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

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

@@ -0,0 +1,70 @@
+/*!
+@file
+Forward declares `boost::hana::not_equal`.
+
+@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_NOT_EQUAL_HPP
+#define BOOST_HANA_FWD_NOT_EQUAL_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+#include <boost/hana/detail/nested_to_fwd.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Returns a `Logical` representing whether `x` is not equal to `y`.
+    //! @ingroup group-Comparable
+    //!
+    //! The `not_equal` function can be called in two different ways. First,
+    //! it can be called like a normal function:
+    //! @code
+    //!     not_equal(x, y)
+    //! @endcode
+    //!
+    //! However, it may also be partially applied to an argument by using
+    //! `not_equal.to`:
+    //! @code
+    //!     not_equal.to(x)(y) == not_equal(x, y)
+    //! @endcode
+    //!
+    //! In other words, `not_equal.to(x)` is a function object that is
+    //! equivalent to `partial(not_equal, x)`. This is provided to enhance
+    //! the readability of some constructs, especially when using higher
+    //! order algorithms.
+    //!
+    //!
+    //! Signature
+    //! ---------
+    //! Given a Logical `Bool` and two Comparables `A` and `B` that
+    //! share a common embedding, the signature is
+    //! @f$ \mathtt{not\_equal} : A \times B \to Bool @f$.
+    //!
+    //! @param x, y
+    //! Two objects to compare for inequality.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/not_equal.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto not_equal = [](auto&& x, auto&& y) {
+        return tag-dispatched;
+    };
+#else
+    template <typename T, typename U, typename = void>
+    struct not_equal_impl : not_equal_impl<T, U, when<true>> { };
+
+    struct not_equal_t : detail::nested_to<not_equal_t> {
+        template <typename X, typename Y>
+        constexpr auto operator()(X&& x, Y&& y) const;
+    };
+
+    constexpr not_equal_t not_equal{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_NOT_EQUAL_HPP