Re: [boost] asio forcing the use of handlers?

From: Christopher Kohlhoff (chris_at_[hidden])
Date: 2007-08-22 07:43:45

Roland Schwarz wrote:
> I am just about to find out how I could make use of the asio library, 
> and am wondering if async io also can be done without using handler 
> functions.
> 
> I recognize that it is possible to use it in a blocked manner as follows:
> 
> assuming we have an open socket: sock
> 
> read(sock, buf);
> ... use the buffer contents ...
> 
> Now I am wondering if I could also accomplish something like:
> 
> cp = async_read(sock, buf);
> ... do something useful ...
> cp.wait();
> .. use the buffer contents ...

Since handlers are just function objects you can use them to do pretty 
much anything, such as signalling your "cp" variable that the operation 
has completed. For example, see the sample code at the bottom of this 
posting:

http://article.gmane.org/gmane.comp.lib.boost.devel/155402

Cheers,
Chris