std::multiset<Key,Compare,Allocator>::begin, std::multiset<Key,Compare,Allocator>::cbegin

 

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

 

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

 

std::multiset

Member functions

multiset::multiset multiset::~multiset         multiset::operator= multiset::get_allocator

Iterators multiset::beginmultiset::cbegin (C++11) multiset::endmultiset::cend (C++11) multiset::rbeginmultiset::crbegin (C++11)     multiset::rendmultiset::crend (C++11) Capacity multiset::size multiset::max_size multiset::empty Observers multiset::key_comp multiset::value_comp Modifiers multiset::clear multiset::erase multiset::swap multiset::extract (C++17) multiset::merge (C++17) multiset::insert multiset::insert_range (C++23) multiset::emplace (C++11) multiset::emplace_hint (C++11) Lookup multiset::count multiset::find multiset::contains (C++20) multiset::equal_range multiset::lower_bound multiset::upper_bound

Non-member functions

std::swap(std::multiset) erase_if(std::multiset) (C++20)   operator==operator<=> (C++20) operator!=operator<operator>operator<=operator>= (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)

Deduction guides(C++17)

 

iterator begin();	(1)	(noexcept since C++11)
const_iterator begin() const;	(2)	(noexcept since C++11)
const_iterator cbegin() const noexcept;	(3)	(since C++11)

Returns an iterator to the first element of the multiset.

If the multiset is empty, the returned iterator will be equal to end().

Parameters

(none)

Return value

Iterator to the first element.

Complexity

Constant.

Notes

Because both iterator and const_iterator are constant iterators (and may in fact be the same type), it is not possible to mutate the elements of the container through an iterator returned by any of these member functions.

libc++ backports cbegin() to C++98 mode.

Example

Run this code

#include <iostream>
#include <iterator>
#include <set>
#include <string>
 
int main()
{
    const std::multiset<std::string> words =
    {
        "some", "not", "sorted", "words",
        "will", "come", "out", "sorted",
    };
 
    for (auto it = words.begin(); it != words.end(); )
    {
        auto count = words.count(*it);
        std::cout << *it << ":\t" << count << '\n';
        std::advance(it, count); // all count elements have equivalent keys
    }
}

Output:

come:	1
not:	1
out:	1
some:	1
sorted:	2
will:	1
words:	1

See also

endcend (C++11)	returns an iterator to the end (public member function)
begincbegin (C++11)(C++14)	returns an iterator to the beginning of a container or array (function template)