From 5068d34c08f951a7ea6257d305a1627b09a95817 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 4 May 2024 19:44:55 +0200
Subject: Adding upstream version 0.11.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../scnlib/include/scn/tuple_return/util.h         | 176 +++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 src/third-party/scnlib/include/scn/tuple_return/util.h

(limited to 'src/third-party/scnlib/include/scn/tuple_return/util.h')

diff --git a/src/third-party/scnlib/include/scn/tuple_return/util.h b/src/third-party/scnlib/include/scn/tuple_return/util.h
new file mode 100644
index 0000000..be0e2ab
--- /dev/null
+++ b/src/third-party/scnlib/include/scn/tuple_return/util.h
@@ -0,0 +1,176 @@
+// Copyright 2017 Elias Kosunen
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is a part of scnlib:
+//     https://github.com/eliaskosunen/scnlib
+
+#ifndef SCN_TUPLE_RETURN_UTIL_H
+#define SCN_TUPLE_RETURN_UTIL_H
+
+#include "../util/meta.h"
+
+#include <functional>
+#include <tuple>
+
+namespace scn {
+    SCN_BEGIN_NAMESPACE
+
+    namespace detail {
+        // From cppreference
+        template <typename Fn,
+                  typename... Args,
+                  typename std::enable_if<std::is_member_pointer<
+                      typename std::decay<Fn>::type>::value>::type* = nullptr,
+                  int = 0>
+        constexpr auto invoke(Fn&& f, Args&&... args) noexcept(
+            noexcept(std::mem_fn(f)(std::forward<Args>(args)...)))
+            -> decltype(std::mem_fn(f)(std::forward<Args>(args)...))
+        {
+            return std::mem_fn(f)(std::forward<Args>(args)...);
+        }
+
+        template <typename Fn,
+                  typename... Args,
+                  typename std::enable_if<!std::is_member_pointer<
+                      typename std::decay<Fn>::type>::value>::type* = nullptr>
+        constexpr auto invoke(Fn&& f, Args&&... args) noexcept(
+            noexcept(std::forward<Fn>(f)(std::forward<Args>(args)...)))
+            -> decltype(std::forward<Fn>(f)(std::forward<Args>(args)...))
+        {
+            return std::forward<Fn>(f)(std::forward<Args>(args)...);
+        }
+
+        // From Boost.mp11
+        template <typename T, T... I>
+        struct integer_sequence {
+        };
+
+        // iseq_if_c
+        template <bool C, typename T, typename E>
+        struct iseq_if_c_impl;
+
+        template <typename T, typename E>
+        struct iseq_if_c_impl<true, T, E> {
+            using type = T;
+        };
+
+        template <typename T, typename E>
+        struct iseq_if_c_impl<false, T, E> {
+            using type = E;
+        };
+
+        template <bool C, typename T, typename E>
+        using iseq_if_c = typename iseq_if_c_impl<C, T, E>::type;
+
+        // iseq_identity
+        template <typename T>
+        struct iseq_identity {
+            using type = T;
+        };
+
+        template <typename S1, typename S2>
+        struct append_integer_sequence;
+
+        template <typename T, T... I, T... J>
+        struct append_integer_sequence<integer_sequence<T, I...>,
+                                       integer_sequence<T, J...>> {
+            using type = integer_sequence<T, I..., (J + sizeof...(I))...>;
+        };
+
+        template <typename T, T N>
+        struct make_integer_sequence_impl;
+
+        template <typename T, T N>
+        struct make_integer_sequence_impl_ {
+        private:
+            static_assert(
+                N >= 0,
+                "make_integer_sequence<T, N>: N must not be negative");
+
+            static T const M = N / 2;
+            static T const R = N % 2;
+
+            using S1 = typename make_integer_sequence_impl<T, M>::type;
+            using S2 = typename append_integer_sequence<S1, S1>::type;
+            using S3 = typename make_integer_sequence_impl<T, R>::type;
+            using S4 = typename append_integer_sequence<S2, S3>::type;
+
+        public:
+            using type = S4;
+        };
+
+        template <typename T, T N>
+        struct make_integer_sequence_impl
+            : iseq_if_c<N == 0,
+                        iseq_identity<integer_sequence<T>>,
+                        iseq_if_c<N == 1,
+                                  iseq_identity<integer_sequence<T, 0>>,
+                                  make_integer_sequence_impl_<T, N>>> {
+        };
+
+        // make_integer_sequence
+        template <typename T, T N>
+        using make_integer_sequence =
+            typename detail::make_integer_sequence_impl<T, N>::type;
+
+        // index_sequence
+        template <std::size_t... I>
+        using index_sequence = integer_sequence<std::size_t, I...>;
+
+        // make_index_sequence
+        template <std::size_t N>
+        using make_index_sequence = make_integer_sequence<std::size_t, N>;
+
+        // index_sequence_for
+        template <typename... T>
+        using index_sequence_for =
+            make_integer_sequence<std::size_t, sizeof...(T)>;
+
+        // From cppreference
+        template <class F, class Tuple, std::size_t... I>
+        constexpr auto
+        apply_impl(F&& f, Tuple&& t, index_sequence<I...>) noexcept(
+            noexcept(detail::invoke(std::forward<F>(f),
+                                    std::get<I>(std::forward<Tuple>(t))...)))
+            -> decltype(detail::invoke(std::forward<F>(f),
+                                       std::get<I>(std::forward<Tuple>(t))...))
+        {
+            return detail::invoke(std::forward<F>(f),
+                                  std::get<I>(std::forward<Tuple>(t))...);
+        }  // namespace detail
+
+        template <class F, class Tuple>
+        constexpr auto apply(F&& f, Tuple&& t) noexcept(
+            noexcept(detail::apply_impl(
+                std::forward<F>(f),
+                std::forward<Tuple>(t),
+                make_index_sequence<std::tuple_size<
+                    typename std::remove_reference<Tuple>::type>::value>{})))
+            -> decltype(detail::apply_impl(
+                std::forward<F>(f),
+                std::forward<Tuple>(t),
+                make_index_sequence<std::tuple_size<
+                    typename std::remove_reference<Tuple>::type>::value>{}))
+        {
+            return detail::apply_impl(
+                std::forward<F>(f), std::forward<Tuple>(t),
+                make_index_sequence<std::tuple_size<
+                    typename std::remove_reference<Tuple>::type>::value>{});
+        }
+    }  // namespace detail
+
+    SCN_END_NAMESPACE
+}  // namespace scn
+
+#endif
-- 
cgit v1.2.3