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Showing content from https://cplusplus.github.io/LWG/issue500 below:

do_length cannot be implemented correctly

This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of NAD status.

500. do_length cannot be implemented correctly

Section: 28.3.4.2.6 [locale.codecvt.byname] Status: NAD Submitter: Krzysztof Żelechowski Opened: 2005-05-24 Last modified: 2016-01-28

Priority: Not Prioritized

View all other issues in [locale.codecvt.byname].

View all issues with NAD status.

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:

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