projects / ceph.git / blame
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|---|---|---|
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1 | /*! |
| 2 | @file | |
| 3 | Forward declares `boost::hana::basic_tuple`. | |
| 4 | ||
| b32b8144 | 5 | @copyright Louis Dionne 2013-2017 |
| 7c673cae FG |
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_BASIC_TUPLE_HPP | |
| 11 | #define BOOST_HANA_FWD_BASIC_TUPLE_HPP | |
| 12 | ||
| 13 | #include <boost/hana/config.hpp> | |
| 14 | #include <boost/hana/fwd/core/make.hpp> | |
| 15 | ||
| 16 | ||
| 17 | BOOST_HANA_NAMESPACE_BEGIN | |
| 18 | //! @ingroup group-datatypes | |
| 19 | //! Stripped down version of `hana::tuple`. | |
| 20 | //! | |
| 21 | //! Whereas `hana::tuple` aims to provide an interface somewhat close to a | |
| 22 | //! `std::tuple`, `basic_tuple` provides the strict minimum required to | |
| 23 | //! implement a closure with maximum compile-time efficiency. | |
| 24 | //! | |
| 92f5a8d4 TL |
25 | //! @note |
| 26 | //! When you use a container, remember not to make assumptions about its | |
| 27 | //! representation, unless the documentation gives you those guarantees. | |
| 28 | //! More details [in the tutorial](@ref tutorial-containers-types). | |
| 29 | //! | |
| 7c673cae FG |
30 | //! |
| 31 | //! Modeled concepts | |
| 32 | //! ---------------- | |
| 33 | //! `Sequence`, and all the concepts it refines | |
| 34 | template <typename ...Xs> | |
| 35 | struct basic_tuple; | |
| 36 | ||
| 37 | //! Tag representing `hana::basic_tuple`. | |
| 38 | //! @relates hana::basic_tuple | |
| 39 | struct basic_tuple_tag { }; | |
| 40 | ||
| 41 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
| 42 | //! Function object for creating a `basic_tuple`. | |
| 43 | //! @relates hana::basic_tuple | |
| 44 | //! | |
| 45 | //! Given zero or more objects `xs...`, `make<basic_tuple_tag>` returns a | |
| 46 | //! new `basic_tuple` containing those objects. The elements are held by | |
| 47 | //! value inside the resulting tuple, and they are hence copied or moved | |
| 48 | //! in. This is analogous to `std::make_tuple` for creating `basic_tuple`s. | |
| 49 | //! | |
| 50 | //! | |
| 51 | //! Example | |
| 52 | //! ------- | |
| 53 | //! @include example/basic_tuple/make.cpp | |
| 54 | template <> | |
| 55 | constexpr auto make<basic_tuple_tag> = [](auto&& ...xs) { | |
| 56 | return basic_tuple<std::decay_t<decltype(xs)>...>{forwarded(xs)...}; | |
| 57 | }; | |
| 58 | #endif | |
| 59 | ||
| 60 | //! Alias to `make<basic_tuple_tag>`; provided for convenience. | |
| 61 | //! @relates hana::basic_tuple | |
| 62 | //! | |
| 63 | //! | |
| 64 | //! Example | |
| 65 | //! ------- | |
| 66 | //! @include example/basic_tuple/make.cpp | |
| 67 | constexpr auto make_basic_tuple = make<basic_tuple_tag>; | |
| 68 | BOOST_HANA_NAMESPACE_END | |
| 69 | ||
| 70 | #endif // !BOOST_HANA_FWD_BASIC_TUPLE_HPP |