# std::unordered_set<Key,Hash,KeyEqual,Allocator>::bucket

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< cpp‎ | container‎ | unordered set

size_type bucket( const Key& key ) const; |  | (since C++11)

Returns the index of the bucket for key `key`. Elements (if any) with keys equivalent to `key` are always found in this bucket. The returned value is valid only for instances of the container for which bucket_count() returns the same value.

The behavior is undefined if bucket_count() is zero.

### Parameters

key | - | the value of the key to examine

### Return value

Bucket index for the key `key`.

### Complexity

Constant.

### See also

bucket_size (C++11) | returns the number of elements in specific bucket (public member function)

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