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665. do_unshift return value

Section: 28.3.4.2.5.3 [locale.codecvt.virtuals] Status: CD1 Submitter: Thomas Plum Opened: 2007-04-16 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

28.3.4.2.5.3 [locale.codecvt.virtuals], para 8 says:

codecvt<char,char,mbstate_t>, returns noconv.

The following objection has been raised:

Despite what the C++ Standard says, unshift can't always return noconv for the default facets, since they can be nontrivial. At least one implementation does whatever the C functions do.

[Plum ref _222152Y62]

Proposed resolution:

Change 28.3.4.2.5.3 [locale.codecvt.virtuals], p8:

Returns: An enumeration value, as summarized in Table 76:

...

codecvt<char,char,mbstate_t>, returns noconv.