diff options
Diffstat (limited to 'boost/hana/concept/monad_plus.hpp')
| -rw-r--r-- | boost/hana/concept/monad_plus.hpp | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/boost/hana/concept/monad_plus.hpp b/boost/hana/concept/monad_plus.hpp index 22c67ca255..c561e5af82 100644 --- a/boost/hana/concept/monad_plus.hpp +++ b/boost/hana/concept/monad_plus.hpp @@ -16,16 +16,18 @@ Distributed under the Boost Software License, Version 1.0. #include <boost/hana/config.hpp> #include <boost/hana/core/default.hpp> #include <boost/hana/core/tag_of.hpp> +#include <boost/hana/detail/integral_constant.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; - }; + struct MonadPlus + : hana::integral_constant<bool, + !is_default<concat_impl<typename tag_of<M>::type>>::value && + !is_default<empty_impl<typename tag_of<M>::type>>::value + > + { }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_CONCEPT_MONAD_PLUS_HPP |