friend constexpr bool operator==( const ranges::iterator_t<Base>& x,
                                  const /*sentinel*/& y );
(since C++20)

Compares a take_while_view::/*sentinel*/ with an iterator into (possibly const-qualified) view V. The iterator is typically obtained from a call to take_while_view::begin.

Returns true if x compares equal to the underlying sentinel of y (i.e. y.base()), or if the predicate returns false when applied to *x.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when take_while_view::sentinel<Const> is an associated class of the arguments.

The != operator is synthesized from operator==.


x - iterator to compare
y - sentinel to compare

Return value

y.end_ == x || !std::invoke(*y.pred_, *x), where end_ denotes the stored sentinel and pred_ denotes the stored pointer to predicate.


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