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- /*!
- @file
- Defines `boost::hana::MonadPlus`.
- @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_MONAD_PLUS_HPP
- #define BOOST_HANA_CONCEPT_MONAD_PLUS_HPP
- #include <boost/hana/fwd/concept/monad_plus.hpp>
- #include <boost/hana/concat.hpp>
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/default.hpp>
- #include <boost/hana/core/tag_of.hpp>
- #include <boost/hana/empty.hpp>
- BOOST_HANA_NAMESPACE_BEGIN
- template <typename M>
- struct MonadPlus {
- using Tag = typename tag_of<M>::type;
- static constexpr bool value = !is_default<concat_impl<Tag>>::value &&
- !is_default<empty_impl<Tag>>::value;
- };
- BOOST_HANA_NAMESPACE_END
- #endif // !BOOST_HANA_CONCEPT_MONAD_PLUS_HPP
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