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I am learning boost::asio and C++11 simultaneously. One of my test programs, which is actually an adaptation of one of the samples given in the boost::asio tutorial is the following: #include <iostream> #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> class printer { // Static data members private: const static boost::posix_time::seconds one_second; // Instance data members private: boost::asio::deadline_timer timer; int count; // Public members public: printer(boost::asio::io_service& io) : timer(io, one_second), count(0) { std::function<void(const boost::system::error_code&)> callback; callback = [&](const boost::system::error_code&) { // critical line if (count < 5) { std::cout << "Current count is " << count++ << std::endl; timer.expires_at(timer.expires_at() + one_second); timer.async_wait(callback); } }; timer.async_wait(callback); } ~printer() { std::cout << "Final count is " << count << std::endl; } }; const boost::posix_time::seconds printer::one_second(1); int main() { boost::asio::io_service io; printer p(io); io.run(); return 0; } When I run this program, I get a segmentation fault. I do understand why I get the segmentation fault. After the constructor is done running, the constructor's callback variable goes out of scope, and the lambda's callback variable, which is a reference to the constructor's callback variable, becomes a dangling reference. So I modify the critical line with: callback = [callback, &](const boost::system::error_code&) { // critical line <

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