[Erikaaa]

Hi, Foamers!

I'm using openFoam v2106 to program a new C++ class.

In order to get access to cell centers. I set the variable [const Foam::fvMesh& B_mesh;] and use the function [const Foam::vectorField& meshCenters = B_mesh.cellCentres();].

in .H

const Foam::fvMesh& B_mesh;

in .C

const Foam::vectorField& meshCenters = mesh.cellCentres();

When I complie the new class alone, I get the following errors:

IBSystem.H:22:5: error: uninitialized reference member in ‘const class Foam::fvMesh&’ [-fpermissive]
   22 |     IBSystem()
      |     ^~~~~~~~
IBSystem.H:19:25: note: ‘const Foam::fvMesh& IBSystem::B_mesh’ should be initialized
   19 |     const Foam::fvMesh& B_mesh;
      |                         ^~~~~~

I don't know how to modify it. If someone can help me, I will be very grateful. Thank you!

[olesen]

Originally Posted by Erikaaa

Hi, Foamers!

I'm using openFoam v2106 to program a new C++ class.

In order to get access to cell centers. I set the variable [const Foam::fvMesh& B_mesh;] and use the function [const Foam::vectorField& meshCenters = B_mesh.cellCentres();].

in .H

const Foam::fvMesh& B_mesh;

in .C

const Foam::vectorField& meshCenters = mesh.cellCentres();

When I complie the new class alone, I get the following errors:

IBSystem.H:22:5: error: uninitialized reference member in ‘const class Foam::fvMesh&’ [-fpermissive]
   22 |     IBSystem()
      |     ^~~~~~~~
IBSystem.H:19:25: note: ‘const Foam::fvMesh& IBSystem::B_mesh’ should be initialized
   19 |     const Foam::fvMesh& B_mesh;
      |                         ^~~~~~

I don't know how to modify it. If someone can help me, I will be very grateful. Thank you!

If you have it as a reference, this is something that you will need to initialize when constructing your class, which means that you need to pass in a reference to the constructor.
Have you looked at any of the OpenFOAM source code? There are plenty of places using this type of thing.