Re: [Boost-bugs] [Boost C++ Libraries] #3234: XML Serialization error when loading class that inherits from wstring

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3234: XML Serialization error when loading class that inherits from wstring
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-10-11 22:37:55

#3234: XML Serialization error when loading class that inherits from wstring
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  Reporter:  nitram.cero@…            |       Owner:  ramey                              
      Type:  Bugs                     |      Status:  closed                             
 Milestone:  Boost 1.40.0             |   Component:  serialization                      
   Version:  Boost Development Trunk  |    Severity:  Problem                            
Resolution:  wontfix                  |    Keywords:  serialization wstring derived class
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Changes (by ramey):

  * status:  new => closed
  * resolution:  => wontfix

Comment:

 OK - I looked into this.

 I'm not sure what you're trying to do, but here is what I've found.

 The "official" std::wstring works fine. It is marked as primitive and has
 special code inside of basic_text_iprimitive to handle it.

 Your "object:" version also works as expected. When using xml_archives
 tags are required for elements.  There might be a way to suppress/override
 this but if there is I don't remember what it is.

 your "primitive:" version fails with the string "This is..".  Since the
 type is marked primitive, when it comes time to load the string the
 following is called:

 is >> t where t is of type primitive::wstring

 since primitive::wstring is derived from std::string and t is passed by
 reference, t get's "promoted" to std::wstring for the is >> t operation.
 This operation is implemented by the standard library so that it stops
 when it gets a space.  So you don't get the whole string back.  Now things
 are out of whack when the end tag is searched for and the program bombs.

 Robert Ramey

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3234#comment:8>
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