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Searches the container for an element with k as key and returns an iterator to it if found, otherwise it returns an iterator to unordered_multimap::end (the element past the end of the container).
To obtain a range with all the elements whose key is k you can use member function equal_range.
To just check whether a particular key exists, you can use count.
Member types iterator and const_iterator are forward iterator types.
Output:
Worst case: linear in container size.
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_multimap
-
unordered_multimap::~unordered_multimapC++11
-
unordered_multimap::unordered_multimapC++11
member functions
-
unordered_multimap::beginC++11
-
unordered_multimap::bucketC++11
-
unordered_multimap::bucket_countC++11
-
unordered_multimap::bucket_sizeC++11
-
unordered_multimap::cbeginC++11
-
unordered_multimap::cendC++11
-
unordered_multimap::clearC++11
-
unordered_multimap::countC++11
-
unordered_multimap::emplaceC++11
-
unordered_multimap::emplace_hintC++11
-
unordered_multimap::emptyC++11
-
unordered_multimap::endC++11
-
unordered_multimap::equal_rangeC++11
-
unordered_multimap::eraseC++11
-
unordered_multimap::findC++11
-
unordered_multimap::get_allocatorC++11
-
unordered_multimap::hash_functionC++11
-
unordered_multimap::insertC++11
-
unordered_multimap::key_eqC++11
-
unordered_multimap::load_factorC++11
-
unordered_multimap::max_bucket_countC++11
-
unordered_multimap::max_load_factorC++11
-
unordered_multimap::max_sizeC++11
-
unordered_multimap::operator=C++11
-
unordered_multimap::rehashC++11
-
unordered_multimap::reserveC++11
-
unordered_multimap::sizeC++11
-
unordered_multimap::swapC++11
-
non-member overloads
public member function
<unordered_map>
std::unordered_multimap::find
iterator find ( const key_type& k );const_iterator find ( const key_type& k ) const;
Get iterator to element
To obtain a range with all the elements whose key is k you can use member function equal_range.
To just check whether a particular key exists, you can use count.
Parameters
- k
- Key to be searched for.
Member type key_type is the type of the keys for the elements in the container, defined in unordered_multimap as an alias of its first template parameter (Key).
Return value
An iterator to the element, if the specified key value is found, or unordered_multimap::end if the specified key is not found in the container.Member types iterator and const_iterator are forward iterator types.
Example
|
|
Output:
one of the values from 'mom' is: church |
Complexity
Average case: constant.Worst case: linear in container size.
Iterator validity
No changes.See also
- unordered_multimap::equal_range
- Get range of elements with specific key (public member function)
- unordered_multimap::count
- Count elements with a specific key (public member function)
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Spotted an error? contact us