On Friday, 28 August 2015 at 06:19:55 UTC, Jacob Carlborg wrote:
Is it possible to detect at compile time if an interface is not
a native D interface?
Not fully, no, but you might be able to reflect into the methods
and see what kind of linkage they have.
http://dlang.org/phobos/std_traits.html#functionLinkage
The interface itself won't necessarily be marked extern - on the
binary level, they are all the same (I think... just a pointer to
a list of function pointers), but if you look at the methods you
can make a reasonably good guess.
However, you can't do anything with an interface that isn't in
there anyway without a runtime cast, so you might want to just
skip any compile time guesses and just go with the runtime check.
Now when I think about it, we actually have four (!) different
kinds of interfaces. Native D, C++, Objective-C and COM.
aye, and since the interface is so simple at the binary level, it
is possible to use them for other things too (I think a glib
object in C is also binary compatible...); I'm sure this won't be
the end of the list.
