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Returns the bounds of a range that includes all the elements in the container that compare equal to k.
If k does not match any element in the container, the range returned has end as both its lower and upper range bounds.
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_set>
-
unordered_multisetC++11
-
unordered_setC++11
unordered_multiset
-
unordered_multiset::~unordered_multisetC++11
-
unordered_multiset::unordered_multisetC++11
member functions
-
unordered_multiset::beginC++11
-
unordered_multiset::bucketC++11
-
unordered_multiset::bucket_countC++11
-
unordered_multiset::bucket_sizeC++11
-
unordered_multiset::cbeginC++11
-
unordered_multiset::cendC++11
-
unordered_multiset::clearC++11
-
unordered_multiset::countC++11
-
unordered_multiset::emplaceC++11
-
unordered_multiset::emplace_hintC++11
-
unordered_multiset::emptyC++11
-
unordered_multiset::endC++11
-
unordered_multiset::equal_rangeC++11
-
unordered_multiset::eraseC++11
-
unordered_multiset::findC++11
-
unordered_multiset::get_allocatorC++11
-
unordered_multiset::hash_functionC++11
-
unordered_multiset::insertC++11
-
unordered_multiset::key_eqC++11
-
unordered_multiset::load_factorC++11
-
unordered_multiset::max_bucket_countC++11
-
unordered_multiset::max_load_factorC++11
-
unordered_multiset::max_sizeC++11
-
unordered_multiset::operator=C++11
-
unordered_multiset::rehashC++11
-
unordered_multiset::reserveC++11
-
unordered_multiset::sizeC++11
-
unordered_multiset::swapC++11
-
non-member overloads
- Reference
- <unordered_set>
- unordered_multiset
- equal_range
public member function
<unordered_set>
std::unordered_multiset::equal_range
pair<iterator,iterator> equal_range ( const key_type& k );pair<const_iterator,const_iterator> equal_range ( const key_type& k ) const;
Get range of elements with specific key
If k does not match any element in the container, the range returned has end as both its lower and upper range bounds.
Parameters
- k
- Value to be compared.
Member type key_type is the type of the elements in the container. In unordered_set containers it is the same as value_type, defined as an alias of the class's first template parameter (Key).
Return value
The function returns a pair, where its member pair::first is an iterator to the lower bound of the range, and pair::second is an iterator to its upper bound. The elements in the range are those between these two iterators, including pair::first, but not pair::second.Member types iterator and const_iterator are forward iterator types.
Example
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Output:
These pigs were found: pig pig pig |
Complexity
Average case: constant.Worst case: linear in container size.
Iterator validity
No changes.See also
- unordered_multiset::count
- Count elements with a specific key (public member function)
- unordered_multiset::find
- Get iterator to element (public member function)
- unordered_multiset::begin
- Return iterator to beginning (public member type)
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Spotted an error? contact us