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

function template

<iterator>

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

Subtraction operator

The function returns the same as subtracting the base iterators of lhs and rhs.

This operator is also overloaded as a member function to return a move iterator offset by -n element positions (see move_iterator::operator-).

lhs, rhs

move_iterator objects (to the left- and right-hand side of the operator, respectively) for whose base iterators the subtraction operation is defined.

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// subtracting move_iterators
#include <iostream>     // std::cout
#include <iterator>     // std::move_iterator
#include <string>       // std::string

int main () {
  std::string foo[] = {"one","two","three"};

  std::move_iterator<std::string*> from (foo);
  std::move_iterator<std::string*> until (foo);
  until += sizeof(foo)/sizeof(std::string);

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

  return 0;
}

operator+ (move_iterator)

Addition operator (function template)

move_iterator::operator-

Subtraction operator (public member function)

move_iterator::operator-=

Decrease iterator (public member function)

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