Hi - Using Boost 1.53.0, the following code fails to compile with g++, when c++11 is enabled: #include <boost/python.hpp> #include <boost/variant.hpp> struct A{}; struct B{}; typedef boost::variant<A, B> my_variant; void foo(boost::python::object o) { my_variant v = boost::python::extract<my_variant>(o); } The error is: /home/bcatanzaro/boost_1_53_0/boost/variant/variant.hpp:1574:9: error: no matching function for call to ‘boost::variant<A, B>::initializer::initialize(void*, std::remove_reference<boost::python::extract<boost::variant<A, B>
&>::type)’
Looking at the relevant line in boost/variant/variant.hpp, it looks like variant is attempting to convert the boost::python::extract<my_variant> object into either A or B, and failing to find a conversion. Since this code compiles when c++11 is not enabled, it appears rvalue references coupled with boost::python::extract are confusing boost::variant's constructor selection; I would expect it should be copy constructing from the same variant, rather than convert constructing. Any advice or workarounds? Turning off c++11 is difficult, since the whole project relies on it. The code compiles correctly with c++11 turned on with Boost 1.48.0, so it appears something has regressed. Thanks, bryan