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operator-(ranges::slide_view::sentinel)

friend constexpr ranges::range_difference_t<V>
operator-( const /*iterator*/<false>& x, const /*sentinel*/& y )
    requires std::sized_sentinel_for<ranges::sentinel_t<V>,
                                     ranges::iterator_t<V>>;
 (1) (since C++23) 
friend constexpr ranges::range_difference_t<V>
operator-( const /*sentinel*/& y, const /*iterator*/<false>& x )
    requires std::sized_sentinel_for<ranges::sentinel_t<V>,
                                     ranges::iterator_t<V>>;
 (2) (since C++23)

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

Let last_ele_ denote the underlying iterator of x and end_ denote the underlying sentinel of y.

1) Equivalent to: return x.last_ele_ - y.end_;.
2) Equivalent to: return y.end_ - x.last_ele_;.

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

Parameters

x - an iterator
y - a sentinel

Return value

The distance between the iterator and the sentinel.

Example

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