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Showing content from https://cplusplus.com/reference/iterator/reverse_iterator/operator_minus-free/ below:

function template

<iterator>

template <class Iterator>  typename reverse_iterator<Iterator>::difference_type operator- (    const reverse_iterator<Iterator>& lhs,    const reverse_iterator<Iterator>& rhs);

template <class Iterator1, class Iterator2>  auto operator- (const reverse_iterator<Iterator>& lhs,                  const reverse_iterator<Iterator>& rhs)  -> decltype (rhs.base()-lhs.base()) { return rhs.base()-lhs.base(); }

Subtraction operator

The function returns the same as subtracting lhs's base iterator from rhs's base iterator.

lhs, rhs

reverse_iterator

objects (to the left- and right-hand side of the operator, respectively), having both the same template parameter (

Iterator

).

reverse_iterator

objectss (to the left- and right-hand side of the operator, respectively) for whose

base iterators

the subtraction operation is defined.

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// operator- on reverse_iterator
#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);

  std::reverse_iterator<std::vector<int>::iterator> from,until;

  from = myvector.rbegin();
  until = myvector.rend();

  std::cout << "myvector has " << (until-from) << " elements.\n";

  return 0;
}

myvector has 10 elements.

operator+ (reverse_iterator)

Addition operator (function template)

reverse_iterator::operator-

Subtraction operator (public member function)

reverse_iterator::operator-=

Retrocede iterator (public member function)

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