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1 | /*! |
2 | @file | |
3 | Defines `boost::hana::detail::operators::adl`. | |
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_DETAIL_OPERATORS_ADL_HPP | |
11 | #define BOOST_HANA_DETAIL_OPERATORS_ADL_HPP | |
12 | ||
13 | #include <boost/hana/config.hpp> | |
14 | ||
15 | ||
16 | BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace operators { | |
17 | //! @ingroup group-details | |
18 | //! Enables [ADL](http://en.cppreference.com/w/cpp/language/adl) in the | |
19 | //! `hana::detail::operators` namespace. | |
20 | //! | |
21 | //! This is used by containers in Hana as a quick way to automatically | |
22 | //! define the operators associated to some concepts, in conjunction | |
23 | //! with the `detail::xxx_operators` family of metafunctions. | |
24 | //! | |
25 | //! Note that `adl` can be passed template arguments to make it unique | |
26 | //! amongst a set of derived classes. This allows a set of derived classes | |
27 | //! not to possess a common base class, which would disable the EBO when | |
28 | //! many of these derived classes are stored in a Hana container. If EBO | |
29 | //! is not a concern, `adl<>` can simply be used. | |
30 | template <typename ...> | |
31 | struct adl { }; | |
32 | }} BOOST_HANA_NAMESPACE_END | |
33 | ||
34 | #endif // !BOOST_HANA_DETAIL_OPERATORS_ADL_HPP |