# operator-(ranges::adjacent_view::sentinel)

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< cpp‎ | 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

| This section is incomplete Reason: no example

### See also

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