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

From cppreference.com
< cpp‎ | container‎ | array

[edit template]
 
C++
 
Containers library
 
std::array
 
reverse_iterator rbegin() noexcept;
 (1) (since C++11)
(constexpr since C++17)
const_reverse_iterator rbegin() const noexcept;
 (2) (since C++11)
(constexpr since C++17)
const_reverse_iterator crbegin() const noexcept;
 (3) (since C++11)
(constexpr since C++17)

Returns a reverse iterator to the first element of the reversed *this. It corresponds to the last element of the non-reversed *this.

If *this is empty, the returned iterator is equal to rend().

range-rbegin-rend.svg

Contents

[edit] Return value

Reverse iterator to the first element.

[edit] Complexity

Constant.

[edit] Notes

The underlying iterator of the returned reverse iterator is the end iterator. Hence the returned iterator is invalidated if and when the end iterator is invalidated.

[edit] Example

Run this code
#include <algorithm>
#include <array>
#include <iostream>
#include <string>
#include <string_view>
 
void print(const std::string_view s) { std::cout << s << ' '; }
 
int main()
{
    const std::array<std::string_view, 8> data
    {
        "▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"
    };
    std::array<std::string, 8> arr;
 
    std::copy(data.cbegin(), data.cend(), arr.begin());
 
    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);
}

Output: 

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

[edit] See also

 returns a reverse iterator to the end
(public member function) [edit]
(C++14)
 returns a reverse iterator to the beginning of a container or array
(function template) [edit]
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