On exceptions in D

[Andrei Alexandrescu]

On 2/11/14, 9:02 AM, Dmitry Olshansky wrote:
> I'm thinking that I probably should compile this discussion to some
> implementable enhancement request for Phobos.
>
> `cachedException` or some such sounds like something suitable for
> std.exception.
>
> Thoughts?

We need the following:

* a "bool caught" state in Throwable. Whenever the Throwable is thrown, 
that is set to false. After the Throwable has been caught (including as 
part of a larger chain), the runtime sets the flag to true.

* a recycleException!E(Args...) factory function that keeps a cache of 
exceptions of type E. If an exception has been caught, it is considered 
recyclable and returned. If no caught exception is available, a new one 
gets created.


Andrei