cppreference.com
Create account
Log in
Namespaces
Page
Discussion
Variants
Views
View
Edit
History
Actions
std::unordered_set<Key,Hash,KeyEqual,Allocator>::
hash_function
From cppreference.com
<
cpp
|
container
|
unordered set
[edit template]
C++
Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros
(C++20)
Language support library
Concepts library
(C++20)
Metaprogramming library
(C++11)
Diagnostics library
General utilities library
Strings library
Containers library
Iterators library
Ranges library
(C++20)
Algorithms library
Numerics library
Localizations library
Input/output library
Filesystem library
(C++17)
Regular expressions library
(C++11)
Concurrency support library
(C++11)
Execution support library
(C++26)
Technical specifications
Symbols index
External libraries
[edit]
Containers library
Sequence
array
(C++11)
vector
vector
<bool>
inplace_vector
(C++26)
deque
forward_list
(C++11)
list
Associative
set
multiset
map
multimap
Unordered associative
unordered_set
(C++11)
unordered_multiset
(C++11)
unordered_map
(C++11)
unordered_multimap
(C++11)
Adaptors
stack
queue
priority_queue
flat_set
(C++23)
flat_multiset
(C++23)
flat_map
(C++23)
flat_multimap
(C++23)
Views
span
(C++20)
mdspan
(C++23)
Tables
Iterator invalidation
Member function table
Non-member function table
[edit]
std::unordered_set
Member types
Member functions
unordered_set::unordered_set
unordered_set::~unordered_set
unordered_set::operator=
unordered_set::get_allocator
Iterators
unordered_set::begin
unordered_set::cbegin
unordered_set::end
unordered_set::cend
Capacity
unordered_set::size
unordered_set::max_size
unordered_set::empty
Modifiers
unordered_set::clear
unordered_set::erase
unordered_set::swap
unordered_set::extract
(C++17)
unordered_set::merge
(C++17)
unordered_set::insert
unordered_set::insert_range
(C++23)
unordered_set::emplace
unordered_set::emplace_hint
Lookup
unordered_set::count
unordered_set::find
unordered_set::contains
(C++20)
unordered_set::equal_range
Bucket interface
unordered_set::begin
(size_type)
unordered_set::cbegin
(size_type)
unordered_set::end
(size_type)
unordered_set::cend
(size_type)
unordered_set::bucket_count
unordered_set::max_bucket_count
unordered_set::bucket_size
unordered_set::bucket
Hash policy
unordered_set::load_factor
unordered_set::max_load_factor
unordered_set::rehash
unordered_set::reserve
Observers
unordered_set::hash_function
unordered_set::key_eq
Non-member functions
operator==
operator!=
(until C++20)
std::swap
(std::unordered_set)
erase_if
(std::unordered_set)
(C++20)
Deduction guides
(C++17)
[edit]
hasher hash_function
(
)
const
;
(since C++11)
Returns the function that hashes the keys.
Contents
1
Parameters
2
Return value
3
Complexity
4
See also
[
edit
]
Parameters
(none)
[
edit
]
Return value
The hash function.
[
edit
]
Complexity
Constant.
[
edit
]
See also
key_eq
returns the function used to compare keys for equality
(public member function)
[edit]