Added thirdparty: boost library

2026-08-19 21:58:10 +00:00 · 2024-01-06 19:55:56 +02:00
parent bf49f439e1
commit bccd1e7051
15683 changed files with 3239840 additions and 0 deletions
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+/*!
+@file
+Defines `boost::hana::detail::variadic::drop_into`.
+
+Copyright Louis Dionne 2013-2022
+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_DETAIL_VARIADIC_DROP_INTO_HPP
+#define BOOST_HANA_DETAIL_VARIADIC_DROP_INTO_HPP
+
+#include <boost/hana/config.hpp>
+
+#include <cstddef>
+#include <utility>
+
+
+namespace boost { namespace hana { namespace detail { namespace variadic {
+    template <std::size_t n, typename F, typename = std::make_index_sequence<n>>
+    struct dropper;
+
+    template <std::size_t n, typename F, std::size_t ...ignore>
+    struct dropper<n, F, std::index_sequence<ignore...>> {
+        F f;
+
+        template <typename ...Rest>
+        constexpr auto go(decltype(ignore, (void*)0)..., Rest ...rest) const
+        { return f(*rest...); }
+
+        template <typename ...Xs>
+        constexpr auto operator()(Xs ...xs) const
+        { return go(&xs...); }
+    };
+
+    template <std::size_t n>
+    struct make_dropper {
+        template <typename F>
+        constexpr auto operator()(F f) const
+        { return dropper<n, decltype(f)>{f}; }
+    };
+
+    template <std::size_t n>
+    BOOST_HANA_INLINE_VARIABLE constexpr make_dropper<n> drop_into{};
+}} }} // end namespace boost::hana
+
+#endif // !BOOST_HANA_DETAIL_VARIADIC_DROP_INTO_HPP