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operator-(ranges::adjacent_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++23) 
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++23)

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

Let current_ denote the underlying array of iterators in x, and end_ denote the underlying sentinel in y.

1) Equivalent to: return x.current_.back() - y.end_;
2) Equivalent to: return y.end_ - x.current_.back();

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

Parameters

x - an iterator
y - a sentinel

Return value

The distance between x and y.

Example

See also

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https://en.cppreference.com/w/cpp/ranges/adjacent_view/sentinel/operator-