std::deque<T,Allocator>::rend, std::deque<T,Allocator>::crend

 

C++

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Named requirements

Feature test macros (C++20)

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Concepts library (C++20)

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Ranges library (C++20)

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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

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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)

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span (C++20)

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Member function table

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std::deque

Member types

Member functions

deque::deque

deque::~deque

deque::operator=

deque::assign

deque::assign_range (C++23)

deque::get_allocator

Element access

deque::at

deque::operator[]

deque::front

deque::back

Iterators

deque::begindeque::cbegin (C++11)

deque::enddeque::cend (C++11)

deque::rbegindeque::crbegin (C++11)

deque::renddeque::crend (C++11)

Capacity

deque::empty

deque::size

deque::max_size

deque::shrink_to_fit (DR*)

Modifiers

deque::clear

deque::insert

deque::insert_range (C++23)

deque::emplace

deque::erase

deque::push_front

deque::emplace_front (C++11)

deque::prepend_range (C++23)

deque::pop_front

deque::push_back

deque::emplace_back (C++11)

deque::append_range (C++23)

deque::pop_back

deque::resize

deque::swap

Non-member functions

std::swap

eraseerase_if (C++20)(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)

Deduction guides(C++17)

 

	(1)
reverse_iterator rend();			(until C++11)
reverse_iterator rend() noexcept;			(since C++11)
		(2)
const_reverse_iterator rend() const;				(until C++11)
const_reverse_iterator rend() const noexcept;				(since C++11)
const_reverse_iterator crend() const noexcept;			(3)	(since C++11)

Returns a reverse iterator to the element following the last element of the reversed deque. It corresponds to the element preceding the first element of the non-reversed deque. This element acts as a placeholder, attempting to access it results in undefined behavior.

Parameters

(none)

Return value

Reverse iterator to the element following the last element.

Complexity

Constant.

Example

Run this code

#include <algorithm>
#include <iostream>
#include <numeric>
#include <string>
#include <deque>
 
int main()
{
    std::deque<int> nums {1, 2, 4, 8, 16};
    std::deque<std::string> fruits {"orange", "apple", "raspberry"};
    std::deque<char> empty;
 
    // Print deque.
    std::for_each(nums.rbegin(), nums.rend(), [](const int n) { std::cout << n << ' '; });
    std::cout << '\n';
 
    // Sums all integers in the deque nums (if any), printing only the result.
    std::cout << "Sum of nums: "
              << std::accumulate(nums.rbegin(), nums.rend(), 0) << '\n';
 
    // Prints the first fruit in the deque fruits, checking if there is any.
    if (!fruits.empty())
        std::cout << "First fruit: " << *fruits.rbegin() << '\n';
 
    if (empty.rbegin() == empty.rend())
        std::cout << "deque 'empty' is indeed empty.\n";
}

Output:

16 8 4 2 1
Sum of nums: 31
First fruit: raspberry
deque 'empty' is indeed empty.

See also

rbegin crbegin (C++11)	returns a reverse iterator to the beginning (public member function)
rendcrend (C++14)	returns a reverse end iterator for a container or array (function template)