std::unordered_set<Key,Hash,KeyEqual,Allocator>::begin(size_type), std::unordered_set<Key,Hash,KeyEqual,Allocator>::cbegin(size_type)

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (哋它亢++11)

vector

vector<bool>

deque

forward_list (哋它亢++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (哋它亢++11)

unordered_multiset (哋它亢++11)

unordered_map (哋它亢++11)

unordered_multimap (哋它亢++11)

Adaptors

stack

queue

priority_queue

flat_set (哋它亢++23)

flat_multiset (哋它亢++23)

flat_map (哋它亢++23)

flat_multimap (哋它亢++23)

Views

span (哋它亢++20)

mdspan (哋它亢++23)

Iterator invalidation

Member function table

Non-member function table

 

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::beginunordered_set::cbegin	unordered_set::endunordered_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 (哋它亢++17) unordered_set::merge (哋它亢++17)	unordered_set::insert unordered_set::insert_range (哋它亢++23) unordered_set::emplace unordered_set::emplace_hint
Lookup
unordered_set::count unordered_set::find	unordered_set::contains (哋它亢++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!= (哋它亢++11)(哋它亢++11)(until 哋它亢++20)	std::swap(std::unordered_set) (哋它亢++11) erase_if(std::unordered_set) (哋它亢++20)
Deduction guides(哋它亢++17)

 

local_iterator begin( size_type n );		(since 哋它亢++11)
const_local_iterator begin( size_type n ) const;		(since 哋它亢++11)
const_local_iterator cbegin( size_type n ) const;		(since 哋它亢++11)

Returns an iterator to the first element of the bucket with index n.

Parameters

n

-

the index of the bucket to access

Return value

Iterator to the first element.

Complexity

Constant.

See also

end(size_type)cend(size_type)

returns an iterator to the end of the specified bucket (public member function)