P1638R1 basic_istream_view::iterator should not be copyable

Author: jensmaurer

source/ranges.tex

@@ -5560,6 +5560,12 @@
     iterator() = default;
     constexpr explicit iterator(basic_istream_view& parent) noexcept;
 
+    iterator(const iterator&) = delete;
+    iterator(iterator&&) = default;
+
+    iterator& operator=(const iterator&) = delete;
+    iterator& operator=(iterator&&) = default;
+
     iterator& operator++();
     void operator++(int);