Question

I want to learn how to create multiple threads with the new C++ standard library and store their handles into an array.
How can I start a thread?
The examples that I saw start a thread with the constructor, but if I use array, I cannot call the constructor.

#include <iostream>
#include <thread>

void exec(int n){
    std::cout << "thread " << n << std::endl;
}

int main(int argc, char* argv[]){

    std::thread myThreads[4];

    for (int i=0; i<4; i++){
        //myThreads[i].start(exec, i); //?? create, start, run
        //new (&myThreads[i]) std::thread(exec, i); //I tried it and it seems to work, but it looks like a bad design or an anti-pattern.
    }
    for (int i=0; i<4; i++){
        myThreads[i].join();
    }

}

Answer 1

Nothing fancy required; just use assignment. Inside your loop, write

myThreads[i] = std::thread(exec, i);

and it should work.