Best way to get return value from thread

Question

Hi

I have a function which returns a value. Does there a better way to return the value from thread compare to what I have here in below code?
https://sololearn.com/compiler-playground/cFn1Tvsfe4dm/?ref=app

Answer 1

have you tried async?

Answer 2

Yes , but not using async. Just a pure threading is the need
https://sololearn.com/compiler-playground/cz46C4OrVwep/?ref=app

Answer 3

//you can use ref

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

void getData(int& n){
n = 100;
}

int main() {

int retVal;

thread t(getData, ref(retVal));

t.join();

cout << retVal << endl;

}

Answer 4

Thats true but pass by ref is crude way. I will have to change the existing function signature also. Thanks 😊 but is there any other option?