How can I fix C++ error C2672 in my code with threads?

Question

When I'm trying to compile program with threads, C2672 error ('invoke': no matching overloaded function found) is occuring.

My code:

#include <iostream>
#include <thread>
// the procedure for array 2 filling
void bar(int sum2)
{
    for (int i = 100000; i < 200000; i++) {
        sum2 = sum2 + (i + 1);
        std::cout << sum2;
    }
}
int main()
{
    // the second counter initialization
    int sum2 = 0;
    // the constructor for the thread
    std::cout << "staring thread2...\n";
    std::thread thread(bar);
    // the thread detaching
    thread.detach();
    // the first counter initialization
    int sum1 = 0;
    // filling of the first array
    for (int i = 0; i < 100000; i++) {
        sum1 = sum1 + (i + 1);
        // elements output
        std::cout << sum1;
    }
}

Tell me please, how to fix this bug?

Answer 1

You need to pass a value to the thread you're creating,

std::thread thread(bar, N);

where N is the integer value, as you've defined in your void bar(int) function.

#include <iostream>
#include <thread>

// the procedure for array 2 filling
void bar(int sum2)
{
    for (int i = 100000; i < 200000; i++) {
        sum2 = sum2 + (i + 1);
        std::cout << sum2;
    }
}

int main()
{
    // the second counter initialization
    int sum2 = 0;
    // the constructor for the thread
    std::cout << "staring thread2...\n";
    std::thread thread(bar, 100);
    // the thread detaching
    thread.detach();
    // the first counter initialization
    int sum1 = 0;
    // filling of the first array
    for (int i = 0; i < 100000; i++) {
        sum1 = sum1 + (i + 1);
        // elements output
        std::cout << sum1;
    }
    return 0;
}