Louis Dionne 4d08eccd63
[libc++] Implement P2538R1 "ADL-proof std::projected" (#65411)
Notice that because Holder<Incomplete> is _possible_ to complete, but
_unsafe_ to complete, that means that Holder<Incomplete>* is basically
not an iterator and it's not even safe to ask if
input_iterator<Holder<Incomplete>*> because that _will_ necessarily
complete the type. So it's totally expected that we still cannot safely
ask e.g.


static_assert(std::indirect_unary_predicate<bool(&)(Holder<Incomplete>&),
Holder<Incomplete>*>);

or even

static_assert(!std::indirect_unary_predicate<int, Holder<Incomplete>*>);

This was originally uploaded as https://reviews.llvm.org/D119029 and I
picked it up here as part of the Github PR transition.

Co-authored-by: Arthur O'Dwyer <arthur.j.odwyer@gmail.com>
2023-09-15 10:09:38 -04:00
..

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