9 Iterators library [iterators]

9.7 Iterator adaptors [iterators.predef]

9.7.1 Reverse iterators [iterators.reverse]

9.7.1.2 reverse_iterator operations [reverse.iter.ops]

9.7.1.2.19 operator- [reverse.iter.opdiff]

template <class I1, class I2> requires SizedSentinel<I1, I2> constexpr difference_type_t<I2> operator-( const reverse_iterator<I1>& x, const reverse_iterator<I2>& y);

1

Effects: Equivalent to: return y.current - x.current;