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operator-(std::reverse_iterator) 

template< class Iterator >
typename reverse_iterator<Iterator>::difference_type 
    operator-( const reverse_iterator<Iterator>& lhs,
               const reverse_iterator<Iterator>& rhs );
 (until C++11) 
template< class Iterator1, class Iterator2 >
auto operator-( const reverse_iterator<Iterator1>& lhs,
                const reverse_iterator<Iterator2>& rhs
              ) -> decltype(rhs.base() - lhs.base());
 (since C++11)
(until C++17) 
template< class Iterator1, class Iterator2 >
constexpr auto operator-( const reverse_iterator<Iterator1>& lhs,
                          const reverse_iterator<Iterator2>& rhs
                        ) -> decltype(rhs.base() - lhs.base());
 (since C++17)

Returns the distance between two iterator adaptors.

Parameters

lhs, rhs - iterator adaptors to compute the difference of

Return value

rhs.base() - lhs.base().

Example

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