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

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

@@ -0,0 +1,81 @@
+/*!
+@file
+Forward declares `boost::hana::partition`.
+
+@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_PARTITION_HPP
+#define BOOST_HANA_FWD_PARTITION_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+#include <boost/hana/detail/nested_by_fwd.hpp>
+
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Partition a sequence based on a `predicate`.
+    //! @ingroup group-Sequence
+    //!
+    //! Specifically, returns an unspecified `Product` whose first element is
+    //! a sequence of the elements satisfying the predicate, and whose second
+    //! element is a sequence of the elements that do not satisfy the predicate.
+    //!
+    //!
+    //! Signature
+    //! ---------
+    //! Given a Sequence `S(T)`, an `IntegralConstant` `Bool` holding a value
+    //! of type `bool`, and a predicate \f$ T \to Bool \f$, `partition` has
+    //! the following signature:
+    //! \f[
+    //!     \mathtt{partition} : S(T) \times (T \to Bool) \to S(T) \times S(T)
+    //! \f]
+    //!
+    //! @param xs
+    //! The sequence to be partitioned.
+    //!
+    //! @param predicate
+    //! A function called as `predicate(x)` for each element `x` in the
+    //! sequence, and returning whether `x` should be added to the sequence
+    //! in the first component or in the second component of the resulting
+    //! pair. In the current version of the library, `predicate` must return
+    //! an `IntegralConstant` holding a value convertible to `bool`.
+    //!
+    //!
+    //! Syntactic sugar (`partition.by`)
+    //! --------------------------------
+    //! `partition` can be called in an alternate way, which provides a nice
+    //! syntax in some cases where the predicate is short:
+    //! @code
+    //!     partition.by(predicate, xs) == partition(xs, predicate)
+    //!     partition.by(predicate) == partition(-, predicate)
+    //! @endcode
+    //!
+    //! where `partition(-, predicate)` denotes the partial application of
+    //! `partition` to `predicate`.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/partition.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto partition = [](auto&& xs, auto&& predicate) {
+        return tag-dispatched;
+    };
+#else
+    template <typename S, typename = void>
+    struct partition_impl : partition_impl<S, when<true>> { };
+
+    struct partition_t : detail::nested_by<partition_t> {
+        template <typename Xs, typename Pred>
+        constexpr auto operator()(Xs&& xs, Pred&& pred) const;
+    };
+
+    constexpr partition_t partition{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_PARTITION_HPP