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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bool.hpp	9747	0644	edit dl rm
cartesian_product.hpp	3860	0644	edit dl rm
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integral_constant.hpp	389	0644	edit dl rm
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partition.hpp	4199	0644	edit dl rm
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zip_with.hpp	2292	0644	edit dl rm

Edit: /usr/include/boost/hana/partition.hpp (4199B)

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

@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_PARTITION_HPP
#define BOOST_HANA_PARTITION_HPP

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

#include <boost/hana/at.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/detail/nested_by.hpp> // required by fwd decl
#include <boost/hana/pair.hpp>
#include <boost/hana/unpack.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Xs, typename Pred>
    constexpr auto partition_t::operator()(Xs&& xs, Pred&& pred) const {
        using S = typename hana::tag_of<Xs>::type;
        using Partition = BOOST_HANA_DISPATCH_IF(partition_impl<S>,
            hana::Sequence<S>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Sequence<S>::value,
        "hana::partition(xs, pred) requires 'xs' to be a Sequence");
    #endif

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

namespace detail {
        template <bool ...B>
        struct partition_indices {
            static constexpr detail::array<bool, sizeof...(B)> results{{B...}};
            static constexpr std::size_t left_size =
                detail::count(results.begin(), results.end(), true);
            static constexpr std::size_t right_size = sizeof...(B) - left_size;

static constexpr auto compute_left() {
                detail::array<std::size_t, left_size> indices{};
                std::size_t* left = &indices[0];
                for (std::size_t i = 0; i < sizeof...(B); ++i)
                    if (results[i])
                        *left++ = i;
                return indices;
            }

static constexpr auto compute_right() {
                detail::array<std::size_t, right_size> indices{};
                std::size_t* right = &indices[0];
                for (std::size_t i = 0; i < sizeof...(B); ++i)
                    if (!results[i])
                        *right++ = i;
                return indices;
            }

static constexpr auto left_indices = compute_left();
            static constexpr auto right_indices = compute_right();

template <typename S, typename Xs, std::size_t ...l, std::size_t ...r>
            static constexpr auto apply(Xs&& xs, std::index_sequence<l...>,
                                                 std::index_sequence<r...>)
            {
                return hana::make<hana::pair_tag>(
                    hana::make<S>(hana::at_c<left_indices[l]>(static_cast<Xs&&>(xs))...),
                    hana::make<S>(hana::at_c<right_indices[r]>(static_cast<Xs&&>(xs))...)
                );
            }
        };

template <typename Pred>
        struct deduce_partition_indices {
            template <typename ...Xs>
            auto operator()(Xs&& ...xs) const -> detail::partition_indices<
                static_cast<bool>(detail::decay<
                    decltype(std::declval<Pred>()(static_cast<Xs&&>(xs)))
                >::type::value)...
            > { return {}; }
        };
    }

template <typename S, bool condition>
    struct partition_impl<S, when<condition>> : default_ {
        template <typename Xs, typename Pred>
        static constexpr auto apply(Xs&& xs, Pred&&) {
            using Indices = decltype(hana::unpack(
                static_cast<Xs&&>(xs), detail::deduce_partition_indices<Pred&&>{}
            ));
            return Indices::template apply<S>(
                static_cast<Xs&&>(xs),
                std::make_index_sequence<Indices::left_size>{},
                std::make_index_sequence<Indices::right_size>{}
            );
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_PARTITION_HPP

/*! @file Defines `boost::hana::partition`. @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_PARTITION_HPP #define BOOST_HANA_PARTITION_HPP #include #include #include #include #include #include #include #include #include #include // required by fwd decl #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr auto partition_t::operator()(Xs&& xs, Pred&& pred) const { using S = typename hana::tag_of::type; using Partition = BOOST_HANA_DISPATCH_IF(partition_impl, hana::Sequence::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Sequence::value, "hana::partition(xs, pred) requires 'xs' to be a Sequence"); #endif return Partition::apply(static_cast(xs), static_cast(pred)); } //! @endcond namespace detail { template struct partition_indices { static constexpr detail::array results{{B...}}; static constexpr std::size_t left_size = detail::count(results.begin(), results.end(), true); static constexpr std::size_t right_size = sizeof...(B) - left_size; static constexpr auto compute_left() { detail::array indices{}; std::size_t* left = &indices[0]; for (std::size_t i = 0; i < sizeof...(B); ++i) if (results[i]) *left++ = i; return indices; } static constexpr auto compute_right() { detail::array indices{}; std::size_t* right = &indices[0]; for (std::size_t i = 0; i < sizeof...(B); ++i) if (!results[i]) *right++ = i; return indices; } static constexpr auto left_indices = compute_left(); static constexpr auto right_indices = compute_right(); template static constexpr auto apply(Xs&& xs, std::index_sequence, std::index_sequence) { return hana::make( hana::make(hana::at_c(static_cast(xs))...), hana::make(hana::at_c(static_cast(xs))...) ); } }; template struct deduce_partition_indices { template auto operator()(Xs&& ...xs) const -> detail::partition_indices< static_cast(detail::decay< decltype(std::declval()(static_cast(xs))) >::type::value)... > { return {}; } }; } template struct partition_impl> : default_ { template static constexpr auto apply(Xs&& xs, Pred&&) { using Indices = decltype(hana::unpack( static_cast(xs), detail::deduce_partition_indices{} )); return Indices::template apply( static_cast(xs), std::make_index_sequence{}, std::make_index_sequence{} ); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_PARTITION_HPP