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- /*!
- @file
- Defines `boost::hana::Group`.
- @copyright Louis Dionne 2013-2016
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- */
- #ifndef BOOST_HANA_CONCEPT_GROUP_HPP
- #define BOOST_HANA_CONCEPT_GROUP_HPP
- #include <boost/hana/fwd/concept/group.hpp>
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/default.hpp>
- #include <boost/hana/core/tag_of.hpp>
- #include <boost/hana/minus.hpp>
- #include <boost/hana/negate.hpp>
- BOOST_HANA_NAMESPACE_BEGIN
- template <typename G>
- struct Group {
- using Tag = typename tag_of<G>::type;
- static constexpr bool value = !is_default<negate_impl<Tag>>::value ||
- !is_default<minus_impl<Tag, Tag>>::value;
- };
- BOOST_HANA_NAMESPACE_END
- #endif // !BOOST_HANA_CONCEPT_GROUP_HPP
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