Plan for Exceptions and @nogc?
Dicebot via Digitalmars-d
digitalmars-d at puremagic.com
Wed Feb 18 06:46:28 PST 2015
On Monday, 16 February 2015 at 23:17:03 UTC, Jonathan Marler
wrote:
> Is there a proposal for how D will support throwing Exceptions
> in @nogc code in the future? I've searched the forums and
> found different proposals that involve things like
> pre-allocated exceptions, non-gc heap allocated exceptions or
> even stack allocated exceptions. I don't want to debate the
> details of each solution, I'd just like to know if any of these
> proposals are deemed a "good idea", or if any of them are
> currently being worked on. I personally think that using
> non-gc heap allocated exceptions in combination with the new
> scope semantics would be a great solution in many cases, but I
> don't know if there is any consensus or if this topic is just
> on the back-burner. Thanks.
From my POV best proposal from last lengthy discussion was to
enable reference-counted non-gc-heap Exceptions. But that needs a
language change because RefCounted!T is a struct and thus neither
can be thrown nor can be part of Throwable class hierarchy.
Any concept that implies that exceptions an be deallocated in
`catch` block is absolutely unacceptable because it conflicts
with exception propagation from fibers - a very important piece
of functionality.
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