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

From cppreference.com

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)
Diagnostics library
Memory management library
Metaprogramming library(C++11)
General utilities library
Containers library
Iterators library
Ranges library(C++20)
Algorithms library
Strings library
Text processing library
Numerics library
Date and time library
Input/output library
Filesystem library(C++17)
Concurrency support library(C++11)
Execution control library(C++26)
Technical specifications
Symbols index
External libraries

unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator
Iterators
unordered_map::beginunordered_map::cbegin
unordered_map::endunordered_map::cend
Capacity
unordered_map::size
unordered_map::max_size
unordered_map::empty
Modifiers
unordered_map::clear
unordered_map::erase
unordered_map::swap
unordered_map::extract (C++17)
unordered_map::merge (C++17)
unordered_map::insert
unordered_map::insert_range (C++23)
unordered_map::insert_or_assign (C++17)
unordered_map::emplace
unordered_map::emplace_hint
unordered_map::try_emplace (C++17)

Lookup
unordered_map::at
unordered_map::operator[]
unordered_map::count
unordered_map::find
unordered_map::contains (C++20)
unordered_map::equal_range
Bucket interface
unordered_map::begin(size_type)unordered_map::cbegin(size_type)
unordered_map::end(size_type)unordered_map::cend(size_type)
unordered_map::bucket_count
unordered_map::max_bucket_count
unordered_map::bucket_size
unordered_map::bucket
Hash policy
unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve
Observers
unordered_map::hash_function
unordered_map::key_eq

(until C++20)

std::swap(std::unordered_map)
erase_if(std::unordered_map) (C++20)

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