Hi,
I am in the midst of migrating
some projects into VS 2008, and have downloaded and built the boost library
from the SVN Trunk (retrieved on 18 December, 2007 @ 4:09 pm) which seems to
satisfy support for VS 2008. However, I was having a problem compiling
some code that calls the macro BOOST_SHARED_POINTER_EXPORT
(the code uses Boost serialization on some
shared_ptr objects). I was running into the following
error:
MyOuterClass.h(11) : error
C2371:
'`anonymous-namespace'::boost_serialization_guid_initializer___LINE___1' :
redefinition; different basic types
MyOuterClass.h(10) : see declaration of
'`anonymous-namespace'::boost_serialization_guid_initializer___LINE___1'
The issue seems to be located in
the BOOST_CLASS_EXPORT_GUID_1 macro, line 160 in serialization/export.hpp.
The following macro is not expanding as
desired:
#define
BOOST_CLASS_EXPORT_GUID_1(T, K) \
...
BOOST_PP_CAT(boost_serialization_guid_initializer_, __LINE__ ##
_1) \
I believe the
author of this line intended that __LINE__ would be replaced with a line
number where the macro is implicitly called from, and THEN concatenated with
the _1 token. Unfortunately, it seems that the two tokens are
concatenated first creating __LINE___1 in the process. I have a trivial
workaround:
#define EXPAND(x)
x
#define
BOOST_CLASS_EXPORT_GUID_1(T, K) \
...
BOOST_PP_CAT(boost_serialization_guid_initializer_, EXPAND(__LINE__) ##
_1) \
This allows me to compile
without the error (under VS 2008). Please advise if there is a better or
more appropriate solution. Also, I wasn’t sure whether _1 was a token
literal or an mpl (Boost Metaprogramming library)
placeholder.
I realize that 1.35 is not yet
ready for release. So, I’m not expecting everything to work
correctly. So far, this is the only issue I’ve run
into.
Let me know if you need more
information. Thank you for your time!
Best
Regards,
Rich
Turrin