projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | //----------------------------------------------------------------------------- |
| 2 | // boost variant/detail/element_index.hpp header file | |
| 3 | // See http://www.boost.org for updates, documentation, and revision history. | |
| 4 | //----------------------------------------------------------------------------- | |
| 5 | // | |
| 6 | // Copyright (c) 2014-2015 Antony Polukhin | |
| 7 | // | |
| 8 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 9 | // accompanying file LICENSE_1_0.txt or copy at | |
| 10 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 11 | ||
| 12 | #ifndef BOOST_VARIANT_DETAIL_ELEMENT_INDEX_HPP | |
| 13 | #define BOOST_VARIANT_DETAIL_ELEMENT_INDEX_HPP | |
| 14 | ||
| 15 | #include <boost/config.hpp> | |
| 16 | #include <boost/variant/recursive_wrapper_fwd.hpp> | |
| 17 | #include <boost/variant/variant_fwd.hpp> | |
| 18 | ||
| 19 | #include <boost/type_traits/remove_cv.hpp> | |
| 20 | #include <boost/type_traits/remove_reference.hpp> | |
| 21 | #include <boost/mpl/find_if.hpp> | |
| 22 | ||
| 23 | namespace boost { namespace detail { namespace variant { | |
| 24 | ||
| 25 | template <class VariantElement, class T> | |
| 26 | struct variant_element_functor : | |
| 27 | boost::mpl::or_< | |
| 28 | boost::is_same<VariantElement, T>, | |
| 29 | boost::is_same<VariantElement, boost::recursive_wrapper<T> >, | |
| 30 | boost::is_same<VariantElement, T& > | |
| 31 | > | |
| 32 | {}; | |
| 33 | ||
| 34 | template <class Types, class T> | |
| 35 | struct element_iterator_impl : | |
| 36 | boost::mpl::find_if< | |
| 37 | Types, | |
| 38 | boost::mpl::or_< | |
| 39 | variant_element_functor<boost::mpl::_1, T>, | |
| 40 | variant_element_functor<boost::mpl::_1, typename boost::remove_cv<T>::type > | |
| 41 | > | |
| 42 | > | |
| 43 | {}; | |
| 44 | ||
| 45 | template <class Variant, class T> | |
| 46 | struct element_iterator : | |
| 47 | element_iterator_impl< typename Variant::types, typename boost::remove_reference<T>::type > | |
| 48 | {}; | |
| 49 | ||
| 50 | template <class Variant, class T> | |
| 51 | struct holds_element : | |
| 52 | boost::mpl::not_< | |
| 53 | boost::is_same< | |
| 54 | typename boost::mpl::end<typename Variant::types>::type, | |
| 55 | typename element_iterator<Variant, T>::type | |
| 56 | > | |
| 57 | > | |
| 58 | {}; | |
| 59 | ||
| 60 | ||
| 61 | }}} // namespace boost::detail::variant | |
| 62 | ||
| 63 | #endif // BOOST_VARIANT_DETAIL_ELEMENT_INDEX_HPP |