Construction of callable objects

callable.cpp

#include <iostream>
#include <thread>
#include <list>

struct Object
{
    void method(int n) {}
    void operator()(int n) {}
};

void function(int n)
{
}

int main()
{
    Object obj;

    std::list<std::thread> threads;

    threads.emplace_back(obj, 7);
    threads.emplace_back(std::ref(obj), 7);
    threads.emplace_back(std::move(obj), 7);
    threads.emplace_back(Object(), 7);
    threads.emplace_back(&Object::method, obj, 7);
    threads.emplace_back(&Object::method, &obj, 7);
    threads.emplace_back([](int n){}, 7);
    threads.emplace_back(function, 7);

    for (auto& th : threads)
    {
        th.join();
    }
}