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

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< cpp‎ | 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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