std::experimental::ranges::IndirectUnaryPredicate

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template < class F, class I >

concept bool IndirectUnaryPredicate =
    Readable<I> && CopyConstructible<F> &&
    Predicate<F&, ranges:: value_type_t <I> & > &&
    Predicate<F&, ranges:: reference_t <I>> &&

    Predicate<F&, ranges:: iter_common_reference_t <I>> ;
(ranges TS)