c++11 compliance: : Missing async()

[Dave Abrahams]

The lack of an async() call makes futures awfully cumbersome to use. I hacked up this nullary prototype for C++03. It's better than nothing!

#include <boost/thread.hpp>
#include <boost/utility/result_of.hpp>

template <class F>
boost::detail::thread_move_t<boost::unique_future<typename boost::result_of<F()>::type> >
async(F f)
{
    typedef typename boost::result_of<F()>::type R;
    boost::packaged_task<R> pt( f );
    
    typedef boost::unique_future<R> future;
    future ret = pt.get_future();
    boost::thread( boost::move(pt) ).detach();
    return boost::move(ret);
}

[viboes]

Add

template <class F, class... Args>
  future<typename result_of<F(Args...)>::type>
  async(F&& f, Args&&... args);
template <class F, class... Args>
  future<typename result_of<F(Args...)>::type>
  async(launch policy, F&& f, Args&&... args);

to conform with c++11.

[viboes]

Replying to viboes:

Add

template <class F, class... Args>
  future<typename result_of<F(Args...)>::type>
  async(F&& f, Args&&... args);
template <class F, class... Args>
  future<typename result_of<F(Args...)>::type>
  async(launch policy, F&& f, Args&&... args);

to conform with c++11.

I will implement these prototypes later on.

For the time been, the minimal request has benn done.

[viboes]

Merged from trunk [80450].