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Telegram/ThirdParty/range-v3/include/range/v3/view/zip.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_ZIP_HPP
+#define RANGES_V3_VIEW_ZIP_HPP
+
+#include <tuple>
+#include <utility>
+
+#include <meta/meta.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/iterator/concepts.hpp>
+#include <range/v3/iterator/traits.hpp>
+#include <range/v3/utility/common_tuple.hpp>
+#include <range/v3/view/all.hpp>
+#include <range/v3/view/empty.hpp>
+#include <range/v3/view/zip_with.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \cond
+    namespace detail
+    {
+        struct indirect_zip_fn_
+        {
+            // tuple value
+            template(typename... Its)(
+                requires (sizeof...(Its) != 2) AND and_v<indirectly_readable<Its>...>)
+            std::tuple<iter_value_t<Its>...> operator()(copy_tag, Its...) const
+            {
+                RANGES_EXPECT(false);
+            }
+
+            // tuple reference
+            template(typename... Its)(
+                requires (sizeof...(Its) != 2) AND and_v<indirectly_readable<Its>...>)
+            common_tuple<iter_reference_t<Its>...>
+            operator()(Its const &... its) const //
+                noexcept(meta::and_c<noexcept(iter_reference_t<Its>(*its))...>::value)
+            {
+                return common_tuple<iter_reference_t<Its>...>{*its...};
+            }
+
+            // tuple rvalue reference
+            template(typename... Its)(
+                requires (sizeof...(Its) != 2) AND and_v<indirectly_readable<Its>...>)
+            common_tuple<iter_rvalue_reference_t<Its>...> //
+            operator()(move_tag, Its const &... its) const //
+                noexcept(meta::and_c<noexcept(
+                             iter_rvalue_reference_t<Its>(iter_move(its)))...>::value)
+            {
+                return common_tuple<iter_rvalue_reference_t<Its>...>{iter_move(its)...};
+            }
+
+            // pair value
+            template(typename It1, typename It2)(
+                requires indirectly_readable<It1> AND indirectly_readable<It2>)
+            std::pair<iter_value_t<It1>, iter_value_t<It2>> //
+            operator()(copy_tag, It1, It2) const
+            {
+                RANGES_EXPECT(false);
+            }
+
+            // pair reference
+            template(typename It1, typename It2)(
+                requires indirectly_readable<It1> AND indirectly_readable<It2>)
+            common_pair<iter_reference_t<It1>, iter_reference_t<It2>>
+            operator()(It1 const & it1, It2 const & it2) const //
+                noexcept( //
+                    noexcept(iter_reference_t<It1>(*it1)) && //
+                    noexcept(iter_reference_t<It2>(*it2)))
+            {
+                return {*it1, *it2};
+            }
+
+            // pair rvalue reference
+            template(typename It1, typename It2)(
+                requires indirectly_readable<It1> AND indirectly_readable<It2>)
+            common_pair<iter_rvalue_reference_t<It1>, iter_rvalue_reference_t<It2>>
+            operator()(move_tag, It1 const & it1, It2 const & it2) const
+                noexcept(noexcept(iter_rvalue_reference_t<It1>(iter_move(it1))) &&
+                         noexcept(iter_rvalue_reference_t<It2>(iter_move(it2))))
+            {
+                return {iter_move(it1), iter_move(it2)};
+            }
+        };
+    } // namespace detail
+    /// \endcond
+
+    /// \addtogroup group-views
+    /// @{
+    template<typename... Rngs>
+    struct zip_view : iter_zip_with_view<detail::indirect_zip_fn_, Rngs...>
+    {
+        CPP_assert(sizeof...(Rngs) != 0);
+
+        zip_view() = default;
+        explicit zip_view(Rngs... rngs)
+          : iter_zip_with_view<detail::indirect_zip_fn_, Rngs...>{
+                detail::indirect_zip_fn_{},
+                std::move(rngs)...}
+        {}
+    };
+
+    template<typename... Rng>
+    RANGES_INLINE_VAR constexpr bool enable_borrowed_range<zip_view<Rng...>> =
+        and_v<enable_borrowed_range<Rng>...>;
+
+#if RANGES_CXX_DEDUCTION_GUIDES >= RANGES_CXX_DEDUCTION_GUIDES_17
+    template<typename... Rng>
+    zip_view(Rng &&...) //
+        -> zip_view<views::all_t<Rng>...>;
+#endif
+
+    namespace views
+    {
+        struct zip_fn
+        {
+            constexpr empty_view<std::tuple<>> operator()() const noexcept
+            {
+                return {};
+            }
+            template(typename... Rngs)(
+                requires and_v<viewable_range<Rngs>...> AND
+                and_v<input_range<Rngs>...> AND
+                (sizeof...(Rngs) != 0)) //
+            zip_view<all_t<Rngs>...> operator()(Rngs &&... rngs) const
+            {
+                return zip_view<all_t<Rngs>...>{all(static_cast<Rngs &&>(rngs))...};
+            }
+#if defined(_MSC_VER)
+            template(typename Rng0)(
+                requires input_range<Rng0> AND viewable_range<Rng0>)
+            constexpr zip_view<all_t<Rng0>> operator()(Rng0 && rng0) const
+            {
+                return zip_view<all_t<Rng0>>{all(static_cast<Rng0 &&>(rng0))};
+            }
+            template(typename Rng0, typename Rng1)(
+                requires input_range<Rng0> AND viewable_range<Rng0> AND
+                    input_range<Rng1> AND viewable_range<Rng1>)
+            constexpr zip_view<all_t<Rng0>, all_t<Rng1>> //
+            operator()(Rng0 && rng0, Rng1 && rng1) const
+            {
+                return zip_view<all_t<Rng0>, all_t<Rng1>>{ //
+                    all(static_cast<Rng0 &&>(rng0)),       //
+                    all(static_cast<Rng1 &&>(rng1))};
+            }
+            template(typename Rng0, typename Rng1, typename Rng2)(
+                requires input_range<Rng0> AND viewable_range<Rng0> AND
+                    input_range<Rng1> AND viewable_range<Rng1> AND
+                    input_range<Rng2> AND viewable_range<Rng2>)
+            constexpr zip_view<all_t<Rng0>, all_t<Rng1>, all_t<Rng2>> //
+            operator()(Rng0 && rng0, Rng1 && rng1, Rng2 && rng2) const
+            {
+                return zip_view<all_t<Rng0>, all_t<Rng1>, all_t<Rng2>>{ //
+                    all(static_cast<Rng0 &&>(rng0)),                    //
+                    all(static_cast<Rng1 &&>(rng1)),                    //
+                    all(static_cast<Rng2 &&>(rng2))};
+            }
+#endif
+        };
+
+        /// \relates zip_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(zip_fn, zip)
+    } // namespace views
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/satisfy_boost_range.hpp>
+RANGES_SATISFY_BOOST_RANGE(::ranges::zip_view)
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif