Removed unused/unimplemented function.

doc/book/basics.tex

@@ -806,8 +806,6 @@ of progress when they are performing an operation.
 The {\vcode vmime::utility::progressListener} interface is rather simple:
 
 \begin{lstlisting}
-const bool cancel() const;
-
 void start(const int predictedTotal);
 void progress(const int current, const int currentTotal);
 void stop(const int total);
@@ -818,8 +816,3 @@ of the operation, respectively. {\vcode progress()} is called each time the
 status of progress changes (eg. a chunk of data has been processed). There is
 no unit specified for the values passed in argument. It depends on the
 notifier: it can be bytes, percent, number of messages...
-
-Your listener can return {\vcode} in the {\vcode cancel()} method to cancel
-the operation. However, be warned that cancelling is not always supported by
-the source object.
-

src/vmime/net/pop3/POP3Response.cpp

@@ -254,12 +254,6 @@ void POP3Response::readResponseImpl
 
 	while (!is.eof())
 	{
-#if 0 // not supported
-		// Check for possible cancellation
-		if (progress && progress->cancel())
-			throw exceptions::operation_cancelled();
-#endif
-
 		// Check whether the time-out delay is elapsed
 		if (m_timeoutHandler && m_timeoutHandler->isTimeOut())
 		{

src/vmime/utility/progressListener.cpp

@@ -37,12 +37,6 @@ progressListenerSizeAdapter::progressListenerSizeAdapter
 }
 
 
-bool progressListenerSizeAdapter::cancel() const
-{
-	return (m_wrapped ? m_wrapped->cancel() : false);
-}
-
-
 void progressListenerSizeAdapter::start(const size_t predictedTotal)
 {
 	if (m_wrapped)

src/vmime/utility/progressListener.hpp

@@ -45,15 +45,6 @@ protected:
 
 public:
 
-	/** Allow the caller object to cancel the current operation.
-	  *
-	  * @warning WARNING: this is implementation-dependent: cancelling
-	  * may not be supported by the notifier object.
-	  *
-	  * @return true to cancel the operation, false otherwise
-	  */
-	virtual bool cancel() const = 0;
-
 	/** Called at the beginning of the operation.
 	  *
 	  * @param predictedTotal predicted amount of units (this has
@@ -92,8 +83,6 @@ public:
 	  */
 	progressListenerSizeAdapter(progressListener* list, const size_t total);
 
-	bool cancel() const;
-
 	void start(const size_t predictedTotal);
 	void progress(const size_t current, const size_t currentTotal);
 	void stop(const size_t total);