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1 | /*! |
2 | @file | |
3 | Forward declares `boost::hana::max`. | |
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_MAX_HPP | |
11 | #define BOOST_HANA_FWD_MAX_HPP | |
12 | ||
13 | #include <boost/hana/config.hpp> | |
14 | #include <boost/hana/core/when.hpp> | |
15 | ||
16 | ||
17 | BOOST_HANA_NAMESPACE_BEGIN | |
18 | //! Returns the greatest of its arguments according to the `less` ordering. | |
19 | //! @ingroup group-Orderable | |
20 | //! | |
21 | //! | |
22 | //! @todo Can't specify the signature here either. See `min` for details. | |
23 | //! | |
24 | //! Example | |
25 | //! ------- | |
26 | //! @include example/max.cpp | |
27 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
28 | constexpr auto max = [](auto&& x, auto&& y) -> decltype(auto) { | |
29 | return tag-dispatched; | |
30 | }; | |
31 | #else | |
32 | template <typename T, typename U, typename = void> | |
33 | struct max_impl : max_impl<T, U, when<true>> { }; | |
34 | ||
35 | struct max_t { | |
36 | template <typename X, typename Y> | |
37 | constexpr decltype(auto) operator()(X&& x, Y&& y) const; | |
38 | }; | |
39 | ||
40 | constexpr max_t max{}; | |
41 | #endif | |
42 | BOOST_HANA_NAMESPACE_END | |
43 | ||
44 | #endif // !BOOST_HANA_FWD_MAX_HPP |