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Telegram/ThirdParty/range-v3/include/range/v3/algorithm/merge.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
+//
+// Copyright (c) 2009 Alexander Stepanov and Paul McJones
+//
+// Permission to use, copy, modify, distribute and sell this software
+// and its documentation for any purpose is hereby granted without
+// fee, provided that the above copyright notice appear in all copies
+// and that both that copyright notice and this permission notice
+// appear in supporting documentation. The authors make no
+// representations about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+//
+// Algorithms from
+// Elements of Programming
+// by Alexander Stepanov and Paul McJones
+// Addison-Wesley Professional, 2009
+
+#ifndef RANGES_V3_ALGORITHM_MERGE_HPP
+#define RANGES_V3_ALGORITHM_MERGE_HPP
+
+#include <tuple>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/algorithm/copy.hpp>
+#include <range/v3/algorithm/result_types.hpp>
+#include <range/v3/functional/comparisons.hpp>
+#include <range/v3/functional/identity.hpp>
+#include <range/v3/functional/invoke.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/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-algorithms
+    /// @{
+    template<typename I0, typename I1, typename O>
+    using merge_result = detail::in1_in2_out_result<I0, I1, O>;
+
+    RANGES_FUNC_BEGIN(merge)
+
+        /// \brief function template \c merge
+        template(typename I0,
+                 typename S0,
+                 typename I1,
+                 typename S1,
+                 typename O,
+                 typename C = less,
+                 typename P0 = identity,
+                 typename P1 = identity)(
+            requires sentinel_for<S0, I0> AND sentinel_for<S1, I1> AND
+                mergeable<I0, I1, O, C, P0, P1>)
+        constexpr merge_result<I0, I1, O> RANGES_FUNC(merge)(I0 begin0,
+                                                             S0 end0,
+                                                             I1 begin1,
+                                                             S1 end1,
+                                                             O out,
+                                                             C pred = C{},
+                                                             P0 proj0 = P0{},
+                                                             P1 proj1 = P1{}) //
+        {
+            for(; begin0 != end0 && begin1 != end1; ++out)
+            {
+                if(invoke(pred, invoke(proj1, *begin1), invoke(proj0, *begin0)))
+                {
+                    *out = *begin1;
+                    ++begin1;
+                }
+                else
+                {
+                    *out = *begin0;
+                    ++begin0;
+                }
+            }
+            auto t0 = ranges::copy(begin0, end0, out);
+            auto t1 = ranges::copy(begin1, end1, t0.out);
+            return {t0.in, t1.in, t1.out};
+        }
+
+        /// \overload
+        template(typename Rng0,
+                 typename Rng1,
+                 typename O,
+                 typename C = less,
+                 typename P0 = identity,
+                 typename P1 = identity)(
+            requires range<Rng0> AND range<Rng1> AND
+                mergeable<iterator_t<Rng0>, iterator_t<Rng1>, O, C, P0, P1>)
+        constexpr merge_result<borrowed_iterator_t<Rng0>, borrowed_iterator_t<Rng1>, O>
+        RANGES_FUNC(merge)(Rng0 && rng0,
+                           Rng1 && rng1,
+                           O out,
+                           C pred = C{},
+                           P0 proj0 = P0{},
+                           P1 proj1 = P1{})
+        {
+            return (*this)(begin(rng0),
+                           end(rng0),
+                           begin(rng1),
+                           end(rng1),
+                           std::move(out),
+                           std::move(pred),
+                           std::move(proj0),
+                           std::move(proj1));
+        }
+
+    RANGES_FUNC_END(merge)
+
+    namespace cpp20
+    {
+        using ranges::merge;
+        using ranges::merge_result;
+    } // namespace cpp20
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif