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Showing content from https://cplusplus.com/array::rbegin below:

public member function

<array>

std::array::rbegin 
      reverse_iterator rbegin() noexcept;const_reverse_iterator rbegin() const noexcept;

Return reverse iterator to reverse beginning

Returns a reverse iterator pointing to the last element in the array container.

rbegin points to the element right before the one that would be pointed to by member end.

Notice that unlike member array::back, which returns a reference to this same element, this function returns a reverse random access iterator.



Parameters none

Return Value A reverse iterator to the reverse beginning of the sequence.

If the array object is const-qualified, the function returns a const_iterator. Otherwise, it returns an iterator.

Member types reverse_iterator and const_reverse_iterator are reverse random access iterator types (pointing to an element and to a const element, respectively). See vector member types.



Example 
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// array::rbegin/rend
#include <iostream>
#include <array>

int main ()
{
  std::array<int,4> myarray = {4, 26, 80, 14} ;

  std::cout << "myarray contains:";
  for ( auto rit=myarray.rbegin() ; rit < myarray.rend(); ++rit )
    std::cout << ' ' << *rit;

  std::cout << '\n';

  return 0;
}

Output: 
myarray contains: 14 80 26 4

Notice how the reverse iterator iterates through the vector in a reverse way by increasing the iterator.

Complexity Constant.

Iterator validity No changes.

Data races No contained elements are accessed by the call, but the iterator returned can be used to access or modify elements. Concurrently accessing or modifying different elements is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.

See also
array::crbegin
Return const_reverse_iterator to reverse beginning (public member function)
array::back
Access last element (public member function)
array::rend
Return reverse iterator to reverse end (public member function)
array::begin
Return iterator to beginning (public member function)
array::end
Return iterator to end (public member function)

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