Hi there, I have a problem compiling the following code with g++ 2.95.3 and boost 1.28.0. ---%<--- #include <boost/bind.hpp> #include <boost/function/function0.hpp> struct A { A(boost::function0<void> const &) { } }; void foo(boost::function0<void> const &) {} void bar(unsigned int) {} int main(int argc, char *argv[]) { boost::bind(foo, boost::bind(bar, 0)); // ok A a1(boost::bind(bar, 0)); // ok A a2(boost::bind(foo, boost::bind(bar, 0))); // error return 0; } --->%--- The line marked with error gives me a whole flood of error messages. Is this a problem with my version of gcc? Or am I doing a stupid mistake? TIA, Markus PS: Here are the errors I get: /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp: In method `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::function0<void>(void)': /opt/ginit/lib/boost-1.28.0/boost/bind.hpp:163: instantiated from `boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > >::operator ()<void, void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &), boost::_bi::list0>(boost::_bi::type<void>, void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &), boost::_bi::list0 &) const' /opt/ginit/lib/boost-1.28.0/boost/bind/bind_template.hpp:21: instantiated from `boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >::operator ()()' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:127: instantiated from `boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >,void>::invoke(boost::detail::function::any_pointer)' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:437: instantiated from `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::assign_to<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > > >(boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >, boost::detail::function::function_obj_tag)' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:388: instantiated from `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::assign_to<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > > >(boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >)' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:274: instantiated from `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::function0<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > > >(boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >)' test_bind.cpp:16: instantiated from here /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:271: parameter `f' declared void /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:274: `f' undeclared (first use this function) /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:274: (Each undeclared identifier is reported only once /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:274: for each function it appears in.) /opt/ginit/lib/boost-1.28.0/boost/bind.hpp: In method `void boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > >::operator ()<void, void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &), boost::_bi::list0>(boost::_bi::type<void>, void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &), boost::_bi::list0 &) const': /opt/ginit/lib/boost-1.28.0/boost/bind/bind_template.hpp:21: instantiated from `boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >::operator ()()' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:127: instantiated from `boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >,void>::invoke(boost::detail::function::any_pointer)' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:437: instantiated from `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::assign_to<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > > >(boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >, boost::detail::function::function_obj_tag)' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:388: instantiated from `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::assign_to<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > > >(boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >)' /opt/ginit/lib/boost-1.28.0/boost/function/function_template.hpp:274: instantiated from `boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int>::function0<boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > > >(boost::_bi::bind_t<void,void (*)(const boost::function0<void,boost::empty_function_policy,boost::empty_function_mixin,int> &),boost::_bi::list1<boost::_bi::bind_t<void,void (*)(unsigned int),boost::_bi::list1<boost::_bi::value<int> > > > >)' test_bind.cpp:16: instantiated from here /opt/ginit/lib/boost-1.28.0/boost/bind.hpp:163: Internal compiler error in `emit_move_insn_1', at expr.c:2829 Please submit a full bug report. See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.