[Boost-bugs] [Boost C++ Libraries] #6374: operator << for exception doesn't work with 0/1 length tuples

Subject: [Boost-bugs] [Boost C++ Libraries] #6374: operator << for exception doesn't work with 0/1 length tuples
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-01-10 10:35:56

#6374: operator << for exception doesn't work with 0/1 length tuples
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 Reporter:  edA-qa mort-ora-y <edA-qa@…>            |       Owner:  emildotchevski
     Type:  Bugs                                    |      Status:  new           
Milestone:  To Be Determined                        |   Component:  exception     
  Version:  Boost 1.46.1                            |    Severity:  Problem       
 Keywords:                                          |  
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 The operator<< for boost exception allows attaching error_info structures.
 As a convenience it also takes a tuple form of those info structures.
 This tuple form does not work if the tuple is empty (0-length) or also if
 it is 1-length.

 This is a compile-time matching issue.

 The attached code shows the compile error (reduced to the essentials).  It
 also includes the workaround which I am currently using (compile with
 WORKAROUND defined). Ideally the non-workaround version should work.

 NOTE: This doesn't appear related to the macro itself. If you simple
 instantiate the exception and error_info tuple and use the operator
 directly the same compile-time error occurs. I've left the MACRO form to
 show the intent.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6374>
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