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2706. Error reporting for recursive_directory_iterator::pop() is under-specified

Section: 31.12.12 [fs.class.rec.dir.itr] Status: C++17 Submitter: Eric Fiselier Opened: 2016-05-09 Last modified: 2017-07-30

Priority: 0

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Discussion:

Unlike increment, pop() does not specify how it reports errors nor does it provide a std::error_code overload. However implementing pop() all but requires performing an increment, so it should handle errors in the same way.

Proposed resolution:

This wording is relative to N4582.

1. Change 31.12.12 [fs.class.rec.dir.itr], class recursive_directory_iterator synopsis, as indicated:

   namespace std::filesystem {
     class recursive_directory_iterator {
     public:
       […]
       void pop();
       void pop(error_code& ec);
       void disable_recursion_pending();
       […]
     };
   }
   

2. Change 31.12.12.2 [fs.rec.dir.itr.members] as indicated:

   void pop();
   void pop(error_code& ec);
   

   -30- Requires: *this != recursive_directory_iterator().

   -31- Effects: If depth() == 0, set *this to recursive_directory_iterator(). Otherwise, cease iteration of the directory currently being iterated over, and continue iteration over the parent directory.

   -?- Throws: As specified in Error reporting (31.5.6 [error.reporting]).