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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../header/../iterator/rbegin.html below:

std::rbegin, std::crbegin - cppreference.com

template< class C > auto rbegin( C& c ) -> decltype(c.rbegin());

(1) (since C++14)
(constexpr since C++17)

template< class C > auto rbegin( const C& c ) -> decltype(c.rbegin());

(2) (since C++14)
(constexpr since C++17) (3) (since C++14)
(constexpr since C++17) (4) (since C++14)
(constexpr since C++17)

template< class C > auto crbegin( const C& c ) -> decltype(std::rbegin(c));

(5) (since C++14)
(constexpr since C++17)

Returns an iterator to the reverse-beginning of the given range.

1,2) Returns c.rbegin(), which is typically an iterator to the reverse-beginning of the sequence represented by c.

1)

C

is a standard

Container

, returns a

C::reverse_iterator

object.

2)

C

is a standard

Container

, returns a

C::const_reverse_iterator

object.

5) Returns std::rbegin(c), with c always treated as const-qualified.

C

is a standard

Container

, returns a

C::const_reverse_iterator

object.

[edit] Parameters c - a container or view with a rbegin member function array - an array of arbitrary type il - an std::initializer_list [edit] Return value

1,2) c.rbegin()

5) c.rbegin()

[edit] Exceptions

May throw implementation-defined exceptions.

[edit] Overloads

Custom overloads of rbegin may be provided for classes and enumerations that do not expose a suitable rbegin() member function, yet can be iterated.

[edit] Notes

The overload for std::initializer_list is necessary because it does not have a member function rbegin.

[edit] Example

#include <iostream>
#include <iterator>
#include <vector>
 
int main()
{
    std::vector<int> v = {3, 1, 4};
    auto vi = std::rbegin(v); // the type of âviâ is std::vector<int>::reverse_iterator
    std::cout << "*vi = " << *vi << '\n';
 
    *std::rbegin(v) = 42; // OK: after assignment v[2] == 42
//  *std::crbegin(v) = 13; // error: the location is read-only
 
    int a[] = {-5, 10, 15};
    auto ai = std::rbegin(a); // the type of âaiâ is std::reverse_iterator<int*>
    std::cout << "*ai = " << *ai << '\n';
 
    auto il = {3, 1, 4};
    // the type of âitâ below is std::reverse_iterator<int const*>:
    for (auto it = std::rbegin(il); it != std::rend(il); ++it)
        std::cout << *it << ' ';
    std::cout << '\n';
}

Output:

[edit] See also returns an iterator to the beginning of a container or array
(function template) [edit] returns an iterator to the end of a container or array
(function template) [edit] returns a reverse end iterator for a container or array
(function template) [edit] returns a reverse iterator to a range
(customization point object)[edit] returns a reverse iterator to a read-only range
(customization point object)[edit]

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