Imported Upstream version 1.61.0

Change-Id: I96a1f878d1e6164f01e9aadd5147f38fca448d90
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/boost/hana/scan_right.hpp b/boost/hana/scan_right.hpp
new file mode 100644
index 0000000000..3a8a11d435
--- /dev/null
+++ b/boost/hana/scan_right.hpp
@@ -0,0 +1,130 @@
+/*!
+@file
+Defines `boost::hana::scan_right`.
+
+@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_SCAN_RIGHT_HPP
+#define BOOST_HANA_SCAN_RIGHT_HPP
+
+#include <boost/hana/fwd/scan_right.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/front.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_right_t::operator()(Xs&& xs, F const& f) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using ScanRight = BOOST_HANA_DISPATCH_IF(scan_right_impl<S>,
+            hana::Sequence<S>::value
+        );
+
+#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Sequence<S>::value,
+        "hana::scan_right(xs, f) requires 'xs' to be a Sequence");
+#endif
+
+        return ScanRight::apply(static_cast<Xs&&>(xs), f);
+    }
+
+    template <typename Xs, typename State, typename F>
+    constexpr auto scan_right_t::operator()(Xs&& xs, State&& state, F const& f) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using ScanRight = BOOST_HANA_DISPATCH_IF(scan_right_impl<S>,
+            hana::Sequence<S>::value
+        );
+
+#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Sequence<S>::value,
+        "hana::scan_right(xs, state, f) requires 'xs' to be a Sequence");
+#endif
+
+        return ScanRight::apply(static_cast<Xs&&>(xs),
+                                static_cast<State&&>(state), f);
+    }
+    //! @endcond
+
+    template <typename S, bool condition>
+    struct scan_right_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...>) {
+            auto rest = scan_right_impl::apply1_impl(static_cast<Xs&&>(xs),
+                                                     f, std::index_sequence<n2, ns...>{});
+            auto element = f(hana::at_c<n1>(static_cast<Xs&&>(xs)), hana::front(rest));
+            return hana::prepend(std::move(rest), std::move(element));
+        }
+
+        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_right_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_right_impl::apply_impl(static_cast<Xs&&>(xs),
+                                                    static_cast<State&&>(state),
+                                                    f, std::index_sequence<n2, ns...>{});
+            auto element = f(hana::at_c<n1>(static_cast<Xs&&>(xs)), hana::front(rest));
+            return hana::prepend(std::move(rest), std::move(element));
+        }
+
+        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 element = f(hana::at_c<n>(static_cast<Xs&&>(xs)), state);
+            return hana::make<S>(std::move(element), static_cast<State&&>(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_right_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_RIGHT_HPP