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Showing content from https://cplusplus.github.io/LWG/issue4163 below:

do_get for bool call the overload for long?

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Section: 28.3.4.3.2.3 [facet.num.get.virtuals] Status: Tentatively NAD Submitter: Jiang An Opened: 2024-09-29 Last modified: 2025-02-07

Priority: Not Prioritized

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Discussion:

28.3.4.3.2.3 [facet.num.get.virtuals]/6 currently says:

Effects: If (str.flags()&ios_base::boolalpha) == 0 then input proceeds as it would for a long except that if a value is being stored into val, […]

It is unclear whether an implementation is allowed to call the overload for long in this case. Currently, libc++'s version calls that overload, while libstdc++ and MSVC STL's don't (example).

[2025-02-07; Reflector poll: NAD]

I think this is just a libc++ bug. The wording says it "proceeds as it would for long", which is not the same as actually making a virtual call to do_get for long. It can either duplicate the code from do_get for long, or make a non-virtual (i.e. qualified) call to num_get::do_get.

Proposed resolution:

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