FM / hana

/usr/include/boost/hana

Name	Size	Mode	Actions
concept/	-	0755	rm
core/	-	0755	rm
detail/	-	0755	rm
experimental/	-	0755	rm
ext/	-	0755	rm
functional/	-	0755	rm
fwd/	-	0755	rm
accessors.hpp	1513	0644	edit dl rm
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Edit: /usr/include/boost/hana/filter.hpp (4473B)

/*!
@file
Defines `boost::hana::filter`.

@copyright Louis Dionne 2013-2017
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_FILTER_HPP
#define BOOST_HANA_FILTER_HPP

#include <boost/hana/fwd/filter.hpp>

#include <boost/hana/at.hpp>
#include <boost/hana/bool.hpp>
#include <boost/hana/chain.hpp>
#include <boost/hana/concept/monad_plus.hpp>
#include <boost/hana/concept/sequence.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/core/make.hpp>
#include <boost/hana/detail/algorithm.hpp>
#include <boost/hana/detail/array.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/empty.hpp>
#include <boost/hana/lift.hpp>
#include <boost/hana/unpack.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Xs, typename Pred>
    constexpr auto filter_t::operator()(Xs&& xs, Pred&& pred) const {
        using M = typename hana::tag_of<Xs>::type;
        using Filter = BOOST_HANA_DISPATCH_IF(filter_impl<M>,
            hana::MonadPlus<M>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::MonadPlus<M>::value,
        "hana::filter(xs, pred) requires 'xs' to be a MonadPlus");
    #endif

return Filter::apply(static_cast<Xs&&>(xs),
                             static_cast<Pred&&>(pred));
    }
    //! @endcond

namespace detail {
        template <typename Pred, typename M>
        struct lift_or_empty {
            template <typename X>
            static constexpr auto helper(X&& x, hana::true_)
            { return hana::lift<M>(static_cast<X&&>(x)); }

template <typename X>
            static constexpr auto helper(X&&, hana::false_)
            { return hana::empty<M>(); }

template <typename X>
            constexpr auto operator()(X&& x) const {
                constexpr bool cond = decltype(std::declval<Pred>()(x))::value;
                return helper(static_cast<X&&>(x), hana::bool_c<cond>);
            }
        };
    }

template <typename M, bool condition>
    struct filter_impl<M, when<condition>> : default_ {
        template <typename Xs, typename Pred>
        static constexpr decltype(auto) apply(Xs&& xs, Pred const&) {
            return hana::chain(static_cast<Xs&&>(xs),
                detail::lift_or_empty<Pred, M>{}
            );
        }
    };

namespace detail {
        template <bool ...b>
        struct filter_indices {
            static constexpr auto compute_indices() {
                constexpr bool bs[] = {b..., false}; // avoid empty array
                constexpr std::size_t N = detail::count(bs, bs + sizeof(bs), true);
                detail::array<std::size_t, N> indices{};
                std::size_t* keep = &indices[0];
                for (std::size_t i = 0; i < sizeof...(b); ++i)
                    if (bs[i])
                        *keep++ = i;
                return indices;
            }

static constexpr auto cached_indices = compute_indices();
        };

template <typename Pred>
        struct make_filter_indices {
            Pred const& pred;
            template <typename ...X>
            auto operator()(X&& ...x) const -> filter_indices<
                static_cast<bool>(detail::decay<
                    decltype(pred(static_cast<X&&>(x)))
                >::type::value)...
            > { return {}; }
        };
    }

template <typename S>
    struct filter_impl<S, when<Sequence<S>::value>> {
        template <typename Indices, typename Xs, std::size_t ...i>
        static constexpr auto filter_helper(Xs&& xs, std::index_sequence<i...>) {
            return hana::make<S>(
                hana::at_c<Indices::cached_indices[i]>(static_cast<Xs&&>(xs))...
            );
        }

template <typename Xs, typename Pred>
        static constexpr auto apply(Xs&& xs, Pred const& pred) {
            using Indices = decltype(
                hana::unpack(static_cast<Xs&&>(xs),
                             detail::make_filter_indices<Pred>{pred})
            );

return filter_impl::filter_helper<Indices>(
                static_cast<Xs&&>(xs),
                std::make_index_sequence<Indices::cached_indices.size()>{}
            );
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_FILTER_HPP

/*! @file Defines `boost::hana::filter`. @copyright Louis Dionne 2013-2017 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_FILTER_HPP #define BOOST_HANA_FILTER_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr auto filter_t::operator()(Xs&& xs, Pred&& pred) const { using M = typename hana::tag_of::type; using Filter = BOOST_HANA_DISPATCH_IF(filter_impl, hana::MonadPlus::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::MonadPlus::value, "hana::filter(xs, pred) requires 'xs' to be a MonadPlus"); #endif return Filter::apply(static_cast(xs), static_cast(pred)); } //! @endcond namespace detail { template struct lift_or_empty { template static constexpr auto helper(X&& x, hana::true_) { return hana::lift(static_cast(x)); } template static constexpr auto helper(X&&, hana::false_) { return hana::empty(); } template constexpr auto operator()(X&& x) const { constexpr bool cond = decltype(std::declval()(x))::value; return helper(static_cast(x), hana::bool_c); } }; } template struct filter_impl> : default_ { template static constexpr decltype(auto) apply(Xs&& xs, Pred const&) { return hana::chain(static_cast(xs), detail::lift_or_empty{} ); } }; namespace detail { template struct filter_indices { static constexpr auto compute_indices() { constexpr bool bs[] = {b..., false}; // avoid empty array constexpr std::size_t N = detail::count(bs, bs + sizeof(bs), true); detail::array indices{}; std::size_t* keep = &indices[0]; for (std::size_t i = 0; i < sizeof...(b); ++i) if (bs[i]) *keep++ = i; return indices; } static constexpr auto cached_indices = compute_indices(); }; template struct make_filter_indices { Pred const& pred; template auto operator()(X&& ...x) const -> filter_indices< static_cast(detail::decay< decltype(pred(static_cast(x))) >::type::value)... > { return {}; } }; } template struct filter_impl::value>> { template static constexpr auto filter_helper(Xs&& xs, std::index_sequence) { return hana::make( hana::at_c(static_cast(xs))... ); } template static constexpr auto apply(Xs&& xs, Pred const& pred) { using Indices = decltype( hana::unpack(static_cast(xs), detail::make_filter_indices{pred}) ); return filter_impl::filter_helper( static_cast(xs), std::make_index_sequence{} ); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_FILTER_HPP