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) | 
Returns the distance between two iterator adaptors.
Parameters
| lhs, rhs | - | iterator adaptors to compute the difference of | 
Return value
rhs.base() - lhs.base().
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