Hi, Deriving from the boost::noncopyable class generates warnings when I compile with the -Weffc++ (effective C++) flags. There are two types of warnings: 1) Non-virtual destructor warning (base class 'class boost::noncopyable_::noncopyable' has a non-virtual destructor). Here's a testcase: #include <boost/noncopyable.hpp> #include <iostream> namespace { class DontTreadOnMe : private boost::noncopyable { public: DontTreadOnMe() { std::cout << "defanged!" << std::endl; } }; // DontTreadOnMe } // unnamed namespace main() { DontTreadOnMe object1; } g++ -I/vobs/3rdparty/BOOST/boost_1_38_0/boost_inc -Weffc++ main.cpp main.cpp:10: warning: base class 'class boost::noncopyable_::noncopyable' has a non-virtual destructor 2) I have disabled the copy constructor/assignment operator in a class that has pointer data members by deriving from boost::noncopyable. However, the compiler generates the following warning: warning: 'class<unnamed>::DontTreadOnMe' has pointer data members main.cpp:10: warning: but does not override '<unnamed>::DontTreadOnMe(const <unnamed>::DontTreadOnMe&)' This kind of forces me to explicitly override the copy constructor and assignment operator instead of deriving from noncopyable. Here's the full test case: #include <boost/noncopyable.hpp> #include <iostream> namespace { class DontTreadOnMe : private boost::noncopyable { public: DontTreadOnMe() { std::cout << "defanged!" << std::endl; } private: char* buf; }; // DontTreadOnMe } // unnamed namespace main() { DontTreadOnMe object1; } g++ -I/vobs/3rdparty/BOOST/boost_1_38_0/boost_inc -Weffc++ main.cpp main.cpp:10: warning: base class 'class boost::noncopyable_::noncopyable' has a non-virtual destructor main.cpp:10: warning: 'class<unnamed>::DontTreadOnMe' has pointer data members main.cpp:10: warning: but does not override '<unnamed>::DontTreadOnMe(const <unnamed>::DontTreadOnMe&)' main.cpp:10: warning: or 'operator=(const <unnamed>::DontTreadOnMe&)' Is there a workaround and/or fix? I am using gcc 4.0.1. Thanks, Anand