[boost] [Serialization] this seems wrong

Subject: [boost] [Serialization] this seems wrong
From: Kenny Riddile (kfriddile_at_[hidden])
Date: 2008-11-26 11:05:47

I'm somewhat inexperienced with boost serialization, so forgive me if 
I'm just missing something.  I have a few simple classes that are all 
serializable.  In each class's header, I have

BOOST_CLASS_EXPORT( ClassName )

right after the class declaration.  All of these classes are 
header-only, so there is no cpp.  All of these classes are very similar, 
so the statement above is often on the same line of the file (line 21 in 
this case).  When I include all of these headers in a single source 
file, I get errors like this:

1>Win32WindowImpl.cpp
1>c:\subversion\trunk\vfx\platform\include\messages\minimized.hpp(21) : 
error C2371: 
'vfx::platform::`anonymous-namespace'::boost_serialization_guid_initializer_21' 
: redefinition; different basic types
1> c:\subversion\trunk\vfx\platform\include\messages\close.hpp(21) : see 
declaration of 
'vfx::platform::`anonymous-namespace'::boost_serialization_guid_initializer_21'
1>c:\subversion\trunk\vfx\platform\include\messages\restored.hpp(21) : 
error C2371: 
'vfx::platform::`anonymous-namespace'::boost_serialization_guid_initializer_21' 
: redefinition; different basic types
1> c:\subversion\trunk\vfx\platform\include\messages\close.hpp(21) : see 
declaration of 
'vfx::platform::`anonymous-namespace'::boost_serialization_guid_initializer_21'

I walked down into the BOOST_CLASS_EXPORT macro and saw that the 
BOOST_CLASS_EXPORT_GUID macro appends the line number (notice the 21's 
in the above compiler output) to what it generates.  Thinking to myself, 
"this will never work", I simply went and added empty lines to the 
header files so that the BOOST_CLASS_EXPORT( ClassName ) was on a 
different line in each and everything compiled.  Am I missing something? 
   Is this fixed in 1.37 (I'm currently forced to use 1.36). If I wanted 
white-space to matter, I would be writing python :)