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Telegram/ThirdParty/range-v3/include/range/v3/view/unbounded.hpp

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+//
+//  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
+//
+
+#ifndef RANGES_V3_VIEW_UNBOUNDED_HPP
+#define RANGES_V3_VIEW_UNBOUNDED_HPP
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/iterator/unreachable_sentinel.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/view/interface.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-views
+    /// @{
+    template<typename I>
+    struct unbounded_view : view_interface<unbounded_view<I>, infinite>
+    {
+    private:
+        I it_;
+
+    public:
+        unbounded_view() = default;
+        constexpr explicit unbounded_view(I it)
+          : it_(detail::move(it))
+        {}
+        constexpr I begin() const
+        {
+            return it_;
+        }
+        constexpr unreachable_sentinel_t end() const
+        {
+            return {};
+        }
+    };
+
+    template<typename I>
+    RANGES_INLINE_VAR constexpr bool enable_borrowed_range<unbounded_view<I>> = true;
+
+    namespace views
+    {
+        struct unbounded_fn
+        {
+            template(typename I)(
+                requires input_iterator<I>)
+            constexpr unbounded_view<I> operator()(I it) const
+            {
+                return unbounded_view<I>{detail::move(it)};
+            }
+        };
+
+        /// \relates unbounded_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(unbounded_fn, unbounded)
+    } // namespace views
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+#include <range/v3/detail/satisfy_boost_range.hpp>
+RANGES_SATISFY_BOOST_RANGE(::ranges::unbounded_view)
+
+#endif