template< class Iterator1, class Iterator2 >
auto operator-( const move_iterator<Iterator1>& lhs,
                const move_iterator<Iterator2>& rhs ) -> decltype(lhs.base() - rhs.base());  |  (since C++11) | 
Returns the distance between two iterator adaptors.
Parameters
| lhs, rhs | - | iterator adaptors to compute the difference of | 
Return value
lhs.base() - rhs.base().
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