projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*! |
| 2 | @file | |
| 3 | Forward declares `boost::hana::keys`. | |
| 4 | ||
| 5 | @copyright Louis Dionne 2013-2016 | |
| 6 | Distributed under the Boost Software License, Version 1.0. | |
| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
| 8 | */ | |
| 9 | ||
| 10 | #ifndef BOOST_HANA_FWD_KEYS_HPP | |
| 11 | #define BOOST_HANA_FWD_KEYS_HPP | |
| 12 | ||
| 13 | #include <boost/hana/config.hpp> | |
| 14 | #include <boost/hana/core/when.hpp> | |
| 15 | ||
| 16 | ||
| 17 | BOOST_HANA_NAMESPACE_BEGIN | |
| 18 | // Note: This function is documented per datatype/concept only. | |
| 19 | //! @cond | |
| 20 | template <typename T, typename = void> | |
| 21 | struct keys_impl : keys_impl<T, when<true>> { }; | |
| 22 | //! @endcond | |
| 23 | ||
| 24 | struct keys_t { | |
| 25 | template <typename Map> | |
| 26 | constexpr auto operator()(Map&& map) const; | |
| 27 | }; | |
| 28 | ||
| 29 | constexpr keys_t keys{}; | |
| 30 | ||
| 31 | //! Returns a `Sequence` containing the name of the members of | |
| 32 | //! the data structure. | |
| 33 | //! @ingroup group-Struct | |
| 34 | //! | |
| 35 | //! Given a `Struct` object, `keys` returns a `Sequence` containing the | |
| 36 | //! name of all the members of the `Struct`, in the same order as they | |
| 37 | //! appear in the `accessors` sequence. | |
| 38 | //! | |
| 39 | //! | |
| 40 | //! Example | |
| 41 | //! ------- | |
| 42 | //! @include example/struct/keys.cpp | |
| 43 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
| 44 | constexpr auto keys = [](auto&& object) { | |
| 45 | return implementation_defined; | |
| 46 | }; | |
| 47 | #endif | |
| 48 | BOOST_HANA_NAMESPACE_END | |
| 49 | ||
| 50 | #endif // !BOOST_HANA_FWD_KEYS_HPP |