std::unordered_multiset<Key,Hash,KeyEqual,Allocator>::end(size_type), std::unordered_multiset<Key,Hash,KeyEqual,Allocator>::cend(size_type) - cppreference.com

From cppreference.com

local_iteratorend(size_typen);(since C++11)const_local_iteratorend(size_typen)const;(since C++11)const_local_iteratorcend(size_typen)const;(since C++11)Returns an iterator to the element following the last element of the bucket with index n. This element acts as a placeholder, attempting to access it results in undefined behavior.

Parameters

n - the index of the bucket to access Return value

Iterator to the element following the last element.

Complexity

Constant.