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Showing content from https://cplusplus.com/reference/iterator/reverse_iterator/base/ below:

public member function

<iterator>

std::reverse_iterator::base 
iterator_type base() const;

Return base iterator

Returns a copy of the base iterator.

The base iterator is an iterator of the same type as the one used to construct the reverse_iterator, but pointing to the element next to the one the reverse_iterator is currently pointing to (a reverse_iterator has always an offset of -1 with respect to its base iterator).



Parameters none

Return value A copy of the base iterator, which iterates in the opposite direction.
Member type iterator_type is the underlying bidirectional iterator type (the class template parameter: Iterator).

Example 
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// reverse_iterator::base example
#include <iostream>     // std::cout
#include <iterator>     // std::reverse_iterator
#include <vector>       // std::vector

int main () {
  std::vector<int> myvector;
  for (int i=0; i<10; i++) myvector.push_back(i);

  typedef std::vector<int>::iterator iter_type;

  std::reverse_iterator<iter_type> rev_end (myvector.begin());
  std::reverse_iterator<iter_type> rev_begin (myvector.end());

  std::cout << "myvector:";
  for (iter_type it = rev_end.base(); it != rev_begin.base(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';

  return 0;
}

Output: 
myvector: 0 1 2 3 4 5 6 7 8 9


Data races The object is accessed.
The iterator returned can be used to access or modify elements.

Exception safety Provides the same level of guarantee as the copy constructor of the base iterator.

See also
reverse_iterator::reverse_iterator
Constructs reverse_iterator object (public member function)

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