[Boost-users] Re: boost::thread no parameter?

From: Michael Glassford (glassfordm_at_[hidden])
Date: 2004-03-11 10:24:09

"Beman Dawes" <bdawes_at_[hidden]> wrote in message
news:4.3.2.7.2.20040310204959.02bf1550_at_mailhost.esva.net...
> At 07:49 PM 3/10/2004, Howard Hinnant wrote:
>
>  >On Mar 10, 2004, at 6:27 PM, GoochRules! wrote:
>  >> I'm wondering why there is no option to pass a parameter to a
thread
>  >> function with boost's threads.  With pthreads and Windows
CreateThread
>  >> I'm used to casting an object to a void*, and retrieving the
object
>  >> within the thread function.  The only thing similar with
boost::thread
>  >> seems to be to create a struct with an operator()() and a
constructor
>  >> that takes a void*.  operator()() then calls an external
function with
>  >> the passed void*.
>  >>
>  >> Just curious about this design decision.
>  >
>  >I would guess because it is so easy (at least with the right
tools!) to
>  >create function objects that adapt a function from one that takes
>  >parameters to one that doesn't.
>  >
>  >void foo(int, double);
>  >void bar(A*);
>  >
>  >struct A{};
>  >
>  >int main()
>  >{
>  >     thread t1(bind(foo, 1, 2.5));
>  >     thread t2(bind(bar, new A));
>  >}
>
> Seems like thread/doc/thread.html should give an example similar to
the
> above. Maybe modified with a join() and changed so it doesn't
leak:-)

I'll try to work on this soon.

> --Beman