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2775. reverse_iterator is does not compile for fancy pointers

Section: 25.5.1.6 [reverse.iter.elem] Status: Dup Submitter: Billy Robert O'Neal III Opened: 2016-09-23 Last modified: 2021-06-06

Priority: Not Prioritized

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Duplicate of: 1052

Discussion:

std::reverse_iterator<Iterator>::operator->() is specified to call addressof(operator*()), but it returns iterator_traits<Iterator>::pointer, which may be a fancy pointer type from which no conversion from T* is possible. It should instead delegate to the underlying iterator's operator->().

[Issues processing Telecon 2016-10-7]

Set status to Duplicate

Proposed resolution:

This wording is relative to N4606.

1. Modify [reverse.iter.opref] as indicated:

   constexpr pointer operator->() const;
   

   -1- Returns: addressof(operator*()).Effects: If Iterator is a pointer type, as if by:

   Iterator tmp = current;
   return --tmp;
   

   Otherwise, as if by:

   Iterator tmp = current;
   --tmp;
   return tmp.operator->();