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

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

@@ -0,0 +1,46 @@
+/*!
+@file
+Forward declares `boost::hana::members`.
+
+@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_FWD_MEMBERS_HPP
+#define BOOST_HANA_FWD_MEMBERS_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Returns a `Sequence` containing the members of a `Struct`.
+    //! @ingroup group-Struct
+    //!
+    //! Given a `Struct` object, `members` returns a `Sequence` containing
+    //! all the members of the `Struct`, in the same order as their respective
+    //! accessor appears in the `accessors` sequence.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/members.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto members = [](auto&& object) {
+        return tag-dispatched;
+    };
+#else
+    template <typename S, typename = void>
+    struct members_impl : members_impl<S, when<true>> { };
+
+    struct members_t {
+        template <typename Object>
+        constexpr auto operator()(Object&& object) const;
+    };
+
+    constexpr members_t members{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_MEMBERS_HPP