Re: [eigen] Forward declarations

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that's not so easy because I see that OpenQube headers typically
contains functions returning Eigen::Vector3d objects by value or
classes having Eigen's objects as members. That means the compiler has
to know what is, e.g., a Eigen::Vector3d so I'm afraid simple forward
declarations won't help.


On Mon, Jul 18, 2011 at 4:09 PM, David Lonie <loniedavid@xxxxxxxxx> wrote:
> Hi List,
> I'm currently integrating a library that uses Eigen vectors/matrices
> in its API into VTK, and I have a quick question: Is it possible to
> forward-declare Eigen::Matrix? The library (OpenQube
> currently includes Eigen/Core in
> it's headers, but I'd like to replace these includes with forward
> declarations so that I wouldn't have to add Eigen as a dependency for
> VTK.
> I've tried doing this myself, but it looks like the last three
> template arguments are dependent on compiler options. Is there a trick
> to forward declaring this class?
> Thanks,
> Dave

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