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

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

@@ -0,0 +1,82 @@
+/*!
+@file
+Forward declares `boost::hana::remove_at` and `boost::hana::remove_at_c`.
+
+@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_REMOVE_AT_HPP
+#define BOOST_HANA_FWD_REMOVE_AT_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+
+#include <cstddef>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Remove the element at a given index from a sequence.
+    //! @ingroup group-Sequence
+    //!
+    //! `remove_at` returns a new sequence identical to the original, except
+    //! that the element at the given index is removed. Specifically,
+    //! `remove_at([x0, ..., xn-1, xn, xn+1, ..., xm], n)` is a new
+    //! sequence equivalent to `[x0, ..., xn-1, xn+1, ..., xm]`.
+    //!
+    //! @note
+    //! The behavior is undefined if the index is out of the bounds of the
+    //! sequence.
+    //!
+    //!
+    //! @param xs
+    //! A sequence from which an element is to be removed.
+    //!
+    //! @param n
+    //! An non-negative `IntegralConstant` representing the index of the
+    //! element to be removed from the sequence. The behavior is undefined
+    //! if that index is not in the bounds of the sequence.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/remove_at.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto remove_at = [](auto&& xs, auto const& n) {
+        return tag-dispatched;
+    };
+#else
+    template <typename S, typename = void>
+    struct remove_at_impl : remove_at_impl<S, when<true>> { };
+
+    struct remove_at_t {
+        template <typename Xs, typename N>
+        constexpr auto operator()(Xs&& xs, N const& n) const;
+    };
+
+    constexpr remove_at_t remove_at{};
+#endif
+
+    //! Equivalent to `remove_at`; provided for convenience.
+    //! @ingroup group-Sequence
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/remove_at_c.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    template <std::size_t n>
+    constexpr auto remove_at_c = [](auto&& xs) {
+        return hana::remove_at(forwarded(xs), hana::size_c<n>);
+    };
+#else
+    template <std::size_t n>
+    struct remove_at_c_t;
+
+    template <std::size_t n>
+    constexpr remove_at_c_t<n> remove_at_c{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_REMOVE_AT_HPP