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Telegram/ThirdParty/range-v3/include/range/v3/view/const.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_VIEW_CONST_HPP
+#define RANGES_V3_VIEW_CONST_HPP
+
+#include <type_traits>
+#include <utility>
+
+#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/common_type.hpp>
+#include <range/v3/utility/move.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/view/adaptor.hpp>
+#include <range/v3/view/all.hpp>
+#include <range/v3/view/view.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-views
+    /// @{
+    template<typename Rng>
+    struct const_view : view_adaptor<const_view<Rng>, Rng>
+    {
+    private:
+        friend range_access;
+        template<bool Const>
+        struct adaptor : adaptor_base
+        {
+            using CRng = meta::const_if_c<Const, Rng>;
+            using value_ = range_value_t<CRng>;
+            using reference_ =
+                common_reference_t<value_ const &&, range_reference_t<CRng>>;
+            using rvalue_reference_ =
+                common_reference_t<value_ const &&, range_rvalue_reference_t<CRng>>;
+            adaptor() = default;
+            template(bool Other)(
+                requires Const && CPP_NOT(Other)) //
+                constexpr adaptor(adaptor<Other>)
+            {}
+            reference_ read(iterator_t<CRng> const & it) const
+            {
+                return *it;
+            }
+            rvalue_reference_ iter_move(iterator_t<CRng> const & it) const
+                noexcept(noexcept(rvalue_reference_(ranges::iter_move(it))))
+            {
+                return ranges::iter_move(it);
+            }
+        };
+        adaptor<simple_view<Rng>()> begin_adaptor()
+        {
+            return {};
+        }
+        CPP_member
+        auto begin_adaptor() const //
+            -> CPP_ret(adaptor<true>)(
+                requires range<Rng const>)
+        {
+            return {};
+        }
+        adaptor<simple_view<Rng>()> end_adaptor()
+        {
+            return {};
+        }
+        CPP_member
+        auto end_adaptor() const //
+            -> CPP_ret(adaptor<true>)(
+                requires range<Rng const>)
+        {
+            return {};
+        }
+
+    public:
+        const_view() = default;
+        explicit const_view(Rng rng)
+          : const_view::view_adaptor{std::move(rng)}
+        {}
+        CPP_auto_member
+        constexpr auto CPP_fun(size)()(
+            requires sized_range<Rng>)
+        {
+            return ranges::size(this->base());
+        }
+        CPP_auto_member
+        constexpr auto CPP_fun(size)()(const
+            requires sized_range<Rng const>)
+        {
+            return ranges::size(this->base());
+        }
+    };
+
+    template<typename Rng>
+    RANGES_INLINE_VAR constexpr bool enable_borrowed_range<const_view<Rng>> = //
+        enable_borrowed_range<Rng>;
+
+#if RANGES_CXX_DEDUCTION_GUIDES >= RANGES_CXX_DEDUCTION_GUIDES_17
+    template<typename Rng>
+    const_view(Rng &&) //
+        -> const_view<views::all_t<Rng>>;
+#endif
+
+    namespace views
+    {
+        struct const_fn
+        {
+            template(typename Rng)(
+                requires viewable_range<Rng> AND input_range<Rng>)
+            const_view<all_t<Rng>> operator()(Rng && rng) const
+            {
+                return const_view<all_t<Rng>>{all(static_cast<Rng &&>(rng))};
+            }
+        };
+
+        /// \relates const_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(view_closure<const_fn>, const_)
+    } // namespace views
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+#include <range/v3/detail/satisfy_boost_range.hpp>
+RANGES_SATISFY_BOOST_RANGE(::ranges::const_view)
+
+#endif