Return a theoretical upper bound on the number of buckets.
Declared in <bslstl_unorderedset.h>
unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::size_type
max_bucket_count() const noexcept;
Return a theoretical upper bound on the largest number of buckets that this container could possibly manage. Note that there is no guarantee that the set can successfully grow to the returned size, or even close to that size without running out of resources.
theoretical maximum number of buckets