c – 通用参考和本地课程

换句话说,我应该使用std :: forward< F>或std :: move在构造函数初始化列表中？

#include "tbb/task.h"
#include <iostream>
#include <future>

template<class F>
auto Async(F&& f) -> std::future<decltype(f())>
{
    typedef decltype(f()) result_type;

    struct Task : tbb::task
    {
        Task(F&& f) : f_(std::forward<F>(f)) {} // is forward correct here?

        virtual tbb::task* execute()
        {
            f_();
            return nullptr;
        }

        std::packaged_task<result_type()> f_;
    };

    auto task = new (tbb::task::allocate_root()) Task(std::forward<F>(f));
    tbb::task::enqueue(*task);
    return task->f_.get_future();
}


int main()
{
    Async([]{ std::cout << "Hi" << std::endl; }).get();
}

Live demo.