Rethrow an exception like in C++?

[Rob T]

On Friday, 8 March 2013 at 18:49:53 UTC, Jonathan M Davis wrote:
> Except that the C++ one is just as pointless. In both cases, 
> you're telling it
> to catch everything. It's just that syntax is slightly 
> different, because D
> doesn't allow you to throw without an explicit variable. And 
> it's only a
> handful of characters difference in length. So, to some of us 
> at least, it
> seems like you're blowing things out of proportion. And given 
> the lack of
> clarity in the C++ solution, it comes off as being worse from a 
> technical
> perspective, regardless of the typing involved.
>
> - Jonathan M Davis

I don't wish to blow things out of proportion, and will say again 
that the main objective I was trying to achieve has been met, 
thanks to the assistance I received in here, so this remaining 
item is not all that major, it's just an unnecessary repetitive 
nuisance to me.

 From a technical stand point, I'm implementing a reusable 
exception handler or dispatcher (I've seen these two terms used 
to describe it) which is extremely useful to me, and I would 
assume to many others. There are examples of this concept 
implemented in C++ by other programmers, that's how I got the 
idea.

Before I started using an exception handler, my exception 
handling was very limited and tedious to implement, and I never 
saw a need to re-throw an exception. There may be other uses for 
rethrow that I'm not aware of.

What my C++ exception handler does not require, is the exception 
reference passed in as an argument, so that's one of the main 
differences between what D allows and what C++ allows. In my case 
every catch statement and function call will be identical, it's 
slightly more tedious to type in than the C++ version. No big 
deal for you, but it is annoying for me because I use this form 
very frequently.

If you know of a better way to implement an exception handler in 
D, then I'd like to know about it. For example I do know that D's 
system allows you to insert callback functions, but I don't yet 
know how to make use out of it, so  perhaps there's a better way.

Any further help or insight on this matter is appreciated.

--rt