I want to make a callback that also calls back. I cannot get the code to compile. I read on the boost documentation about apply()., but the example is unclear and I am not sure if that is what I am looking for. /// Smart Pointer typedef boost::shared_ptr<TcpServerSideConnection> SmartPtr; /// Callback function pointer type for TcpListener notification that our execution of /// TcpServerSideConnection::OnConnectionAccepted has completed typedef boost::function ConnectionAcceptedListenerCallback; /// Callback function pointer type for TcpServerSideConnection notification of /// a TcpListener::Listen IO completion typedef boost::function ConnectionAcceptedCallback; TcpListener::SmartPtr me = boost::dynamic_pointer_cast(shared_from_this()); TcpServerSideConnection::ConnectionAcceptedListenerCallback listenerCallback = boost::bind(&TcpListener::OnConnectionAccepted, me, _1, _2); TcpServerSideConnection::ConnectionAcceptedCallback acceptCompleteCallback = boost::bind(&TcpServerSideConnection::OnConnectionAccepted, newConnection, listenerCallback, boost::asio::placeholders::error); acceptor_.async_accept(newConnection->GetSocket(), acceptCompleteCallback); Gives me a compile error in bind.hpp with 100s of pages. What am I doing wrong here? Does anyone have an example of a callback that callsback using boost::bind?