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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back.hpp	1534	0644	edit dl rm
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bool.hpp	9747	0644	edit dl rm
cartesian_product.hpp	3860	0644	edit dl rm
chain.hpp	1488	0644	edit dl rm
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integral_constant.hpp	389	0644	edit dl rm
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lift.hpp	1500	0644	edit dl rm
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reverse_fold.hpp	1144	0644	edit dl rm
scan_left.hpp	5060	0644	edit dl rm
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second.hpp	1253	0644	edit dl rm
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zip_shortest.hpp	1604	0644	edit dl rm
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zip_with.hpp	2292	0644	edit dl rm

Edit: /usr/include/boost/hana/scan_left.hpp (5060B)

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

@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_SCAN_LEFT_HPP
#define BOOST_HANA_SCAN_LEFT_HPP

#include <boost/hana/fwd/scan_left.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/empty.hpp>
#include <boost/hana/length.hpp>
#include <boost/hana/prepend.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Xs, typename F>
    constexpr auto scan_left_t::operator()(Xs&& xs, F const& f) const {
        using S = typename hana::tag_of<Xs>::type;
        using ScanLeft = BOOST_HANA_DISPATCH_IF(scan_left_impl<S>,
            hana::Sequence<S>::value
        );

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

return ScanLeft::apply(static_cast<Xs&&>(xs), f);
    }

template <typename Xs, typename State, typename F>
    constexpr auto scan_left_t::operator()(Xs&& xs, State&& state, F const& f) const {
        using S = typename hana::tag_of<Xs>::type;
        using ScanLeft = BOOST_HANA_DISPATCH_IF(scan_left_impl<S>,
            hana::Sequence<S>::value
        );

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

return ScanLeft::apply(static_cast<Xs&&>(xs),
                               static_cast<State&&>(state), f);
    }
    //! @endcond

template <typename S, bool condition>
    struct scan_left_impl<S, when<condition>> : default_ {
        // Without initial state
        template <typename Xs, typename F, std::size_t n1, std::size_t n2, std::size_t ...ns>
        static constexpr auto
        apply1_impl(Xs&& xs, F const& f, std::index_sequence<n1, n2, ns...>) {
            static_assert(n1 == 0, "logic error in Boost.Hana: file a bug report");

// Use scan_left with the first element as an initial state.
            return scan_left_impl::apply_impl(
                static_cast<Xs&&>(xs),
                hana::at_c<0>(static_cast<Xs&&>(xs)),
                f, std::index_sequence<n2, ns...>{}
            );
        }

template <typename Xs, typename F, std::size_t n>
        static constexpr auto apply1_impl(Xs&& xs, F const&, std::index_sequence<n>) {
            return hana::make<S>(hana::at_c<n>(static_cast<Xs&&>(xs)));
        }

template <typename Xs, typename F>
        static constexpr auto apply1_impl(Xs&&, F const&, std::index_sequence<>) {
            return hana::empty<S>();
        }

template <typename Xs, typename F>
        static constexpr auto apply(Xs&& xs, F const& f) {
            constexpr std::size_t Len = decltype(hana::length(xs))::value;
            return scan_left_impl::apply1_impl(static_cast<Xs&&>(xs),
                                               f, std::make_index_sequence<Len>{});
        }

// With initial state
        template <typename Xs, typename State, typename F,
                  std::size_t n1, std::size_t n2, std::size_t ...ns>
        static constexpr auto
        apply_impl(Xs&& xs, State&& state, F const& f,
                   std::index_sequence<n1, n2, ns...>)
        {
            auto rest = scan_left_impl::apply_impl(
                                static_cast<Xs&&>(xs),
                                f(state, hana::at_c<n1>(static_cast<Xs&&>(xs))),
                                f, std::index_sequence<n2, ns...>{});
            return hana::prepend(std::move(rest), static_cast<State&&>(state));
        }

template <typename Xs, typename State, typename F, std::size_t n>
        static constexpr auto
        apply_impl(Xs&& xs, State&& state, F const& f, std::index_sequence<n>) {
            auto new_state = f(state, hana::at_c<n>(static_cast<Xs&&>(xs)));
            return hana::make<S>(static_cast<State&&>(state), std::move(new_state));
        }

template <typename Xs, typename State, typename F>
        static constexpr auto
        apply_impl(Xs&&, State&& state, F const&, std::index_sequence<>) {
            return hana::make<S>(static_cast<State&&>(state));
        }

template <typename Xs, typename State, typename F>
        static constexpr auto apply(Xs&& xs, State&& state, F const& f) {
            constexpr std::size_t Len = decltype(hana::length(xs))::value;
            return scan_left_impl::apply_impl(static_cast<Xs&&>(xs),
                                              static_cast<State&&>(state),
                                              f, std::make_index_sequence<Len>{});
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_SCAN_LEFT_HPP

/*! @file Defines `boost::hana::scan_left`. @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_SCAN_LEFT_HPP #define BOOST_HANA_SCAN_LEFT_HPP #include #include #include #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr auto scan_left_t::operator()(Xs&& xs, F const& f) const { using S = typename hana::tag_of::type; using ScanLeft = BOOST_HANA_DISPATCH_IF(scan_left_impl, hana::Sequence::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Sequence::value, "hana::scan_left(xs, f) requires 'xs' to be a Sequence"); #endif return ScanLeft::apply(static_cast(xs), f); } template constexpr auto scan_left_t::operator()(Xs&& xs, State&& state, F const& f) const { using S = typename hana::tag_of::type; using ScanLeft = BOOST_HANA_DISPATCH_IF(scan_left_impl, hana::Sequence::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Sequence::value, "hana::scan_left(xs, state, f) requires 'xs' to be a Sequence"); #endif return ScanLeft::apply(static_cast(xs), static_cast(state), f); } //! @endcond template struct scan_left_impl> : default_ { // Without initial state template static constexpr auto apply1_impl(Xs&& xs, F const& f, std::index_sequence) { static_assert(n1 == 0, "logic error in Boost.Hana: file a bug report"); // Use scan_left with the first element as an initial state. return scan_left_impl::apply_impl( static_cast(xs), hana::at_c<0>(static_cast(xs)), f, std::index_sequence{} ); } template static constexpr auto apply1_impl(Xs&& xs, F const&, std::index_sequence) { return hana::make(hana::at_c(static_cast(xs))); } template static constexpr auto apply1_impl(Xs&&, F const&, std::index_sequence<>) { return hana::empty(); } template static constexpr auto apply(Xs&& xs, F const& f) { constexpr std::size_t Len = decltype(hana::length(xs))::value; return scan_left_impl::apply1_impl(static_cast(xs), f, std::make_index_sequence{}); } // With initial state template static constexpr auto apply_impl(Xs&& xs, State&& state, F const& f, std::index_sequence) { auto rest = scan_left_impl::apply_impl( static_cast(xs), f(state, hana::at_c(static_cast(xs))), f, std::index_sequence{}); return hana::prepend(std::move(rest), static_cast(state)); } template static constexpr auto apply_impl(Xs&& xs, State&& state, F const& f, std::index_sequence) { auto new_state = f(state, hana::at_c(static_cast(xs))); return hana::make(static_cast(state), std::move(new_state)); } template static constexpr auto apply_impl(Xs&&, State&& state, F const&, std::index_sequence<>) { return hana::make(static_cast(state)); } template static constexpr auto apply(Xs&& xs, State&& state, F const& f) { constexpr std::size_t Len = decltype(hana::length(xs))::value; return scan_left_impl::apply_impl(static_cast(xs), static_cast(state), f, std::make_index_sequence{}); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_SCAN_LEFT_HPP