[ 2022-07-06; Reflector poll ]

Set priority to 3 after reflector poll.

Previous resolution [SUPERSEDED]:

This wording is relative to N4910.

1. Modify [range.common.view] as indicated:

   namespace std::ranges {
     template<view V>
       requires (!common_range<V> && copyable<iterator_t<V>>)
     class common_view : public view_interface<common_view<V>> {
     private:
       V base_ = V();  // exposition only
     public:
       […]
       constexpr auto begin() {
         if constexpr (random_access_range<V> && sized_range<V>)
           return ranges::begin(base_);
         else
           return common_iterator<iterator_t<V>, sentinel_t<V>>(ranges::begin(base_));
       }
   
       constexpr auto begin() const requires range<const V> {
         if constexpr (random_access_range<const V> && sized_range<const V>)
           return ranges::begin(base_);
         else
           return common_iterator<iterator_t<const V>, sentinel_t<const V>>(ranges::begin(base_));
       }
       
       constexpr auto end() {
         if constexpr (random_access_range<V> && sized_range<V>)
           return ranges::begin(base_) + range_difference_t<V>(size())ranges::size(base_);
         else
           return common_iterator<iterator_t<V>, sentinel_t<V>>(ranges::end(base_));
       }
   
       constexpr auto end() const requires range<const V> {
         if constexpr (random_access_range<const V> && sized_range<const V>)
           return ranges::begin(base_) + range_difference_t<const V>(size())ranges::size(base_);
         else
           return common_iterator<iterator_t<const V>, sentinel_t<const V>>(ranges::end(base_));
       }
   
       constexpr auto size() requires sized_range<V> {
         return ranges::size(base_);
       }
       constexpr auto size() const requires sized_range<const V> {
         return ranges::size(base_);
       }
     };
     […]
   }