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operator-(ranges::elements_view::sentinel) 

template< bool OtherConst >
  requires std::sized_sentinel_for<ranges::sentinel_t<Base>,
                                   ranges::iterator_t</*maybe-const*/<OtherConst, V>>>
friend constexpr ranges::range_difference_t</*maybe-const*/<OtherConst, V>>
  operator-( const /*iterator*/<OtherConst>& x, const /*sentinel*/& y );
 (1) (since C++20) 
template< bool OtherConst >
  requires std::sized_sentinel_for<ranges::sentinel_t<Base>,
                                   ranges::iterator_t</*maybe-const*/<OtherConst, V>>>
friend constexpr ranges::range_difference_t</*maybe-const*/<OtherConst, V>>
  operator-( const /*sentinel*/& y, const /*iterator*/<OtherConst>& x );
 (2) (since C++20)

Computes the distance between the underlying iterator of x and the underlying sentinel of y.

These function templates are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when elements_view::sentinel is an associated class of the arguments.

Parameters

x - an iterator
y - a sentinel

Return value

1) x.base() - y.base()
2) y.base() - x.base()

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