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Returns the bucket number where the element with key k is located.
A bucket is a slot in the container's internal hash table to which elements are assigned based on the hash value of their key. Buckets are numbered from 0 to (bucket_count-1).
Individual elements in a bucket can be accessed by means of the range iterators returned by unordered_map::begin and unordered_map::end.
Member type size_type is an unsigned integral type.
Possible output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<unordered_map>
-
unordered_mapC++11
-
unordered_multimapC++11
unordered_map
-
unordered_map::~unordered_mapC++11
-
unordered_map::unordered_mapC++11
member functions
-
unordered_map::atC++11
-
unordered_map::beginC++11
-
unordered_map::bucketC++11
-
unordered_map::bucket_countC++11
-
unordered_map::bucket_sizeC++11
-
unordered_map::cbeginC++11
-
unordered_map::cendC++11
-
unordered_map::clearC++11
-
unordered_map::countC++11
-
unordered_map::emplaceC++11
-
unordered_map::emplace_hintC++11
-
unordered_map::emptyC++11
-
unordered_map::endC++11
-
unordered_map::equal_rangeC++11
-
unordered_map::eraseC++11
-
unordered_map::findC++11
-
unordered_map::get_allocatorC++11
-
unordered_map::hash_functionC++11
-
unordered_map::insertC++11
-
unordered_map::key_eqC++11
-
unordered_map::load_factorC++11
-
unordered_map::max_bucket_countC++11
-
unordered_map::max_load_factorC++11
-
unordered_map::max_sizeC++11
-
unordered_map::operator[]C++11
-
unordered_map::operator=C++11
-
unordered_map::rehashC++11
-
unordered_map::reserveC++11
-
unordered_map::sizeC++11
-
unordered_map::swapC++11
-
non-member overloads
-
operators (unordered_map)C++11
-
swap (unordered_map)C++11
-
public member function
<unordered_map>
std::unordered_map::bucket
size_type bucket ( const key_type& k ) const;
Locate element's bucket
A bucket is a slot in the container's internal hash table to which elements are assigned based on the hash value of their key. Buckets are numbered from 0 to (bucket_count-1).
Individual elements in a bucket can be accessed by means of the range iterators returned by unordered_map::begin and unordered_map::end.
Parameters
- k
- Key whose bucket is to be located.
Member type key_type is the type of the keys for the elements in the container, defined in unordered_map as an alias of its first template parameter (Key).
Return value
The order number of the bucket corresponding to k.Member type size_type is an unsigned integral type.
Example
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Possible output:
Element [us:United States] is in bucket #1 Element [de:Germany] is in bucket #2 Element [fr:France] is in bucket #2 Element [uk:United Kingdom] is in bucket #4 |
Complexity
Constant.Iterator validity
No changes.See also
- unordered_map::find
- Get iterator to element (public member function)
- unordered_map::bucket_size
- Return bucket size (public member type)
- unordered_map::bucket_count
- Return number of buckets (public member function)
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Spotted an error? contact us