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4292. Unordered container local iterators should be constexpr iterators

Section: 23.5.3.1 [unord.map.overview], 23.5.4.1 [unord.multimap.overview], 23.5.6.1 [unord.set.overview], 23.5.7.1 [unord.multiset.overview] Status: New Submitter: Jonathan Wakely Opened: 2025-07-10 Last modified: 2025-07-10

Priority: Not Prioritized

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Discussion:

The intent of P3372R3 was for all container iterators to be constexpr iterators, but during application of the paper to the working draft it was observed that unordered containers don't say it for their local iterators.

Proposed resolution:

This wording is relative to N5008.

1. Modify 23.5.3.1 [unord.map.overview] as indicated:

   -4- The types iterator, and const_iterator, local_iterator, and local_const_iterator meet the constexpr iterator requirements (24.3.1 [iterator.requirements.general]).

2. Modify 23.5.4.1 [unord.multimap.overview] as indicated:

   -4- The types iterator, and const_iterator, local_iterator, and local_const_iterator meet the constexpr iterator requirements (24.3.1 [iterator.requirements.general]).

3. Modify 23.5.6.1 [unord.set.overview] as indicated:

   -4- The types iterator, and const_iterator, local_iterator, and local_const_iterator meet the constexpr iterator requirements (24.3.1 [iterator.requirements.general]).

4. Modify 23.5.7.1 [unord.multiset.overview] as indicated:

   -4- The types iterator, and const_iterator, local_iterator, and local_const_iterator meet the constexpr iterator requirements (24.3.1 [iterator.requirements.general]).