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### 2834. Resolution LWG 2223 is missing wording about end iterators

Section: 21.3.3.5 [string.capacity], 22.3.8.3 [deque.capacity], 22.3.11.3 [vector.capacity] Status: C++17 Submitter: Thomas Koeppe Opened: 2016-11-29 Last modified: 2020-09-06

Priority: 0

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Discussion:

The resolution of LWG 2223 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 as well as the past-the-end iterator.

[2017-01-27 Telecon]

Priority 0

Proposed resolution:

This wording is relative to N4618.

1. Edit 21.3.3.5 [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 as well as the past-the-end iterator. If no reallocation happens, they remain valid.

2. Edit 22.3.8.3 [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 as well as the past-the-end iterator.

3. Edit 22.3.11.3 [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 as well as the past-the-end iterator. If no reallocation happens, they remain valid.