| 123456789101112131415161718192021222324252627282930313233 |
- /*!
- @file
- Defines `boost::hana::Comonad`.
- @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_COMONAD_HPP
- #define BOOST_HANA_CONCEPT_COMONAD_HPP
- #include <boost/hana/fwd/concept/comonad.hpp>
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/default.hpp>
- #include <boost/hana/core/tag_of.hpp>
- #include <boost/hana/duplicate.hpp>
- #include <boost/hana/extend.hpp>
- #include <boost/hana/extract.hpp>
- BOOST_HANA_NAMESPACE_BEGIN
- template <typename W>
- struct Comonad {
- using Tag = typename tag_of<W>::type;
- static constexpr bool value = !is_default<extract_impl<Tag>>::value &&
- (!is_default<duplicate_impl<Tag>>::value ||
- !is_default<extend_impl<Tag>>::value);
- };
- BOOST_HANA_NAMESPACE_END
- #endif // !BOOST_HANA_CONCEPT_COMONAD_HPP
|
