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 +1,92 @@
+/*!
+@file
+Defines `boost::hana::count_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_COUNT_IF_HPP
+#define BOOST_HANA_COUNT_IF_HPP
+
+#include <boost/hana/fwd/count_if.hpp>
+
+#include <boost/hana/concept/foldable.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/detail/algorithm.hpp>
+#include <boost/hana/detail/fast_and.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/unpack.hpp>
+
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Xs, typename Pred>
+    constexpr auto count_if_t::operator()(Xs&& xs, Pred&& pred) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using CountIf = BOOST_HANA_DISPATCH_IF(count_if_impl<S>,
+            hana::Foldable<S>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Foldable<S>::value,
+        "hana::count_if(xs, pred) requires 'xs' to be Foldable");
+    #endif
+
+        return CountIf::apply(static_cast<Xs&&>(xs),
+                              static_cast<Pred&&>(pred));
+    }
+    //! @endcond
+
+    namespace detail {
+        template <typename Pred>
+        struct count_pred {
+            Pred pred;
+            template <typename ...Xs, typename = typename std::enable_if<
+                detail::fast_and<
+                    Constant<decltype((*pred)(std::declval<Xs&&>()))>::value...
+                >::value
+            >::type>
+            constexpr auto operator()(Xs&& ...xs) const {
+                constexpr bool results[] = {false, // <-- avoid empty array
+                    static_cast<bool>(hana::value<decltype((*pred)(static_cast<Xs&&>(xs)))>())...
+                };
+                constexpr std::size_t total = detail::count(
+                    results, results + sizeof(results), true
+                );
+                return hana::size_c<total>;
+            }
+
+            template <typename ...Xs, typename = void, typename = typename std::enable_if<
+                !detail::fast_and<
+                    Constant<decltype((*pred)(std::declval<Xs&&>()))>::value...
+                >::value
+            >::type>
+            constexpr auto operator()(Xs&& ...xs) const {
+                std::size_t total = 0;
+                using Swallow = std::size_t[];
+                (void)Swallow{0, ((*pred)(static_cast<Xs&&>(xs)) ? ++total : 0)...};
+                return total;
+            }
+        };
+    }
+
+    template <typename T, bool condition>
+    struct count_if_impl<T, when<condition>> : default_ {
+        template <typename Xs, typename Pred>
+        static constexpr decltype(auto) apply(Xs&& xs, Pred&& pred) {
+            // We use a pointer instead of a reference to avoid a Clang ICE.
+            return hana::unpack(static_cast<Xs&&>(xs),
+                detail::count_pred<decltype(&pred)>{&pred}
+            );
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_COUNT_IF_HPP