Tech Sujhav : How to call overridden virtual function from thread

To call correct overridden function we are supposed to pass correct pointer or reference object.

Note:- use & to pass reference variable.

For best understanding please COPY, PASTE and RUN in any online compiler.

#include<iostream>
#include <thread>
#include<string>
using namespace std;
class Base
{
   public:
       virtual void displayName(string name)
       {
           cout<<"Base :: "<<name<<endl;
       }
};
class Derived1: public Base
{
   public:
       void displayName(string name)
       {
           cout<<"Derived-1 :: "<<name<<endl;
       }
};
class Derived2: public Base
{
   public:
       void displayName(string name)
       {
           cout<<"Derived-2 :: "<<name<<endl;
       }
};
int main()
{
   //call overridden function using pointer
   Base* bPtr=nullptr; //NULL
   bPtr=new Derived1;

   std::thread objThrd(&Base::displayName,bPtr,"techSujhav.com");
   objThrd.join();
   delete bPtr;

   bPtr=new Derived2;

   std::thread objThrd1(&Base::displayName,bPtr,"techSujhav.com");
   objThrd1.join();
   delete bPtr;

   bPtr=new Base;

   std::thread objThrd2(&Base::displayName,bPtr,"techSujhav.com");
   objThrd2.join();
   delete bPtr;

   //call overridden function using refernece object
   Derived1 d1_Obj;
   Base& refBaseObj=d1_Obj;
   std::thread objThrd3(&Base::displayName,&refBaseObj,"refBaseObj :: techSujhav.com");
   objThrd3.join();

   return 0;
}

$ g++ overRide.cpp -o overRide –lpthread

$ ./overRide

Derived-1 :: techSujhav.com

Derived-2 :: techSujhav.com

Base :: techSujhav.com

Derived-1 :: refBaseObj :: techSujhav.com

PREV::How to call static function, member function by reference,

value and pointer in thread.

Main Page

How to call overloaded member function from thread::NEXT

Your Comments /Suggestions & Questions are always welcome.

We would like to help you with best of our knowledge.