/*!
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@file
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Defines operators for Monads.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP
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#define BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/tag_of.hpp>
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#include <boost/hana/fwd/chain.hpp>
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#include <type_traits>
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BOOST_HANA_NAMESPACE_BEGIN namespace detail {
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template <typename Tag>
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struct monad_operators {
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static constexpr bool value = false;
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};
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namespace operators {
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template <typename Xs, typename F, typename = typename std::enable_if<
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detail::monad_operators<typename hana::tag_of<Xs>::type>::value
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>::type>
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constexpr auto operator|(Xs&& xs, F&& f)
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{ return hana::chain(static_cast<Xs&&>(xs), static_cast<F&&>(f)); }
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} // end namespace operators
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} BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP
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