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

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

@@ -0,0 +1,63 @@
+/*!
+@file
+Forward declares `boost::hana::replace_if`.
+
+@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_REPLACE_IF_HPP
+#define BOOST_HANA_FWD_REPLACE_IF_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! Replace all the elements of a structure satisfying a `predicate`
+    //! with a fixed value.
+    //! @ingroup group-Functor
+    //!
+    //!
+    //! Signature
+    //! ---------
+    //! Given `F` a Functor and `Bool` a Logical, the signature is
+    //! \f$
+    //!     \mathtt{replace_if} : F(T) \times (T \to Bool) \times T \to F(T)
+    //! \f$
+    //!
+    //! @param xs
+    //! The structure to replace elements of.
+    //!
+    //! @param predicate
+    //! A function called as `predicate(x)` for element(s) `x` of the
+    //! structure and returning a `Logical` representing whether `x`
+    //! should be replaced by `value`.
+    //!
+    //! @param value
+    //! A value by which every element `x` of the structure for which
+    //! `predicate` returns a true-valued `Logical` is replaced.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/replace_if.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto replace_if = [](auto&& xs, auto&& predicate, auto&& value) {
+        return tag-dispatched;
+    };
+#else
+    template <typename Xs, typename = void>
+    struct replace_if_impl : replace_if_impl<Xs, when<true>> { };
+
+    struct replace_if_t {
+        template <typename Xs, typename Pred, typename Value>
+        constexpr auto operator()(Xs&& xs, Pred&& pred, Value&& value) const;
+    };
+
+    constexpr replace_if_t replace_if{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_REPLACE_IF_HPP