www.pudn.com > ThreadLibrary.zip > Event.h

/** 
 *	@file 
 */ 
#pragma once 
#include  
#include  
#include  
 
/**  
 *	Provides an abstract base class for windows signal events 
 *  Event class objects should create override the constuctor, setting a valid handle 
 *  value for the base class.  The base class provides will close the handle on desruction 
 *  @note Do not close the handle in the derived classes. 
 */ 
class Event 
{ 
public: 
	/**	 
	 *	Initializes the handle to nothing 
	 */ 
	Event() : handle(NULL) 
	{ 
	}; 
	 
	/** 
	 *	Closes the event handle 
	 */ 
	virtual ~Event() 
	{ 
		if(handle)						// Just in case somebody DOES close the handle in the derived class 
			::CloseHandle(handle); 
	} 
	 
	/** 
	 *	Signals an event. 
	 *	Must be overridden in derived classes. 
	 */ 
	virtual void signal() = 0; 
 
	/**  
	 *	Allows events to be treated as native WIN32 objects. 
	 */ 
	operator void*() const 
	{ 
		return handle; 
	} 
 
protected: 
	void *handle; 
}; 
 
/** 
 *	EventException thrown when there are problems creating events. 
 * 
 *	@author Peter Hancock 
 */ 
class EventException : public std::exception 
{ 
public: 
	/** 
	 *	Creates an exception with a message. 
	 *	@param mesg	Message to pass back with the exception. 
	 */ 
	EventException(const char* mesg) : std::exception(mesg) 
	{ 
	} 
};