[oneDPL][ranges] + zip_view implementation for C++20

include/oneapi/dpl/pstl/ranges_defs.h

@@ -23,6 +23,9 @@
 #include <ranges>
 #endif
 
+//oneapi::dpl::ranges::zip_view support for C++20
+#include "zip_view_impl.h"
+
 #include "utils_ranges.h"
 #if _ONEDPL_BACKEND_SYCL
 #    include "hetero/dpcpp/utils_ranges_sycl.h"

include/oneapi/dpl/pstl/tuple_impl.h

@@ -385,8 +385,8 @@ inline constexpr bool __enable_comparison_op_v =
 template <typename T1, typename... T>
 struct tuple<T1, T...>
 {
-    oneapi::dpl::__internal::__copy_assignable_holder<T1> holder;
-    tuple<T...> next;
+    oneapi::dpl::__internal::__copy_assignable_holder<T1> holder{};
+    tuple<T...> next{};
 
     using tuple_type = ::std::tuple<T1, T...>;
 
@@ -501,6 +501,15 @@ struct tuple<T1, T...>
         return *this;
     }
 
+    template <typename U1, typename... U>
+    tuple&
+    operator=(const tuple<U1, U...>& other) const
+    {
+        holder.value = other.holder.value;
+        next = other.next;
+        return *this;
+    }
+
     // if T1 is deduced with reference, compiler generates deleted operator= and,
     // since "template operator=" is not considered as operator= overload
     // the deleted operator= has a preference during lookup