std::unordered_set<Key,Hash,KeyEqual,Allocator>::bucket_size - cppreference.com
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std::unordered_set<Key,Hash,KeyEqual,Allocator>::bucket_size

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size_type bucket_size( size_type n ) const;
(since C++11)

Returns the number of elements in the bucket with index n.

Parameters

n - the index of the bucket to examine

Return value

The number of elements in the bucket n.

Complexity

Linear in the size of the bucket n.

See also