Re: [boost] Exception Visitor and system_error

From: Jeremy Day (jeremy.day_at_[hidden])
Date: 2006-07-19 08:26:46

Oleg,

I strongly suspect that it was your [system] message that got me thinking of
this in the first place.  I'll try to get the code polished up a bit more
and put into the vault later today.

Jeremy

On 7/18/06, Oleg Abrosimov <beholder_at_[hidden]> wrote:
>
> Hello Jeremy!
>
> You've come in the right place and in the right time.
> Your code is _very_ useful and is a great step forward in exception
> handling techniques. See my previous post with [system] in it's subject.
>
> after posting it I've thought further and caught the idea to use visitor
> pattern to handle exceptions in type-safe, re-usable and manageable way.
> but I've had no idea of how to implement it in current C++. So your code
> is very welcomed. put it in the vault section (you can find it on the
> main boost page) please.
>
> in filesystem error handling it can be used uniformly to handle errors
> in both cases where exception or additional parameter to indicate error
> is used:
>
> class my_exception_handler {...};
>
> try {
>    call_filesystem_lib(...);
> } catch(...) {
>    catcher(my_exception_handler());
> }
>
> or
>
> call_filesystem_lib(..., my_exception_handler());
> //Note no error code is required
>
>
> Best,
> Oleg Abrosimov.
>
> Jeremy Day wrote:
> > On 7/18/06, Sohail Somani <s.somani_at_[hidden]> wrote:
> >> I just don't see the point, except as an academic exercise
> >
> >
> > The point is partly academic, as I am working on learning MPL.  However,
> I
> > think that this technique, or some derivation thereof, can help make
> code
> > more maintainable, since you can reuse my_exception_handler whenever you
> > want to handle the same exception in the same way, even though you catch
> it
> > in a different place.  With catch blocks the only recourse, so far as I
> can
> > tell, is to basically copy-and-paste the catch code to each location
> where
> > you need the exception handling code.
> >
> > Jeremy
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