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std::array<T,N>::rend, std::array<T,N>::crend

From cppreference.com
< cpp‎ | container‎ | array
reverse_iterator rend() noexcept;
(until C++17)
constexpr reverse_iterator rend() noexcept;
(since C++17)
const_reverse_iterator rend() const noexcept;
(until C++17)
constexpr const_reverse_iterator rend() const noexcept;
(since C++17)
const_reverse_iterator crend() const noexcept;
(until C++17)
constexpr const_reverse_iterator crend() const noexcept;
(since C++17)

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

range-rbegin-rend.svg

Contents

[edit] Parameters

(none)

[edit] Return value

Reverse iterator to the element following the last element.

[edit] Complexity

Constant.


[edit] Example

#include <algorithm>
#include <array>
#include <iostream>
 
int main()
{
    std::array<int, 11> a {1, 11, 11, 35, 0, 12, 79, 76, 76, 69, 40};
 
    // print elements of array in reverse order using const_reverse_iterator`s
    std::for_each(a.crbegin(), a.crend(), [](int e){ std::cout << e << ' '; });
    //              ^^           ^^
    std::cout << '\n';
 
    // modify each element of array using non-const reverse_iterator`s
    std::for_each(a.rbegin(), a.rend(), [](int& e){ e += 32; });
    //              ^           ^             ^
 
    // print elements as chars in reverse order using const_reverse_iterator`s
    std::for_each(a.crbegin(), a.crend(), [](char e){ std::cout << e; });
    //              ^^           ^^          ^^^^
    std::cout << '\n';
}

Output:

40 69 76 76 79 12 0 35 11 11 1 
Hello, C++!

[edit] See also

returns a reverse iterator to the beginning
(public member function) [edit]