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Showing content from https://cplusplus.com/reference/iterator/reverse_iterator/operator-=/ below:

public member function

<iterator>

reverse_iterator& operator-= (difference_type n);

Retrocede iterator

Internally, the function increases by n the base iterator kept by the object (as if applying operator+= to it).

Note that this function requires the base iterator to be a random-access iterator.

n

Number of elements to offset.
Member type difference_type is an alias of the base iterator's own difference type.

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// reverse_iterator::operator- 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);	// myvector: 0 1 2 3 4 5 6 7 8 9

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

  std::reverse_iterator<iter_type> rev_iterator = myvector.rend();

  rev_iterator -= 4;

  std::cout << "rev_iterator now points to: " << *rev_iterator << '\n';

  return 0;
}

rev_iterator now points to: 3

reverse_iterator::operator+=

Advance iterator (public member function)

reverse_iterator::operator--

Decrease iterator position (public member function)

reverse_iterator::operator-

Subtraction operator (public member function)

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