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500. do_length cannot be implemented correctly

Section: 30.4.2.6 [locale.codecvt.byname] Status: NAD Submitter: Krzysztof Żelechowski Opened: 2005-05-24 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

1. codecvt::do_length is of type int;
2. it is assumed to be sort-of returning from_next - from of type ptrdiff_t;
3. ptrdiff_t cannot be cast to an int without data loss.

Contradiction.

Proposed resolution: