dolfin team mailing list archive

[Johan Hake <hake@xxxxxxxxx>]

Hello!

Is it possible to store the internals of BoundaryConditions and its derived 
classes using shared_ptr?

This would be nice for the python interface where both Functions and 
FunctionSpaces are stored using shared_ptr.

As it is now will following break when the return bc is used.

   def create_Dirichlet_bc(value):
       # Define boundary condition in terms of a local variable u0
       # that goes out of scope when the execution of this function is done
       u0 = Constant(mesh, value)
       bc = DirichletBC(V, u0, DirichletBoundary())
       return bc

If DirichletBC could store the passed Function using shared_ptr we would avoid 
this problem. 

It should be straight forward to add shared_ptr constructor for both 
FunctionSpace and Function, as these are already defined as such in PyDOLFIN. 
However we should also consider doing the same for SubDomain. This will 
introduce a new class we need to wrap using shared_ptr in PyDOLFIN.

Johan