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Telegram/ThirdParty/range-v3/include/range/v3/view/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_VIEW_UNIQUE_HPP
+#define RANGES_V3_VIEW_UNIQUE_HPP
+
+#include <utility>
+
+#include <meta/meta.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/functional/bind_back.hpp>
+#include <range/v3/functional/not_fn.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/view/adjacent_filter.hpp>
+#include <range/v3/view/all.hpp>
+#include <range/v3/view/view.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-views
+    /// @{
+    namespace views
+    {
+        struct unique_base_fn
+        {
+            template(typename Rng, typename C = equal_to)(
+                requires viewable_range<Rng> AND forward_range<Rng> AND
+                    indirect_relation<C, iterator_t<Rng>>)
+            constexpr adjacent_filter_view<all_t<Rng>, logical_negate<C>> //
+            operator()(Rng && rng, C pred = {}) const
+            {
+                return {all(static_cast<Rng &&>(rng)), not_fn(pred)};
+            }
+        };
+
+        struct unique_fn : unique_base_fn
+        {
+            using unique_base_fn::operator();
+
+            template(typename C)(
+                requires (!range<C>))
+            constexpr auto operator()(C && pred) const
+            {
+                return make_view_closure(
+                    bind_back(unique_base_fn{}, static_cast<C &&>(pred)));
+            }
+        };
+
+        /// \relates unique_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(view_closure<unique_fn>, unique)
+    } // namespace views
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif