Re: [asio-users] asio streambuf

[Christopher K. <ch...@ko...>]

On Sat, 23 Jun 2007 20:35:49 +0300, "Igor Solovyov"
<igo...@gm...> said:
> Whether is it possible after reading by >> to return all read data back 
> into buffer (some kind of rollback functionality)?

No. It behaves like other streambuf classes in the standard, in that
once the data is consumed it is gone.

> Also, my wishes relative to async_read_until.
> I found this method very useful with regexp, but it would be great if
> such approach is more generalized.
> What about passing some kind of functors which should return true if some
> necessary data portion (i.e. network message) is got completely?
> I try to illustrate my thought by following example:
> 
> async_read_until( myStream, myStreambuf, myFunctor, myReadHandler);
> 
> where myFunctor has type
> struct MyFuctor
> {
>   template< typename TIterator >
>   bool operator()( TIterator begin, TIterator end )
>   {
>      if ( end - begin < 33 )
>        return false;     
>      // ... parsing the protocol message ...
>      return true;
>   }
> };

Yes, I plan to do add something like this in the future. However, I am
not happy with a function object interface that requires the function to
be a template. I am yet to come up with an interface that I like.

Cheers,
Chris