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Telegram/ThirdParty/range-v3/include/range/v3/algorithm/partition.hpp

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+/// \file
+// Range v3 library
+//
+//  Copyright Eric Niebler 2014-present
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+//
+//===-------------------------- algorithm ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#ifndef RANGES_V3_ALGORITHM_PARTITION_HPP
+#define RANGES_V3_ALGORITHM_PARTITION_HPP
+
+#include <meta/meta.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/functional/identity.hpp>
+#include <range/v3/functional/invoke.hpp>
+#include <range/v3/iterator/concepts.hpp>
+#include <range/v3/iterator/operations.hpp>
+#include <range/v3/iterator/traits.hpp>
+#include <range/v3/range/access.hpp>
+#include <range/v3/range/concepts.hpp>
+#include <range/v3/range/dangling.hpp>
+#include <range/v3/range/traits.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/utility/swap.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-algorithms
+    /// @{
+
+    /// \cond
+    namespace detail
+    {
+        template<typename I, typename S, typename C, typename P>
+        constexpr I partition_impl(I first, S last, C pred, P proj, std::forward_iterator_tag)
+        {
+            while(true)
+            {
+                if(first == last)
+                    return first;
+                if(!invoke(pred, invoke(proj, *first)))
+                    break;
+                ++first;
+            }
+            for(I p = first; ++p != last;)
+            {
+                if(invoke(pred, invoke(proj, *p)))
+                {
+                    ranges::iter_swap(first, p);
+                    ++first;
+                }
+            }
+            return first;
+        }
+
+        template<typename I, typename S, typename C, typename P>
+        constexpr I partition_impl(I first, S end_, C pred, P proj, std::bidirectional_iterator_tag)
+        {
+            I last = ranges::next(first, end_);
+            while(true)
+            {
+                while(true)
+                {
+                    if(first == last)
+                        return first;
+                    if(!invoke(pred, invoke(proj, *first)))
+                        break;
+                    ++first;
+                }
+                do
+                {
+                    if(first == --last)
+                        return first;
+                } while(!invoke(pred, invoke(proj, *last)));
+                ranges::iter_swap(first, last);
+                ++first;
+            }
+        }
+    } // namespace detail
+    /// \endcond
+
+    RANGES_FUNC_BEGIN(partition)
+
+        /// \brief function template \c partition
+        template(typename I, typename S, typename C, typename P = identity)(
+            requires permutable<I> AND sentinel_for<S, I> AND
+            indirect_unary_predicate<C, projected<I, P>>)
+        constexpr I RANGES_FUNC(partition)(I first, S last, C pred, P proj = P{})
+        {
+            return detail::partition_impl(std::move(first),
+                                          std::move(last),
+                                          std::move(pred),
+                                          std::move(proj),
+                                          iterator_tag_of<I>());
+        }
+
+        /// \overload
+        template(typename Rng, typename C, typename P = identity)(
+            requires forward_range<Rng> AND permutable<iterator_t<Rng>> AND
+            indirect_unary_predicate<C, projected<iterator_t<Rng>, P>>)
+        constexpr borrowed_iterator_t<Rng> RANGES_FUNC(partition)(Rng && rng, C pred, P proj = P{})
+        {
+            return detail::partition_impl(begin(rng),
+                                          end(rng),
+                                          std::move(pred),
+                                          std::move(proj),
+                                          iterator_tag_of<iterator_t<Rng>>());
+        }
+
+    RANGES_FUNC_END(partition)
+
+    namespace cpp20
+    {
+        using ranges::partition;
+    }
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif