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### 361. num_get<>::do_get (..., void*&) checks grouping

Section: 28.4.3.3.3 [facet.num.put.virtuals] Status: NAD Submitter: Martin Sebor Opened: 2002-03-12 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

22.2.2.2.2, p12 specifies that `thousands_sep` is to be inserted only for integral types (issue 282 suggests that this should be done for all arithmetic types).

22.2.2.1.2, p12 requires that grouping be checked for all extractors including that for `void*`.

I don't think that's right. `void*` values should not be checked for grouping, should they? (Although if they should, then `num_put` needs to write them out, otherwise their extraction will fail.)

Proposed resolution:

Change the first sentence of 22.2.2.2.2, p12 from

> Digit grouping is checked. That is, the positions of discarded separators is examined for consistency with use_facet<numpunct<charT> >(loc).grouping(). If they are not consistent then ios_base::failbit is assigned to err.

to

> Except for conversions to void*, digit grouping is checked...

Rationale:

This would be a change: as it stands, the standard clearly specifies that grouping applies to void*. A survey of existing practice shows that most existing implementations do that, as they should.