[oneDPL][ranges][zip_view] + enumerate_view

Author: MikeDvorskiy

include/oneapi/dpl/pstl/zip_view_impl.h

@@ -377,6 +377,20 @@ struct zip_fn {
 
 inline constexpr zip_fn zip{};
 
+template <typename _R>
+using enumerate_view = oneapi::dpl::ranges::zip_view<std::ranges::iota_view<std::ranges::range_size_t<_R>,
+                                                     std::ranges::range_size_t<_R>>, _R>;
+
+struct enumerate_fn {
+    template <std::ranges::viewable_range _R>
+    constexpr auto operator()(_R&& __r) const {
+        return oneapi::dpl::ranges::zip_view(std::views::iota((std::ranges::range_size_t<_R>)0,
+                                             std::ranges::size(__r)), std::forward<_R>(__r));
+    }
+};
+
+inline constexpr enumerate_fn enumerate{};
+
 } // namespace ranges
 } // namespace dpl
 } // namespace oneapi