Hi, I don't seem to understand how to use mutable_queue correctly. The following crashes with *** glibc detected *** ./prior: free(): invalid next size (fast): 0x00000000006038e0 *** I guess that the third template parameter and/or the third constructor parameter cause the problem. #include typedef boost::mutable_queue Queue; int main() { boost::identity_property_map imap; std::greater<unsigned> comp; std::vector<unsigned> d; d.push_back(47); d.push_back(11); d.push_back(42); Queue q(d.begin(),d.end(),comp,imap); }