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Telegram/ThirdParty/range-v3/include/range/v3/action/unique.hpp

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+/// \file
+// Range v3 library
+//
+//  Copyright Eric Niebler 2013-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
+//
+
+#ifndef RANGES_V3_ACTION_UNIQUE_HPP
+#define RANGES_V3_ACTION_UNIQUE_HPP
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/action/action.hpp>
+#include <range/v3/action/erase.hpp>
+#include <range/v3/algorithm/unique.hpp>
+#include <range/v3/functional/bind_back.hpp>
+#include <range/v3/functional/comparisons.hpp>
+#include <range/v3/functional/identity.hpp>
+#include <range/v3/iterator/concepts.hpp>
+#include <range/v3/range/traits.hpp>
+#include <range/v3/utility/static_const.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-actions
+    /// @{
+    namespace actions
+    {
+        struct unique_fn
+        {
+            template(typename C, typename P = identity)(
+                requires (!range<C>))
+            constexpr auto operator()(C pred, P proj = P{}) const
+            {
+                return make_action_closure(
+                    bind_back(unique_fn{}, std::move(pred), std::move(proj)));
+            }
+
+            template(typename Rng, typename C = equal_to, typename P = identity)(
+                requires forward_range<Rng> AND
+                    erasable_range<Rng &, iterator_t<Rng>, sentinel_t<Rng>> AND
+                    sortable<iterator_t<Rng>, C, P>)
+            Rng operator()(Rng && rng, C pred = C{}, P proj = P{}) const
+            {
+                auto it = ranges::unique(rng, std::move(pred), std::move(proj));
+                ranges::erase(rng, it, end(rng));
+                return static_cast<Rng &&>(rng);
+            }
+        };
+
+        /// \relates detail::unique_fn
+        /// \sa action_closure
+        RANGES_INLINE_VARIABLE(action_closure<unique_fn>, unique)
+    } // namespace actions
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif