4163. Can the overload of std::num_get::do_get for bool call the overload for long?

Section: 28.3.4.3.2.3 [facet.num.get.virtuals] Status: New Submitter: Jiang An Opened: 2024-09-29 Last modified: 2024-10-03

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).

As the divergence implementation strategies is observable, perhaps we should clarify on this.

Proposed resolution: