[boost] [serialization] impossible to extend xml_iarchive?

Subject: [boost] [serialization] impossible to extend xml_iarchive?
From: Kenny Riddile (kfriddile_at_[hidden])
Date: 2009-06-29 19:57:33

Here I am again...still trying to add a seemingly trivial bit of 
functionality to xml_iarchive by following the directions at:

http://www.boost.org/doc/libs/1_39_0/libs/serialization/doc/derivation.html

In my last post (http://lists.boost.org/boost-users/2009/06/49028.php), 
I was getting several unresolved externals from basic_xml_grammar<char>. 
  I figured I needed to simply explicitly instantiate this template like 
the others.  The first problem with that is that basic_xml_grammar.ipp 
isn't in boost/archive/impl/ like the other ipp's are.  It's in 
serialization's source directory, which I, like most people, had thrown 
away after building Boost.  So after I copied that file into my own 
codebase so I could include it and explicitly instantiate 
basic_xml_grammar<char>, I then got a single unresolved external 
complaining about basic_xml_grammar<char>::init_chset() not being 
defined.  After some more digging, I found that that particular method 
is defined in basic_xml_grammar.cpp which is also in serialization's 
source directory.  Even after all that, I'm still getting some other 
linker errors that nobody here can figure out after hours of trying, but 
the aforementioned issues alone suggest to me that it isn't currently 
possible to extend xml_iarchive by following the instructions in the 
documentation.

-Kenny Riddile