[Haskell-cafe] C++ exception (from *.so) catchable by Haskell??

[Nick Rudnick]

thank you :-) in regard of (1), I am still fiddling to get it running; as
Brandon did foresee, there seem difficulties here. Do have any piece of FFI
code in mind which makes use of this?

With respect to (2) – if one has a rather fine grained interface to rather
atomic actions, remains the overhead still OK at lots of function calls? I
read overhead should be quite low, but does it apply for FFI usage?

Cheers, Nick


2014-02-13 13:11 GMT+01:00 Alexander Kjeldaas <alexander.kjeldaas at gmail.com>
:

>
> Two approaches:
>
> 1. Use set_unexpected.
> http://www.cplusplus.com/reference/exception/set_unexpected/
>
> 2. Wrap your FFI code in try/catch.
>
> Alexander
>
>
> On Thu, Feb 13, 2014 at 12:43 PM, Nick Rudnick <nick.rudnick at gmail.com>wrote:
>
>> Dear all,
>>
>> after trying around a while this seems to be a good question for
>> Haskell-cafe to me: Is somewhere a place (e.g. some Hackage package) where
>> intercepting exceptions from C++ library code is done, so one can look
>> *how* it is done?
>>
>> Generally, it is the following:
>> 1) Injecting code that throws a an exception in C++ library code, e.g.,
>>
>> throw runtime_error("OOOPS...");
>>
>>
>> 2) then, I tried out everything in reach (Haskell docs, Hackage
>> interfaces to C++ considered to be well-done) to get it caught (try, catch,
>> bracket, finally; various exception types; forkOS).
>>
>> 3) To my surprise, every time the output stays the same:
>>
>> terminate called after throwing an instance of 'std::runtime_error'
>>   what():  OOOPS...
>>
>> Is it possible at all to get a grip of this? Is there some place where it
>> is done? Does the terminate call already happen with the C++ execution?
>>
>> Any comment welcome, cheers, Nick
>>
>> _______________________________________________
>> Haskell-Cafe mailing list
>> Haskell-Cafe at haskell.org
>> http://www.haskell.org/mailman/listinfo/haskell-cafe
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20140213/475757e4/attachment.html>