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

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

@@ -0,0 +1,57 @@
+/*!
+@file
+Forward declares `boost::hana::transform`.
+
+@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_TRANSFORM_HPP
+#define BOOST_HANA_FWD_TRANSFORM_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Map a function over a `Functor`.
+    //! @ingroup group-Functor
+    //!
+    //!
+    //! Signature
+    //! ---------
+    //! Given `F` a Functor, the signature is
+    //! \f$
+    //!     \mathtt{transform} : F(T) \times (T \to U) \to F(U)
+    //! \f$
+    //!
+    //! @param xs
+    //! The structure to map `f` over.
+    //!
+    //! @param f
+    //! A function called as `f(x)` on element(s) `x` of the structure,
+    //! and returning a new value to replace `x` in the structure.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/transform.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto transform = [](auto&& xs, auto&& f) {
+        return tag-dispatched;
+    };
+#else
+    template <typename Xs, typename = void>
+    struct transform_impl : transform_impl<Xs, when<true>> { };
+
+    struct transform_t {
+        template <typename Xs, typename F>
+        constexpr auto operator()(Xs&& xs, F&& f) const;
+    };
+
+    constexpr transform_t transform{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_TRANSFORM_HPP