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Diffstat (limited to 'boost/hana/detail/operators/monad.hpp')
-rw-r--r-- | boost/hana/detail/operators/monad.hpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/boost/hana/detail/operators/monad.hpp b/boost/hana/detail/operators/monad.hpp new file mode 100644 index 0000000000..4cdf76b178 --- /dev/null +++ b/boost/hana/detail/operators/monad.hpp @@ -0,0 +1,35 @@ +/*! +@file +Defines operators for Monads. + +@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_DETAIL_OPERATORS_MONAD_HPP +#define BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP + +#include <boost/hana/config.hpp> +#include <boost/hana/core/tag_of.hpp> +#include <boost/hana/fwd/chain.hpp> + +#include <type_traits> + + +BOOST_HANA_NAMESPACE_BEGIN namespace detail { + template <typename Tag> + struct monad_operators { + static constexpr bool value = false; + }; + + namespace operators { + template <typename Xs, typename F, typename = typename std::enable_if< + detail::monad_operators<typename hana::tag_of<Xs>::type>::value + >::type> + constexpr auto operator|(Xs&& xs, F&& f) + { return hana::chain(static_cast<Xs&&>(xs), static_cast<F&&>(f)); } + } // end namespace operators +} BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP |