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2478. Unclear how wstring_convert uses cvtstate

Section: 99 [depr.conversions.string] Status: New Submitter: Jonathan Wakely Opened: 2015-03-04 Last modified: 2017-04-22

Priority: 4

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How do wstring_convert::from_bytes and wstring_convert::to_bytes use the cvtstate member?

Is it passed to the codecvt member functions? Is a copy of it passed to the member functions? "Otherwise it shall be left unchanged" implies a copy is used, but if that's really what's intended there are simpler ways to say so.

Proposed resolution: