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

2026-02-24 18:38:47 +00:00
parent da8c28aaeb
commit 65cb2619a7
13106 changed files with 2484322 additions and 1804 deletions
@@ -0,0 +1,75 @@
+/*!
+@file
+Defines `boost::hana::span`.
+
+@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_SPAN_HPP
+#define BOOST_HANA_SPAN_HPP
+
+#include <boost/hana/fwd/span.hpp>
+
+#include <boost/hana/at.hpp>
+#include <boost/hana/concept/sequence.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/core/make.hpp>
+#include <boost/hana/detail/nested_by.hpp> // required by fwd decl
+#include <boost/hana/detail/first_unsatisfied_index.hpp>
+#include <boost/hana/length.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/unpack.hpp>
+
+#include <cstddef>
+#include <utility>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Xs, typename Pred>
+    constexpr auto span_t::operator()(Xs&& xs, Pred&& pred) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using Span = BOOST_HANA_DISPATCH_IF(span_impl<S>,
+            hana::Sequence<S>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Sequence<S>::value,
+        "hana::span(xs, pred) requires 'xs' to be a Sequence");
+    #endif
+
+        return Span::apply(static_cast<Xs&&>(xs), static_cast<Pred&&>(pred));
+    }
+    //! @endcond
+
+    template <typename S, bool condition>
+    struct span_impl<S, when<condition>> : default_ {
+        template <typename Xs, std::size_t ...before, std::size_t ...after>
+        static constexpr auto span_helper(Xs&& xs, std::index_sequence<before...>,
+                                                   std::index_sequence<after...>)
+        {
+            return hana::make_pair(
+                hana::make<S>(hana::at_c<before>(static_cast<Xs&&>(xs))...),
+                hana::make<S>(hana::at_c<sizeof...(before) + after>(static_cast<Xs&&>(xs))...)
+            );
+        }
+
+        template <typename Xs, typename Pred>
+        static constexpr auto apply(Xs&& xs, Pred&&) {
+            using FirstUnsatisfied = decltype(
+                hana::unpack(static_cast<Xs&&>(xs),
+                             detail::first_unsatisfied_index<Pred&&>{})
+            );
+            constexpr std::size_t breakpoint = FirstUnsatisfied::value;
+            constexpr std::size_t N = decltype(hana::length(xs))::value;
+            return span_helper(static_cast<Xs&&>(xs),
+                               std::make_index_sequence<breakpoint>{},
+                               std::make_index_sequence<N - breakpoint>{});
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_SPAN_HPP