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

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+/// \file
+// Range v3 library
+//
+//  Copyright Filip Matzner 2015
+//
+//  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_SHUFFLE_HPP
+#define RANGES_V3_ACTION_SHUFFLE_HPP
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/action/action.hpp>
+#include <range/v3/algorithm/shuffle.hpp>
+#include <range/v3/functional/bind.hpp>
+#include <range/v3/functional/bind_back.hpp>
+#include <range/v3/functional/invoke.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
+    {
+        struct shuffle_fn
+        {
+            template(typename Gen)(
+                requires uniform_random_bit_generator<Gen>)
+            constexpr auto operator()(Gen & gen) const
+            {
+                return make_action_closure(
+                    bind_back(shuffle_fn{}, detail::reference_wrapper_<Gen>(gen)));
+            }
+
+            template(typename Gen)(
+                requires uniform_random_bit_generator<Gen>)
+            constexpr auto operator()(Gen && gen) const
+            {
+                return make_action_closure(
+                    bind_back(shuffle_fn{}, static_cast<Gen &&>(gen)));
+            }
+
+            template(typename Rng, typename Gen)(
+                requires random_access_range<Rng> AND permutable<iterator_t<Rng>> AND
+                    uniform_random_bit_generator<std::remove_reference_t<Gen>> AND
+                    convertible_to<invoke_result_t<Gen &>, range_difference_t<Rng>>)
+            Rng operator()(Rng && rng, Gen && gen) const
+            {
+                ranges::shuffle(rng, static_cast<Gen &&>(gen));
+                return static_cast<Rng &&>(rng);
+            }
+
+            /// \cond
+            template<typename Rng, typename T>
+            invoke_result_t<shuffle_fn, Rng, T &> //
+            operator()(Rng && rng, detail::reference_wrapper_<T> r) const
+            {
+                return (*this)(static_cast<Rng &&>(rng), r.get());
+            }
+            /// \endcond
+        };
+
+        /// \relates actions::shuffle_fn
+        /// \sa `action_closure`
+        RANGES_INLINE_VARIABLE(shuffle_fn, shuffle)
+    } // namespace actions
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif