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Telegram/ThirdParty/range-v3/include/range/v3/utility/copy.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_UTILITY_COPY_HPP
+#define RANGES_V3_UTILITY_COPY_HPP
+
+#include <concepts/concepts.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/utility/static_const.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-utility
+    /// @{
+    namespace aux
+    {
+        struct copy_fn : copy_tag
+        {
+            template(typename T)(
+                requires constructible_from<detail::decay_t<T>, T>)
+            constexpr auto operator()(T && t) const -> detail::decay_t<T>
+            {
+                return static_cast<T &&>(t);
+            }
+
+            /// \ingroup group-utility
+            /// \sa `copy_fn`
+            template<typename T>
+            friend constexpr auto operator|(T && t, copy_fn)
+                -> CPP_broken_friend_ret(detail::decay_t<T>)(
+                    requires constructible_from<detail::decay_t<T>, T>)
+            {
+                return static_cast<T &&>(t);
+            }
+        };
+
+        /// \ingroup group-utility
+        /// \sa `copy_fn`
+        RANGES_INLINE_VARIABLE(copy_fn, copy)
+    } // namespace aux
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif