std::array<T,N>::rbegin, std::array<T,N>::crbegin

 

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)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

vector<bool>

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)

Iterator invalidation

Member function table

Non-member function table

 

std::array

Member types

Member functions

Element access

array::at

array::operator[]

array::front

array::back

array::data

Iterators

array::beginarray::cbegin

array::endarray::cend

array::rbeginarray::crbegin

array::rendarray::crend

Capacity

array::empty

array::size

array::max_size

Modifiers

array::fill

array::swap

Non-member functions

get

std::swap

to_array (C++20)

operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

Helper classes

tuple_size

tuple_element

Deduction guides(C++17)

 

	(1)
reverse_iterator rbegin() noexcept;			(until C++17)
constexpr reverse_iterator rbegin() noexcept;			(since C++17)
		(2)
const_reverse_iterator rbegin() const noexcept;				(until C++17)
constexpr const_reverse_iterator rbegin() const noexcept;				(since C++17)
			(3)
const_reverse_iterator crbegin() const noexcept;					(until C++17)
constexpr const_reverse_iterator crbegin() const noexcept;					(since C++17)

Returns a reverse iterator to the first element of the reversed array. It corresponds to the last element of the non-reversed array. If the array is empty, the returned iterator is equal to rend().

Parameters

(none)

Return value

Reverse iterator to the first element.

Complexity

Constant.

Example

Run this code

#include <algorithm>
#include <array>
#include <iostream>
#include <string>
#include <string_view>
 
int main()
{
    constexpr std::array<std::string_view, 8> data = {"▁","▂","▃","▄","▅","▆","▇","█"};
 
    std::array<std::string, std::size(data)> arr;
 
    std::copy(data.cbegin(), data.cend(), arr.begin());
    //             ^              ^           ^
 
    auto print = [](const std::string_view s) { std::cout << s << ' '; };
 
    print("Print 'arr' in direct order using [cbegin, cend):\t");
    std::for_each(arr.cbegin(), arr.cend(), print);
    //                ^             ^
    print("\n\nPrint 'arr' in reverse order using [crbegin, crend):\t");
    std::for_each(arr.crbegin(), arr.crend(), print);
    //                ^^             ^^
    print("\n");
}

Output:

Print 'arr' in direct order using [cbegin, cend):        ▁ ▂ ▃ ▄ ▅ ▆ ▇ █
 
Print 'arr' in reverse order using [crbegin, crend):     █ ▇ ▆ ▅ ▄ ▃ ▂ ▁

See also

rend crend (C++11)	returns a reverse iterator to the end (public member function)
rbegincrbegin (C++14)	returns a reverse iterator to the beginning of a container or array (function template)