stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork

depends/x86_64-pc-linux-gnu/include/boost/hana/reverse.hpp

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+/*!
+@file
+Defines `boost::hana::reverse`.
+
+@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_REVERSE_HPP
+#define BOOST_HANA_REVERSE_HPP
+
+#include <boost/hana/fwd/reverse.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/length.hpp>
+
+#include <cstddef>
+#include <utility>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Xs>
+    constexpr auto reverse_t::operator()(Xs&& xs) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using Reverse = BOOST_HANA_DISPATCH_IF(reverse_impl<S>,
+            hana::Sequence<S>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Sequence<S>::value,
+        "hana::reverse(xs) requires 'xs' to be a Sequence");
+    #endif
+
+        return Reverse::apply(static_cast<Xs&&>(xs));
+    }
+    //! @endcond
+
+    template <typename S, bool condition>
+    struct reverse_impl<S, when<condition>> : default_ {
+        template <typename Xs, std::size_t ...i>
+        static constexpr auto reverse_helper(Xs&& xs, std::index_sequence<i...>) {
+            return hana::make<S>(
+                hana::at_c<sizeof...(i) - i - 1>(static_cast<Xs&&>(xs))...
+            );
+        }
+
+        template <typename Xs>
+        static constexpr auto apply(Xs&& xs) {
+            constexpr std::size_t N = decltype(hana::length(xs))::value;
+            return reverse_helper(static_cast<Xs&&>(xs), std::make_index_sequence<N>{});
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_REVERSE_HPP