vmime/examples/example6_timeoutHandler.hpp

#include <ctime>


/** Time out handler.
  * Used to stop the current operation after too much time, or if the user
  * requested cancellation.
  */
class timeoutHandler : public vmime::net::timeoutHandler {

public:

	timeoutHandler()
		: m_start(time(NULL)) {

	}

	bool isTimeOut() {

		// This is a cancellation point: return true if you want to cancel
		// the current operation. If you return true, handleTimeOut() will
		// be called just after this, and before actually cancelling the
		// operation

		// 10 seconds timeout
		return (time(NULL) - m_start) >= 10;  // seconds
	}

	void resetTimeOut() {

		// Called at the beginning of an operation (eg. connecting,
		// a read() or a write() on a socket...)
		m_start = time(NULL);
	}

	bool handleTimeOut() {

		// If isTimeOut() returned true, this function will be called. This
		// allows you to interact with the user, ie. display a prompt to
		// know whether he wants to cancel the operation.

		// If you return false here, the operation will be actually cancelled.
		// If true, the time out is reset and the operation continues.
		return false;
	}

private:

	time_t m_start;
};


class timeoutHandlerFactory : public vmime::net::timeoutHandlerFactory {

public:

	vmime::shared_ptr <vmime::net::timeoutHandler> create() {

		return vmime::make_shared <timeoutHandler>();
	}
};