event.h

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/*
 Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.4 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#ifndef TC_HEADER_Platform_Event
#define TC_HEADER_Platform_Event

#include "PlatformBase.h"
#include "ForEach.h"
#include "Mutex.h"
#include "SharedPtr.h"

namespace TrueCrypt
{
	struct EventArgs
	{
		virtual ~EventArgs () { }
	};

	class EventConnectorBase
	{
	public:
		virtual ~EventConnectorBase () { }
		virtual void operator() (EventArgs &args) = 0;

		virtual EventConnectorBase *CloneNew () const = 0;
		virtual void *GetHandler () const = 0;
	};

	typedef list < shared_ptr <EventConnectorBase> > EventHandlerList;

	template <class T>
	class EventConnector : public EventConnectorBase
	{
	public:
		typedef void (T::*EventHandlerFunction) (EventArgs &);

		EventConnector (T *handler, EventHandlerFunction function)
			: Handler (handler), Function (function) { }

		virtual void operator() (EventArgs &args) { (Handler->*Function) (args); }

		virtual EventConnectorBase *CloneNew () const { return new EventConnector <T> (*this); }
		virtual void *GetHandler () const { return Handler; }

	protected:
		T *Handler;
		EventHandlerFunction Function;
	};

	class Event
	{
	public:
		Event () { }
		virtual ~Event () { }

		void Connect (const EventConnectorBase &connector);
		void Disconnect (void *handler);
		void Raise ();
		void Raise (EventArgs &args);

	protected:
		EventHandlerList ConnectedHandlers;
		Mutex HandlersMutex;

	private:
		Event (const Event &);
		Event &operator= (const Event &);
	};

	struct ExceptionEventArgs : EventArgs
	{
		ExceptionEventArgs (exception &ex) : mException (ex) { }
		exception &mException;

	private:
		ExceptionEventArgs (const ExceptionEventArgs &);
		ExceptionEventArgs &operator= (const ExceptionEventArgs &);
	};
}

#endif // TC_HEADER_Platform_Event