Threads

#include <thread>

The std::thread object takes a function pointer¹ as argument in its constructor.
As soon as the thread object is created, it is executed.

void hi () {
    std::cout << "hi" << std::endl;
}

int main () {
    std::thread thread_1(hi);  //hi() is immediately fired off
}

References

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1. Read more about function pointers. ↩