later.cc

// credit to http://stackoverflow.com/a/14665230/339222
 
#include <functional>
#include <chrono>
#include <future>
#include <iostream>
 
class later
{
public:
    template <class callable, class... arguments>
    later(int after, bool async, callable&& f, arguments&&... args)
    {
        std::function<typename std::result_of<callable(arguments...)>::type()> 
            task(std::bind(std::forward<callable>(f), 
                 std::forward<arguments>(args)...));
 
        if (async) {
            std::thread([after, task]() {
                std::this_thread::sleep_for(
                    std::chrono::milliseconds(after)
                );
                task();
            }).detach();
        } else {
            std::this_thread::sleep_for(
                std::chrono::milliseconds(after)
            );
            task();
        }
    }
};
 
void test1(void)
{
    return;
}
 
void test2(int a)
{
    std::cout << a << std::endl;
    return;
}
 
int main()
{
    later later_test1(1000, false, &test1);
    later later_test2(1000, false, &test2, 101);
    later later_test3(1000, false, [](int a, int b) -> void { 
        std::cout << (a + b) << std::endl; }, 3, 4);
 
    return 0;
}