Hi,
On Wed, 2009-02-11 at 16:29 -0600, Patrick Hartling wrote:
> Marcus Lindblom wrote:
> > Patrick Hartling wrote:
> >> I have made some big progress in getting PyOpenSG updated to the OpenSG
> >> 2.0 trunk, but I have run up against problems related to class templates
> >> with static data members.
> >
> > [snip]
> >
> >> My hope is that this can be fixed
> >> with a GCC compiler option or something that is similarly non-invasive
> >> to the OpenSG code in question. Does anyone have any ideas or
> >> suggestions about how this can be resolved?
> >
> > Have you tried the python-c++ list? It's hard to think you're the first
> > one to encounter this.
> >
> > Just offer something: On Windows, you can tell the compiler that a
> > certain template instantiation is to be exported from a dynamic library.
> > I don't know if something similar is possible with GCC, but I've heard
> > rumours lately about explicit export and automatic hiding there.
>
> No, I hadn't asked there yet. I was just about to send them a message when I
> tried something that seems to resolve things in a fairly clean manner. If I
> modify the class declaration to be the following, things appear to be
> working for me:
>
> template<typename T>
> class C
> {
> public:
> // Leave initialization here.
> static const int static_member = 0;
> };
>
> // Add static data member definition statement;
> template<typename T> const int C<T>::static_member;
>
> If I hadn't been so focused on the full type instantiation, I might have
> tried this sooner. I am running a build right now to test this.
just a little curious, how do you handle this in general. None of the
FieldMask/FieldId elements has a definition so you actually can't take
the address of any of them, e.g
fprintf(stderr, "%p\n", &Transform::MatrixFieldMask);
fails as well.
So there must be something somewhere that solves this for regular
classes and before adding definitions to the templates part (as your
patch does) I would like to have a short look there.
kind regards
gerrit
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