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/*!
@file
Defines `boost::hana::suffix`.
@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_SUFFIX_HPP
#define BOOST_HANA_SUFFIX_HPP
#include <boost/hana/fwd/suffix.hpp>
#include <boost/hana/chain.hpp>
#include <boost/hana/concept/monad_plus.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/functional/partial.hpp>
#include <boost/hana/lift.hpp>
#include <boost/hana/prepend.hpp>
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template <typename Xs, typename Sfx>
constexpr auto suffix_t::operator()(Xs&& xs, Sfx&& sfx) const {
using M = typename hana::tag_of<Xs>::type;
using Suffix = BOOST_HANA_DISPATCH_IF(suffix_impl<M>,
hana::MonadPlus<M>::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::MonadPlus<M>::value,
"hana::suffix(xs, sfx) requires 'xs' to be a MonadPlus");
#endif
return Suffix::apply(static_cast<Xs&&>(xs), static_cast<Sfx&&>(sfx));
}
//! @endcond
template <typename M, bool condition>
struct suffix_impl<M, when<condition>> : default_ {
template <typename Xs, typename Z>
static constexpr auto apply(Xs&& xs, Z&& z) {
return hana::chain(static_cast<Xs&&>(xs),
hana::partial(hana::prepend, hana::lift<M>(static_cast<Z&&>(z))));
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_SUFFIX_HPP
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