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 +1,93 @@
+/*!
+@file
+Defines `boost::hana::drop_while`.
+
+@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_DROP_WHILE_HPP
+#define BOOST_HANA_DROP_WHILE_HPP
+
+#include <boost/hana/fwd/drop_while.hpp>
+
+#include <boost/hana/concept/foldable.hpp>
+#include <boost/hana/concept/iterable.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/detail/first_unsatisfied_index.hpp>
+#include <boost/hana/drop_front.hpp>
+#include <boost/hana/eval_if.hpp>
+#include <boost/hana/front.hpp>
+#include <boost/hana/is_empty.hpp>
+#include <boost/hana/lazy.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Xs, typename Pred>
+    constexpr auto drop_while_t::operator()(Xs&& xs, Pred&& pred) const {
+        using It = typename hana::tag_of<Xs>::type;
+        using DropWhile = BOOST_HANA_DISPATCH_IF(drop_while_impl<It>,
+            hana::Iterable<It>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Iterable<It>::value,
+        "hana::drop_while(xs, pred) requires 'xs' to be an Iterable");
+    #endif
+
+        return DropWhile::apply(static_cast<Xs&&>(xs), static_cast<Pred&&>(pred));
+    }
+    //! @endcond
+
+    namespace iterable_detail {
+        struct drop_while_helper {
+            struct next {
+                template <typename Xs, typename Pred>
+                constexpr decltype(auto) operator()(Xs&& xs, Pred&& pred) const {
+                    return hana::drop_while(
+                        hana::drop_front(static_cast<Xs&&>(xs)),
+                        static_cast<Pred&&>(pred)
+                    );
+                }
+            };
+
+            template <typename Xs, typename Pred>
+            constexpr decltype(auto) operator()(Xs&& xs, Pred&& pred) const {
+                return hana::eval_if(pred(hana::front(xs)),
+                    hana::make_lazy(next{})(xs, pred),
+                    hana::make_lazy(xs)
+                );
+            }
+        };
+    }
+
+    template <typename It, bool condition>
+    struct drop_while_impl<It, when<condition>> : default_ {
+        template <typename Xs, typename Pred>
+        static constexpr auto apply(Xs&& xs, Pred&& pred) {
+            return hana::eval_if(hana::is_empty(xs),
+                hana::make_lazy(xs),
+                hana::make_lazy(iterable_detail::drop_while_helper{})(
+                                            xs, static_cast<Pred&&>(pred))
+            );
+        }
+    };
+
+    template <typename S>
+    struct drop_while_impl<S, when<hana::Foldable<S>::value>> {
+        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&&>{})
+            );
+            return hana::drop_front(static_cast<Xs&&>(xs),
+                                    FirstUnsatisfied{});
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_DROP_WHILE_HPP