[Rcpp-devel] assert() for Rcpp?

[JJ Allaire]

We *can* call Rf_error from C++ code, but when we do it bypasses all
C++ destructors on the stack, so we don't do it so as not leak memory
and otherwise have deterministic behavior around
construction/destruction.

You'll notice in Dirk's example that there are no C++ objects on the
stack when he calls Rf_error. The core idea in Rcpp is to use
exceptions to get high enough in the stack that there are no more
destructors.

On Wed, Feb 18, 2015 at 9:08 AM, Sparapani, Rodney <rsparapa at mcw.edu> wrote:
> On Tue, 2015-02-17 at 17:53 -0700, JJ Allaire wrote:
>> One piece of immediate feedback on your initial implementation: you
>> can't call Rf_error from C++ code (as it will bypass C++ destructors
>> on the stack). Rather, you should throw Rcpp::exception.
>
> Hi JJ:
>
> Ok, this puzzles me.  We can't call Rf_error from C++ code, but we can
> call it from within the exception handler, right?  It would seem so
> since Dirk has written a nice gallery post that does it that way...
> http://gallery.rcpp.org/articles/intro-to-exceptions
>
> Just my $0.02, but I would stick to exceptions and avoid assert in C++.
>
> Rodney
>
>
>
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