Re: [boost] C++ function bind

Subject: Re: [boost] C++ function bind
From: Sebastian Redl (sebastian.redl_at_[hidden])
Date: 2009-04-19 12:38:30

claud.86_at_[hidden] wrote:
> Hi to all, i use libboost recently, it is the ideal solution for my software
> c++. Now I'm using asio and I need to invoke a function like this:
>
> fun(time_from_string("2010-01-30 5:03:02"),bind(&timer::run,this));
>
> The body of fun will look like this:
>
> void fun(ptime t,void h) {
> ...
> timer.async_wait(h);
> ...
> }
>
> Obviously the return of the type of bind is not void and that is why there
> is an error. What kind should be the h parameter? Which is the prototype of
> fun?
>   
Usage questions about boost should go to the boost-help mailing list.

You need to make fun a template over the function parameter. The return
type can be derived using Boost's result_of protocol. I'm not 100% sure
about the details, but it should be something like

template <typename Fn>
typename boost::result_of<Fn>::type run_at(ptime at, Fn fn);

Sebastian