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1 | /*! |
2 | @file | |
3 | Defines `boost::hana::Group`. | |
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_CONCEPT_GROUP_HPP | |
11 | #define BOOST_HANA_CONCEPT_GROUP_HPP | |
12 | ||
13 | #include <boost/hana/fwd/concept/group.hpp> | |
14 | ||
15 | #include <boost/hana/config.hpp> | |
16 | #include <boost/hana/core/default.hpp> | |
17 | #include <boost/hana/core/tag_of.hpp> | |
b32b8144 | 18 | #include <boost/hana/detail/integral_constant.hpp> |
7c673cae FG |
19 | #include <boost/hana/minus.hpp> |
20 | #include <boost/hana/negate.hpp> | |
21 | ||
22 | ||
1e59de90 | 23 | namespace boost { namespace hana { |
7c673cae | 24 | template <typename G> |
b32b8144 FG |
25 | struct Group |
26 | : hana::integral_constant<bool, | |
27 | !is_default<negate_impl<typename tag_of<G>::type>>::value || | |
28 | !is_default<minus_impl<typename tag_of<G>::type, | |
29 | typename tag_of<G>::type>>::value | |
30 | > | |
31 | { }; | |
1e59de90 | 32 | }} // end namespace boost::hana |
7c673cae FG |
33 | |
34 | #endif // !BOOST_HANA_CONCEPT_GROUP_HPP |