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824. rvalue ref issue with basic_string inserter

Section: 23.4.4.4 [string.io] Status: CD1 Submitter: Alisdair Meredith Opened: 2008-04-10 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

In the current working paper, the <string> header synopsis at the end of 23.4 [string.classes] lists a single operator<< overload for basic_string.

template<class charT, class traits, class Allocator>
 basic_ostream<charT, traits>&
   operator<<(basic_ostream<charT, traits>&& os,
              const basic_string<charT,traits,Allocator>& str);

The definition in 23.4.4.4 [string.io] lists two:

template<class charT, class traits, class Allocator>
 basic_ostream<charT, traits>&
   operator<<(basic_ostream<charT, traits>& os,
              const basic_string<charT,traits,Allocator>& str);

template<class charT, class traits, class Allocator>
 basic_ostream<charT, traits>&
   operator<<(basic_ostream<charT, traits>&& os,
              const basic_string<charT,traits,Allocator>& str);

I believe the synopsis in 23.4 [string.classes] is correct, and the first of the two signatures in 23.4.4.4 [string.io] should be deleted.

Proposed resolution:

Delete the first of the two signatures in 23.4.4.4 [string.io]:

template<class charT, class traits, class Allocator>
 basic_ostream<charT, traits>&
   operator<<(basic_ostream<charT, traits>& os,
              const basic_string<charT,traits,Allocator>& str);

template<class charT, class traits, class Allocator>
 basic_ostream<charT, traits>&
   operator<<(basic_ostream<charT, traits>&& os,
              const basic_string<charT,traits,Allocator>& str);