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1 | /*! |
2 | @file | |
3 | Forward declares `boost::hana::all_of`. | |
4 | ||
b32b8144 | 5 | @copyright Louis Dionne 2013-2017 |
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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_OF_HPP | |
11 | #define BOOST_HANA_FWD_ALL_OF_HPP | |
12 | ||
13 | #include <boost/hana/config.hpp> | |
14 | #include <boost/hana/core/when.hpp> | |
15 | ||
16 | ||
1e59de90 | 17 | namespace boost { namespace hana { |
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18 | //! Returns whether all the keys of the structure satisfy the `predicate`. |
19 | //! @ingroup group-Searchable | |
20 | //! | |
21 | //! If the structure is not finite, `predicate` has to return a false- | |
22 | //! valued `Logical` after looking at a finite number of keys for this | |
23 | //! method to finish. | |
24 | //! | |
25 | //! | |
26 | //! @param xs | |
27 | //! The structure to search. | |
28 | //! | |
29 | //! @param predicate | |
30 | //! A function called as `predicate(k)`, where `k` is a key of the | |
31 | //! structure, and returning a `Logical`. | |
32 | //! | |
33 | //! | |
34 | //! Example | |
35 | //! ------- | |
36 | //! @include example/all_of.cpp | |
37 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
38 | constexpr auto all_of = [](auto&& xs, auto&& predicate) { | |
39 | return tag-dispatched; | |
40 | }; | |
41 | #else | |
42 | template <typename S, typename = void> | |
43 | struct all_of_impl : all_of_impl<S, when<true>> { }; | |
44 | ||
45 | struct all_of_t { | |
46 | template <typename Xs, typename Pred> | |
47 | constexpr auto operator()(Xs&& xs, Pred&& pred) const; | |
48 | }; | |
49 | ||
1e59de90 | 50 | BOOST_HANA_INLINE_VARIABLE constexpr all_of_t all_of{}; |
7c673cae | 51 | #endif |
1e59de90 | 52 | }} // end namespace boost::hana |
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53 | |
54 | #endif // !BOOST_HANA_FWD_ALL_OF_HPP |