What processes occur internally during the initialization of a std::thread object in C++?

When initializing a std::thread object in C++, the following happens:

1. A new execution thread is created, which starts working with the specified function or callable object.
2. In the std::thread constructor, copying or moving the callable object and its arguments occurs.
3. The system thread associated with the std::thread object is started.
4. The std::thread object becomes the owner of this thread, providing methods to wait for completion (join), detach (detach), and check status.

Example:

#include <thread>
#include <iostream>

void func(int x) {
    std::cout << "Thread function with value: " << x << std::endl;
}

int main() {
    std::thread t(func, 5); // thread is created and started
    t.join(); // wait for completion
    return 0;
}

Thus, std::thread encapsulates the system thread and manages its lifecycle.