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

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+/// \file
+// Range v3 library
+//
+//  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_ALL_HPP
+#define RANGES_V3_VIEW_ALL_HPP
+
+#include <type_traits>
+
+#include <meta/meta.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/range/access.hpp>
+#include <range/v3/range/concepts.hpp>
+#include <range/v3/range/primitives.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/view/ref.hpp>
+#include <range/v3/view/subrange.hpp>
+#include <range/v3/view/view.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-views
+    /// @{
+    namespace views
+    {
+        struct all_fn
+        {
+        private:
+            /// If it's a view already, pass it though.
+            template<typename T>
+            static constexpr auto from_range_(T && t, std::true_type, detail::ignore_t,
+                                              detail::ignore_t)
+            {
+                return static_cast<T &&>(t);
+            }
+
+            /// If it is container-like, turn it into a view, being careful
+            /// to preserve the Sized-ness of the range.
+            template<typename T>
+            static constexpr auto from_range_(T && t, std::false_type, std::true_type,
+                                              detail::ignore_t)
+            {
+                return ranges::views::ref(t);
+            }
+
+            /// Not a view and not an lvalue? If it's a borrowed_range, then
+            /// return a subrange holding the range's begin/end.
+            template<typename T>
+            static constexpr auto from_range_(T && t, std::false_type, std::false_type,
+                                              std::true_type)
+            {
+                return make_subrange(static_cast<T &&>(t));
+            }
+
+        public:
+            template(typename T)(
+                requires range<T &> AND viewable_range<T>)
+            constexpr auto operator()(T && t) const
+            {
+                return all_fn::from_range_(static_cast<T &&>(t),
+                                           meta::bool_<view_<uncvref_t<T>>>{},
+                                           std::is_lvalue_reference<T>{},
+                                           meta::bool_<borrowed_range<T>>{});
+            }
+
+            template<typename T>
+            RANGES_DEPRECATED("Passing a reference_wrapper to views::all is deprecated.")
+            constexpr ref_view<T> operator()(std::reference_wrapper<T> r) const
+            {
+                return ranges::views::ref(r.get());
+            }
+        };
+
+        /// \relates all_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(view_closure<all_fn>, all)
+
+        template<typename Rng>
+        using all_t = decltype(all(std::declval<Rng>()));
+    } // namespace views
+
+    template<typename Rng>
+    struct identity_adaptor : Rng
+    {
+        CPP_assert(view_<Rng>);
+
+        identity_adaptor() = default;
+        constexpr explicit identity_adaptor(Rng const & rng)
+          : Rng(rng)
+        {}
+        constexpr explicit identity_adaptor(Rng && rng)
+          : Rng(detail::move(rng))
+        {}
+    };
+
+    namespace cpp20
+    {
+        namespace views
+        {
+            using ranges::views::all;
+            using ranges::views::all_t;
+        }
+        template(typename Rng)(
+            requires viewable_range<Rng>)
+        using all_view RANGES_DEPRECATED(
+            "Please use ranges::cpp20::views::all_t instead.") =
+                ranges::views::all_t<Rng>;
+    } // namespace cpp20
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif