ADL-proof implementation of range verifying and functor passing components that involve arbitrary types #4402
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These code paths don't handle ADL-incompatible iterators, and `_STD` is added for consistency.
Currently, the C++23 additions renders `span` not supporting ADL-incompatible element types. Perhaps we should fix this in vNext.
`_To_absolute_time` remains unqualified because I don't believe `_Rep` is allowed to be an ADL-incompatible type.
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StephanTLavavej
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Feb 19, 2024
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Towards #140. Fixes #1596. IIUC remaining unqualified
_Adl_verify_rangecalls after this PR are not supposed to involve ADL-incompatible iterators.Affected components:
ranges::advance(non-sized branch)ranges::distance(non-sized branch)spanconstructorscondition_variable::wait_forNotes:
_STD-qualification is also made instd::advanceandstd::distancefor consistency, but IIUC these code paths don't handle ADL-incompatible iterators._To_absolute_timeremains unqualified, because valid_Repinchrono::duration<_Rep, _Period>requires_Repto be "arithmetic-like" type (although the requirements are unclear), and thus must not be ADL-incompatible.span<holder<incomplete>*>can't be supported in C++23 mode becauseconst_iterator<_Span_iterator<holder<incomplete>*>>is ill-formed due to ADL in constraints checking. I guess this might need to be fixed in vNext.