[Rcpp-devel] Fwd: Exposed class works within cpp func, bombs via module

[Kevin Ushey]

Hi Thell,

Thanks for all the work you've done investigating this. Can you please
consolidate the information you have and post it as an issue here:
https://github.com/RcppCore/Rcpp/issues?state=open?

And, if you're willing to dive in and figure out what exactly is
happening, patches are much appreciated -- we will try to investigate
as well.

Thanks,
Kevin

On Fri, Feb 28, 2014 at 3:18 PM, Thell Fowler <tbfowler4 at gmail.com> wrote:
> On Wed, Feb 26, 2014 at 1:48 PM, Thell Fowler <tbfowler4 at gmail.com> wrote:
>> On Wed, Feb 26, 2014 at 12:56 PM, Thell Fowler <tbfowler4 at gmail.com> wrote:
>>> On Wed, Feb 26, 2014 at 12:33 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
>>>>
>>>> On 26 February 2014 at 12:26, Thell Fowler wrote:
>>>> | BTW - what was the fix/issue you tackled yesterday?  Possibly any relation?
>>>>
>>>> Unrelated, mostly, as it was a for loop with iterators using comparison
>>>> (wrongly) and arithmetic on the iterator object.  In that case using
>>>> old-school indices worked more reliably. Somewhat related in the sense that
>>>> unnecessary complexity was added by trying to be clever via iterators.
>>>>
>>>> Here we don't know. It could be something in our backend, or it could be your
>>>> code.
>>>>
>>>> Dirk
>>>>
>>>> --
>>>> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
>>>
>>>
>>> Good point regarding 'being clever' with the iterators.
>>>
>>> Here's a small reproducible sample of without _anything_ else going on...
>>>
>>> https://gist.github.com/Thell/9231866
>>>
>
> --->8---
>
>>
>> Narrowed down to invalidation of pointer because data (vec) is moved
>> _after_ the constructor exits.  Setting the iterator member after the
>> construction has completed looks to resolve the issue.
>>
>> So, construct, { init, use }...
>>
>> Is that change of address on purpose to facilitate the Rcpp/R bridge
>> or is it a side effect?
>>
>> --
>> Sincerely,
>> Thell
>
> I just wanted to report that if the std::vector<int> vectors are
> changed to IntegerVector vectors the addresses reported in BadIter do
> not change when the constructor completes.
>
> --
> Sincerely,
> Thell
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