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 +1,131 @@
+/*!
+@file
+Defines `boost::hana::monadic_fold_right`.
+
+@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_MONADIC_FOLD_RIGHT_HPP
+#define BOOST_HANA_MONADIC_FOLD_RIGHT_HPP
+
+#include <boost/hana/fwd/monadic_fold_right.hpp>
+
+#include <boost/hana/chain.hpp>
+#include <boost/hana/concept/foldable.hpp>
+#include <boost/hana/concept/monad.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/detail/decay.hpp>
+#include <boost/hana/fold_left.hpp>
+#include <boost/hana/functional/curry.hpp>
+#include <boost/hana/functional/partial.hpp>
+#include <boost/hana/lift.hpp>
+
+#include <type_traits>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    template <typename M>
+    struct monadic_fold_right_t {
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Monad<M>::value,
+        "hana::monadic_fold_right<M> requires 'M' to be a Monad");
+    #endif
+
+        template <typename Xs, typename State, typename F>
+        constexpr decltype(auto) operator()(Xs&& xs, State&& state, F&& f) const {
+            using S = typename hana::tag_of<Xs>::type;
+            using MonadicFoldRight = BOOST_HANA_DISPATCH_IF(monadic_fold_right_impl<S>,
+                hana::Foldable<S>::value
+            );
+
+        #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+            static_assert(hana::Foldable<S>::value,
+            "hana::monadic_fold_right<M>(xs, state, f) requires 'xs' to be Foldable");
+        #endif
+
+            return MonadicFoldRight::template apply<M>(static_cast<Xs&&>(xs),
+                                                       static_cast<State&&>(state),
+                                                       static_cast<F&&>(f));
+        }
+
+        template <typename Xs, typename F>
+        constexpr decltype(auto) operator()(Xs&& xs, F&& f) const {
+            using S = typename hana::tag_of<Xs>::type;
+            using MonadicFoldRight = BOOST_HANA_DISPATCH_IF(monadic_fold_right_impl<S>,
+                hana::Foldable<S>::value
+            );
+
+        #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+            static_assert(hana::Foldable<S>::value,
+            "hana::monadic_fold_right<M>(xs, f) requires 'xs' to be Foldable");
+        #endif
+            return MonadicFoldRight::template apply<M>(static_cast<Xs&&>(xs),
+                                                       static_cast<F&&>(f));
+        }
+    };
+
+    namespace detail {
+        struct foldrM_helper {
+            template <typename F, typename K, typename X, typename Z>
+            constexpr decltype(auto) operator()(F&& f, K&& k, X&& x, Z&& z) const {
+                return hana::chain(
+                    static_cast<F&&>(f)(
+                        static_cast<X&&>(x),
+                        static_cast<Z&&>(z)
+                    ),
+                    static_cast<K&&>(k)
+                );
+            }
+        };
+
+        template <typename End, typename M, typename F>
+        struct monadic_foldr1_helper {
+            F f;
+            template <typename X, typename Y>
+            constexpr decltype(auto) operator()(X&& x, Y&& y) const
+            { return f(static_cast<X&&>(x), static_cast<Y&&>(y)); }
+            template <typename X>
+            constexpr decltype(auto) operator()(X&& x, End) const
+            { return hana::lift<M>(static_cast<X&&>(x)); }
+        };
+    }
+
+    template <typename T, bool condition>
+    struct monadic_fold_right_impl<T, when<condition>> : default_ {
+        // with state
+        template <typename M, typename Xs, typename S, typename F>
+        static constexpr decltype(auto) apply(Xs&& xs, S&& s, F&& f) {
+            return hana::fold_left(
+                static_cast<Xs&&>(xs),
+                hana::lift<M>,
+                hana::curry<3>(hana::partial(
+                    detail::foldrM_helper{}, static_cast<F&&>(f)
+                ))
+            )(static_cast<S&&>(s));
+        }
+
+        // without state
+        template <typename M, typename Xs, typename F>
+        static constexpr decltype(auto) apply(Xs&& xs, F&& f) {
+            struct end { };
+            using G = detail::monadic_foldr1_helper<end, M, typename detail::decay<F>::type>;
+            decltype(auto) result = hana::monadic_fold_right<M>(
+                static_cast<Xs&&>(xs),
+                end{},
+                G{static_cast<F&&>(f)}
+            );
+
+            static_assert(!std::is_same<
+                std::remove_reference_t<decltype(result)>,
+                decltype(hana::lift<M>(end{}))
+            >{},
+            "hana::monadic_fold_right<M>(xs, f) requires 'xs' to be non-empty");
+            return result;
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_MONADIC_FOLD_RIGHT_HPP