[boost] [BGL][variant] problem with strong_components.hpp and variant

Subject: [boost] [BGL][variant] problem with strong_components.hpp and variant
From: Nil Geisweiller (ngeiswei_at_[hidden])
Date: 2009-10-27 01:31:22

Hi,

I resend that email with the right title header.

---------- Forwarded message ----------
From: Nil Geisweiller <ngeiswei_at_[hidden]>
Date: Sun, Oct 25, 2009 at 6:11 PM
Subject: [Graph] problem with strong_components.hpp and variant
To: boost_at_[hidden]

Hi,

it seems there is a conflict between strong_components.hpp and
variant, maybe the method boost::get is wrongly overloaded.

The problem occurs with 1.40 but not with 1.37, and it is still occurs
with the last svn.

I attach a minimal code to reproduce the bug + compile error

######
test.cpp
######

//uncomment the line below to get the bug
#include <boost/graph/strong_components.hpp>
#include <boost/variant.hpp>

typedef boost::variant < int, float > intorfloat;

int main() {
 int i(2);
 intorfloat iof(i);
 return boost::get<int>(iof); //problem is here
}

###########
compile error
###########

a-lin_at_a-lin-desktop:~/OpenCog/test/bin$ make
[100%] Building CXX object CMakeFiles/test.dir/test.cpp.o
In file included from /usr/include/boost/graph/graph_concepts.hpp:17,
                from /usr/include/boost/graph/depth_first_search.hpp:18,
                from /usr/include/boost/graph/strong_components.hpp:17,
                from /home/a-lin/OpenCog/test/test.cpp:2:
/usr/include/boost/property_map/property_map.hpp: In instantiation of
‘boost::property_traits<int>’:
/usr/include/boost/graph/two_bit_color_map.hpp:46:   instantiated from
‘boost::two_bit_color_map<int>’
/home/a-lin/OpenCog/test/test.cpp:10:   instantiated from here
/usr/include/boost/property_map/property_map.hpp:31: error: ‘int’ is
not a class, struct, or union type
/usr/include/boost/property_map/property_map.hpp:32: error: ‘int’ is
not a class, struct, or union type
/usr/include/boost/property_map/property_map.hpp:33: error: ‘int’ is
not a class, struct, or union type
/usr/include/boost/property_map/property_map.hpp:34: error: ‘int’ is
not a class, struct, or union type
make[2]: *** [CMakeFiles/test.dir/test.cpp.o] Error 1
make[1]: *** [CMakeFiles/test.dir/all] Error 2
make: *** [all] Error 2

Is it a bug? Thanks a lot!
Nil