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From: Christopher Kohlhoff (chris_at_[hidden])
Date: 2005-12-12 16:17:00

Hi Felipe,

--- Felipe Magno de Almeida <felipe.m.almeida_at_[hidden]> wrote:

> I think that one possible solution would be that error checks
> would be than by the asio, and redirect it to another function
> if an error is found. That way could be binded two functions.
> It even seems to be possible to create auxiliary classes that
> does this things on top of the current asio library. It would
> even make the code a lot clearer, comparing to both .NET and
> current asio usage.

This could be done by composing a new function object to be
passed as the handler, e.g.:

  async_read(s, buffers,
    combine_handlers(handler1, handler2));

Boost.Lambda may also be of some use here.

However I am not convinced that this approach would be widely
applicable. There are many cases in networking where an error
for an individual operation is not an error for the application.

I also see the current "exactly-once" semantics of invoking
handlers as important in aiding correct program design, so I'd
be wary of using anything that changed that.


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