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 +1,97 @@
+/*!
+@file
+Defines `boost::hana::maximum`.
+
+@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_MAXIMUM_HPP
+#define BOOST_HANA_MAXIMUM_HPP
+
+#include <boost/hana/fwd/maximum.hpp>
+
+#include <boost/hana/concept/foldable.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/detail/nested_by.hpp> // required by fwd decl
+#include <boost/hana/fold_left.hpp>
+#include <boost/hana/if.hpp>
+#include <boost/hana/less.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Xs>
+    constexpr decltype(auto) maximum_t::operator()(Xs&& xs) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using Maximum = BOOST_HANA_DISPATCH_IF(maximum_impl<S>,
+            hana::Foldable<S>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Foldable<S>::value,
+        "hana::maximum(xs) requires 'xs' to be Foldable");
+    #endif
+
+        return Maximum::apply(static_cast<Xs&&>(xs));
+    }
+
+    template <typename Xs, typename Predicate>
+    constexpr decltype(auto) maximum_t::operator()(Xs&& xs, Predicate&& pred) const {
+        using S = typename hana::tag_of<Xs>::type;
+        using Maximum = BOOST_HANA_DISPATCH_IF(maximum_pred_impl<S>,
+            hana::Foldable<S>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Foldable<S>::value,
+        "hana::maximum(xs, predicate) requires 'xs' to be Foldable");
+    #endif
+
+        return Maximum::apply(static_cast<Xs&&>(xs),
+                              static_cast<Predicate&&>(pred));
+    }
+    //! @endcond
+
+    //////////////////////////////////////////////////////////////////////////
+    // maximum (with a custom predicate)
+    //////////////////////////////////////////////////////////////////////////
+    namespace detail {
+        template <typename Pred>
+        struct max_by {
+            Pred pred;
+
+            template <typename X, typename Y>
+            constexpr decltype(auto) operator()(X&& x, Y&& y) const {
+                auto result = (*pred)(x, y);
+                return hana::if_(result, static_cast<Y&&>(y),
+                                         static_cast<X&&>(x));
+            }
+        };
+    }
+
+    template <typename T, bool condition>
+    struct maximum_pred_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::fold_left(static_cast<Xs&&>(xs),
+                detail::max_by<decltype(&pred)>{&pred}
+            );
+        }
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // maximum (without a custom predicate)
+    //////////////////////////////////////////////////////////////////////////
+    template <typename T, bool condition>
+    struct maximum_impl<T, when<condition>> : default_ {
+        template <typename Xs>
+        static constexpr decltype(auto) apply(Xs&& xs)
+        { return hana::maximum(static_cast<Xs&&>(xs), hana::less); }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_MAXIMUM_HPP