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[Johan Hake <question103867@xxxxxxxxxxxxxxxxxxxxx>]

Question #103867 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/103867

Johan Hake proposed the following answer:
On Wednesday 10 March 2010 09:49:42 kent-and@xxxxxxxxx wrote:
> > New question #103867 on DOLFIN:
> > https://answers.launchpad.net/dolfin/+question/103867
> >
> > I have a mesh generator, written in C++, which I have now linked with
> > dolfin, using the MeshEditor class to construct
> > a mesh. This works, but I would like to be able to use it from python.
> > I have tried to use SWIG to create a module, but I don't know how to tell
> > it that my new class inherits Mesh.
> >
> > Here is a summary of my code... but maybe there is a better way to do
> > this?
> >
> > Chris
> >
> > mymesh.i
> > ========
> >
> >  %module mymesh
> >  %{
> >  /* Put header files here or function declarations like below */
> > #include "mymesh.h"
> >  %}
> >
> > /* mymesh.h */
> > namespace dolfin{
> >
> >   class Mymesh : public Mesh
> >   {
> >   public:
> >     Mymesh();
> >   };
> > }
> >
> > mymesh.cpp
> > ==========
> >
> > #include "mymesh.h"
> >
> > #include <dolfin/mesh/MeshPartitioning.h>
> > #include <dolfin/mesh/MeshEditor.h>
> > #include <dolfin.h>
> >
> > using namespace dolfin;
> > .....
> > Mymesh::Mymesh() {
> >  Mesheditor editor;
> > ....
> > }
> >
> >
> > # swig -c++ -python mymesh.i
> > mymesh.i:11: Warning(401): Nothing known about base class 'Mesh'.
> > Ignored.
> 
> Hake gave a more comprehensive answer, but here is a short one, to
> fix only this problem you need to include the path to Mesh on the command
> line, i.e.,
> 
> swig -c++ -python -I/path/to/Mesh mymesh.i
> 
> You will also need to include dolfin during linking.

Yes this is of course also true.

If you use:

  %include "dolfin/swig/import/mesh.i"

you only need to pass the include path to where dolfin is installed. Which 
also should be fine for the other include statements you have done above.


Johan

> Kent
> 
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