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

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

@@ -0,0 +1,70 @@
+/*!
+@file
+Forward declares `boost::hana::remove`.
+
+@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_HPP
+#define BOOST_HANA_FWD_REMOVE_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Remove all the elements of a monadic structure that are equal to some
+    //! value.
+    //! @ingroup group-MonadPlus
+    //!
+    //! Given a monadic structure `xs` and a `value`, `remove` returns a new
+    //! monadic structure equal to `xs` without all its elements that are
+    //! equal to the given `value`. `remove` is equivalent to `remove_if`
+    //! with the `equal.to(value)` predicate, i.e.
+    //! @code
+    //!     remove(xs, value) == remove_if(xs, equal.to(value))
+    //! @endcode
+    //!
+    //!
+    //! Signature
+    //! ---------
+    //! Given a MonadPlus `M` and a value of type `T`, the signature is
+    //! \f$
+    //!     \mathrm{remove} : M(T) \times T \to M(T)
+    //! \f$
+    //!
+    //! @param xs
+    //! A monadic structure to remove some elements from.
+    //!
+    //! @param value
+    //! A value that is compared to every element `x` of the structure.
+    //! Elements of the structure that are equal to that value are removed
+    //! from the structure. This requires every element to be Comparable
+    //! with `value`. Furthermore, in the current version of the library,
+    //! comparing `value` with any element of the structure must yield a
+    //! compile-time Logical.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/remove.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto remove = [](auto&& xs, auto&& value) {
+        return tag-dispatched;
+    };
+#else
+    template <typename M, typename = void>
+    struct remove_impl : remove_impl<M, when<true>> { };
+
+    struct remove_t {
+        template <typename Xs, typename Value>
+        constexpr auto operator()(Xs&& xs, Value&& value) const;
+    };
+
+    constexpr remove_t remove{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_REMOVE_HPP