Accessing Class Members From the Static Member Function

When a class has Thread entry functions, it is usually declared as static member functions of the class as in the example below:

 Class A{private:	int i,j,k;public:	//Thread Entry function	static DWORD WINAPI ThreadFunc(PVOID p);	//other functions	void SomeFunc();}

The implementation of the function does not allow access to the class members since this is a static function. One solution is to pass the class object itself as a parameter of the thread function and access the class members through the pointer passed.

The thread may be created from SomeFunc()

 void SomeFunc(){	...	...	CreateThread (NULL, 1024, A::ThreadFunc, this, CREATE_SUSPENDED, &_tid);	...	...}DWORD A::ThreadFunc(VOID * p){	A * pA = (A *)p;	//access members thru pA	pA->i = pA->j + pA->k;	return 0;}

This approach is difficult since the object has to be de-referenced every time especially if the object is being used heavily inside the function. An easier way is to add a member function DWORD DoThreadFunc() to the class. From the original ThreadFunc, make a call to DoThreadFunc and do all the processing in DoThreadFunc as shown below.

 DWORD A::ThreadFunc(VOID * p){	return pA->DoThreadFunc();}DWORD A::DoThreadFunc(){   i = j+k;   return 0;}

From DoThreadFunc(), we can access the class members directly. This will make the code look more readable without unwanted ->s

Share the Post:
Share on facebook
Share on twitter
Share on linkedin


The Latest

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may