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Telegram/ThirdParty/range-v3/include/range/v3/action/join.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_JOIN_HPP
+#define RANGES_V3_ACTION_JOIN_HPP
+
+#include <vector>
+
+#include <meta/meta.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/action/action.hpp>
+#include <range/v3/action/concepts.hpp>
+#include <range/v3/action/push_back.hpp>
+#include <range/v3/iterator/concepts.hpp>
+#include <range/v3/iterator/traits.hpp>
+#include <range/v3/utility/static_const.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-actions
+    /// @{
+    namespace actions
+    {
+        template<typename Rng>
+        using join_action_value_t_ =
+            meta::if_c<(bool)ranges::container<range_value_t<Rng>>, //
+                       range_value_t<Rng>,                          //
+                       std::vector<range_value_t<range_value_t<Rng>>>>;
+
+        struct join_fn
+        {
+            template(typename Rng)(
+                requires input_range<Rng> AND input_range<range_value_t<Rng>> AND
+                    semiregular<join_action_value_t_<Rng>>)
+            join_action_value_t_<Rng> operator()(Rng && rng) const
+            {
+                join_action_value_t_<Rng> ret;
+                auto last = ranges::end(rng);
+                for(auto it = begin(rng); it != last; ++it)
+                    push_back(ret, *it);
+                return ret;
+            }
+        };
+
+        /// \relates actions::join_fn
+        /// \sa action_closure
+        RANGES_INLINE_VARIABLE(action_closure<join_fn>, join)
+    } // namespace actions
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif