[jira] Issue Comment Edited: (STDCXX-689) [LWG #280] std::reverse_iterator missing template assignment operator

["Travis Vitek (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/STDCXX-689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572761#action_12572761 ] 

vitek edited comment on STDCXX-689 at 2/26/08 6:16 PM:
--------------------------------------------------------------

It seems that changing this would introduce a source incompatibility.

  std::vector<int> v;
  std::vector<int>::iterator vi = v.begin();
  
  vi == v.end(); // also for !=, <, <=, >, >= and -

The above code would compile with new versions of the library, but not with older versions of the library. Is this change suitable for 4.2.1? It seems that it should not be.

As an aside, I'm with John Potter on wg issues 179 and 280... ??I think the issue is in support of bad code. Compares should be between two iterators of the same type.??




      was (Author: vitek):
    It seems that changing this would introduce a source incompatibility.

  std::vector<int> v;
  std::vector<int>::iterator vi = v.begin();
  
  vi == v.end(); // also for !=, <, <=, >, >= and -

The above code would compile with new versions of the library, but not with older versions of the library. Is this change suitable for 4.2.1? It seems that it should not be.

As an aside, I'm with John Potter on this issue... ?I think the issue is in support of bad code. Compares should be between two iterators of the same type.??



  
> [LWG #280] std::reverse_iterator missing template assignment operator
> ---------------------------------------------------------------------
>
>                 Key: STDCXX-689
>                 URL: https://issues.apache.org/jira/browse/STDCXX-689
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 24. Iterators
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
>            Reporter: Martin Sebor
>            Priority: Trivial
>             Fix For: 4.2.1
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> LWG Issue 280 added a template assignment operator to reverse_iterator:
> http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#280
> It doesn't look like we ever added the function.
> I'm having trouble coming up with a test case that would reveal its absence so this is just a placeholder to remind us to look into this in more detail to make sure the function really is needed (if not, there's no need to complicate the interface of the template).

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