Hi Kevin
Thanks for your answer. I've tried declaring them as inline but the
compiler (clang, haven't tried gcc) issues a warning saying it's going
to ignore the inline statement. I'm assuming this is because the
declaration is actually a template specialisation but I haven't found a
definitive answer.
If I separate the declaration from the definition, the linker now
complains as and wrap are missing. Using the interface:: attribute
doesn't seem to help either.
Best
Simon
Le 17/07/2015 16:56, Kevin Thornton a écrit :
A good guess is that the as/wrap definitions in wrappers.h are the
culprit
(https://github.com/dahtah/imager/blob/master/inst/include/wrappers.h). Try
declaring them as inline, or separating the definition from the
declaration.
—Kevin
On Jul 17, 2015, at 7:32 AM, Simon Barthelmé
<simon.barthe...@gipsa-lab.fr <mailto:simon.barthe...@gipsa-lab.fr>>
wrote:
Dear list,
For a package I'm developing (https://github.com/dahtah/imager/) I
had to write custom "as" and "wrap" functions for third-party
classes. I'd like to make these wrappers accessible to other
developers via inline C++ as well as LinkingTo directives (so that
they can be used in other packages).
So far I've only managed the former: I have a header file in
inst/include, called "wrappers.h", that contains the full
implementations of my custom as and wrap functions. I've written a
custom inline plugin and everything works fine. However, LinkingTo
doesn't work: wrappers.h gets included in multiple object files and I
get linking errors (the linker complains about multiple declarations
of "as" and "wrap").
I understand RcppArmadillo manages to get around the problem but I
can't figure out how. What's the correct way of doing this? Is there
a way of making as and wrap inline functions so that it's safe to
have header-only implementations?
Thanks!
Simon Barthelme
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