The flag of the Private member variable of the category class in the thread. No error is reported. It is a surprise. solve it!

 

// Testflag11.cpp: defines the entry point of the console application.
//

# Include "stdafx. H"

# Include "windows. H"

# Include "process. H"

Class exampletask
{
Public:
Exampletask (void)
{
Flag = true;
}
Static void taskmain (lpvoid PARAM );
Void starttask ();
Void setvalue (bool flag_1)
{
Flag = flag_1;
};

PRIVATE:
Bool flag;

};

Void exampletask: taskmain (lpvoid PARAM)
{
Exampletask * ptaskmain = (exampletask *) Param; // reference through the ptaskmain pointer
While (ptaskmain-> flag)
{
Printf ("Hello world \ n ");
Sleep (200 );
}

Printf ("thread exit \ n ");
Return;

}

Void exampletask: starttask ()
{
_ Beginthread (taskmain, 0, this );
}

Int main (INT argc, char * argv [])
{
Exampletask realtimetask;
Realtimetask. starttask ();

Sleep (3000 );
Realtimetask. setvalue (false );

Sleep (1000 );

Return 0;
}

 

Test results:

Private Members can be accessed in the same class!