]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | /*! |
2 | @file | |
3 | Forward declares `boost::hana::all`. | |
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_ALL_HPP | |
11 | #define BOOST_HANA_FWD_ALL_HPP | |
12 | ||
13 | #include <boost/hana/config.hpp> | |
14 | #include <boost/hana/core/when.hpp> | |
15 | ||
16 | ||
17 | BOOST_HANA_NAMESPACE_BEGIN | |
18 | //! Returns whether all the keys of the structure are true-valued. | |
19 | //! @ingroup group-Searchable | |
20 | //! | |
21 | //! The keys of the structure must be `Logical`s. If the structure is not | |
22 | //! finite, a false-valued key must appear at a finite "index" in order | |
23 | //! for this method to finish. | |
24 | //! | |
25 | //! | |
26 | //! Example | |
27 | //! ------- | |
28 | //! @include example/all.cpp | |
29 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
30 | constexpr auto all = [](auto&& xs) { | |
31 | return tag-dispatched; | |
32 | }; | |
33 | #else | |
34 | template <typename S, typename = void> | |
35 | struct all_impl : all_impl<S, when<true>> { }; | |
36 | ||
37 | struct all_t { | |
38 | template <typename Xs> | |
39 | constexpr auto operator()(Xs&& xs) const; | |
40 | }; | |
41 | ||
42 | constexpr all_t all{}; | |
43 | #endif | |
44 | BOOST_HANA_NAMESPACE_END | |
45 | ||
46 | #endif // !BOOST_HANA_FWD_ALL_HPP |