std::unordered_map
cppreference.com
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template< class Key, class T, class Hash = std::hash<Key>, class KeyEqual = std::equal_to<Key>, class Allocator = std::allocator< std::pair<const Key, T> > > class unordered_map; |
(since C++11) | |
Unordered map Key Key Value . , , .
std::unordered_map meets the requirements of Container, AllocatorAwareContainer, UnorderedAssociativeContainer.
Member types
| Member type | Definition |
key_type
|
|
mapped_type
|
T
|
value_type
|
std::pair<const Key, T>
|
size_type
|
(unsigned int) ( std::size_t) |
difference_type
|
(signed int) ( std::ptrdiff_t) |
hasher
|
Hash
|
key_equal
|
KeyEqual
|
allocator_type
|
|
reference
|
value_type&
|
const_reference
|
const value_type&
|
pointer
|
std::allocator_traits<Allocator>::pointer
|
const_pointer
|
std::allocator_traits<Allocator>::const_pointer
|
iterator
|
ForwardIterator
|
const_iterator
|
(constant) (iterator) |
local_iterator
|
An iterator type whose category, value, difference, pointer and reference types are the same as iterator. This iteratorcan be used to iterate through a single bucket but not across buckets |
const_local_iterator
|
An iterator type whose category, value, difference, pointer and reference types are the same as const_iterator. This iteratorcan be used to iterate through a single bucket but not across buckets |
Member functions
:cpp/container/dsc begin(int):cpp/container/dsc end(int)unordered_map . (public member function) | |
unordered_map . (public member function) | |
| . (public member function) | |
| . (public member function) | |
Iterators | |
| (iterator) . (public member function) | |
| (iterator) . (public member function) | |
Capacity | |
| . (public member function) | |
| . (public member function) | |
| . (public member function) | |
Modifiers | |
| . (public member function) | |
| . (public member function) | |
| . (public member function) | |
| constructs elements in-place using a hint (public member function) | |
| (public member function) | |
| (public member function) | |
Lookup | |
| access specified element with bounds checking (public member function) | |
| (public member function) | |
| . (public member function) | |
| . (public member function) | |
| returns range of elements matching a specific key (public member function) | |
Bucket interface | |
| returns the number of buckets (public member function) | |
| returns the maximum number of buckets (public member function) | |
| returns the number of elements in specific bucket (public member function) | |
| returns the bucket for specific key (public member function) | |
Hash policy | |
| returns average number of elements per bucket (public member function) | |
| manages maximum average number of elements per bucket (public member function) | |
| reserves at least the specified number of buckets. This regenerates the hash table. (public member function) | |
| reserves space for at least the specified number of elements. This regenerates the hash table. (public member function) | |
Observers | |
| returns function used to hash the keys (public member function) | |
| returns the function used to compare keys for equality (public member function) | |
Non-member functions
| compares the values in the unordered_map (function template) | |
| specializes the std::swap algorithm (function template) |