Tech Sujhav : How to call static function, member function by reference, value and pointer in thread.

It is very simple to call a member function or static member function from thread following is the example the shall help us.

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

include <iostream>
#include <thread>
#include <string>
using namespace std;

class Suggest
{
   string m_name;
public:
   Suggest()
   {
       m_name="Tech";
   }
   void updateName(string str)
   {
       m_name=str;
   }
   void displayName()
   {
       cout<<"Name "<<m_name<<endl;
   }
   static void display(string str)
   {
       cout<<"Static Function Call :: "<<str<<endl;
   }
};
int main()
{
   //Call static function both ways are correct
   std::thread objThd(Suggest::display,"without &");
   objThd.join();

   std::thread objThd1(&Suggest::display,"with &");
   objThd1.join();

   cout<<endl<<"Call Member Function "<<endl;
   //call thread by object for member function,
   //object is passed by value
   Suggest sObj;
   cout<<"Object PASSED-BY-VALUE "<<endl;
   sObj.displayName();

   std::thread objThrd(&Suggest::updateName,sObj,"Value - Suggestion");
   objThrd.join();
   sObj.displayName();

   //object is passed by reference
   cout<<endl<<"Object PASSED-BY-REFERENCE "<<endl;
   Suggest sObjNew;
   sObjNew.displayName();

   std::thread objThrd1(&Suggest::updateName,&sObjNew,"Reference - Suggestion");
   objThrd1.join();
   sObjNew.displayName();

   //object is passed by pointer
   cout<<endl<<"Object PASSED-BY-POINTER "<<endl;
   Suggest* ptrObj=new Suggest;
   ptrObj->displayName();

   std::thread objThrd2(&Suggest::updateName,ptrObj,"Pointer - Suggestion");
   objThrd2.join();
   ptrObj->displayName();

   return 0;
}

Compile: g++ classFunctions.cpp -o classFunctions -lpthread

Output: $ ./classFunctions

Static Function Call :: without &
Static Function Call :: with &

Call Member Function

Object PASSED-BY-VALUE

Name Tech
Name Tech

Object PASSED-BY-REFERENCE

Name Tech
Name Reference - Suggestion

Object PASSED-BY-POINTER

Name Tech
Name Pointer - Suggestion

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