deduction guides for std::ranges::take_while_view

Defined in header <ranges>
template< class R, class Pred >
take_while_view( R&&, Pred ) -> take_while_view<views::all_t<R>, Pred>;
(since C++20)

The deduction guide is provided for std::ranges::take_while_view to allow deduction from range and predicate.

If R is a view, the deduced type is take_while_view<R>; otherwise, the deduced type is usually take_while_view<ranges::ref_view<R>>.


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