////////////// | |
| 36 | // (detail) metafunction is_over_sequence (modeled on code by David Abrahams) | |
| 37 | // | |
| 38 | // Indicates whether the specified type is of form over_sequence<...> or not. | |
| 39 | // | |
| 40 | ||
| 41 | ||
| 42 | template <typename T> | |
| 43 | struct is_over_sequence | |
| 44 | : mpl::false_ | |
| 45 | { | |
| 46 | }; | |
| 47 | ||
| 48 | template <typename Types> | |
| 49 | struct is_over_sequence< over_sequence<Types> > | |
| 50 | : mpl::true_ | |
| 51 | { | |
| 52 | }; | |
| 53 | ||
| 54 | ||
| 55 | }} // namespace detail::variant | |
| 56 | } // namespace boost | |
| 57 | ||
| 58 | #endif // BOOST_VARIANT_DETAIL_OVER_SEQUENCE_HPP |