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

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

@@ -0,0 +1,73 @@
+/*!
+@file
+Forward declares `boost::hana::contains` and `boost::hana::in`.
+
+@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_CONTAINS_HPP
+#define BOOST_HANA_FWD_CONTAINS_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+#include <boost/hana/functional/flip.hpp>
+#include <boost/hana/functional/infix.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Returns whether the key occurs in the structure.
+    //! @ingroup group-Searchable
+    //!
+    //! Given a `Searchable` structure `xs` and a `key`, `contains` returns
+    //! whether any of the keys of the structure is equal to the given `key`.
+    //! If the structure is not finite, an equal key has to appear at a finite
+    //! position in the structure for this method to finish. For convenience,
+    //! `contains` can also be applied in infix notation.
+    //!
+    //!
+    //! @param xs
+    //! The structure to search.
+    //!
+    //! @param key
+    //! A key to be searched for in the structure. The key has to be
+    //! `Comparable` with the other keys of the structure.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/contains.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto contains = [](auto&& xs, auto&& key) {
+        return tag-dispatched;
+    };
+#else
+    template <typename S, typename = void>
+    struct contains_impl : contains_impl<S, when<true>> { };
+
+    struct contains_t {
+        template <typename Xs, typename Key>
+        constexpr auto operator()(Xs&& xs, Key&& key) const;
+    };
+
+    constexpr auto contains = hana::infix(contains_t{});
+#endif
+
+    //! Return whether the key occurs in the structure.
+    //! @ingroup group-Searchable
+    //!
+    //! Specifically, this is equivalent to `contains`, except `in` takes its
+    //! arguments in reverse order. Like `contains`, `in` can also be applied
+    //! in infix notation for increased expressiveness. This function is not a
+    //! method that can be overriden; it is just a convenience function
+    //! provided with the concept.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/in.cpp
+    constexpr auto in = hana::infix(hana::flip(hana::contains));
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_CONTAINS_HPP