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

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

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+/*!
+@file
+Defines `boost::hana::repeat`.
+
+@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_REPEAT_HPP
+#define BOOST_HANA_REPEAT_HPP
+
+#include <boost/hana/fwd/repeat.hpp>
+
+#include <boost/hana/concept/integral_constant.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+
+#include <cstddef>
+#include <utility>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    template <typename I, bool condition>
+    struct repeat_impl<I, when<condition>> : default_ {
+        template <typename F, std::size_t ...i>
+        static constexpr void repeat_helper(F&& f, std::index_sequence<i...>) {
+            using Swallow = std::size_t[];
+            (void)Swallow{0, ((void)f(), i)...};
+        }
+
+        template <typename N, typename F>
+        static constexpr auto apply(N const&, F&& f) {
+            static_assert(N::value >= 0, "hana::repeat(n, f) requires 'n' to be non-negative");
+            constexpr std::size_t n = N::value;
+            repeat_helper(static_cast<F&&>(f), std::make_index_sequence<n>{});
+        }
+    };
+
+    //! @cond
+    template <typename N, typename F>
+    constexpr void repeat_t::operator()(N const& n, F&& f) const {
+        using I = typename hana::tag_of<N>::type;
+        using Repeat = BOOST_HANA_DISPATCH_IF(repeat_impl<I>,
+            hana::IntegralConstant<I>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::IntegralConstant<I>::value,
+        "hana::repeat(n, f) requires 'n' to be an IntegralConstant");
+    #endif
+
+        return Repeat::apply(n, static_cast<F&&>(f));
+    }
+    //! @endcond
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_REPEAT_HPP