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2834. Resolution LWG 2223 is missing wording about end iterators

Section: 27.4.3.5 [string.capacity], 23.3.5.3 [deque.capacity], 23.3.13.3 [vector.capacity] Status: C++17 Submitter: Thomas Koeppe Opened: 2016年11月29日 Last modified: 2020年09月06日

Priority: 0

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Discussion:

The resolution of LWG 2223 ⁽ⁱ⁾ added the wording "Reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence." to a number of shrink_to_fit operations.

This seems to be missing any mention of end iterators. Surely end iterators are invalidated, too?

Suggested resolution:

For string, deque, and vector each, append as follows:

Reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence (追記) as well as the past-the-end iterator (追記ここまで).

[2017年01月27日 Telecon]

Priority 0

Proposed resolution:

This wording is relative to N4618.

1. Edit 27.4.3.5 [string.capacity] as indicated:

   void shrink_to_fit();
   

   […]

   -15- Remarks: Reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence (追記) as well as the past-the-end iterator (追記ここまで). If no reallocation happens, they remain valid.

2. Edit 23.3.5.3 [deque.capacity] as indicated:

   void shrink_to_fit();
   

   […]

   -8- Remarks: shrink_to_fit invalidates all the references, pointers, and iterators referring to the elements in the sequence (追記) as well as the past-the-end iterator (追記ここまで).

3. Edit 23.3.13.3 [vector.capacity] as indicated:

   void shrink_to_fit();
   

   […]

   -10- Remarks: Reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence (追記) as well as the past-the-end iterator (追記ここまで). If no reallocation happens, they remain valid.